does 3.12.2 breaks UML with "con=xterm" ?

Today I realized that a UML cores if I use the xterm for the in/out.

I do usually use "con0=fd:0,fd:1 con=pts" to start a 32bit UML but because the xterm way was fine during the past few weeks (yes, I know, it was broken for a longer time before) and the only change yesterday was to upgrade from vanilla kernel 3.12.1 to 3.12.2 I'm wondering if there's a "suspicous" commit in that stable kernel which could be the reason ?

FWIW :
tfoerste@n22 ~ $ gdb --core=/mnt/ramdisk/core /home/tfoerste/devel/linux/linux -n -batch -ex bt [New LWP 29559]
Core was generated by `/home/tfoerste/devel/linux/linux earlyprintk ubda=/home/tfoerste/virtual/uml/tr'. Program terminated with signal 11, Segmentation fault.
#0 finish_task_switch (prev=0xffff9d2f, rq=<optimized out>) at kernel/sched/core.c:1993
1993 prev_state = prev->state;

#0  finish_task_switch (prev=0xffff9d2f, rq=<optimized out>) at kernel/sched/core.c:1993
#1  0x08427418 in context_switch (next=<optimized out>, prev=0x46d9eecc, rq=<optimized out>) at kernel/sched/core.c:2130
#2  __schedule () at kernel/sched/core.c:2568
#3  0x08427505 in schedule () at kernel/sched/core.c:2604
#4  0x0808b912 in sigsuspend (set=0x46d9eecc) at kernel/signal.c:3559
#5  0x080646d8 in winch_thread (arg=0x46d9eecc) at arch/um/drivers/chan_user.c:210
#6  0x083da38e in clone ()

MfG/Sincerely
Toralf Förster
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Pff - glibc was upgrade from 2.15-r3 to 2.16 too - /me hope, that it is not glibc.

MfG/Sincerely
Toralf Förster
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Please more details.
Does Linus' tree work?
Does it crash immediately?
...

Just booted an UML with xterm. Works fine...

Thanks,
//richard

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I do believe that it is the glibc 2.16 upgrade.

With 32 bit host kernel (3.12.1 and 3.12.2) and current tree of linus as guest kernel (tested older too:3.12, 3.11 ....) one of the linux processes crashes immediately using this start command :

/home/tfoerste/devel/linux/linux earlyprintk ubda=/home/tfoerste/virtual/uml/trinity ubdb=/mnt/ramdisk/trinity_swap eth0=tuntap,tap0,72:ef:3d:9f:c3:5a mem=1025M con=xterm umid=uml_trinity rootfstype=ext4

yes, but it is "just" one (or more ?) of the processes, all other processes continues, which gave later a lot of different error pictures/hangs when the UML image (stable 32 bit Gentoo linux) tries to start services during boot.

MfG/Sincerely
Toralf Förster
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Does this helps ? :

$ cat ~/devel/my/gdb_uml.config
set args earlyprintk ubda=/home/tfoerste/virtual/uml/trinity ubdb=/mnt/ramdisk/trinity_swap eth0=tuntap,tap0,72:ef:3d:9f:c3:5a mem=1025M con=xterm umid=uml_trinity rootfstype=ext4

set logging file /mnt/ramdisk/gdb_uml.log
set logging on

backtrace full
thread apply all backtrace

handle SIGSEGV nostop noprint
handle SIGUSR1 nopass stop print

$ gdb -x ~/devel/my/gdb_uml.config ~/devel/linux/linux
...
Reading symbols from /home/tfoerste/devel/linux/linux...done.
/home/tfoerste/devel/my/gdb_uml.config:6: Error in sourced command file:
No stack.
(gdb) run
Starting program: /home/tfoerste/devel/linux/linux earlyprintk ubda=/home/tfoerste/virtual/uml/trinity ubdb=/mnt/ramdisk/trinity_swap eth0=tuntap,tap0,72:ef:3d:9f:c3:5a mem=1025M con=xterm umid=uml_trinity rootfstype=ext4
Locating the bottom of the address space ...
Program received signal SIGSEGV, Segmentation fault.
page_ok (page=0) at arch/x86/um/os-Linux/task_size.c:32
32                      n = *address;
(gdb) quit

MfG/Sincerely
Toralf Förster
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Am Samstag, 30. November 2013, 17:28:55 schrieb Toralf Förster:

Please try Linus's tree and run it without GDB.
UML now has a complete new stack unwinder, let's give it a try.

Thanks,
//richard

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I tried it again now with host kernel 3.13-rc2 - (and guest kernel 3.11, 3.12 and 3.13-rc2) - same picture.

(FWIW I tried the UML guest already with a lot of versions inclusive latest Linus git tree, but for the host I'd like to run latest stable from Greg KH)

MfG/Sincerely
Toralf Förster
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Am Samstag, 30. November 2013, 18:26:45 schrieb Toralf Förster:

Please show me the backtrace from Linus' tree.

Thanks,
//richard

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3 subsequent runs gave these 3 back traces :

tfoerste@n22 /mnt/ramdisk $ cat bt-g
[New LWP 5297]
Core was generated by `/home/tfoerste/devel/linux/linux earlyprintk ubda=/home/tfoerste/virtual/uml/tr'. Program terminated with signal 11, Segmentation fault.
#0 constant_test_bit (addr=<optimized out>, nr=<optimized out>) at /home/tfoerste/devel/linux/arch/x86/include/asm/bitops.h:313
313 (addr[nr >> _BITOPS_LONG_SHIFT])) != 0;
#0 constant_test_bit (addr=<optimized out>, nr=<optimized out>) at /home/tfoerste/devel/linux/arch/x86/include/asm/bitops.h:313 No locals.
#1 test_ti_thread_flag (ti=<optimized out>, flag=<optimized out>) at include/linux/thread_info.h:93
No locals.
#2 test_tsk_thread_flag (flag=<optimized out>, tsk=<optimized out>) at include/linux/sched.h:2422
No locals.
#3 signal_pending (p=<optimized out>) at include/linux/sched.h:2448
No locals.
#4 __set_task_blocked (tsk=0x34747865, newset=0x49b41f4c) at kernel/signal.c:2530
No locals.
#5 0x0808a390 in __set_current_blocked (newset=0x49b41f4c) at kernel/signal.c:2558

        tsk = 0x34747865

#6 0x0808a3b7 in set_current_blocked (newset=0x0) at kernel/signal.c:2550 No locals.
#7 0x0808b8fd in sigsuspend (set=0x0) at kernel/signal.c:3556 No locals.
#8 0x080646d8 in winch_thread (arg=0x0) at arch/um/drivers/chan_user.c:210

        sigs = <incomplete type>
        pty_fd = 172431400
        pipe_fd = 15
        c = 1 '\001'

#9 0x083da38e in clone ()
No symbol table info available.

tfoerste@n22 /mnt/ramdisk $ cat bt-g
[New LWP 5557]
Core was generated by `/home/tfoerste/devel/linux/linux earlyprintk ubda=/home/tfoerste/virtual/uml/tr'. Program terminated with signal 11, Segmentation fault.
#0 0x0808b8da in sigsuspend (set=0x0) at kernel/signal.c:3555
3555 current->saved_sigmask = current->blocked;
#0 0x0808b8da in sigsuspend (set=0x0) at kernel/signal.c:3555
No locals.
#1 0x080646d8 in winch_thread (arg=0x0) at arch/um/drivers/chan_user.c:210

        sigs = <incomplete type>
        pty_fd = 145942568
        pipe_fd = 15
        c = 1 '\001'

#2 0x083da38e in clone ()
No symbol table info available.

tfoerste@n22 /mnt/ramdisk $ cat bt-g
[New LWP 5809]
Core was generated by `/home/tfoerste/devel/linux/linux earlyprintk ubda=/home/tfoerste/virtual/uml/tr'. Program terminated with signal 11, Segmentation fault.
#0 constant_test_bit (addr=<optimized out>, nr=<optimized out>) at /home/tfoerste/devel/linux/arch/x86/include/asm/bitops.h:313
313 (addr[nr >> _BITOPS_LONG_SHIFT])) != 0;
#0 constant_test_bit (addr=<optimized out>, nr=<optimized out>) at /home/tfoerste/devel/linux/arch/x86/include/asm/bitops.h:313 No locals.
#1 test_ti_thread_flag (ti=<optimized out>, flag=<optimized out>) at include/linux/thread_info.h:93
No locals.
#2 test_tsk_thread_flag (flag=<optimized out>, tsk=<optimized out>) at include/linux/sched.h:2422
No locals.
#3 signal_pending (p=<optimized out>) at include/linux/sched.h:2448
No locals.
#4 __set_task_blocked (tsk=0x34747865, newset=0x48b41f4c) at kernel/signal.c:2530
No locals.
#5 0x0808a390 in __set_current_blocked (newset=0x48b41f4c) at kernel/signal.c:2558

        tsk = 0x34747865

#6 0x0808a3b7 in set_current_blocked (newset=0x0) at kernel/signal.c:2550 No locals.
#7 0x0808b8fd in sigsuspend (set=0x0) at kernel/signal.c:3556 No locals.
#8 0x080646d8 in winch_thread (arg=0x0) at arch/um/drivers/chan_user.c:210

        sigs = <incomplete type>
        pty_fd = 152619048
        pipe_fd = 15
        c = 1 '\001'

#9 0x083da38e in clone ()
No symbol table info available.

