droid 4 in v4.18-rc: grep -r adasfasd /sys/ oopses

grep in /sys produces a nasty oops:

I guess next step is trying to find out which file that is..

[69642.787567] power_supply battery: driver failed to report `power_now' property: -22
[69645.052368] cpcap-usb-phy cpcap-usb-phy.0: connected to USB host
[69660.053009] Unhandled fault: imprecise external abort (0x1406) at 0x0044d038
[69660.053039] ------------[ cut here ]------------
[69660.053070] WARNING: CPU: 0 PID: 23862 at drivers/bus/omap_l3_noc.c:147 l3_interrupt_handler+0x23c/0x380
[69660.060150] pgd = 228114b5
[69660.064788] 44000000.ocp:L3 Custom Error: MASTER MPU TARGET L4PER2 (Read): Data Access in User mode during Functional access
[69660.074279] [0044d038] *pgd=be500831
[69660.076995] Modules linked in:
[69660.094940] CPU: 0 PID: 23862 Comm: bash Tainted: G        W         4.18.0-rc3-88788-g528947b #758
[69660.094940] Internal error: : 1406 [#1] SMP ARM
[69660.108581] Hardware name: Generic OMAP4 (Flattened Device Tree)
[69660.114624] [<c010f6cc>] (unwind_backtrace) from [<c010ba50>] (show_stack+0x10/0x14)
[69660.122436] [<c010ba50>] (show_stack) from [<c086d8cc>] (dump_stack+0x8c/0xac)
[69660.129699] [<c086d8cc>] (dump_stack) from [<c012d364>] (__warn+0xe8/0x114)
[69660.136718] [<c012d364>] (__warn) from [<c012d458>] (warn_slowpath_fmt+0x38/0x48)
[69660.144256] [<c012d458>] (warn_slowpath_fmt) from [<c03a0bdc>] (l3_interrupt_handler+0x23c/0x380)
[69660.153167] [<c03a0bdc>] (l3_interrupt_handler) from [<c0176ccc>] (__handle_irq_event_percpu+0x58/0x140)
[69660.162719] [<c0176ccc>] (__handle_irq_event_percpu) from [<c0176dd0>] (handle_irq_event_percpu+0x1c/0x58)
[69660.172424] [<c0176dd0>] (handle_irq_event_percpu) from [<c0176e44>] (handle_irq_event+0x38/0x5c)
[69660.181335] [<c0176e44>] (handle_irq_event) from [<c017a56c>] (handle_fasteoi_irq+0x94/0x124)
[69660.189910] [<c017a56c>] (handle_fasteoi_irq) from [<c0176550>] (generic_handle_irq+0x18/0x28)
[69660.198577] [<c0176550>] (generic_handle_irq) from [<c017664c>] (__handle_domain_irq+0x54/0xb4)
[69660.207336] [<c017664c>] (__handle_domain_irq) from [<c039fa2c>] (gic_handle_irq+0x4c/0xa0)
[69660.215728] [<c039fa2c>] (gic_handle_irq) from [<c0101a2c>] (__irq_svc+0x6c/0x90)
[69660.223236] Exception stack(0xecb67d40 to 0xecb67d88)
[69660.228332] 7d40: ef7b4a64 00000000 00000001 effdeabc effdeaa0 00000004 00000000 00000000
[69660.236541] 7d60: ef7b4a64 20070013 00000006 ef7b4a74 c0e62bd8 ecb67d90 c01c844c c01c813c
[69660.244750] 7d80: 60070013 ffffffff
[69660.248291] [<c0101a2c>] (__irq_svc) from [<c01c813c>] (release_pages+0x64/0x2fc)
[69660.255798] [<c01c813c>] (release_pages) from [<c01c844c>] (pagevec_lru_move_fn+0x78/0x94)
[69660.264129] [<c01c844c>] (pagevec_lru_move_fn) from [<c01c94d4>] (lru_add_drain_cpu+0xc4/0xf0)
[69660.272796] [<c01c94d4>] (lru_add_drain_cpu) from [<c01c970c>] (lru_add_drain+0x18/0x1c)
[69660.280914] [<c01c970c>] (lru_add_drain) from [<c01e7da4>] (exit_mmap+0x78/0x164)
[69660.288452] [<c01e7da4>] (exit_mmap) from [<c012aa68>] (mmput+0x44/0xf0)
[69660.295196] [<c012aa68>] (mmput) from [<c020a044>] (flush_old_exec+0x304/0x62c)
[69660.302551] [<c020a044>] (flush_old_exec) from [<c0250658>] (load_elf_binary+0x2b4/0x13ac)
[69660.310882] [<c0250658>] (load_elf_binary) from [<c0209c18>] (search_binary_handler+0x84/0x1ac)
