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The following Kernel Panic occurred on my embedded board.
I am using 3.10 Kernel.
I am analyzing the cause of the Kernel Panic.
The Kernel Panic message shows the PID(735).

Feb 22 19:40:28 TEST kenel: CPU: 0 `PID: 735` Comm: cat Not tainted 3.10.73 #2 Feb 22 19:40:28 TEST kernel: Process cat `(pid: 735`, stack limit = 0xee46c238)

Does the PID mean the killer of the Kernel Panic?
Below is my entire Kernel Panic message.
Kernel Panic seems to be a really hard friend.... :(

Feb 22 19:40:28 TEST kernel: Unable to handle kernel NULL pointer dereference at virtual address 0000000c Feb 22 19:40:28 TEST kernel: pgd = c0004000 Feb 22 19:40:28 TEST kernel: [0000000c] *pgd=00000000 Feb 22 19:40:28 TEST kernel: Internal error: Oops: 17 [#1] PREEMPT SMP ARM Feb 22 19:40:28 TEST kernel: Modules linked in: m2i_trn g_m2i libcomposite iptable_filter ip_tables smsc95xx usbnet mousedev rh_special_switches pn5xx_i2c mram tsc2007 spicc buzzer cover backlight device_info [last unloaded: spi_fieldbus] Feb 22 19:40:28 TEST kernel: CPU: 0 PID: 735 Comm: cat Not tainted 3.10.73 #2 Feb 22 19:40:28 TEST kernel: task: ee404000 ti: ee46c000 task.ti: ee46c000 Feb 22 19:40:28 TEST kernel: PC is at set_page_dirty+0x20/0x68 Feb 22 19:40:28 TEST kernel: LR is at set_page_dirty+0xc/0x68 Feb 22 19:40:28 TEST kernel: pc : [<c00a3c50>] lr : [<c00a3c3c>] psr: a0000013 Feb 22 19:40:28 TEST kernel: sp : ee46de48 ip : 0002f9f9 fp : b6ffa000 Feb 22 19:40:28 TEST kernel: r10: ee46dee0 r9 : ee46de84 r8 : b6ffc000 Feb 22 19:40:28 TEST kernel: r7 : c0fd3860 r6 : 00000000 r5 : c0fd3860 r4 : ee3d87ec Feb 22 19:40:28 TEST kernel: r3 : 00000000 r2 : 40080068 r1 : c0fd3860 r0 : 00000012 Feb 22 19:40:28 TEST kernel: Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Feb 22 19:40:28 TEST kernel: Control: 10c5387d Table: 2eb3c04a DAC: 00000015 Feb 22 19:40:28 TEST kernel: Feb 22 19:40:28 TEST kernel: PC: 0xc00a3bd0: Feb 22 19:40:28 TEST kernel: 3bd0 e2505000 1a000001 e1a00005 e8bd8038 e375001c e2841048 03a0001a 13a00019 Feb 22 19:40:28 TEST kernel: 3bf0 eb0456e6 eafffff7 e92d4010 e1a04000 eb002f48 e590304c e5933010 e3130c02 Feb 22 19:40:28 TEST kernel: 3c10 08bd8010 e5943000 e3130a02 08bd8010 e1a00004 e3a0100d e8bd4010 eaffdee6 Feb 22 19:40:28 TEST kernel: 3c30 e92d4038 e1a05000 eb002f3a e3500000 0a00000a e5903044 e1a01005 e3a00012 Feb 22 19:40:28 TEST kernel: 3c50 e593400c eb044d0a e59f3034 e1a00005 e3540000 01a04003 e12fff34 e8bd8038 Feb 22 19:40:28 TEST kernel: 3c70 e5953000 e3130010 18bd8038 e1a01005 e3a00004 eb045711 e2700001 33a00000 Feb 22 19:40:28 TEST kernel: 3c90 e8bd8038 c00fd924 e92d4030 e1a04000 e24dd00c eb002f1f e5943000 e1a05000 Feb 22 19:40:28 TEST kernel: 3cb0 e3130001 0a00002b e3500000 0a000003 e590304c