MfG/Sincerely
Toralf Förster
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Am Samstag, 30. November 2013, 19:19:59 schrieb Toralf Förster:

Sorry for being imprecise, I meant the raw output from UML, not GDB. Currently it looks like yet another cluster fuck within the winch-Thread.

Thanks,
//richard

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ah - ok.

This is from the KOnsole starting the UML (FWIW the UML often starts,
but failed to get an IP address via DHCP and then suddenly all xterms vanishe w/o any further core dump)

tfoerste@n22 /mnt/ramdisk $ start_uml.sh -r ~/virtual/uml/trinity -y con=xterm -l /home/tfoerste/devel/linux/linux
+ /home/tfoerste/devel/linux/linux earlyprintk ubda=/home/tfoerste/virtual/uml/trinity ubdb=/mnt/ramdisk/trinity_swap eth0=tuntap,tap0,72:ef:3d:9f:c3:5a mem=1025M con=xterm umid=uml_trinity rootfstype=ext4 '' Locating the bottom of the address space ... 0x1000
Locating the top of the address space ... 0xc0000000
Core dump limits :
soft - NONE
hard - NONE
Checking that ptrace can change system call numbers...OK
Checking syscall emulation patch for ptrace...OK
Checking advanced syscall emulation patch for ptrace...OK
Checking for tmpfs mount on /dev/shm.../dev/shm...OK
Checking PROT_EXEC mmap in /dev/shm/...OK
Checking for the skas3 patch in the host:
- /proc/mm...not found: No such file or directory
- PTRACE_FAULTINFO...not found
- PTRACE_LDT...not found
UML running in SKAS0 mode
Adding 23449600 bytes to physical memory to account for exec-shield gap
bootconsole [earlycon0] enabled
PID hash table entries: 4096 (order: 2, 16384 bytes)
Dentry cache hash table entries: 262144 (order: 8, 1048576 bytes)
Inode-cache hash table entries: 131072 (order: 7, 524288 bytes)
Sorting __ex_table...
Memory: 1025168K/1072500K available (3932K kernel code, 283K rwdata, 1516K rodata, 114K init, 180K bss, 47332K reserved)
SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
NR_IRQS:15
Calibrating delay loop... 2832.79 BogoMIPS (lpj=14163968)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 512
Checking for host processor cmov support...Yes
Checking that host ptys support output SIGIO...Yes
Checking that host ptys support SIGIO on close...No, enabling workaround
devtmpfs: initialized
Using 2.6 host AIO
NET: Registered protocol family 16
bio: create slab <bio-0> at 0
Switched to clocksource itimer
NET: Registered protocol family 2
TCP established hash table entries: 16384 (order: 4, 65536 bytes)
TCP bind hash table entries: 16384 (order: 4, 65536 bytes)
TCP: Hash tables configured (established 16384 bind 16384)
TCP: reno registered
UDP hash table entries: 1024 (order: 2, 16384 bytes)
UDP-Lite hash table entries: 1024 (order: 2, 16384 bytes)
NET: Registered protocol family 1
RPC: Registered named UNIX socket transport module.
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
console [stderr0] disabled
mconsole (version 2) initialized on /home/tfoerste/.uml/uml_trinity/mconsole
Checking host MADV_REMOVE support...OK
UML Audio Relay (host dsp = /dev/sound/dsp, host mixer = /dev/sound/mixer)
Host TLS support detected
Detected host type: i386 (GDT indexes 6 to 9)
audit: initializing netlink socket (disabled)
type=2000 audit(1385836514.952:1): initialized
zbud: loaded
NFS: Registering the id_resolver key type
Key type id_resolver registered
Key type id_legacy registered
nfs4filelayout_init: NFSv4 File Layout Driver Registering...
Installing knfsd (copyright (C) 1996 [email protected]).
msgmni has been set to 2002
alg: No test for stdrng (krng)
Block layer SCSI generic (bsg) driver version 0.4 loaded (major 254)
io scheduler noop registered (default)
loop: module loaded
device-mapper: uevent: version 1.0.3
device-mapper: ioctl: 4.27.0-ioctl (2013-10-30) initialised: [email protected]
TCP: cubic registered
NET: Registered protocol family 10
sit: IPv6 over IPv4 tunneling driver
NET: Registered protocol family 17
Key type dns_resolver registered
Initialized stdio console driver
Console initialized on /dev/tty0
console [tty0] enabled
bootconsole [earlycon0] disabled

and it continues then with Gentoo's message in the xterm :

console [tty0] enabled
bootconsole [earlycon0] disabled
Initializing software serial port version 1
console [mc-1] enabled
ubda: unknown partition table
ubdb: unknown partition table
Netdevice 0 (72:ef:3d:9f:c3:5a) :
TUN/TAP backend -
EXT4-fs (ubda): INFO: recovery required on readonly filesystem EXT4-fs (ubda): write access will be enabled during recovery EXT4-fs (ubda): recovery complete
EXT4-fs (ubda): mounted filesystem with ordered data mode. Opts: (null)
VFS: Mounted root (ext4 filesystem) readonly on device 98:0.
devtmpfs: mounted
INIT: version 2.88 booting

OpenRC 0.12.4 is starting up Gentoo Linux (i686) [UML]

* Mounting /proc ... [ ok ]
* Mounting /run ...
* /run/openrc: creating directory
* /run/lock: creating directory
* /run/lock: correcting owner

 * Using /dev mounted from kernel ...                                                                                 [ ok ]
 * Mounting /dev/mqueue ...                                                                                           [ ok ]
 * Mounting /dev/pts ...                                                                                              [ ok ]
 * Mounting /dev/shm ...                                                                                              [ ok ]
 * Mounting /sys ...                                                                                                  [ ok ]
 * Mounting cgroup filesystem ...                                                                                     [ ok ]
 * setting up tmpfiles.d entries for /dev ...                                                                         [ ok ]
 * Starting udev ...                                                                                                  [ ok ]
 * Generating a rule to create a /dev/root symlink ...                                                                [ ok ]
 * Populating /dev with existing devices through uevents ...                                                          [ ok ]
 * Waiting for uevents to be processed ...                                                                            [ ok ]
 * Remounting root filesystem read/write ...                                                                          [ ok ]
 * Remounting filesystems ...                                                                                         [ ok ]
 * Updating /etc/mtab ...                                                                                             [ ok ]
 * Activating swap devices ...                                                                                        [ ok ]
 * Mounting local filesystems ...                                                                                     [ ok ]
 * Configuring kernel parameters ...                                                                                  [ ok ]
 * Creating user login records ...                                                                                    [ ok ]
 * Wiping /tmp directory ...                                                                                          [ ok ]
 * Setting up dm-crypt mappings ...
 *   crypt-swap using: -c aes -h sha1 -d /dev/urandom create crypt-swap /dev/ubdb ...                                 [ ok ]
 *     pre_mount: mkswap ${dev} ...                                                                                   [ ok ]
 * Setting hostname to trinity ...                                                                                    [ ok ]
 * Bringing up network interface lo ...                                                                               [ ok ]
 * Bringing up interface lo
 *   127.0.0.1/8 ...                                                                                                  [ ok ]
 *   Adding routes
 *     127.0.0.0/8 via 127.0.0.1 ...                                                                                  [ ok ]
 * Mounting misc binary format filesystem ...                                                                         [ ok ]
 * Loading custom binary format handlers ...                                                                          [ ok ]
 * Activating additional swap space ...                                                                               [ ok ]
 * setting up tmpfiles.d entries ...                                                                                  [ ok ]
 * Initializing random number generator ...                                                                           [ ok ]

INIT: Entering runlevel: 3
* Checking your configfile (/etc/syslog-ng/syslog-ng.conf) ... [ ok ]
* Starting syslog-ng ... [ ok ]
* Starting DHCP Client Daemon ...

