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Date:	Wed, 4 Feb 2015 23:08:42 -0500
From:	william <william@...sse.org>
To:	linux-kernel@...r.kernel.org
Subject: Re: divide by zero oops in kernel 3.17.7

so it seems that i m hitting this bug :
https://lkml.org/lkml/2014/4/29/497

+ if (!divisor)
+ divisor = 1;

that have been fixed ( well it looks more like a workaround than a fix
seen from here ) in the 64 bit code but not in the 32 bit code ? I
understand it right ?

is it official that the 32 bit linux kernel is no more supported ?


On Sun, Jan 18, 2015 at 6:25 AM, william <william@...sse.org> wrote:
> hi all
>
> I just had the following kernel oops, its a 32 bits kernel, the
> problem was triggered by both mysql ( user 60 )  on cpu 2 and cpu 6
> and apache ( user 81 ) on cpu  4, at the same time, here is the log :
>
> Jan 15 22:16:17 gemelos kernel: divide error: 0000 [#1] SMP
> Jan 15 22:16:17 gemelos kernel: CPU: 2 PID: 18340 Comm: mysqld Not
> tainted 3.17.7-hardened-r1ww7_r10b #1
> Jan 15 22:16:17 gemelos kernel: Hardware name: Dell Inc. PowerEdge
> R210 II/03X6X0, BIOS 2.7.0 11/15/2013
> Jan 15 22:16:17 gemelos kernel: task: ee0c0930 ti: ee0c0c94 task.ti: ee0c0c94
> Jan 15 22:16:17 gemelos kernel: EIP: 0060:[<00249241>] EFLAGS: 00210246 CPU: 2
> Jan 15 22:16:17 gemelos kernel: EAX: 0000003a EBX: ffff66bd ECX:
> 00000000 EDX: 00000000
> Jan 15 22:16:17 gemelos kernel: ESI: 0000003a EDI: 0000003a EBP:
> c230fc6c ESP: c230fc48
> Jan 15 22:16:17 gemelos kernel: DS: 0068 ES: 0068 FS: 00d8 GS: 007b SS: 0068
> Jan 15 22:16:17 gemelos kernel: CR0: 80050033 CR2: 204bc454 CR3:
> 01a04080 CR4: 001407f0
> Jan 15 22:16:17 gemelos kernel: Stack:
> Jan 15 22:16:17 gemelos kernel: 00000542 00000000 c230fc74 00000000
> 00000000 00000000 00000000 00000000
> Jan 15 22:16:17 gemelos kernel: 00000000 c230fca8 000c1e69 00000000
> 00000000 02a70000 00000000 00000000
> Jan 15 22:16:17 gemelos kernel: 00000000 000002a7 0000003b 00000000
> 00000001 00000065 00000000 ee3d49c4
> Jan 15 22:16:17 gemelos kernel: Call Trace:
> Jan 15 22:16:17 gemelos kernel: [<000c1e69>] bdi_position_ratio+0x181/0x1dd
> Jan 15 22:16:17 gemelos kernel: [<000c2fc5>]
> balance_dirty_pages_ratelimited+0x43f/0x739
> Jan 15 22:16:17 gemelos kernel: [<00498fe8>] ? nft_target_init+0x6b/0x17b
> Jan 15 22:16:17 gemelos kernel: [<00498fe8>] ? nft_target_init+0x6b/0x17b
> Jan 15 22:16:17 gemelos kernel: [<001a784d>] ? __ext4_journal_stop+0x53/0x6c
> Jan 15 22:16:17 gemelos kernel: [<00017ffe>] ? intel_pmu_hw_config+0xa7/0xca
> Jan 15 22:16:17 gemelos kernel: [<000bb9ff>] generic_perform_write+0x172/0x1af
> Jan 15 22:16:17 gemelos kernel: [<003c0000>] ? bnx2x_queue_comp_cmd+0xcf/0x12d
> Jan 15 22:16:17 gemelos kernel: [<000bcbc0>]
> __generic_file_write_iter+0x444/0x4c5
> Jan 15 22:16:17 gemelos kernel: [<003c1000>] ? bnx2x_func_send_cmd+0xc7/0x459
> Jan 15 22:16:17 gemelos kernel: [<00200246>] ? sha256_transform+0x19e0/0x24a2
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<003c0000>] ? bnx2x_queue_comp_cmd+0xcf/0x12d
> Jan 15 22:16:17 gemelos kernel: [<00180245>] ext4_file_write_iter+0x3b2/0x473
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<000ee35d>] new_sync_write+0x5c/0x83
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<0000f000>] ? init_intel_cacheinfo+0x291/0x3bd
