Kernel mode fault at addr 0x92c00000, ip 0x80bcead
This is 2.6.18-um, on top of a 2.6.16.29-skas3-v8.2 host.
Kernel file is here:
http://www.theshore.net/~caker/uml/kernels/2.6.18-linode25
Kernel panic - not syncing: Kernel mode fault at addr 0x92c00000, ip
0x80bcead
EIP: 0073:[<080bcead>] CPU: 0 Not tainted ESP: 007b:bf55b798 EFLAGS:
00200246
Not tainted
EAX: ffffffda EBX: 00000003 ECX: 40118003 EDX: 000fa718
ESI: 40118003 EDI: 4021271b EBP: bf55b7d8 DS: 007b ES: 007b
85a0f2f8: [<800519a0>] notifier_call_chain+0x2a/0x40 85a0f314: [<8003ef57>] panic+0x70/0x102 85a0f32c: [<8001eb96>] segv+0x29d/0x2cb 85a0f35c: [<80058df6>] autoremove_wake_function+0x2f/0x57 85a0f368: [<8007f636>] kmem_cache_free+0x54/0xdc 85a0f384: [<8004c62d>] __mod_timer+0x75/0xb3 85a0f3f8: [<8001e8ba>] segv_handler+0xa5/0xe4 85a0f41c: [<8001e815>] segv_handler+0x0/0xe4 85a0f420: [<80034abc>] sig_handler_common_skas+0x94/0xe5 85a0f444: [<80030bdd>] sig_handler+0x5d/0x68 85a0f45c: [<8039a828>] __restore+0x0/0x8 85a0f49c: [<800350cf>] csum_partial+0xdb/0xe8 85a0f4bc: [<80062d52>] handle_IRQ_event+0x45/0x69 85a0f4d8: [<802585d3>] rb_erase+0x5b/0x102 85a0f4e8: [<8007f636>] kmem_cache_free+0x54/0xdc 85a0f4f0: [<8004c593>] lock_timer_base+0x2a/0x4f 85a0f504: [<8004c62d>] __mod_timer+0x75/0xb3 85a0f510: [<8024f14c>] as_can_break_anticipation+0xef/0x182 85a0f524: [<8024eb7c>] as_antic_waitnext+0x29/0x68 85a0f530: [<8024f206>] as_can_anticipate+0x27/0x37 85a0f53c: [<8024fab4>] as_dispatch_request+0x2f4/0x378 85a0f548: [<80261c6c>] __add_entropy_words+0x74/0x174 85a0f564: [<8024594b>] elv_next_request+0x45/0x156 85a0f570: [<80068274>] mempool_free+0x83/0x93 85a0f584: [<8002a9de>] do_ubd_request+0x2b/0xbd 85a0f5a0: [<8001a1ce>] find_irq_by_fd+0x53/0x83 85a0f5a8: [<80030b12>] maybe_sigio_broken+0x1a/0x58 85a0f5c4: [<8003a6bc>] __activate_task+0x27/0x3f 85a0f5e8: [<8003a6bc>] __activate_task+0x27/0x3f 85a0f600: [<8003a7f7>] activate_task+0x6e/0x7b 85a0f614: [<800466cc>] local_bh_enable+0x8/0xa9 85a0f624: [<8003a8d6>] try_to_wake_up+0x90/0xa5 85a0f638: [<80327340>] ipt_do_table+0x248/0x323 85a0f640: [<800466cc>] local_bh_enable+0x8/0xa9 85a0f648: [<80058df6>] autoremove_wake_function+0x2f/0x57 85a0f670: [<803291a5>] ip_nat_fn+0x7b/0x1e7 85a0f684: [<802e1607>] ip_local_deliver_finish+0x0/0x1ef 85a0f688: [<80328b03>] ipt_hook+0x37/0x3b 85a0f6a4: [<802d8569>] nf_iterate+0x63/0x7b 85a0f6b8: [<802fe15e>] tcp_v4_rcv+0x4ce/0x8c5 85a0f6c8: [<802e1607>] ip_local_deliver_finish+0x0/0x1ef 85a0f718: [<80030fc0>] set_signals+0x1c/0x28 85a0f720: [<800466cc>] local_bh_enable+0x8/0xa9 85a0f724: [<8004c62d>] __mod_timer+0x75/0xb3 85a0f738: [<80030fc0>] set_signals+0x1c/0x28 85a0f74c: [<802aafe2>] skb_checksum+0xe7/0x28f 85a0f75c: [<802aa2ce>] pskb_expand_head+0xdc/0x15f 85a0f788: [<802afd31>] skb_checksum_help+0x9c/0x13e 85a0f7ac: [<803292fc>] ip_nat_fn+0x1d2/0x1e7 85a0f7dc: [<802e6c72>] dst_output+0x0/0x14 85a0f7e0: [<80329528>] ip_nat_local_fn+0x75/0xf3 85a0f7f4: [<802e6c72>] dst_output+0x0/0x14 85a0f804: [<802e6c72>] dst_output+0x0/0x14 85a0f808: [<802d8569>] nf_iterate+0x63/0x7b 85a0f81c: [<802e6c72>] dst_output+0x0/0x14 85a0f82c: [<802e6c72>] dst_output+0x0/0x14 85a0f830: [<802d85ec>] nf_hook_slow+0x6b/0xe4 85a0f84c: [<802e6c72>] dst_output+0x0/0x14 85a0f86c: [<802e4a44>] ip_queue_xmit+0x3d7/0x4c2 85a0f884: [<802e6c72>] dst_output+0x0/0x14 85a0f88c: [<800327ac>] setjmp_wrapper+0x5c/0x60 85a0f8b0: [<80032778>] setjmp_wrapper+0x28/0x60 85a0f8ec: [<8007f413>] kmem_cache_alloc+0x3b/0x5d 85a0f914: [<8006942b>] buffered_rmqueue+0xa2/0x11a 85a0f944: [<802f7668>] tcp_transmit_skb+0x2b8/0x4b1 85a0f964: [<802f83f5>] tcp_snd_test+0x33/0xf4 85a0f984: [<802f91fd>] tcp_push_one+0xde/0x159 85a0f9ac: [<802eca55>] tcp_sendmsg+0x438/0xe54 85a0fa0c: [<80032778>] setjmp_wrapper+0x28/0x60 85a0fa30: [<8030a718>] inet_sendmsg+0x4a/0x56 85a0fa48: [<802a4aad>] do_sock_write+0xbb/0xc5 85a0fa6c: [<802a4c5f>] sock_aio_write+0x95/0x99 85a0fae0: [<80082978>] do_sync_write+0xde/0x124 85a0fb00: [<800347c6>] switch_threads+0x61/0x6e 85a0fb3c: [<80058dc7>] autoremove_wake_function+0x0/0x57 85a0fb5c: [<8002311f>] buffer_op+0x47/0x77 85a0fb60: [<80022f86>] do_buffer_op+0x0/0x152 85a0fb90: [<80082b81>] vfs_write+0x1c3/0x23d 85a0fbc8: [<80082ccc>] sys_write+0x51/0x80 85a0fbf0: [<80022bda>] handle_syscall+0x11a/0x138 85a0fc58: [<80032eed>] move_registers+0x4c/0x66 85a0fc6c: [<80033b68>] handle_trap+0x31/0x12d 85a0fc74: [<80032f47>] save_registers+0x40/0x6c 85a0fc94: [<80034192>] userspace+0x1c7/0x21e 85a0fcf0: [<80022808>] fork_handler+0xef/0xff 85a0fd1c: [<8039a828>] __restore+0x0/0x8 85a0fd5c: [<8039aa81>] kill+0x11/0x20
Is this a UML issue?
-Chris
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Quoted 8 lines · Christopher S. Aker
This is 2.6.18-um, on top of a 2.6.16.29-skas3-v8.2 host.