 * Starting haveged ...                                                                                               [ ok ]
 * Starting rngd ...                                                                                                  [ ok ]
 * Starting sshd ...                                                                                                  [ ok ]
 * Starting vixie-cron ...                                                                                            [ ok ]

* Starting local
net.core.warnings = 0 [ ok ]

and syslog shows in another xterm :

Nov 30 19:38:28 trinity syslog-ng[1076]: syslog-ng starting up; version='3.4.2'
Nov 30 19:38:28 trinity kernel: Initializing cgroup subsys cpu
Nov 30 19:38:28 trinity kernel: Linux version 3.13.0-rc2 (tfoerste@n22) (gcc version 4.7.3 (Gentoo 4.7.3-r1 p1.3, pie-0.5.5) ) #1 Sat Nov 30 19:09:51 CET 2013
Nov 30 19:38:28 trinity kernel: On node 0 totalpages: 265364
Nov 30 19:38:28 trinity kernel: free_area_init_node: node 0, pgdat 085f8b00, node_mem_map 0a025000
Nov 30 19:38:28 trinity kernel: Normal zone: 2074 pages used for memmap
Nov 30 19:38:28 trinity kernel: Normal zone: 0 pages reserved
Nov 30 19:38:28 trinity kernel: Normal zone: 265364 pages, LIFO batch:31
Nov 30 19:38:28 trinity kernel: pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
Nov 30 19:38:28 trinity kernel: pcpu-alloc: [0] 0 
Nov 30 19:38:28 trinity kernel: Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 263290
Nov 30 19:38:29 trinity kernel: Kernel command line: earlyprintk ubda=/home/tfoerste/virtual/uml/trinity ubdb=/mnt/ramdisk/trinity_swap eth0=tuntap,tap0,72:ef:3d:9f:c3:5a mem=1025M con=xterm rootfstype=ext4  root=98:0
Nov 30 19:38:29 trinity kernel: bootconsole [earlycon0] enabled
Nov 30 19:38:29 trinity kernel: PID hash table entries: 4096 (order: 2, 16384 bytes)
Nov 30 19:38:29 trinity kernel: Dentry cache hash table entries: 262144 (order: 8, 1048576 bytes)
Nov 30 19:38:29 trinity kernel: Inode-cache hash table entries: 131072 (order: 7, 524288 bytes)
Nov 30 19:38:29 trinity kernel: Sorting __ex_table...
Nov 30 19:38:29 trinity kernel: Memory: 1025316K/1061456K available (3932K kernel code, 283K rwdata, 1516K rodata, 114K init, 180K bss, 36140K reserved)
Nov 30 19:38:29 trinity kernel: SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
Nov 30 19:38:29 trinity kernel: NR_IRQS:15
Nov 30 19:38:29 trinity kernel: Calibrating delay loop... 3822.38 BogoMIPS (lpj=19111936)
Nov 30 19:38:29 trinity kernel: pid_max: default: 32768 minimum: 301
Nov 30 19:38:29 trinity kernel: Mount-cache hash table entries: 512
Nov 30 19:38:29 trinity kernel: Checking for host processor cmov support...Yes
Nov 30 19:38:29 trinity kernel: Checking that host ptys support output SIGIO...Yes
Nov 30 19:38:29 trinity kernel: Checking that host ptys support SIGIO on close...No, enabling workaround
Nov 30 19:38:29 trinity kernel: devtmpfs: initialized
Nov 30 19:38:29 trinity kernel: Using 2.6 host AIO
Nov 30 19:38:29 trinity kernel: NET: Registered protocol family 16
Nov 30 19:38:29 trinity kernel: bio: create slab <bio-0> at 0
Nov 30 19:38:29 trinity kernel: Switched to clocksource itimer
Nov 30 19:38:29 trinity kernel: NET: Registered protocol family 2
Nov 30 19:38:29 trinity kernel: TCP established hash table entries: 16384 (order: 4, 65536 bytes)
Nov 30 19:38:29 trinity kernel: TCP bind hash table entries: 16384 (order: 4, 65536 bytes)
Nov 30 19:38:29 trinity kernel: TCP: Hash tables configured (established 16384 bind 16384)
Nov 30 19:38:29 trinity kernel: TCP: reno registered
Nov 30 19:38:29 trinity kernel: UDP hash table entries: 1024 (order: 2, 16384 bytes)
Nov 30 19:38:29 trinity kernel: UDP-Lite hash table entries: 1024 (order: 2, 16384 bytes)
Nov 30 19:38:29 trinity kernel: NET: Registered protocol family 1
Nov 30 19:38:29 trinity kernel: RPC: Registered named UNIX socket transport module.
Nov 30 19:38:29 trinity kernel: RPC: Registered udp transport module.
Nov 30 19:38:29 trinity kernel: RPC: Registered tcp transport module.
Nov 30 19:38:29 trinity kernel: RPC: Registered tcp NFSv4.1 backchannel transport module.
Nov 30 19:38:29 trinity kernel: console [stderr0] disabled
Nov 30 19:38:29 trinity kernel: mconsole (version 2) initialized on /home/tfoerste/.uml/uml_trinity/mconsole
Nov 30 19:38:29 trinity kernel: Checking host MADV_REMOVE support...OK
Nov 30 19:38:29 trinity kernel: UML Audio Relay (host dsp = /dev/sound/dsp, host mixer = /dev/sound/mixer)
Nov 30 19:38:29 trinity kernel: Host TLS support detected
Nov 30 19:38:29 trinity kernel: Detected host type: i386 (GDT indexes 6 to 9)
Nov 30 19:38:29 trinity kernel: audit: initializing netlink socket (disabled)
Nov 30 19:38:29 trinity kernel: type=2000 audit(1385836664.270:1): initialized
Nov 30 19:38:29 trinity kernel: zbud: loaded
Nov 30 19:38:29 trinity kernel: NFS: Registering the id_resolver key type
Nov 30 19:38:29 trinity kernel: Key type id_resolver registered
Nov 30 19:38:29 trinity kernel: Key type id_legacy registered
Nov 30 19:38:29 trinity kernel: nfs4filelayout_init: NFSv4 File Layout Driver Registering...
Nov 30 19:38:29 trinity kernel: Installing knfsd (copyright (C) 1996 [email protected]).
Nov 30 19:38:29 trinity kernel: msgmni has been set to 2002
Nov 30 19:38:29 trinity kernel: alg: No test for stdrng (krng)
Nov 30 19:38:29 trinity kernel: Block layer SCSI generic (bsg) driver version 0.4 loaded (major 254)
Nov 30 19:38:29 trinity kernel: io scheduler noop registered (default)
Nov 30 19:38:29 trinity kernel: loop: module loaded
Nov 30 19:38:29 trinity kernel: device-mapper: uevent: version 1.0.3
Nov 30 19:38:29 trinity kernel: device-mapper: ioctl: 4.27.0-ioctl (2013-10-30) initialised: [email protected]
Nov 30 19:38:29 trinity kernel: TCP: cubic registered
Nov 30 19:38:29 trinity kernel: NET: Registered protocol family 10
Nov 30 19:38:29 trinity kernel: sit: IPv6 over IPv4 tunneling driver
Nov 30 19:38:29 trinity kernel: NET: Registered protocol family 17
Nov 30 19:38:29 trinity kernel: Key type dns_resolver registered
Nov 30 19:38:29 trinity kernel: Initialized stdio console driver
Nov 30 19:38:29 trinity kernel: Console initialized on /dev/tty0
Nov 30 19:38:29 trinity kernel: console [tty0] enabled
Nov 30 19:38:29 trinity kernel: bootconsole [earlycon0] disabled
Nov 30 19:38:29 trinity kernel: Initializing software serial port version 1
Nov 30 19:38:29 trinity kernel: console [mc-1] enabled
Nov 30 19:38:29 trinity kernel: ubda: unknown partition table
Nov 30 19:38:29 trinity kernel: ubdb: unknown partition table
Nov 30 19:38:29 trinity kernel: Netdevice 0 (72:ef:3d:9f:c3:5a) : 
Nov 30 19:38:29 trinity kernel: TUN/TAP backend - 
Nov 30 19:38:29 trinity kernel: EXT4-fs (ubda): INFO: recovery required on readonly filesystem
Nov 30 19:38:29 trinity kernel: EXT4-fs (ubda): write access will be enabled during recovery
Nov 30 19:38:29 trinity kernel: EXT4-fs (ubda): recovery complete
Nov 30 19:38:29 trinity kernel: EXT4-fs (ubda): mounted filesystem with ordered data mode. Opts: (null)
Nov 30 19:38:29 trinity kernel: VFS: Mounted root (ext4 filesystem) readonly on device 98:0.
Nov 30 19:38:29 trinity kernel: devtmpfs: mounted
Nov 30 19:38:29 trinity kernel[536]: starting version 204
Nov 30 19:38:29 trinity kernel: random: nonblocking pool is initialized
Nov 30 19:38:29 trinity kernel: EXT4-fs (ubda): re-mounted. Opts: (null)
Nov 30 19:38:29 trinity kernel: bio: create slab <bio-1> at 1
Nov 30 19:38:29 trinity kernel: Adding 262140k swap on /dev/mapper/crypt-swap.  Priority:-1 extents:1 across:262140k FS
Nov 30 19:38:29 trinity kernel: type=1006 audit(1385836708.020:2): pid=1074 uid=0 old auid=4294967295 new auid=0 old ses=4294967295 new ses=1 res=1
Nov 30 19:38:29 trinity dhcpcd[1098]: version 5.6.4 starting
Nov 30 19:38:30 trinity dhcpcd[1098]: sit0: unsupported interface type 308, falling back to ethernet
Nov 30 19:38:31 trinity dhcpcd[1098]: sit0: broadcasting for a lease
Nov 30 19:38:31 trinity dhcpcd[1098]: eth0: sending IPv6 Router Solicitation
Nov 30 19:38:31 trinity dhcpcd[1098]: eth0: checking for 169.254.229.237
Nov 30 19:38:35 trinity dhcpcd[1098]: eth0: sending IPv6 Router Solicitation
Nov 30 19:38:36 trinity dhcpcd[1098]: eth0: using IPv4LL address 169.254.229.237
Nov 30 19:38:37 trinity dhcpcd[1098]: forked to background, child pid 1138
Nov 30 19:38:38 trinity haveged: haveged starting up
Nov 30 19:38:39 trinity haveged: haveged: ver: 1.7a; arch: x86; vend: GenuineIntel; opts: (T); collect: 128K
Nov 30 19:38:39 trinity haveged: haveged: cpu: (L4 VC); data: 32K (L4); inst: 32K (L4); idx: 18/40; sz: 32190/69480
Nov 30 19:38:39 trinity haveged: haveged: tot tests: BA8: A:1/0 B: 1/0; continuous tests: B: A:0/0 B: 0/0; last entropy estimate 7.99992
Nov 30 19:38:39 trinity haveged: haveged: fills: 0, generated: 0 
Nov 30 19:38:39 trinity dhcpcd[1138]: eth0: sending IPv6 Router Solicitation
Nov 30 19:38:41 trinity dhcpcd[1138]: eth0: broadcasting for a lease
Nov 30 19:38:44 trinity dhcpcd[1138]: eth0: sending IPv6 Router Solicitation
Nov 30 19:38:44 trinity dhcpcd[1138]: eth0: no IPv6 Routers available
Nov 30 19:38:45 trinity cron[1228]: (CRON) STARTUP (V5.0)
Nov 30 19:38:45 trinity kernel: [sched_delayed] sched: RT throttling activated
Nov 30 19:40:01 trinity cron[1257]: (root) CMD (test -x /usr/sbin/run-crons && /usr/sbin/run-crons)