> Jan 15 22:16:17 gemelos kernel: [<003c0000>] ? bnx2x_queue_comp_cmd+0xcf/0x12d
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<000ee301>] ? do_sync_readv_writev+0x70/0x70
> Jan 15 22:16:17 gemelos kernel: [<000eee57>] vfs_write+0xe8/0x1c8
> Jan 15 22:16:17 gemelos kernel: [<000ef286>] SyS_write+0x3f/0x7f
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<003c0000>] ? bnx2x_queue_comp_cmd+0xcf/0x12d
> Jan 15 22:16:17 gemelos kernel: [<00510b09>] syscall_call+0x7/0x7
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<00010033>] ? print_cpu_info+0x19/0xb0
> Jan 15 22:16:17 gemelos kernel: [<00200293>] ? sha256_transform+0x1a2d/0x24a2
> Jan 15 22:16:17 gemelos kernel: [<00200293>] ? sha256_transform+0x1a2d/0x24a2
> Jan 15 22:16:17 gemelos kernel: [<00020033>] ?
> smp_trace_threshold_interrupt+0x13/0x85
> Jan 15 22:16:17 gemelos kernel: [<00200293>] ? sha256_transform+0x1a2d/0x24a2
> Jan 15 22:16:17 gemelos kernel: [<00200033>] ? sha256_transform+0x17cd/0x24a2
> Jan 15 22:16:17 gemelos kernel: [<00200293>] ? sha256_transform+0x1a2d/0x24a2
> Jan 15 22:16:17 gemelos kernel: [<00200033>] ? sha256_transform+0x17cd/0x24a2
> Jan 15 22:16:17 gemelos kernel: [<00200293>] ? sha256_transform+0x1a2d/0x24a2
> Jan 15 22:16:17 gemelos kernel: Code: 89 f9 83 ec 18 89 d7 8b 51 04 8b
> 01 85 d2 89 45 e8 89 d0 89 55 ec 75 2e 8b 4d e8 89 f3 89 fe 39 ce 73
> 04 31 f6 eb 10 89 f0 31 d2 <f7> f1 31 d2 89 c6 89 f8 f7 f1 89 d7 89 d8
> 89 fa 89 f3 f7 f1 89
> Jan 15 22:16:17 gemelos kernel: EIP: [<00249241>] div64_u64+0x36/0x106
> SS:ESP 0068:c230fc48
> Jan 15 22:16:17 gemelos kernel: divide error: 0000 [#2]
> Jan 15 22:16:17 gemelos kernel: ---[ end trace 16e28ee794763227 ]---
> Jan 15 22:16:17 gemelos kernel: grsec: banning user with uid 60 until
> system restart for suspicious kernel crash
> Jan 15 22:16:17 gemelos kernel: SMP
> Jan 15 22:16:17 gemelos kernel: CPU: 4 PID: 18516 Comm: apache2
> Tainted: G      D        3.17.7-hardened-r1ww7_r10b #1
> Jan 15 22:16:17 gemelos kernel: Hardware name: Dell Inc. PowerEdge
> R210 II/03X6X0, BIOS 2.7.0 11/15/2013
> Jan 15 22:16:17 gemelos kernel: task: ee0eced0 ti: ee0ed234 task.ti: ee0ed234
> Jan 15 22:16:17 gemelos kernel: EIP: 0060:[<00249241>] EFLAGS: 00210246 CPU: 4
> Jan 15 22:16:17 gemelos kernel: EAX: 0000003a EBX: ffff6647 ECX:
> 00000000 EDX: 00000000
> Jan 15 22:16:17 gemelos kernel: ESI: 0000003a EDI: 0000003a EBP:
> c23ebc58 ESP: c23ebc34
> Jan 15 22:16:17 gemelos kernel: DS: 0068 ES: 0068 FS: 00d8 GS: 007b SS: 0068
> Jan 15 22:16:17 gemelos kernel: CR0: 80050033 CR2: a18c2000 CR3:
> 01a04100 CR4: 001407f0
> Jan 15 22:16:17 gemelos kernel: Stack:
> Jan 15 22:16:17 gemelos kernel: 00000542 00000000 c23ebc60 00000000
> 00000000 00000000 00000000 00000000
> Jan 15 22:16:17 gemelos kernel: 00000000 c23ebc94 000c1e69 00000000
> 00000000 02a70000 00000000 00000000
> Jan 15 22:16:17 gemelos kernel: 00000000 000002a7 0000003b 00000000
> 00000001 00000065 00000000 ee3d49c4
> Jan 15 22:16:17 gemelos kernel: Call Trace:
> Jan 15 22:16:17 gemelos kernel: [<000c1e69>] bdi_position_ratio+0x181/0x1dd
> Jan 15 22:16:17 gemelos kernel: [<000c2fc5>]
> balance_dirty_pages_ratelimited+0x43f/0x739
> Jan 15 22:16:17 gemelos kernel: [<00498fe8>] ? nft_target_init+0x6b/0x17b