Kernel file is here:
http://www.theshore.net/~caker/uml/kernels/2.6.18-linode25Kernel panic - not syncing: Kernel mode fault at addr 0x92c00000, ip
0x80bcead
The stack I get from that is:
85a0f49c: [<800350cf>] csum_partial+0xdb/0xe8 85a0f74c: [<802aafe2>] skb_checksum+0xe7/0x28f 85a0f788: [<802afd31>] skb_checksum_help+0x9c/0x13e 85a0f7ac: [<803292fc>] ip_nat_fn+0x1d2/0x1e7 85a0f7e0: [<80329528>] ip_nat_local_fn+0x75/0xf3 85a0f808: [<802d8569>] nf_iterate+0x63/0x7b 85a0f830: [<802d85ec>] nf_hook_slow+0x6b/0xe4 85a0f86c: [<802e4a44>] ip_queue_xmit+0x3d7/0x4c2 85a0f944: [<802f7668>] tcp_transmit_skb+0x2b8/0x4b1 85a0f984: [<802f91fd>] tcp_push_one+0xde/0x159 85a0f9ac: [<802eca55>] tcp_sendmsg+0x438/0xe54 85a0fa30: [<8030a718>] inet_sendmsg+0x4a/0x56 __sock_sendmsg 85a0fa48: [<802a4aad>] do_sock_write+0xbb/0xc5 85a0fa6c: [<802a4c5f>] sock_aio_write+0x95/0x99 85a0fae0: [<80082978>] do_sync_write+0xde/0x124 85a0fb90: [<80082b81>] vfs_write+0x1c3/0x23d 85a0fbc8: [<80082ccc>] sys_write+0x51/0x80 85a0fbf0: [<80022bda>] handle_syscall+0x11a/0x138 85a0fc6c: [<80033b68>] handle_trap+0x31/0x12d 85a0fc94: [<80034192>] userspace+0x1c7/0x21e 85a0fcf0: [<80022808>] fork_handler+0xef/0xff 85a0fd1c: [<8039a828>] __restore+0x0/0x8 85a0fd5c: [<8039aa81>] kill+0x11/0x20
Quoted 1 line
Is this a UML issue?
Hard to say. With a kernel fault, I'd be tempted to say so, but I see no UML code on the stack.
Have you seen just this one occurence of this? I spent part of the afternoon dusting off a patch which would provide the registers at the time of the segfault. That maybe would have helped here.
Jeff
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Quoted 9 lines · Jeff Dike
Quoted 8 lines · Christopher S. Aker
This is 2.6.18-um, on top of a 2.6.16.29-skas3-v8.2 host.
Kernel file is here:
http://www.theshore.net/~caker/uml/kernels/2.6.18-linode25Kernel panic - not syncing: Kernel mode fault at addr 0x92c00000, ip
0x80bcead
Jeff, are these addresses normal? They tell that the binary is a statically linked one - but what is the memory layout? Chris, can you post cat /proc/<pid>/maps on a running instance of that kernel, together with host and guest config (the guest's one is contained there, I know, but I don't have the time to extract).
I'm suspiscious about memory layout problems (say host with unusual splits, like 1G/3G, or some problem with memory mappings anyhow).
Quoted 1 line
The stack I get from that is:
I.e. all the rest are bogus functions?
There are automated solutions for this - compiling with frame pointers allows correct backtracing with a runtime penalty but is implemented; however, we could reuse (not copy, please, we cannot maintain it) the x86 DWARF unwinder (instead of using frame pointer and to slow down fast paths, additional out-of-line debug info are used when the stack trace is output) - but we should implement this latter one. Jeff, can you take a look at it?