after another minute now all xterms are away ....

MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3

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Am Samstag, 30. November 2013, 19:43:47 schrieb Toralf Förster:

So, it does not crash immediately.
Please do not use xterm for con0. Such that we can see the kernel output after a crash.
Maybe there are some error message before...

Thanks,
//richard

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Right, to be precise, just 1 sub-process crashes immediately

Without xterm I do not see any errors except the "winch_thread ..." - line.

BTW wrt the radix-tree-issue seems that fedora has now a similar bug open : https://bugzilla.redhat.com/show_bug.cgi?id=1015028

MfG/Sincerely
Toralf Förster
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Am Sonntag, 1. Dezember 2013, 11:17:31 schrieb Toralf Förster:

I meant xterm for all consoles but con0...
Such that you can trigger the crash but are still able to see the output.

Thanks for the info!

Thanks,
//richard

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Still trying to get info, no luck till now.

And these syslog messages from the 32bit uml guest (3.12-rc2-g...) are just a fallout from a cored process IMO:

Dec  1 17:59:30 trinity kernel: =============================================================================
Dec  1 17:59:30 trinity kernel: BUG kmalloc-64 (Not tainted): Poison overwritten
Dec  1 17:59:30 trinity kernel: -----------------------------------------------------------------------------
Dec  1 17:59:30 trinity kernel:
Dec  1 17:59:30 trinity kernel: Disabling lock debugging due to kernel taint
Dec  1 17:59:30 trinity kernel: INFO: 0x48b59da5-0x48b59dac. First byte 0xff instead of 0x6b
Dec  1 17:59:30 trinity kernel: INFO: Allocated in ext4_htree_store_dirent+0x2e/0x120 age=817 cpu=0 pid=1076
Dec  1 17:59:30 trinity kernel: INFO: Freed in free_rb_tree_fname+0x3b/0xa0 age=817 cpu=0 pid=1076
Dec  1 17:59:30 trinity kernel: INFO: Slab 0x0a83f220 objects=36 used=36 fp=0x  (null) flags=0x0080
Dec  1 17:59:30 trinity kernel: INFO: Object 0x48b59d90 @offset=3472 fp=0x48b59620
Dec  1 17:59:30 trinity kernel:
Dec  1 17:59:30 trinity kernel: Bytes b4 48b59d80: cc 03 00 00 07 98 ff ff 5a 5a 5a 5a 5a 5a 5a 5a  ........ZZZZZZZZ
Dec  1 17:59:30 trinity kernel: Object 48b59d90: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
Dec  1 17:59:30 trinity kernel: Object 48b59da0: 6b 6b 6b 6b 6b ff fe fb 77 fe ff ff ff 6b 6b 6b  kkkkk...w....kkk
Dec  1 17:59:30 trinity kernel: Object 48b59db0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
Dec  1 17:59:30 trinity kernel: Object 48b59dc0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b a5  kkkkkkkkkkkkkkk.
Dec  1 17:59:30 trinity kernel: Redzone 48b59dd0: bb bb bb bb                                      ....
Dec  1 17:59:30 trinity kernel: Padding 48b59df8: 5a 5a 5a 5a 5a 5a 5a 5a                          ZZZZZZZZ
Dec  1 17:59:30 trinity kernel: CPU: 0 PID: 1147 Comm: haveged Tainted: G    B        3.13.0-rc2-00001-gaf91706 #3
Dec  1 17:59:30 trinity kernel: Stack:
Dec  1 17:59:30 trinity kernel: 084bf793 084bf793 481e7b70 00000004 085d0547 48849d80 48b59d90 0a83f220
Dec  1 17:59:30 trinity kernel: 481e7b80 084247eb 00000000 00000000 481e7bb0 080fbed8 084d0168 48b59d90
Dec  1 17:59:30 trinity kernel: 00000d90 48b59620 00000000 00000080 48b59000 48b59da5 0a83f220 48849d80
Dec  1 17:59:30 trinity kernel: Call Trace:
Dec  1 17:59:30 trinity kernel: [<084247eb>] dump_stack+0x26/0x28
Dec  1 17:59:30 trinity kernel: [<080fbed8>] print_trailer+0x118/0x120
Dec  1 17:59:30 trinity kernel: [<080fc292>] check_bytes_and_report+0xb2/0x110
Dec  1 17:59:30 trinity kernel: [<080fc40d>] check_object+0x11d/0x220
Dec  1 17:59:30 trinity kernel: [<080fd0c9>] ? check_slab+0xb9/0xd0
Dec  1 17:59:30 trinity kernel: [<084231f9>] alloc_debug_processing+0x130/0x141
Dec  1 17:59:30 trinity kernel: [<08423705>] __slab_alloc.constprop.75+0x305/0x319
Dec  1 17:59:30 trinity kernel: [<081800de>] ? ext4_htree_store_dirent+0x2e/0x120
Dec  1 17:59:30 trinity kernel: [<081800de>] ? ext4_htree_store_dirent+0x2e/0x120
Dec  1 17:59:30 trinity kernel: [<080fdaeb>] __kmalloc+0x7b/0x140
Dec  1 17:59:30 trinity kernel: [<0819b350>] ? str2hashbuf_signed+0x0/0xb0
Dec  1 17:59:30 trinity kernel: [<081800de>] ? ext4_htree_store_dirent+0x2e/0x120
Dec  1 17:59:30 trinity kernel: [<081800de>] ext4_htree_store_dirent+0x2e/0x120
Dec  1 17:59:30 trinity kernel: [<0818f420>] htree_dirblock_to_tree+0x110/0x160
Dec  1 17:59:30 trinity kernel: [<0818fc30>] ext4_htree_fill_tree+0xd0/0x270
Dec  1 17:59:30 trinity kernel: [<08423397>] ? free_debug_processing+0x18d/0x1f6
Dec  1 17:59:30 trinity kernel: [<0810c6d1>] ? final_putname+0x41/0x50
Dec  1 17:59:30 trinity kernel: [<0817f835>] ? ext4_readdir+0x55/0x890
Dec  1 17:59:30 trinity kernel: [<084238a7>] ? __slab_free+0x18e/0x1f9
Dec  1 17:59:30 trinity kernel: [<0817f9ac>] ext4_readdir+0x1cc/0x890
Dec  1 17:59:30 trinity kernel: [<08110e7c>] ? do_filp_open+0x2c/0x80
Dec  1 17:59:30 trinity kernel: [<080fda08>] ? kmem_cache_free+0xd8/0x110
Dec  1 17:59:30 trinity kernel: [<0810c6d1>] ? final_putname+0x41/0x50
Dec  1 17:59:30 trinity kernel: [<0810c6d1>] ? final_putname+0x41/0x50
Dec  1 17:59:30 trinity kernel: [<08115285>] iterate_dir+0x55/0xb0
Dec  1 17:59:30 trinity kernel: [<0811541f>] SyS_getdents+0xaf/0x150