[69660.319641] [<c0209c18>] (search_binary_handler) from [<c020ae24>] (__do_execve_file+0x508/0x684)
[69660.328552] [<c020ae24>] (__do_execve_file) from [<c020b000>] (do_execve+0x30/0x38)
[69660.336242] [<c020b000>] (do_execve) from [<c0101000>] (ret_fast_syscall+0x0/0x54)
[69660.343872] Exception stack(0xecb67fa8 to 0xecb67ff0)
[69660.348937] 7fa0:                   000d0000 000d0000 0010c8c8 0010e888 000f8008 e5d25300
[69660.357147] 7fc0: 000d0000 000d0000 0010c8c8 0000000b 0010c8c8 0010e888 000f8008 b6fc6ce8
[69660.365386] 7fe0: b6ed1711 bed367cc 0003c469 b6ed1716
[69660.370452] ---[ end trace 03c17ec6355a559d ]---
[69680.043853] Modules linked in:
[69680.046936] CPU: 1 PID: 23819 Comm: grep Tainted: G        W         4.18.0-rc3-88788-g528947b #758
[69680.056030] Hardware name: Generic OMAP4 (Flattened Device Tree)
[69680.062103] PC is at seq_printf+0x4/0x30
[69680.066040] LR is at __dregs_dump+0x5c/0x98
[69680.070251] pc : [<c0226898>]    lr : [<c0120ca0>]    psr: a0000013
[69680.076538] sp : ecb07e6c  ip : c0ae3a58  fp : 00000001
[69680.081787] r10: 00000001  r9 : ecb02100  r8 : ecb020d0
[69680.087036] r7 : ecb07f80  r6 : ecb020d0  r5 : 00000000  r4 : c0e10b54
[69680.093597] r3 : 48005020  r2 : 00000000  r1 : c0ae3a2c  r0 : ecb020d0
[69680.100158] Flags: NzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
[69680.107330] Control: 10c5387d  Table: acb3804a  DAC: 00000051
[69680.113128] Process grep (pid: 23819, stack limit = 0x5ef1c469)
[69680.119079] Stack: (0xecb07e6c to 0xecb08000)
[69680.123443] 7e60:                            c0ae3a2c 00000000 48005020 fa005020 c0ae3a58
[69680.131683] 7e80: ecb020d0 00008000 eca30b00 c0120d24 ecb07ea0 c0226e74 00440000 00000000
[69680.139892] 7ea0: 00000000 00000000 00000000 00000000 00000000 eca30b00 ee00b5f0 00000000
[69680.148101] 7ec0: ecb07f80 00008000 ecb06000 00440000 0043a0c8 c031a668 ecb07f80 ecc15400
[69680.156341] 7ee0: 00440000 eca30b00 ecb07f80 00008000 00440000 c0203e24 00000000 00000000
[69680.164550] 7f00: 000000c5 c0101204 00000001 eca30b08 00000000 00000000 00000000 00000000
[69680.172790] 7f20: 00000001 ee03f1c0 eca30b08 00020000 eca30b00 ecb07f80 ecb06000 00440000
[69680.180999] 7f40: 0043a0c8 00008000 eca30b00 00440000 00000000 ecb07f80 00440000 c0203fb0
[69680.189208] 7f60: 2160ec00 c0887b68 00000000 00000000 eca30b00 eca30b00 00008000 c0204448
[69680.197448] 7f80: 00000000 00000000 00000000 00008000 7fffe000 00440000 00000003 c0101204
[69680.205657] 7fa0: 00000003 c0101000 00008000 7fffe000 00000004 00440000 00008000 00008000
[69680.213897] 7fc0: 00008000 7fffe000 00440000 00000003 00000004 0043a0c8 00000004 0043a0c8
[69680.222106] 7fe0: 00000000 be90013c 00421175 b6eafa76 20000030 00000004 00000000 00000000
[69680.230346] [<c0226898>] (seq_printf) from [<48005020>] (0x48005020)
[69680.236724] Code: 3584000c 2584100c e8bd8038 e92d000e (e52de004) 
[69680.242858] ---[ end trace 03c17ec6355a559e ]---
[69680.259582] cpcap_adc cpcap_adc.0: error reading ADC: -512
[69680.265258] cpcap_battery cpcap_battery.0: cpcap_charger_battery_temperature failed: -512
[69680.265258] power_supply battery: driver failed to report `voltage_now' property: -512
[69680.287841] cpcap-usb-phy cpcap-usb-phy.0: connected to USB host

Quoted 3 lines

grep in /sys produces a nasty oops:

I guess next step is trying to find out which file that is..