> Jan 15 22:16:17 gemelos kernel: [<00498fe8>] ? nft_target_init+0x6b/0x17b
> Jan 15 22:16:17 gemelos kernel: [<001a784d>] ? __ext4_journal_stop+0x53/0x6c
> Jan 15 22:16:17 gemelos kernel: [<00017ffe>] ? intel_pmu_hw_config+0xa7/0xca
> Jan 15 22:16:17 gemelos kernel: [<000bb9ff>] generic_perform_write+0x172/0x1af
> Jan 15 22:16:17 gemelos kernel: [<000bcbc0>]
> __generic_file_write_iter+0x444/0x4c5
> Jan 15 22:16:17 gemelos kernel: [<00200246>] ? sha256_transform+0x19e0/0x24a2
> Jan 15 22:16:17 gemelos kernel: [<00180245>] ext4_file_write_iter+0x3b2/0x473
> Jan 15 22:16:17 gemelos kernel: [<000ee35d>] new_sync_write+0x5c/0x83
> Jan 15 22:16:17 gemelos kernel: [<000ee301>] ? do_sync_readv_writev+0x70/0x70
> Jan 15 22:16:17 gemelos kernel: [<000eee57>] vfs_write+0xe8/0x1c8
> Jan 15 22:16:17 gemelos kernel: [<000ef391>] SyS_pwrite64+0x52/0x79
> Jan 15 22:16:17 gemelos kernel: [<00510b09>] syscall_call+0x7/0x7
> Jan 15 22:16:17 gemelos kernel: [<00200246>] ? sha256_transform+0x19e0/0x24a2
> Jan 15 22:16:17 gemelos kernel: [<00510b29>] ? restore_all_pax+0xc/0xc
> Jan 15 22:16:17 gemelos kernel: [<0051007b>] ? ldsem_down_read+0x3b/0x163
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<00200202>] ? sha256_transform+0x199c/0x24a2
> Jan 15 22:16:17 gemelos kernel: [<00200033>] ? sha256_transform+0x17cd/0x24a2
> Jan 15 22:16:17 gemelos kernel: [<00200286>] ? sha256_transform+0x1a20/0x24a2
> Jan 15 22:16:17 gemelos kernel: Code: 89 f9 83 ec 18 89 d7 8b 51 04 8b
> 01 85 d2 89 45 e8 89 d0 89 55 ec 75 2e 8b 4d e8 89 f3 89 fe 39 ce 73
> 04 31 f6 eb 10 89 f0 31 d2 <f7> f1 31 d2 89 c6 89 f8 f7 f1 89 d7 89 d8
> 89 fa 89 f3 f7 f1 89
> Jan 15 22:16:17 gemelos kernel: EIP: [<00249241>] div64_u64+0x36/0x106
> SS:ESP 0068:c23ebc34
> Jan 15 22:16:17 gemelos kernel: divide error: 0000 [#3]
> Jan 15 22:16:17 gemelos kernel: ---[ end trace 16e28ee794763228 ]---
> Jan 15 22:16:17 gemelos kernel: grsec: banning user with uid 81 until
> system restart for suspicious kernel crash
> Jan 15 22:16:17 gemelos kernel: SMP
> Jan 15 22:16:17 gemelos kernel: CPU: 6 PID: 18483 Comm: mysqld
> Tainted: G      D        3.17.7-hardened-r1ww7_r10b #1
> Jan 15 22:16:17 gemelos kernel: Hardware name: Dell Inc. PowerEdge
> R210 II/03X6X0, BIOS 2.7.0 11/15/2013
> Jan 15 22:16:17 gemelos kernel: task: ee0a4e10 ti: ee0a5174 task.ti: ee0a5174
> Jan 15 22:16:17 gemelos kernel: EIP: 0060:[<00249241>] EFLAGS: 00210246 CPU: 6
> Jan 15 22:16:17 gemelos kernel: EAX: 0000003a EBX: ffff64e5 ECX:
> 00000000 EDX: 00000000
> Jan 15 22:16:17 gemelos kernel: ESI: 0000003a EDI: 0000003a EBP:
> ebe7bbfc ESP: ebe7bbd8
> Jan 15 22:16:17 gemelos kernel: DS: 0068 ES: 0068 FS: 00d8 GS: 007b SS: 0068
> Jan 15 22:16:17 gemelos kernel: CR0: 80050033 CR2: a3400000 CR3:
> 01a04180 CR4: 001407f0
> Jan 15 22:16:17 gemelos kernel: Stack:
> Jan 15 22:16:17 gemelos kernel: 00000542 00000000 ebe7bc04 00000000
> 00000000 00000000 00000000 00000000
> Jan 15 22:16:17 gemelos kernel: 00000000 ebe7bc38 000c1e69 00000000
> 00000000 02a70000 00000000 00000000
> Jan 15 22:16:17 gemelos kernel: 00000000 000002a7 0000003b 00000000
> 00000001 00000065 00000000 ee3d49c4
> Jan 15 22:16:17 gemelos kernel: Call Trace:
> Jan 15 22:16:17 gemelos kernel: [<000c1e69>] bdi_position_ratio+0x181/0x1dd