e5933010 e3130001 0a000004 Feb 22 19:40:28 TEST kernel: Feb 22 19:40:28 TEST kernel: LR: 0xc00a3bbc: Feb 22 19:40:28 TEST kernel: 3bbc e92d4038 e1a04002 e5923044 e5933000 e12fff33 e2505000 1a000001 e1a00005 Feb 22 19:40:28 TEST kernel: 3bdc e8bd8038 e375001c e2841048 03a0001a 13a00019 eb0456e6 eafffff7 e92d4010 Feb 22 19:40:28 TEST kernel: 3bfc e1a04000 eb002f48 e590304c e5933010 e3130c02 08bd8010 e5943000 e3130a02 Feb 22 19:40:28 TEST kernel: 3c1c 08bd8010 e1a00004 e3a0100d e8bd4010 eaffdee6 e92d4038 e1a05000 eb002f3a Feb 22 19:40:28 TEST kernel: 3c3c e3500000 0a00000a e5903044 e1a01005 e3a00012 e593400c eb044d0a e59f3034 Feb 22 19:40:28 TEST kernel: 3c5c e1a00005 e3540000 01a04003 e12fff34 e8bd8038 e5953000 e3130010 18bd8038 Feb 22 19:40:28 TEST kernel: 3c7c e1a01005 e3a00004 eb045711 e2700001 33a00000 e8bd8038 c00fd924 e92d4030 Feb 22 19:40:28 TEST kernel: 3c9c e1a04000 e24dd00c eb002f1f e5943000 e1a05000 e3130001 0a00002b e3500000 Feb 22 19:40:28 TEST kernel: Feb 22 19:40:28 TEST kernel: SP: 0xee46ddc8: Feb 22 19:40:28 TEST kernel: ddc8 000000a8 0000006d b6f6a000 c105ace0 00000000 ffffffff 0000006d c06c8f40 Feb 22 19:40:28 TEST kernel: dde8 c00a3c50 a0000013 ffffffff ee46de34 b6ffc000 c000dd98 00000012 c0fd3860 Feb 22 19:40:28 TEST kernel: de08 40080068 00000000 ee3d87ec c0fd3860 00000000 c0fd3860 b6ffc000 ee46de84 Feb 22 19:40:28 TEST kernel: de28 ee46dee0 b6ffa000 0002f9f9 ee46de48 c00a3c3c c00a3c50 a0000013 ffffffff Feb 22 19:40:28 TEST kernel: de48 326c375f ee3d87ec ee3d87e8 c00b8db0 ee46de58 ee785c00 c0f51b1c edef6f60 Feb 22 19:40:28 TEST kernel: de68 ee93edb8 326c375f ee46c000 ee93edb8 b6ffc000 b6ffbfff 60000013 00000000 Feb 22 19:40:28 TEST kernel: de88 fffffffe 00000000 ee46c000 edef6f60 ffffffff ee46dee0 00000000 00000000 Feb 22 19:40:28 TEST kernel: dea8 ee46c000 ee785c40 00000000 c00b98c0 00000000 ee46c000 edef6c60 ee46df08 Feb 22 19:40:28 TEST kernel: Feb 22 19:40:28 TEST kernel: R1: 0xc0fd37e0: Feb 22 19:40:28 TEST kernel: 37e0 40080068 ee913501 000010ea 00000000 00000001 c0fd37d4 c0fd3a34 00000000 Feb 22 19:40:28 TEST kernel: 3800 40080068 ee913501 000010e2 00000000 00000001 c0f94cf4 c0fd3754 00000000 Feb 22 19:40:28 TEST kernel: 3820 40080068 ee913501 000010da 00000000 00000001 c0fd3694 c0fd3734 00000000 Feb 22 19:40:28 TEST kernel: 3840 4002002c ef074d64 00000038 ffffffff 00000001 c0f92af4 c0f8ed94 00000000 Feb 22 19:40:28 TEST kernel: 3860 40080068 ee97a400 000b6ffa 00000000 00000001 c0fbbeb4 c0f91674 00000000 Feb 22 19:40:28 TEST kernel: 3880 4002002c ef074d64 00000033 ffffffff 00000001 c0fa6034 c0f94574 00000000 Feb 22 19:40:28 TEST kernel: 38a0 40000000 00000000 00000002 ffffffff 00000000 c0fc8a14 c0f91514 00000000 Feb 22 19:40:28 TEST kernel: 38c0 40080068 ee913501 00001146 00000000 00000001 