Dec  1 17:59:30 trinity kernel: [<08114f30>] ? filldir+0x0/0x190
Dec  1 17:59:30 trinity kernel: [<080693b0>] ? mconsole_halt+0x20/0x30
Dec  1 17:59:30 trinity kernel: [<080693b0>] ? mconsole_halt+0x20/0x30
Dec  1 17:59:30 trinity kernel: [<08062a94>] handle_syscall+0x64/0x80
Dec  1 17:59:30 trinity kernel: [<080693b0>] ? mconsole_halt+0x20/0x30
Dec  1 17:59:30 trinity kernel: [<08069398>] ? mconsole_halt+0x8/0x30
Dec  1 17:59:30 trinity kernel: [<080693b0>] ? mconsole_halt+0x20/0x30
Dec  1 17:59:30 trinity kernel: [<083d70c1>] ? ptrace+0x31/0x80
Dec  1 17:59:30 trinity kernel: [<08079fb2>] ? get_fp_registers+0x22/0x40
Dec  1 17:59:30 trinity kernel: [<08075085>] userspace+0x475/0x5f0
Dec  1 17:59:30 trinity kernel: [<083d70c1>] ? ptrace+0x31/0x80
Dec  1 17:59:30 trinity kernel: [<0807a516>] ? os_set_thread_area+0x26/0x40
Dec  1 17:59:30 trinity kernel: [<08079510>] ? do_set_thread_area+0x20/0x50
Dec  1 17:59:30 trinity kernel: [<08079688>] ? arch_switch_tls+0xb8/0x100
Dec  1 17:59:30 trinity kernel: [<0805f750>] fork_handler+0x60/0x70
Dec  1 17:59:30 trinity kernel:
Dec  1 17:59:30 trinity kernel: FIX kmalloc-64: Restoring 0x48b59da5-0x48b59dac=0x6b
Dec  1 17:59:30 trinity kernel:
Dec  1 17:59:30 trinity kernel: FIX kmalloc-64: Marking all objects used

MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3

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Not sure if the 2 attached files contains useful info, but here they are:

The back trace of a hanging linux process :
$>sudo gdb /home/tfoerste/devel/linux/linux 27162 -n -batch -ex 'bt full' > bt

and stdout, error and bt of the core file from round #18 of this command :

$> I=0; while [[ : ]]; do ((I=I+1)); echo; echo; echo $I; date; for i in trinity.sh xterm linux port-helper start_uml.sh ; do pkill $i; done; rm -f /mnt/ramdisk/core; start_uml.sh -r ~/virtual/uml/trinity -l /home/tfoerste/devel/linux/linux -y 'con0=fd:0,fd:1 con=xterm' 1>/mnt/ramdisk/$I.out 2>/mnt/ramdisk/$I.err; [[ -f /mnt/ramdisk/core ]] && gdb --core=/mnt/ramdisk/core /home/tfoerste/devel/linux/linux -n -batch -ex 'bt full' > /mnt/ramdisk/$I.bt; sleep 10; done

MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3

Checking that ptrace can change system call numbers...OK Checking syscall emulation patch for ptrace...OK Checking advanced syscall emulation patch for ptrace...OK Checking for the skas3 patch in the host:
- /proc/mm...not found: No such file or directory
- PTRACE_FAULTINFO...not found
- PTRACE_LDT...not found
reset: standard error: Inappropriate ioctl for device

Locating the bottom of the address space ... 0x1000
Locating the top of the address space ... 0xc0000000
Core dump limits :
soft - NONE
hard - NONE
0xc0000000
Core dump limits :
soft - NONE
hard - NONE
0xc0000000
Core dump limits :
soft - NONE
hard - NONE
0xc0000000
Core dump limits :
soft - NONE
hard - NONE
Checking for tmpfs mount on /dev/shm.../dev/shm...OK Checking PROT_EXEC mmap in /dev/shm/...OK
OK
OK
OK
UML running in SKAS0 mode
console [tty0] enabled
bootconsole [earlycon0] disabled
Initializing software serial port version 1
console [mc-1] enabled
ubda: unknown partition table
ubdb: unknown partition table
Netdevice 0 (72:ef:3d:9f:c3:5a) :
TUN/TAP backend -
EXT4-fs (ubda): mounted filesystem with ordered data mode. Opts: (null)
VFS: Mounted root (ext4 filesystem) readonly on device 98:0.
devtmpfs: mounted
INIT: version 2.88 booting

OpenRC 0.12.4 is starting up Gentoo Linux (i686) [UML]

* Mounting /proc ...
 [ ok ]
* Mounting /run ...
* /run/openrc: creating directory
* /run/lock: creating directory
* /run/lock: correcting owner
* Using /dev mounted from kernel ...
 [ ok ]
* Mounting /dev/mqueue ...
 [ ok ]
* Mounting /dev/pts ...
 [ ok ]
* Mounting /dev/shm ...
 [ ok ]
* Mounting /sys ...
 [ ok ]
* Mounting cgroup filesystem ...
 [ ok ]
* setting up tmpfiles.d entries for /dev ...
 [ ok ]
* Starting udev ...
 [ ok ]
* Generating a rule to create a /dev/root symlink ...
 [ ok ]
* Populating /dev with existing devices through uevents ...
 [ ok ]
* Waiting for uevents to be processed ...
 [ ok ]
* Remounting root filesystem read/write ...
 [ ok ]
* Remounting filesystems ...
 [ ok ]
* Updating /etc/mtab ...
 [ ok ]
* Activating swap devices ...
 [ ok ]
* Mounting local filesystems ...
 [ ok ]
* Configuring kernel parameters ...
 [ ok ]
* Creating user login records ...
 [ ok ]
* Wiping /tmp directory ...
 [ ok ]
* Setting up dm-crypt mappings ...
* crypt-swap using: -c aes -h sha1 -d /dev/urandom create crypt-swap /dev/ubdb ...
 [ ok ]
* pre_mount: mkswap ${dev} ...
 [ ok ]
 [ ok ]
* Setting hostname to trinity ...
 [ ok ]
* Bringing up network interface lo ...
 [ ok ]
* Bringing up interface lo
* 127.0.0.1/8 ...
 [ ok ]
* Adding routes
* 127.0.0.0/8 via 127.0.0.1 ...
 [ ok ]
* Mounting misc binary format filesystem ...
 [ ok ]
* Loading custom binary format handlers ...
 [ ok ]
* Activating additional swap space ...
 [ ok ]
* setting up tmpfiles.d entries ...
 [ ok ]
* Initializing random number generator ...
 [ ok ]
INIT: Entering runlevel: 3
* Checking your configfile (/etc/syslog-ng/syslog-ng.conf) ...
 [ ok ]
* Starting syslog-ng ...
 [ ok ]
* Starting DHCP Client Daemon ...
 [ ok ]
* Starting haveged ...
 [ ok ]
* Starting rngd ...
 [ ok ]
* Starting sshd ...
 [ ok ]
* Starting vixie-cron ...
 [ ok ]
* Starting local
net.core.warnings = 0
 [ ok ]