Quoted 24 lines
85a0f49c: [<800350cf>] csum_partial+0xdb/0xe8 85a0f74c: [<802aafe2>] skb_checksum+0xe7/0x28f 85a0f788: [<802afd31>] skb_checksum_help+0x9c/0x13e 85a0f7ac: [<803292fc>] ip_nat_fn+0x1d2/0x1e7 85a0f7e0: [<80329528>] ip_nat_local_fn+0x75/0xf3 85a0f808: [<802d8569>] nf_iterate+0x63/0x7b 85a0f830: [<802d85ec>] nf_hook_slow+0x6b/0xe4 85a0f86c: [<802e4a44>] ip_queue_xmit+0x3d7/0x4c2 85a0f944: [<802f7668>] tcp_transmit_skb+0x2b8/0x4b1 85a0f984: [<802f91fd>] tcp_push_one+0xde/0x159 85a0f9ac: [<802eca55>] tcp_sendmsg+0x438/0xe54 85a0fa30: [<8030a718>] inet_sendmsg+0x4a/0x56 __sock_sendmsg 85a0fa48: [<802a4aad>] do_sock_write+0xbb/0xc5 85a0fa6c: [<802a4c5f>] sock_aio_write+0x95/0x99 85a0fae0: [<80082978>] do_sync_write+0xde/0x124 85a0fb90: [<80082b81>] vfs_write+0x1c3/0x23d 85a0fbc8: [<80082ccc>] sys_write+0x51/0x80 85a0fbf0: [<80022bda>] handle_syscall+0x11a/0x138 85a0fc6c: [<80033b68>] handle_trap+0x31/0x12d 85a0fc94: [<80034192>] userspace+0x1c7/0x21e 85a0fcf0: [<80022808>] fork_handler+0xef/0xff 85a0fd1c: [<8039a828>] __restore+0x0/0x8 85a0fd5c: [<8039aa81>] kill+0x11/0x20
Signature · 16 lines
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!". Paolo Giarrusso, aka Blaisorblade http://www.user-mode-linux.org/~blaisorblade Chiacchiera con i tuoi amici in tempo reale! http://it.yahoo.com/mail_it/foot/*http://it.messenger.yahoo.com ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ User-mode-linux-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
Quoted 10 lines · Blaisorblade
Quoted 9 lines · Jeff Dike
Quoted 8 lines · Christopher S. Aker
This is 2.6.18-um, on top of a 2.6.16.29-skas3-v8.2 host.
Kernel file is here:
http://www.theshore.net/~caker/uml/kernels/2.6.18-linode25Kernel panic - not syncing: Kernel mode fault at addr 0x92c00000, ip
0x80bcead
Quoted 8 lines
Jeff, are these addresses normal? They tell that the binary is a statically linked one - but what is the memory layout? Chris, can you post cat /proc/<pid>/maps on a running instance of that kernel, together with host and guest config (the guest's one is contained there, I know, but I don't have the time to extract).
I'm suspiscious about memory layout problems (say host with unusual splits, like 1G/3G, or some problem with memory mappings anyhow).
All the stuff you requested is in here:
http://www.theshore.net/~caker/uml/kmf/
http://www.theshore.net/~caker/uml/kmf/maps.txt (has the maps from all the UML's pids, in case you notice duplicates)
http://www.theshore.net/~caker/uml/kmf/config-2.6.18-um.txt
http://www.theshore.net/~caker/uml/kmf/config-2.6.16.29-1-bigmem-skas-v8.2.txt
Thanks!
-Chris
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Quoted 25 lines · Christopher S. Aker
Quoted 18 lines · Blaisorblade
Quoted 9 lines · Jeff Dike
Quoted 8 lines · Christopher S. Aker
This is 2.6.18-um, on top of a 2.6.16.29-skas3-v8.2 host.
Kernel file is here:
http://www.theshore.net/~caker/uml/kernels/2.6.18-linode25Kernel panic - not syncing: Kernel mode fault at addr 0x92c00000, ip
0x80bceadJeff, are these addresses normal? They tell that the binary is a statically linked one - but what is the memory layout? Chris, can you post
cat /proc/<pid>/maps on a running instance of that kernel, together with host and guest config (the guest's one is contained there, I know, but I don't have the time to extract).Quoted 2 lines
I'm suspiscious about memory layout problems (say host with unusual splits, like 1G/3G, or some problem with memory mappings anyhow).