c0fd8d54 c0f92d34 00000000 Feb 22 19:40:28 TEST kernel: Feb 22 19:40:28 TEST kernel: R4: 0xee3d876c: Feb 22 19:40:28 TEST kernel: 876c 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 Feb 22 19:40:28 TEST kernel: 878c 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 Feb 22 19:40:28 TEST kernel: 87ac 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 Feb 22 19:40:28 TEST kernel: 87cc 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 Feb 22 19:40:28 TEST kernel: 87ec 305b375f 00000000 31af57df 305d375f 00000000 00000000 00000000 00000000 Feb 22 19:40:28 TEST kernel: 880c 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 Feb 22 19:40:28 TEST kernel: 882c 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 Feb 22 19:40:28 TEST kernel: 884c 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 Feb 22 19:40:28 TEST kernel: Feb 22 19:40:28 TEST kernel: R5: 0xc0fd37e0: Feb 22 19:40:28 TEST kernel: 37e0 40080068 ee913501 000010ea 00000000 00000001 c0fd37d4 c0fd3a34 00000000 Feb 22 19:40:28 TEST kernel: 3800 40080068 ee913501 000010e2 00000000 00000001 c0f94cf4 c0fd3754 00000000 Feb 22 19:40:28 TEST kernel: 3820 40080068 ee913501 000010da 00000000 00000001 c0fd3694 c0fd3734 00000000 Feb 22 19:40:28 TEST kernel: 3840 4002002c ef074d64 00000038 ffffffff 00000001 c0f92af4 c0f8ed94 00000000 Feb 22 19:40:28 TEST kernel: 3860 40080068 ee97a400 000b6ffa 00000000 00000001 c0fbbeb4 c0f91674 00000000 Feb 22 19:40:28 TEST kernel: 3880 4002002c ef074d64 00000033 ffffffff 00000001 c0fa6034 c0f94574 00000000 Feb 22 19:40:28 TEST kernel: 38a0 40000000 00000000 00000002 ffffffff 00000000 c0fc8a14 c0f91514 00000000 Feb 22 19:40:28 TEST kernel: 38c0 40080068 ee913501 00001146 00000000 00000001 c0fd8d54 c0f92d34 00000000 Feb 22 19:40:28 TEST kernel: Feb 22 19:40:28 TEST kernel: R7: 0xc0fd37e0: Feb 22 19:40:28 TEST kernel: 37e0 40080068 ee913501 000010ea 00000000 00000001 c0fd37d4 c0fd3a34 00000000 Feb 22 19:40:28 TEST kernel: 3800 40080068 ee913501 000010e2 00000000 00000001 c0f94cf4 c0fd3754 00000000 Feb 22 19:40:28 TEST kernel: 3820 40080068 ee913501 000010da 00000000 00000001 c0fd3694 c0fd3734 00000000 Feb 22 19:40:28 TEST kernel: 3840 4002002c ef074d64 00000038 ffffffff 00000001 c0f92af4 c0f8ed94 00000000 Feb 22 19:40:28 TEST kernel: 3860 40080068 ee97a400 000b6ffa 00000000 00000001 c0fbbeb4 c0f91674 00000000 Feb 22 19:40:28 TEST kernel: 3880 4002002c ef074d64 00000033 ffffffff 00000001 c0fa6034 c0f94574 00000000 Feb 22 19:40:28 TEST kernel: 38a0 40000000 00000000 00000002 ffffffff 00000000 c0fc8a14 c0f91514 00000000 Feb 22 19:40:28 TEST kernel: 38c0 40080068 ee913501 00001146 00000000 00000001 c0fd8d54 c0f92d34 00000000 Feb 22 19:40:28 TEST kernel: Feb 22 19:40:28 TEST kernel: R9: 0xee46de04: Feb 22 19:40:28 TEST kernel: de04 