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SubjectRe: divide by zero oops in kernel 3.17.7
From
[+cc andrew, rik, michal]

On Thu, Feb 5, 2015 at 5:08 AM, william <william@waisse.org> wrote:
> 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 ?

The data types may be tricking things up a bit. unsigned long is a 64
bit integer on 64 bit systems, but 32 bit integer on 32bit systems.

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

My guess would be that this option was simply overlooked.

Maybe some others can shine their light on it.

Frans


> On Sun, Jan 18, 2015 at 6:25 AM, william <william@waisse.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.
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
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