Re: Kernel 4.1.6 Panic due to slab corruption

[Nikolay Borisov]

Hi,

If you have the vmlinux image for the kernel you were running at the
time, the crash occured, could you post the output of addr2line -f -e
path/to/vmlinux ffffffff8115bd4d to see if it also fails in
get_freepointer.

Regards,
Nikolay

On 09/07/2015 01:37 PM, Holger HoffstÃtte wrote:
> On Mon, 07 Sep 2015 11:41:17 +0300, Nikolay Borisov wrote:
> 
>> Hello, 
>>
>> On one of our servers I've observed the a kernel pannic 
>> happening with the following backtrace:
>>
>> [654405.527070] BUG: unable to handle kernel paging request at 0000000000028001
>> [654405.527076] IP: [<ffffffff81182a59>] kmem_cache_alloc_node+0x99/0x1e0
>> [654405.527085] PGD 14bef58067 PUD 2ab358067 PMD 0 
> 
> Interesting! I can't offer much help but had a similar panic just the other day
> for no apparent reason while running a bunch of compiles. First time I've seen
> this with 4.1.6:
> 
> Sep  5 20:42:02 ragnarok kernel: BUG: unable to handle kernel paging request at ffff8800e789b740
> Sep  5 20:42:02 ragnarok kernel: IP: [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
> Sep  5 20:42:02 ragnarok kernel: PGD 1aa2067 PUD 61f7fd067 PMD 0 
> Sep  5 20:42:02 ragnarok kernel: Oops: 0000 [#1] SMP 
> Sep  5 20:42:02 ragnarok kernel: Modules linked in: auth_rpcgss oid_registry nfsv4 nfs lockd grace fscache sunrpc autofs4 sch_fq_codel snd_hda_codec_realtek x86_pkg_temp_thermal coretemp snd_hda_codec_generic crc32_pclmul crc32c_intel aesni_intel radeon aes_x86_64 glue_helper snd_hda_codec_hdmi lrw gf128mul ablk_helper cryptd i2c_algo_bit snd_usb_audio uvcvideo snd_hda_intel drm_kms_helper snd_hda_controller snd_hwdep videobuf2_vmalloc snd_usbmidi_lib videobuf2_memops snd_hda_codec videobuf2_core snd_rawmidi i2c_i801 ttm snd_hda_core v4l2_common snd_seq_device videodev snd_pcm usbhid drm snd_timer r8169 snd i2c_core mii soundcore parport_pc parport
> Sep  5 20:42:02 ragnarok kernel: CPU: 0 PID: 32755 Comm: sh Not tainted 4.1.6 #1
> Sep  5 20:42:02 ragnarok kernel: Hardware name: Gigabyte Technology Co., Ltd. P67-DS3-B3/P67-DS3-B3, BIOS F1 05/06/2011
> Sep  5 20:42:02 ragnarok kernel: task: ffff880569712e20 ti: ffff8804e4d90000 task.ti: ffff8804e4d90000
> Sep  5 20:42:02 ragnarok kernel: RIP: 0010:[<ffffffff8115bd4d>]  [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
> Sep  5 20:42:02 ragnarok kernel: RSP: 0018:ffff8804e4d93d88  EFLAGS: 00010282
> Sep  5 20:42:02 ragnarok kernel: RAX: 0000000000000000 RBX: ffff8805e7eacce0 RCX: 000000000001f7e8
> Sep  5 20:42:02 ragnarok kernel: RDX: 000000000001f7e7 RSI: 00000000000000d0 RDI: 0000000000018c70
> Sep  5 20:42:02 ragnarok kernel: RBP: ffff8804e4d93dc8 R08: ffff88061f418c70 R09: 0000000000000000
> Sep  5 20:42:02 ragnarok kernel: R10: ffffffff81748318 R11: ffffea00139bb500 R12: 00000000000000d0
> Sep  5 20:42:02 ragnarok kernel: R13: ffff880606890600 R14: ffffffff8100d039 R15: ffff8800e789b740
> Sep  5 20:42:02 ragnarok kernel: FS:  00007f9c1d2f2700(0000) GS:ffff88061f400000(0000) knlGS:0000000000000000
> Sep  5 20:42:02 ragnarok kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> Sep  5 20:42:02 ragnarok kernel: CR2: ffff8800e789b740 CR3: 00000005f68ce000 CR4: 00000000000406f0
> Sep  5 20:42:02 ragnarok kernel: Stack:
> Sep  5 20:42:02 ragnarok kernel:  0000000000000000 ffff88061f7e6c00 0000000000000002 ffff8805e7eacce0
> Sep  5 20:42:02 ragnarok kernel:  ffff880569712e20 0000000001200011 ffff8805e7eacce0 ffff880569712e20
> Sep  5 20:42:02 ragnarok kernel:  ffff8804e4d93de8 ffffffff8100d039 0000000000000000 00007f9c1d2f29d0
> Sep  5 20:42:02 ragnarok kernel: Call Trace:
> Sep  5 20:42:02 ragnarok kernel:  [<ffffffff8100d039>] arch_dup_task_struct+0x69/0x170
> Sep  5 20:42:02 ragnarok kernel:  [<ffffffff8104de8f>] copy_process.part.8+0x14f/0x1760
> Sep  5 20:42:02 ragnarok kernel:  [<ffffffff8113909f>] ? handle_mm_fault+0xd0f/0x13a0
> Sep  5 20:42:02 ragnarok kernel:  [<ffffffff81171c14>] ? get_empty_filp+0xd4/0x1c0