c0fd3860 40080068 00000000 ee3d87ec c0fd3860 00000000 c0fd3860 b6ffc000 Feb 22 19:40:28 TEST kernel: de24 ee46de84 ee46dee0 b6ffa000 0002f9f9 ee46de48 c00a3c3c c00a3c50 a0000013 Feb 22 19:40:28 TEST kernel: de44 ffffffff 326c375f ee3d87ec ee3d87e8 c00b8db0 ee46de58 ee785c00 c0f51b1c Feb 22 19:40:28 TEST kernel: de64 edef6f60 ee93edb8 326c375f ee46c000 ee93edb8 b6ffc000 b6ffbfff 60000013 Feb 22 19:40:28 TEST kernel: de84 00000000 fffffffe 00000000 ee46c000 edef6f60 ffffffff ee46dee0 00000000 Feb 22 19:40:28 TEST kernel: dea4 00000000 ee46c000 ee785c40 00000000 c00b98c0 00000000 ee46c000 edef6c60 Feb 22 19:40:28 TEST kernel: dec4 ee46df08 ee785c00 ee785c00 ee46c000 c00bf4ec c0f696e0 0025ceb0 ee785c00 Feb 22 19:40:28 TEST kernel: dee4 00000001 00000000 00000000 ffffffff c045ec74 00000000 00000072 00000400 Feb 22 19:40:28 TEST kernel: Feb 22 19:40:28 TEST kernel: R10: 0xee46de60: Feb 22 19:40:28 TEST kernel: de60 c0f51b1c edef6f60 ee93edb8 326c375f ee46c000 ee93edb8 b6ffc000 b6ffbfff Feb 22 19:40:28 TEST kernel: de80 60000013 00000000 fffffffe 00000000 ee46c000 edef6f60 ffffffff ee46dee0 Feb 22 19:40:28 TEST kernel: dea0 00000000 00000000 ee46c000 ee785c40 00000000 c00b98c0 00000000 ee46c000 Feb 22 19:40:28 TEST kernel: dec0 edef6c60 ee46df08 ee785c00 ee785c00 ee46c000 c00bf4ec c0f696e0 0025ceb0 Feb 22 19:40:28 TEST kernel: dee0 ee785c00 00000001 00000000 00000000 ffffffff c045ec74 00000000 00000072 Feb 22 19:40:28 TEST kernel: df00 00000400 ee912000 00000000 c045ec74 00000000 c045e9dc 00000001 c045e7f8 Feb 22 19:40:28 TEST kernel: df20 00000000 c045ec74 ee785c30 ee785c00 00000000 ee404000 ee785c00 c0029360 Feb 22 19:40:28 TEST kernel: df40 ee4042fc c00302a0 00000020 00000001 c0680eb4 00000000 00060006 c004fa88 Feb 22 19:40:28 TEST kernel: Process cat (pid: 735, stack limit = 0xee46c238) Feb 22 19:40:28 TEST kernel: Stack: (0xee46de48 to 0xee46e000) Feb 22 19:40:28 TEST kernel: de40: 326c375f ee3d87ec ee3d87e8 c00b8db0 ee46de58 ee785c00 Feb 22 19:40:28 TEST kernel: de60: c0f51b1c edef6f60 ee93edb8 326c375f ee46c000 ee93edb8 b6ffc000 b6ffbfff Feb 22 19:40:28 TEST kernel: de80: 60000013 00000000 fffffffe 00000000 ee46c000 edef6f60 ffffffff ee46dee0 Feb 22 19:40:28 TEST kernel: dea0: 00000000 00000000 ee46c000 ee785c40 00000000 c00b98c0 00000000 ee46c000 Feb 22 19:40:28 TEST kernel: dec0: edef6c60 ee46df08 ee785c00 ee785c00 ee46c000 c00bf4ec c0f696e0 0025ceb0 Feb 22 19:40:28 TEST kernel: dee0: ee785c00 00000001 00000000 00000000 ffffffff c045ec74 00000000 00000072 Feb 22 19:40:28 TEST kernel: df00: 00000400 ee912000 00000000 c045ec74 00000000 c045e9dc 00000001 c045e7f8 Feb 22 19:40:28 TEST kernel: df20: 00000000 c045ec74 ee785c30 ee785c00 00000000 ee404000 ee785c00 c0029360 Feb 22 19:40:28 TEST kernel: df40: ee4042fc c00302a0 