> Jan 15 22:16:17 gemelos kernel: [<000c2fc5>]
> balance_dirty_pages_ratelimited+0x43f/0x739
> Jan 15 22:16:17 gemelos kernel: [<00498fe8>] ? nft_target_init+0x6b/0x17b
> Jan 15 22:16:17 gemelos kernel: [<00498fe8>] ? nft_target_init+0x6b/0x17b
> Jan 15 22:16:17 gemelos kernel: [<001a784d>] ? __ext4_journal_stop+0x53/0x6c
> Jan 15 22:16:17 gemelos kernel: [<00017ffe>] ? intel_pmu_hw_config+0xa7/0xca
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<000bb9ff>] generic_perform_write+0x172/0x1af
> Jan 15 22:16:17 gemelos kernel: [<000bcbc0>]
> __generic_file_write_iter+0x444/0x4c5
> Jan 15 22:16:17 gemelos kernel: [<00200246>] ? sha256_transform+0x19e0/0x24a2
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<00180245>] ext4_file_write_iter+0x3b2/0x473
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<000ee35d>] new_sync_write+0x5c/0x83
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<000ee301>] ? do_sync_readv_writev+0x70/0x70
> Jan 15 22:16:17 gemelos kernel: [<000eee57>] vfs_write+0xe8/0x1c8
> Jan 15 22:16:17 gemelos kernel: [<000ef286>] SyS_write+0x3f/0x7f
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<00510b09>] syscall_call+0x7/0x7
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<00200293>] ? sha256_transform+0x1a2d/0x24a2
> Jan 15 22:16:17 gemelos kernel: [<00510b29>] ? restore_all_pax+0xc/0xc
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<00200293>] ? sha256_transform+0x1a2d/0x24a2
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<00010000>] ? print_cpu_msr+0x3b/0x55
> Jan 15 22:16:17 gemelos kernel: [<00200033>] ? sha256_transform+0x17cd/0x24a2
> Jan 15 22:16:17 gemelos kernel: [<00200293>] ? sha256_transform+0x1a2d/0x24a2
> Jan 15 22:16:17 gemelos kernel: Code: 89 f9 83 ec 18 89 d7 8b 51 04 8b
> 01 85 d2 89 45 e8 89 d0 89 55 ec 75 2e 8b 4d e8 89 f3 89 fe 39 ce 73
> 04 31 f6 eb 10 89 f0 31 d2 <f7> f1 31 d2 89 c6 89 f8 f7 f1 89 d7 89 d8
> 89 fa 89 f3 f7 f1 89
> Jan 15 22:16:17 gemelos kernel: EIP: [<00249241>] div64_u64+0x36/0x106
> SS:ESP 0068:ebe7bbd8
> Jan 15 22:16:17 gemelos kernel: ---[ end trace 16e28ee794763229 ]---
> Jan 15 22:16:17 gemelos kernel: grsec: banning user with uid 60 until
> system restart for suspicious kernel crash
>
> this could be related to this thread :
> https://lkml.org/lkml/2014/11/1/52
>
> I just rebuilt my kernel with CONFIG_DEBUG_INFO_REDUCED and
> CONFIG_DEBUG_INFO to get more infos if the oops happen again, please
> tell me whatever i could do to help you trace the bug.
>
> answering to the other thread ( https://lkml.org/lkml/2014/11/11/870 )
> I have :
>
>  cat /proc/sys/vm/dirty_ratio
> 20
>
> cat /proc/sys/vm/dirty_background_ratio
> 10
>
>
>
>
>
> --
> Cordialement
>
>        -----------------------------------
>
>  William Waisse
>   http://waisse.org | http://neoskills.com
>    http://cahierspip.ww7.be | http://feeder.ww7.be
> Computers are like air conditionners. They work better when you close windows.



-- 
Cordialement

       -----------------------------------

 William Waisse
  http://waisse.org | http://neoskills.com
   http://cahierspip.ww7.be | http://feeder.ww7.be
Computers are like air conditionners. They work better when you close windows.
--
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