All the stuff you requested is in here:
http://www.theshore.net/~caker/uml/kmf/
Quoted 6 lines
http://www.theshore.net/~caker/uml/kmf/maps.txt (has the maps from all the UML's pids, in case you notice duplicates)
http://www.theshore.net/~caker/uml/kmf/config-2.6.18-um.txt
http://www.theshore.net/~caker/uml/kmf/config-2.6.16.29-1-bigmem-skas-v8.2.
txt
Which is the cmd line? With how much memory where these instances started?
Ok, Jeff, I recall something but I'm not sure. I even thought kernel threads mapped the whole RAM at boot in their physical range part (which is their entire address space), but it does not seem so.
The host is just a 64G with 3G/1G split, however the UML is a TT+SKAS with HALF_GIGS=2 (which _is_ unusual, and could be replaced with disabling TT entirely, which gives a free 2,75G of memory space for UML). In fact, the UML binary starts at 0x8000 0000 (i.e. 2G), and there are various holes in the virtual RAM mapped in kernel side - a big part of about 30M (the 0x80607000-0x92c00000 range), then there is a 4M hole (the pre-vmalloc hole should be 8M, but we have a 4M hole for uml_reserved after current brk()), then various holes and allocated ranges (with varying offsets) here and there, like if the area were allocated for vmalloc(). The problem is that we have an allocated anonymous memory range (which the checksum is accessing) before the 4M hole!
80000000-80514000 rwxp 00000000 fd:00 540678 /vbin/kernel/2.6.18-linode25
80514000-80607000 rwxp 80514000 00:00 0 [heap]
80607000-92c00000 rwxs 00607000 00:16
738427 /linodes/encode1/tmp/vm_file-AVT0fb (deleted) <hole here> 93000000-9300b000 rwxs 006b6000 00:16 738427 /linodes/encode1/tmp/vm_file-AVT0fb (deleted) 9300c000-93017000 rwxs 006c2000 00:16 738427 /linodes/encode1/tmp/vm_file-AVT0fb (deleted)
I can't follow this code at the moment, so I go for now. Bye!
Signature · 16 lines
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!". Paolo Giarrusso, aka Blaisorblade http://www.user-mode-linux.org/~blaisorblade Chiacchiera con i tuoi amici in tempo reale! http://it.yahoo.com/mail_it/foot/*http://it.messenger.yahoo.com ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ User-mode-linux-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
Quoted 1 line · Blaisorblade
Which is the cmd line? With how much memory where these instances started?
Kernel command line: mem=300M fake_ide fakehd con=null con0=fd:0,fd:1 devfs=nomount root=/dev/ubda ubda=<snip> 7 ubdb=<snip> eth0=tuntap,encode1_0,fe:fd:46:55:81:95 token_max=400000 token_refill=512
Quoted 6 lines
Ok, Jeff, I recall something but I'm not sure. I even thought kernel threads mapped the whole RAM at boot in their physical range part (which is their entire address space), but it does not seem so.
The host is just a 64G with 3G/1G split, however the UML is a TT+SKAS with HALF_GIGS=2 (which _is_ unusual, and could be replaced with disabling TT
Jeff had this discussion with me a few weeks ago when I was trying to get UML to use more than ~550M.
At that time, I tried disabling TT mode but had to revert because non-TT mode enabled umls wouldn't boot on some very old skas hosts of mine. I suspected that you might point in the same direction he did. That problem is less important since I should really just upgrade those boxes...