Kernel panic - not syncing: do_syscall_stub : PTRACE_SETREGS failed, errno = 3

CPU: 0 PID: 1265 Comm: rmdir Tainted: G        W    3.13.0-rc2-00001-gaf91706 #3
Stack:
 084bf793 084bf793 46d47bb8 00000004 085d0547 00006f91 00000003 00000011
 46d47bc8 084247eb 00000000 00000000 46d47bf0 08421c50 084cb200 08607720
 084c8084 46d47c00 00000000 00006f91 00000003 00000011 46d47c24 08073d55
Call Trace:
 [<08073d55>] ? run_syscall_stub+0x125/0x2c0
 [<084247eb>] dump_stack+0x26/0x28
 [<08421c50>] panic+0x7a/0x180
 [<08073d55>] run_syscall_stub+0x125/0x2c0
 [<080cba88>] ? unlock_page+0x28/0x30
 [<0807429f>] map+0xff/0x110
 [<080616ff>] flush_tlb_page+0xef/0x1d0
 [<08061db1>] handle_page_fault+0x241/0x290
 [<08062c9e>] do_op_one_page+0x5e/0x1a0
 [<08071dfe>] ? set_signals+0x1e/0x40
 [<080a3e71>] ? up_write+0x11/0x20
 [<08062e19>] buffer_op+0x39/0xf0
 [<08062af0>] ? clear_chunk+0x0/0x30
 [<08063169>] clear_user+0x69/0x90
 [<08062af0>] ? clear_chunk+0x0/0x30
 [<080df00e>] ? vm_mmap+0x4e/0x60
 [<08149f73>] padzero+0x23/0x40
 [<0814bec9>] load_elf_binary+0xad9/0xe60
 [<08052304>] ? init_zswap+0xa1/0x21e
 [<08052160>] ? __alloc_bootmem_node_high+0x1d/0x28
 [<08051f14>] ? __alloc_bootmem_nopanic+0x1/0x2c
 [<080509f4>] ? pcpu_setup_first_chunk+0x527/0x834
 [<08109bd5>] search_binary_handler+0x35/0x90
 [<0810a055>] do_execve+0x425/0x680
 [<081035a0>] ? default_llseek+0x70/0x150
 [<08103788>] ? SyS_llseek+0x18/0xd0
 [<0810a5b2>] SyS_execve+0x42/0x60
 [<081035a0>] ? default_llseek+0x70/0x150
 [<08103788>] ? SyS_llseek+0x18/0xd0
 [<081035d8>] ? default_llseek+0xa8/0x150
 [<08062a94>] handle_syscall+0x64/0x80
 [<081034a0>] ? generic_file_llseek+0x40/0x60
 [<081035a0>] ? default_llseek+0x70/0x150
 [<08103788>] ? SyS_llseek+0x18/0xd0
 [<081035a0>] ? default_llseek+0x70/0x150
 [<081035d8>] ? default_llseek+0xa8/0x150
 [<083d70c1>] ? ptrace+0x31/0x80
 [<08079fb2>] ? get_fp_registers+0x22/0x40
 [<08075085>] userspace+0x475/0x5f0
 [<083d70c1>] ? ptrace+0x31/0x80
 [<0807a516>] ? os_set_thread_area+0x26/0x40
 [<08079510>] ? do_set_thread_area+0x20/0x50
 [<08079688>] ? arch_switch_tls+0xb8/0x100
 [<0805f750>] fork_handler+0x60/0x70

bootconsole [earlycon0] enabled
PID hash table entries: 4096 (order: 2, 16384 bytes)
Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
Sorting __ex_table...
Memory: 1025336K/1049600K available (3928K kernel code, 287K rwdata, 1516K rodata, 114K init, 180K bss, 24264K reserved)
SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
NR_IRQS:15
Calibrating delay loop... 3623.32 BogoMIPS (lpj=18116608)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 512
Checking for host processor cmov support...Yes
Checking that host ptys support output SIGIO...Yes
Checking that host ptys support SIGIO on close...No, enabling workaround
devtmpfs: initialized
Using 2.6 host AIO
NET: Registered protocol family 16
bio: create slab <bio-0> at 0
Switched to clocksource itimer
NET: Registered protocol family 2
TCP established hash table entries: 8192 (order: 3, 32768 bytes)
TCP bind hash table entries: 8192 (order: 3, 32768 bytes)
TCP: Hash tables configured (established 8192 bind 8192)
TCP: reno registered
UDP hash table entries: 512 (order: 1, 8192 bytes)
UDP-Lite hash table entries: 512 (order: 1, 8192 bytes)
NET: Registered protocol family 1
RPC: Registered named UNIX socket transport module.
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
console [stderr0] disabled
mconsole (version 2) initialized on /home/tfoerste/.uml/uml_trinity/mconsole
Checking host MADV_REMOVE support...OK
UML Audio Relay (host dsp = /dev/sound/dsp, host mixer = /dev/sound/mixer)
Host TLS support detected
Detected host type: i386 (GDT indexes 6 to 9)
audit: initializing netlink socket (disabled)
type=2000 audit(1385922975.237:1): initialized
zbud: loaded
NFS: Registering the id_resolver key type
Key type id_resolver registered
Key type id_legacy registered
nfs4filelayout_init: NFSv4 File Layout Driver Registering...
Installing knfsd (copyright (C) 1996 [email protected]).
msgmni has been set to 2002
alg: No test for stdrng (krng)
Block layer SCSI generic (bsg) driver version 0.4 loaded (major 254)
io scheduler noop registered (default)
loop: module loaded
device-mapper: uevent: version 1.0.3
device-mapper: ioctl: 4.27.0-ioctl (2013-10-30) initialised: [email protected]
TCP: cubic registered
NET: Registered protocol family 10
sit: IPv6 over IPv4 tunneling driver
NET: Registered protocol family 17
Key type dns_resolver registered
Initialized stdio console driver
Console initialized on /dev/tty0
console [tty0] enabled
bootconsole [earlycon0] disabled
bootconsole [earlycon0] enabled
PID hash table entries: 4096 (order: 2, 16384 bytes)
Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
Sorting __ex_table...
Memory: 1025336K/1049600K available (3928K kernel code, 287K rwdata, 1516K rodata, 114K init, 180K bss, 24264K reserved)
SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
NR_IRQS:15
Calibrating delay loop... 3623.32 BogoMIPS (lpj=18116608)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 512
Checking for host processor cmov support...Yes
Checking that host ptys support output SIGIO...Yes
Checking that host ptys support SIGIO on close...No, enabling workaround
devtmpfs: initialized
Using 2.6 host AIO
NET: Registered protocol family 16
bio: create slab <bio-0> at 0
Switched to clocksource itimer
NET: Registered protocol family 2
TCP established hash table entries: 8192 (order: 3, 32768 bytes)
TCP bind hash table entries: 8192 (order: 3, 32768 bytes)
TCP: Hash tables configured (established 8192 bind 8192)
TCP: reno registered
UDP hash table entries: 512 (order: 1, 8192 bytes)
UDP-Lite hash table entries: 512 (order: 1, 8192 bytes)
NET: Registered protocol family 1
RPC: Registered named UNIX socket transport module.
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
console [stderr0] disabled
mconsole (version 2) initialized on /home/tfoerste/.uml/uml_trinity/mconsole
Checking host MADV_REMOVE support...OK
UML Audio Relay (host dsp = /dev/sound/dsp, host mixer = /dev/sound/mixer)
Host TLS support detected
Detected host type: i386 (GDT indexes 6 to 9)
audit: initializing netlink socket (disabled)
type=2000 audit(1385922975.237:1): initialized
zbud: loaded
NFS: Registering the id_resolver key type
Key type id_resolver registered
Key type id_legacy registered
nfs4filelayout_init: NFSv4 File Layout Driver Registering...
Installing knfsd (copyright (C) 1996 [email protected]).
msgmni has been set to 2002
alg: No test for stdrng (krng)
Block layer SCSI generic (bsg) driver version 0.4 loaded (major 254)
io scheduler noop registered (default)
loop: module loaded
device-mapper: uevent: version 1.0.3
device-mapper: ioctl: 4.27.0-ioctl (2013-10-30) initialised: [email protected]
TCP: cubic registered
NET: Registered protocol family 10
sit: IPv6 over IPv4 tunneling driver
NET: Registered protocol family 17
Key type dns_resolver registered
Initialized stdio console driver
Console initialized on /dev/tty0
console [tty0] enabled
bootconsole [earlycon0] disabled