Let me see...

openat(6, "suspend", O_RDONLY|O_NOCTTY|O_NONBLOCK|O_LARGEFILE|O_NOFOLLOW) = 4 fstat64(4, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
read(4, 0x4d2000, 32768) = -1 EINVAL (Invalid argument)
write(2, "grep: ", 6grep: ) = 6
write(2, "/sys/kernel/debug/pm_debug/cefus"..., 47/sys/kernel/debug/pm_debug/cefuse_pwrdm/suspend) = 47
write(2, ": Invalid argument", 18: Invalid argument) = 18
write(2, "\n", 1
) = 1
close(4) = 0
close(6) = 0
openat(5, "time", O_RDONLY|O_NOCTTY|O_NONBLOCK|O_LARGEFILE|O_NOFOLLOW) = 4
fstat64(4, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0 read(4, "cefuse_pwrdm (OFF),OFF:641441757"..., 32768) = 849
read(4, "", 28672) = 0
close(4) = 0
openat(5, "count", O_RDONLY|O_NOCTTY|O_NONBLOCK|O_LARGEFILE|O_NOFOLLOW) = 4 Connection to usb closed by remote host.
Connection to usb closed.
pavel at half:~$

Ok, so it seems to be:

user at devuan:~$ cat /sys/kernel/debug/pm_debug/count (oops).

The file seems to be world-readable.

user at devuan:~$ ls -al /sys/kernel/debug/pm_debug/count -r--r--r-- 1 root root 0 Jan 1 1970 /sys/kernel/debug/pm_debug/count

But on PC, that file does not exist.

Quoted 40 lines

Quoted 3 lines

grep in /sys produces a nasty oops:

I guess next step is trying to find out which file that is..

Let me see...

openat(6, "suspend", O_RDONLY|O_NOCTTY|O_NONBLOCK|O_LARGEFILE|O_NOFOLLOW) = 4 fstat64(4, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
read(4, 0x4d2000, 32768) = -1 EINVAL (Invalid argument)
write(2, "grep: ", 6grep: ) = 6
write(2, "/sys/kernel/debug/pm_debug/cefus"..., 47/sys/kernel/debug/pm_debug/cefuse_pwrdm/suspend) = 47
write(2, ": Invalid argument", 18: Invalid argument) = 18
write(2, "\n", 1
) = 1
close(4) = 0
close(6) = 0
openat(5, "time", O_RDONLY|O_NOCTTY|O_NONBLOCK|O_LARGEFILE|O_NOFOLLOW) = 4
fstat64(4, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0 read(4, "cefuse_pwrdm (OFF),OFF:641441757"..., 32768) = 849
read(4, "", 28672) = 0
close(4) = 0
openat(5, "count", O_RDONLY|O_NOCTTY|O_NONBLOCK|O_LARGEFILE|O_NOFOLLOW) = 4 Connection to usb closed by remote host.
Connection to usb closed.
pavel at half:~$

Ok, so it seems to be:

user at devuan:~$ cat /sys/kernel/debug/pm_debug/count (oops).

The file seems to be world-readable.

user at devuan:~$ ls -al /sys/kernel/debug/pm_debug/count -r--r--r-- 1 root root 0 Jan 1 1970 /sys/kernel/debug/pm_debug/count

Quoted 1 line

But on PC, that file does not exist.

Ok, it is easier to reproduce like this:

sudo mount /dev/zero -t debugfs /sys/kernel/debug/ sudo cat /sys/kernel/debug/pm_debug/count

I tried adding debugging like this:

Hi!

Quoted 43 lines

Quoted 43 lines

Quoted 3 lines

grep in /sys produces a nasty oops:

I guess next step is trying to find out which file that is..

Let me see...

openat(6, "suspend", O_RDONLY|O_NOCTTY|O_NONBLOCK|O_LARGEFILE|O_NOFOLLOW) = 4 fstat64(4, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
read(4, 0x4d2000, 32768) = -1 EINVAL (Invalid
argument)
write(2, "grep: ", 6grep: ) = 6
write(2, "/sys/kernel/debug/pm_debug/cefus"..., 47/sys/kernel/debug/pm_debug/cefuse_pwrdm/suspend) = 47
write(2, ": Invalid argument", 18: Invalid argument) = 18
write(2, "\n", 1
) = 1
close(4) = 0
close(6) = 0
openat(5, "time", O_RDONLY|O_NOCTTY|O_NONBLOCK|O_LARGEFILE|O_NOFOLLOW) = 4
fstat64(4, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0 read(4, "cefuse_pwrdm (OFF),OFF:641441757"..., 32768) = 849
read(4, "", 28672) = 0
close(4) = 0
openat(5, "count", O_RDONLY|O_NOCTTY|O_NONBLOCK|O_LARGEFILE|O_NOFOLLOW) = 4 Connection to usb closed by remote host. Connection to usb closed.
pavel at half:~$

Ok, so it seems to be:

user at devuan:~$ cat /sys/kernel/debug/pm_debug/count (oops).