Quoted 20 lines
entirely, which gives a free 2,75G of memory space for UML). In fact, the UML binary starts at
0x80000000 (i.e. 2G), and there are various holes in the virtual RAM mapped in kernel side - a big part of about 30M (the 0x80607000-0x92c00000 range), then there is a 4M hole (the pre-vmalloc hole should be 8M, but we have a 4M hole foruml_reservedafter currentbrk()), then various holes and allocated ranges (with varying offsets) here and there, like if the area were allocated forvmalloc(). The problem is that we have an allocated anonymous memory range (which the checksum is accessing) before the 4M hole!80000000-80514000 rwxp 00000000 fd:00 540678 /vbin/kernel/2.6.18-linode25
80514000-80607000 rwxp 80514000 00:00 0 [heap]
80607000-92c00000 rwxs 00607000 00:16738427 /linodes/encode1/tmp/vm_file-AVT0fb (deleted) <hole here> 93000000-9300b000 rwxs 006b6000 00:16 738427 /linodes/encode1/tmp/vm_file-AVT0fb (deleted) 9300c000-93017000 rwxs 006c2000 00:16 738427 /linodes/encode1/tmp/vm_file-AVT0fb (deleted)
Quoted 2 lines
I can't follow this code at the moment, so I go for now. Bye!
-Chris
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Quoted 7 lines · Blaisorblade
Quoted 2 lines
Quoted 2 lines
Kernel panic - not syncing: Kernel mode fault at addr 0x92c00000, ip
0x80bceadJeff, are these addresses normal? They tell that the binary is a statically linked one - but what is the memory layout? Chris, can you post cat /proc/<pid>/maps on a running instance of that kernel, together with host and guest config (the guest's one is contained there, I know, but I don't have the time to extract).
I'm not sure. I've never trusted the numbers coming from that panic message (which hurts debugging, I know). I don't believe the fault address, and the IP doesn't match anything in the symbol table, so I don't believe that either.
Quoted 1 line
I.e. all the rest are bogus functions?
No. Above the skb_checksum frame, there are lots of occurrences of dst_output, which is a function pointer being passed down the stack. What remains looks like the remnants of old stacks.
Between csum_partial and skb_checksum, there's a big frame (and I don't know what's causing that) with what looks like old stack in it.
Quoted 6 lines
There are automated solutions for this - compiling with frame pointers allows correct backtracing with a runtime penalty but is implemented; however, we could reuse (not copy, please, we cannot maintain it) the x86 DWARF unwinder (instead of using frame pointer and to slow down fast paths, additional out-of-line debug info are used when the stack trace is output) - but we should implement this latter one. Jeff, can you take a look at it?
Yup, that sounds like a good idea.
Jeff
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Quoted 11 lines · Jeff Dike
Quoted 9 lines · Blaisorblade
Quoted 2 lines
Quoted 2 lines
Kernel panic - not syncing: Kernel mode fault at addr 0x92c00000, ip
0x80bceadJeff, are these addresses normal? They tell that the binary is a statically linked one - but what is the memory layout? Chris, can you post
cat /proc/<pid>/maps on a running instance of that kernel, together with host and guest config (the guest's one is contained there, I know, but I don't have the time to extract).
Quoted 4 lines
I'm not sure. I've never trusted the numbers coming from that panic message (which hurts debugging, I know). I don't believe the fault address, and the IP doesn't match anything in the symbol table, so I don't believe that either.
Ok, this is an issue, too.
Quoted 3 lines
Yup, that sounds like a good idea.
Jeff
Btw fixing even the above issue (if possible) would be another good idea - any major difficulty on that?
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Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!". Paolo Giarrusso, aka Blaisorblade http://www.user-mode-linux.org/~blaisorblade Chiacchiera con i tuoi amici in tempo reale! http://it.yahoo.com/mail_it/foot/*http://it.messenger.yahoo.com ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ User-mode-linux-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
Quoted 2 lines · Blaisorblade
Btw fixing even the above issue (if possible) would be another good idea - any major difficulty on that?
Not sure, I've always debugging these problems without relying on the panic message.
Fixing it is obviously the right thing to do, though.
Jeff
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Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
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