0x080a1026 in entity_before (a=<optimized out>, b=<optimized out>) at kernel/sched/fair.c:473
473 return (s64)(a->vruntime - b->vruntime) < 0;
#0 0x080a1026 in entity_before (a=<optimized out>, b=<optimized out>) at kernel/sched/fair.c:473
No locals.
#1 __enqueue_entity (cfs_rq=0x85d8f00 <runqueues+64>, se=0x47f23cf0) at kernel/sched/fair.c:522
link = 0xb5654413
leftmost = 0
#2 0x080a1b3c in enqueue_entity (flags=<optimized out>, se=<optimized out>, cfs_rq=<optimized out>) at kernel/sched/fair.c:2584 No locals.
#3 enqueue_task_fair (rq=0x85d8ec0 <runqueues>, p=0x85d8f00 <runqueues+64>, flags=0) at kernel/sched/fair.c:3689

        se = 0x47f23cf0

#4 0x0809dd7e in enqueue_task (rq=0x85d8ec0 <runqueues>, p=0x47e66400, flags=1) at kernel/sched/core.c:767
No locals.
#5 0x0809de35 in activate_task (rq=0x85d8f00 <runqueues+64>, p=0x47f23cf0, flags=1) at kernel/sched/core.c:782
No locals.
#6 0x0809df8b in ttwu_activate (p=<optimized out>, rq=<optimized out>, en_flags=<optimized out>) at kernel/sched/core.c:1561 No locals.
#7 ttwu_do_activate (p=<optimized out>, rq=<optimized out>, wake_flags=<optimized out>) at kernel/sched/core.c:1450 No locals.
#8 ttwu_queue (p=<optimized out>, cpu=<optimized out>) at kernel/sched/core.c:1562
No locals.
#9 try_to_wake_up (p=0x47e66400, state=1, wake_flags=0) at kernel/sched/core.c:1629
success = 1
#10 0x0809e054 in default_wake_function (curr=0x85d8f00 <runqueues+64>, mode=1, wake_flags=0, key=0x0) at kernel/sched/core.c:2701 No locals.
#11 0x0811583e in __pollwake (key=<optimized out>, sync=<optimized out>, mode=<optimized out>, wait=<optimized out>) at fs/select.c:205
pwq = 0x85d8f00 <runqueues+64>
dummy_wait = <incomplete type>
#12 pollwake (wait=0xb5654413, mode=140349184, sync=140349184, key=0x47f23cf0) at fs/select.c:215
No locals.
#13 0x080a2c24 in __wake_up_common (q=0x85efebc <random_read_wait>, mode=1, nr_exclusive=1, wake_flags=0, key=0x0) at kernel/sched/wait.c:72
flags = 0
curr = 0x85d8f00 <runqueues+64>
#14 0x080a2e8f in __wake_up (q=0x85efebc <random_read_wait>, mode=1, nr_exclusive=1, key=0x85d8f00 <runqueues+64>) at kernel/sched/wait.c:94 No locals.
#15 0x082b8cad in credit_entropy_bits (r=0x85efde0 <input_pool>, nbits=5) at drivers/char/random.c:673

        entropy_bytes = 2399
        orig = 2399
        pool_size = 140443104
        nfrac = 40

#16 0x082b9035 in add_timer_randomness (state=0x0, num=1207057648) at drivers/char/random.c:815
r = 0x85efde0 <input_pool>
sample = <incomplete type>
#17 0x082b99f5 in add_disk_randomness (disk=0x47f23cf0) at drivers/char/random.c:887
No locals.
#18 0x08285a23 in blk_update_bidi_request (rq=0x47f21528, error=0, nr_bytes=3043312659, bidi_bytes=1207057648) at block/blk-core.c:2450 No locals.
#19 0x08285a50 in blk_end_bidi_request (rq=0x47f21528, error=0, nr_bytes=3043312659, bidi_bytes=140349184) at block/blk-core.c:2528 No locals.
#20 0x08285b2b in blk_end_request (rq=0x47f21528, error=0, nr_bytes=4096) at block/blk-core.c:2580
No locals.
#21 0x0806a52c in ubd_handler () at arch/um/drivers/ubd_kern.c:466

        req = 0x46e1df30
        n = 140349184

#22 ubd_intr (irq=4, dev=0x85d19e0 <ubd_devs>) at arch/um/drivers/ubd_kern.c:482
No locals.
#23 0x080a8f6f in handle_irq_event_percpu (desc=0x85d9a60 <irq_desc+480>, action=0x47cff380) at kernel/irq/handle.c:142
res = (unknown: 140310620)
retval = IRQ_NONE
flags = 0
irq = 4
#24 0x080a90b7 in handle_irq_event (desc=0x85d9a60 <irq_desc+480>) at kernel/irq/handle.c:191

        action = 0x85d8f00 <runqueues+64>
        ret = (unknown: 140349184)

#25 0x080ab410 in handle_edge_irq (irq=4, desc=0x85d9a60 <irq_desc+480>) at kernel/irq/chip.c:547 No locals.
#26 0x080a8908 in generic_handle_irq_desc (desc=<optimized out>, irq=<optimized out>) at include/linux/irqdesc.h:112 No locals.
#27 generic_handle_irq (irq=1207057648) at kernel/irq/irqdesc.c:314

        desc = 0xb5654413
#28 0x0805eda5 in do_IRQ (irq=140349184, regs=0x85d8f00 <runqueues+64>) at arch/um/kernel/irq.c:294
        old_regs = 0x0
#29 0x0805ee25 in sigio_handler (sig=29, unused_si=0x85cfb0c <cpu0_irqstack+31500>, regs=0x85cf85c <cpu0_irqstack+30812>) at arch/um/kernel/irq.c:53
        irq_fd = 0x47d0c000
        n = 140349184

#30 0x08071d5e in sig_handler_common (sig=29, si=0x85cfb0c <cpu0_irqstack+31500>, mc=0xb5654413) at arch/um/os-Linux/signal.c:44
r = <incomplete type>
save_errno = 0
#31 0x08071e9d in sig_handler (sig=140349184, si=0x85cfb0c <cpu0_irqstack+31500>, mc=0x85cfba0 <cpu0_irqstack+31648>) at arch/um/os-Linux/signal.c:231
enabled = 1
#32 0x08071a0b in hard_handler (sig=-1251654637, si=0x85cfb0c <cpu0_irqstack+31500>, p=0x85cfb8c <cpu0_irqstack+31628>) at arch/um/os-Linux/signal.c:165
mc = 0x85cfba0 <cpu0_irqstack+31648>
pending = 0
#33 <signal handler called>
No symbol table info available.
#34 0x084c8084 in ?? ()
No symbol table info available.
#35 0x000c2444 in ?? ()
No symbol table info available.
#36 0xc7000000 in ?? ()
No symbol table info available.
#37 0x00082444 in ?? ()
No symbol table info available.
#38 0x89000000 in ?? ()
No symbol table info available.
#39 0xc704245c in ?? ()
No symbol table info available.
#40 0x00072404 in ?? ()
No symbol table info available.
#41 0x18e80000 in ?? ()
No symbol table info available.