The file seems to be world-readable.

user at devuan:~$ ls -al /sys/kernel/debug/pm_debug/count -r--r--r-- 1 root root 0 Jan 1 1970 /sys/kernel/debug/pm_debug/count

Quoted 8 lines

Quoted 1 line

But on PC, that file does not exist.

Ok, it is easier to reproduce like this:

sudo mount /dev/zero -t debugfs /sys/kernel/debug/ sudo cat /sys/kernel/debug/pm_debug/count

I tried adding debugging like this:

Confused.

Quoted 3 lines

seq_printf(s, "%s->%s (%d)\n", clkdm->name, clkdm-

Quoted 1 line

pwrdm.ptr->name,

clkdm->usecount);

I replaced seq_prinf with printk, and it still crashes, after producing reasonable output.

[   74.852508] cmp...
[   74.855773] printf...
[   74.859313] l4_cfg_clkdm->core_pwrdm (0)
[   74.864532] done...
[   74.867889] cmp...
[   74.871154] printf...
[   74.874694] l4_cefuse_clkdm->cefuse_pwrdm (0)
[   74.880340] done...
[   74.883728] ------------[ cut here ]------------
[   74.889709] WARNING: CPU: 0 PID: 2127 at
drivers/bus/omap_l3_noc.c:147 l3_interrupt_handler+0x23c/0x380
[   74.900695] 44000000.ocp:L3 Custom Error: MASTER MPU TARGET L4PER2
(Read): Data Access in User mode during Functional access
[   74.915222] Modules linked in:
[   74.919982] CPU: 0 PID: 2127 Comm: cat Not tainted
4.18.0-rc4-88970-gf075a2c-dirty #763
[   74.929870] Hardware name: Generic OMAP4 (Flattened Device Tree)
[   74.937805] [<c010f6cc>] (unwind_backtrace) from [<c010ba50>]

(show_stack+0x10/0x14)

Pavel

Ok, so it seems to be:

user at devuan:~$ cat /sys/kernel/debug/pm_debug/count (oops).

The file seems to be world-readable.

user at devuan:~$ ls -al /sys/kernel/debug/pm_debug/count -r--r--r-- 1 root root 0 Jan 1 1970 /sys/kernel/debug/pm_debug/count

But on PC, that file does not exist.

Any ideas?

Quoted 12 lines · Pavel Machek

Ok, so it seems to be:

user at devuan:~$ cat /sys/kernel/debug/pm_debug/count (oops).

The file seems to be world-readable.

user at devuan:~$ ls -al /sys/kernel/debug/pm_debug/count -r--r--r-- 1 root root 0 Jan 1 1970 /sys/kernel/debug/pm_debug/count

But on PC, that file does not exist.

Quoted 1 line

Any ideas?

I'm not seeing this as tested with omap2plus_defconfig and not seeing any unclocked module interrupts here.. Can you see if the script below produces something for you?

I had to filter out some trace pipes as they seem to hang.

Quoted 12 lines · Pavel Machek

Ok, so it seems to be:

user at devuan:~$ cat /sys/kernel/debug/pm_debug/count (oops).

The file seems to be world-readable.

user at devuan:~$ ls -al /sys/kernel/debug/pm_debug/count -r--r--r-- 1 root root 0 Jan 1 1970 /sys/kernel/debug/pm_debug/count

But on PC, that file does not exist.

Quoted 1 line

Any ideas?

I'm not seeing this as tested with omap2plus_defconfig and not seeing any unclocked module interrupts here.. Can you see if the script below produces something for you?

I had to filter out some trace pipes as they seem to hang.

Quoted 12 lines · Pavel Machek

Ok, so it seems to be:

user at devuan:~$ cat /sys/kernel/debug/pm_debug/count (oops).

The file seems to be world-readable.

user at devuan:~$ ls -al /sys/kernel/debug/pm_debug/count -r--r--r-- 1 root root 0 Jan 1 1970 /sys/kernel/debug/pm_debug/count

But on PC, that file does not exist.

Quoted 1 line

Any ideas?

I'm not seeing this as tested with omap2plus_defconfig and not seeing any unclocked module interrupts here.. Can you see if the script below produces something for you?

I had to filter out some trace pipes as they seem to hang.