00000020 00000001 c0680eb4 00000000 00060006 c004fa88 Feb 22 19:40:28 TEST kernel: df60: c0680eb4 ef391d40 00000000 ee46c000 000000f8 c000e3e8 ee46c000 00000000 Feb 22 19:40:28 TEST kernel: df80: 00000000 c0030a20 00000000 000700de b6fd9760 b6fd9760 000000f8 c0030aa4 Feb 22 19:40:28 TEST kernel: dfa0: 00000000 c000e240 000700de b6fd9760 00000000 000700ca b6ff84c0 00000000 Feb 22 19:40:28 TEST kernel: dfc0: 000700de b6fd9760 b6fd9760 000000f8 00000002 00000000 00010000 00000000 Feb 22 19:40:28 TEST kernel: dfe0: 000000f8 be8b5474 b6f6afc3 b6f14276 60000030 00000000 00000000 00000000 Feb 22 19:40:28 TEST kernel: [<c00a3c50>] (set_page_dirty+0x20/0x68) from [<c00b8db0>] (unmap_single_vma+0x4d0/0x63c) Feb 22 19:40:28 TEST kernel: [<c00b8db0>] (unmap_single_vma+0x4d0/0x63c) from [<c00b98c0>] (unmap_vmas+0x54/0x68) Feb 22 19:40:28 TEST kernel: [<c00b98c0>] (unmap_vmas+0x54/0x68) from [<c00bf4ec>] (exit_mmap+0xd8/0x1f8) Feb 22 19:40:28 TEST kernel: [<c00bf4ec>] (exit_mmap+0xd8/0x1f8) from [<c0029360>] (mmput+0x48/0xf4) Feb 22 19:40:28 TEST kernel: [<c0029360>] (mmput+0x48/0xf4) from [<c00302a0>] (do_exit+0x244/0x878) Feb 22 19:40:28 TEST kernel: [<c00302a0>] (do_exit+0x244/0x878) from [<c0030a20>] (do_group_exit+0x3c/0xb0) Feb 22 19:40:28 TEST kernel: [<c0030a20>] (do_group_exit+0x3c/0xb0) from [<c0030aa4>] (__wake_up_parent+0x0/0x18) Feb 22 19:40:28 TEST kernel: Code: 0a00000a e5903044 e1a01005 e3a00012 (e593400c) Feb 22 19:40:28 TEST kernel: ---[ end trace 28aa0afec355b4f9 ]--- Feb 22 19:40:28 TEST kernel: Fixing recursive fault but reboot is needed!
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1 Answer 1

Reset to default
5

The cat program was running with a PID of 735 when the panic occurred, i.e. the fault happened in the context of the process with PID 735. This does not mean that the cat program did something wrong. The fault is in the kernel, a panic is something that should not happen under any circumstances (unless you really try with root privileges). The bug causing the panic can be in a device driver that is invoked when the cat program reads or writes from/to some device. Or it could be caused by a totally unrelated interrupt; all interrupt handlers are run in the context of the currently running process, even if they don't serve the process in any way.

As you have noticed, debugging a kernel panic is not an easy task.

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  • Kernel panics can also be caused by hardware failures. So indeed, not an easy task. Commented Feb 23, 2017 at 7:46
  • @JohanMyréen Wow. I never imagined cat meant cat program. I am using the system as root. It will help you debug a lot. Thank you. Commented Feb 23, 2017 at 7:49

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