[New LWP 28563]
Core was generated by `/home/tfoerste/devel/linux/linux earlyprintk ubda=/home/tfoerste/virtual/uml/tr'. Program terminated with signal 6, Aborted.
#0 0xb77c9424 in __kernel_vsyscall ()
#0 0xb77c9424 in __kernel_vsyscall ()
No symbol table info available.
#1 0x083c4655 in kill ()
No symbol table info available.
#2 0x08072a5d in uml_abort () at arch/um/os-Linux/util.c:93
sig = <incomplete type>
#3 0x08072d95 in os_dump_core () at arch/um/os-Linux/util.c:148

        pid = 0
#4  0x080624dd in panic_exit (self=0x85d1558 <panic_exit_notifier>, unused1=0, unused2=0x8607720 <buf.17094>) at arch/um/kernel/um_arch.c:240
No locals.
#5  0x0809ab66 in notifier_call_chain (nl=0x0, val=0, v=0x8607720 <buf.17094>, nr_to_call=-2, nr_calls=0x0) at kernel/notifier.c:93
        ret = 0
        nb = 0x46d47ad0
#6  0x0809ac81 in __atomic_notifier_call_chain (nh=0x8607704 <panic_notifier_list>, val=0, v=0x8607720 <buf.17094>, nr_to_call=0, nr_calls=0x0) at kernel/notifier.c:182
        ret = 0
#7  0x0809acbf in atomic_notifier_call_chain (nh=0x0, val=0, v=0x0) at kernel/notifier.c:191
No locals.
#8  0x08421c6c in panic (fmt=0x0) at kernel/panic.c:130
        buf = "do_syscall_stub : PTRACE_SETREGS failed, errno = 3\n", '\000' <repeats 972 times>
        i_next = 17
        state = 1188330484
#9  0x08073d55 in do_syscall_stub (addr=<optimized out>, mm_idp=<optimized out>) at arch/um/os-Linux/skas/mem.c:68
        i = 17
        ret = 1188330532
        syscall = 0x80755d8 <switch_threads+40>
        err = 0
        pid = 134698456
#10 run_syscall_stub (mm_idp=0x47f2d95c, syscall=6, args=0x46d47ad0, expected=1188330192, addr=0x46d47ca4, done=1) at arch/um/os-Linux/skas/mem.c:142
No locals.
#11 0x0807429f in map (mm_idp=0x47f2d95c, virt=6, len=4096, prot=7, phys_fd=3, offset=1064071168, done=0, data=0x0) at arch/um/os-Linux/skas/mem.c:210
        args = {1073876992, 4096, 7, 17, 3, 259783}
#12 0x080616ff in flush_tlb_page (vma=0x0, address=1073879092) at arch/um/kernel/tlb.c:421
        offset = 1064071168
        fd = 0
        pte = 0x46d85084
        mm = 0x46d47ad0
        flush = 0x0
        r = 6
        prot = 7
        err = 0
        mm_id = 0x47f2d95c
#13 0x08061db1 in handle_page_fault (address=1073879092, ip=0, is_write=1, is_user=1, code_out=0x46d47d34) at arch/um/kernel/trap.c:119
        mm = 0x0
        vma = 0x46deb7f8
        err = 0
        __func__ = "handle_page_fault"
#14 0x08062c9e in maybe_map (is_write=<optimized out>, virt=<optimized out>) at arch/um/kernel/skas/uaccess.c:48
        err = 0
        dummy_code = 196610
#15 do_op_one_page (addr=1073879092, len=1996, is_write=1, op=0x8062af0 <clear_chunk>, arg=0x0) at arch/um/kernel/skas/uaccess.c:67
        buf = 0x46d47d3c
        pte = 0x0
        n = 0

#16 0x08062e19 in buffer_op (addr=1073879092, len=1996, is_write=1, op=0x8062af0 <clear_chunk>, arg=0x0) at arch/um/kernel/skas/uaccess.c:98
No locals.
#17 0x08063169 in clear_user (mem=0x40021834, len=0) at arch/um/kernel/skas/uaccess.c:231
No locals.
#18 0x08149f73 in padzero (elf_bss=0) at fs/binfmt_elf.c:113
No locals.
#19 0x0814bec9 in load_elf_interp (no_base=<optimized out>, interp_map_addr=<optimized out>, interpreter=<optimized out>, interp_elf_ex=<optimized out>) at fs/binfmt_elf.c:519
retval = 0
load_addr_set = 1
total_size = 6
i = 7
#20 load_elf_binary (bprm=0x46ca2be0) at fs/binfmt_elf.c:901

        interpreter = 0x47fa0e40
        load_addr = 134512640
        load_bias = 0
        load_addr_set = 0
        elf_interpreter = 0x46e1b0f0 "/lib/ld-linux.so.2"
        elf_phdata = 0x46cbed20
        size = 1073879292
        elf_entry = 1073879292
        interp_load_addr = 1188330192
        executable_stack = 1073879292
        loc = 0x46cb2dc0

#21 0x08109bd5 in search_binary_handler (bprm=0x46ca2be0) at fs/exec.c:1391
fmt = 0x85dcf18 <elf_format>
retval = 0
#22 0x0810a055 in exec_binprm (bprm=<optimized out>) at fs/exec.c:1428

        old_vpid = 1265
#23 do_execve_common (envp=..., argv=..., filename=<optimized out>) at fs/exec.c:1534
        bprm = 0x46ca2be0
        displaced = 0x0
#24 do_execve (filename=0x47ce8010 "/bin/rmdir", __argv=0x81035a0 <default_llseek+112>, __envp=0x8103788 <SyS_llseek+24>) at fs/exec.c:1581
No locals.
#25 0x0810a5b2 in SYSC_execve (envp=<optimized out>, argv=<optimized out>, filename=<optimized out>) at fs/exec.c:1683
        path = 0x47ce8000
#26 SyS_execve (filename=135279776, argv=135280032, envp=135280520) at fs/exec.c:1678
        ret = 135280032
#27 0x08062a94 in handle_syscall (r=0x47fce5cc) at arch/um/kernel/skas/syscall.c:35
        syscall = 6
#28 0x08075085 in handle_trap (local_using_sysemu=<optimized out>, regs=<optimized out>, pid=<optimized out>) at arch/um/os-Linux/skas/process.c:198
        status = 1198586856
#29 userspace (regs=0x47fce5cc) at arch/um/os-Linux/skas/process.c:431
        sig = 1188330192
        timer = {it_interval = {tv_sec = 0, tv_usec = 0}, it_value = {tv_sec = 0, tv_usec = 20000}}
        err = 0
        status = 34175
        op = 141522984
        pid = 28559
        local_using_sysemu = 2
        si = <incomplete type>

#30 0x0805f750 in fork_handler () at arch/um/kernel/process.c:149 No locals.
#31 0x00000000 in ?? ()
No symbol table info available.

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This clear_user() stack-trace reminds me a lot of the problem I just had, and Richard solved for me.

It was that I used an "make oldconfig" with a previous Kernel .config file. When doing a new "make defconfig" then manually "make xconfig" to turn on the extras I need like iscsi and pnfs It all went back to fine.

(Also for me host and guest 64bit, I had to manually set
64bit for the guest compilation.)

[Which was a smack on my own head because I know from the past
that UML needs a good'n fresh "make defconfig" every once in a while. And I just forgot about that]

Just my $0.017
Boaz

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Am Sonntag, 1. Dezember 2013, 20:05:55 schrieb Toralf Förster:

What I can see is that UML panic()ed because PTRACE_SETREGS is failing with ESRCH. This means one of the UML SKAS0 helper threads got killed and is gone. This is very strange and makes me worry, because in this stage the helper is in stopped state and cannot really die by an UML error. Looks like it got killed from outside.
Is your host setup 100% sane? :)

Thanks,
//richard

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Hhm - I've had 1 script running, which start an UML - and another script, which every 3 minutes ssh into the started UML and run "halt; exit". Before that I manually did both steps.

I let run the script solution for a while and did different things - but of course I cannot swear that I did not by accident recalled a command from a bash history command which killed processes (which I do have regularly to do if I test the UML with trinity).

So likely my fault here - yes.

MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3

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Am Montag, 2. Dezember 2013, 22:32:11 schrieb Toralf Förster:

No big deal.
Please try to reproduce with a minimal test setup. No magic scripts and stuff. :)

Thanks,
//richard

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