> Sep  5 20:42:02 ragnarok kernel:  [<ffffffff8105b63f>] ? recalc_sigpending+0x1f/0x60
> Sep  5 20:42:02 ragnarok kernel:  [<ffffffff8104f657>] do_fork+0xd7/0x370
> Sep  5 20:42:02 ragnarok kernel:  [<ffffffff8105ed07>] ? sigprocmask+0x57/0x90
> Sep  5 20:42:02 ragnarok kernel:  [<ffffffff8104f976>] SyS_clone+0x16/0x20
> Sep  5 20:42:02 ragnarok kernel:  [<ffffffff81571d17>] system_call_fastpath+0x12/0x6a
> Sep  5 20:42:02 ragnarok kernel: Code: 65 4c 03 05 ee e3 ea 7e 49 83 78 10 00 4d 8b 38 0f 84 b0 00 00 00 4d 85 ff 0f 84 a7 00 00 00 49 63 45 20 48 8d 4a 01 49 8b 7d 00 <49> 8b 1c 07 4c 89 f8 65 48 0f c7 0f 0f 94 c0 84 c0 74 b9 49 63 
> Sep  5 20:42:02 ragnarok kernel: RIP  [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
> Sep  5 20:42:02 ragnarok kernel:  RSP <ffff8804e4d93d88>
> Sep  5 20:42:02 ragnarok kernel: CR2: ffff8800e789b740
> Sep  5 20:42:02 ragnarok kernel: ---[ end trace e4478715791f5752 ]---
> Sep  5 20:42:02 ragnarok kernel: BUG: unable to handle kernel paging request at ffff8800e789b740
> Sep  5 20:42:02 ragnarok kernel: IP: [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
> Sep  5 20:42:02 ragnarok kernel: PGD 1aa2067 PUD 61f7fd067 PMD 0 
> Sep  5 20:42:02 ragnarok kernel: Oops: 0000 [#2] SMP 
> Sep  5 20:42:02 ragnarok kernel: Modules linked in: auth_rpcgss oid_registry nfsv4 nfs lockd grace fscache sunrpc autofs4 sch_fq_codel snd_hda_codec_realtek x86_pkg_temp_thermal coretemp snd_hda_codec_generic crc32_pclmul crc32c_intel aesni_intel radeon aes_x86_64 glue_helper snd_hda_codec_hdmi lrw gf128mul ablk_helper cryptd i2c_algo_bit snd_usb_audio uvcvideo snd_hda_intel drm_kms_helper snd_hda_controller snd_hwdep videobuf2_vmalloc snd_usbmidi_lib videobuf2_memops snd_hda_codec videobuf2_core snd_rawmidi i2c_i801 ttm snd_hda_core v4l2_common snd_seq_device videodev snd_pcm usbhid drm snd_timer r8169 snd i2c_core mii soundcore parport_pc parport
> Sep  5 20:42:02 ragnarok kernel: CPU: 0 PID: 32550 Comm: sh Tainted: G      D         4.1.6 #1
> Sep  5 20:42:02 ragnarok kernel: Hardware name: Gigabyte Technology Co., Ltd. P67-DS3-B3/P67-DS3-B3, BIOS F1 05/06/2011
> Sep  5 20:42:02 ragnarok kernel: task: ffff880602cd1ec0 ti: ffff8805b26ac000 task.ti: ffff8805b26ac000
> Sep  5 20:42:02 ragnarok kernel: RIP: 0010:[<ffffffff8115bd4d>]  [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
> Sep  5 20:42:02 ragnarok kernel: RSP: 0018:ffff8805b26afd88  EFLAGS: 00010282
> Sep  5 20:42:02 ragnarok kernel: RAX: 0000000000000000 RBX: ffff8805e7ea8f60 RCX: 000000000001f7e8
> Sep  5 20:42:02 ragnarok kernel: RDX: 000000000001f7e7 RSI: 00000000000000d0 RDI: 0000000000018c70
> Sep  5 20:42:02 ragnarok kernel: RBP: ffff8805b26afdc8 R08: ffff88061f418c70 R09: 0000000000000000
> Sep  5 20:42:02 ragnarok kernel: R10: ffffffff81748318 R11: ffffea0015a2ec00 R12: 00000000000000d0
> Sep  5 20:42:02 ragnarok kernel: R13: ffff880606890600 R14: ffffffff8100d039 R15: ffff8800e789b740
> Sep  5 20:42:02 ragnarok kernel: FS:  00007f9c1d2f2700(0000) GS:ffff88061f400000(0000) knlGS:0000000000000000
> Sep  5 20:42:02 ragnarok kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> Sep  5 20:42:02 ragnarok kernel: CR2: ffff8800e789b740 CR3: 00000005e3b76000 CR4: 00000000000406f0
> Sep  5 20:42:02 ragnarok kernel: Stack:
> Sep  5 20:42:02 ragnarok kernel:  0000000000000000 ffff88061f7e6c00 0000000000000002 ffff8805e7ea8f60
> Sep  5 20:42:02 ragnarok kernel:  ffff880602cd1ec0 0000000001200011 ffff8805e7ea8f60 ffff880602cd1ec0
> Sep  5 20:42:02 ragnarok kernel:  ffff8805b26afde8 ffffffff8100d039 0000000000000000 00007f9c1d2f29d0
> Sep  5 20:42:02 ragnarok kernel: Call Trace:
> Sep  5 20:42:02 ragnarok kernel:  [<ffffffff8100d039>] arch_dup_task_struct+0x69/0x170
> Sep  5 20:42:02 ragnarok kernel:  [<ffffffff8104de8f>] copy_process.part.8+0x14f/0x1760
> Sep  5 20:42:02 ragnarok kernel:  [<ffffffff8126a936>] ? security_file_alloc+0x16/0x20
> Sep  5 20:42:02 ragnarok kernel:  [<ffffffff81171c14>] ? get_empty_filp+0xd4/0x1c0
> Sep  5 20:42:02 ragnarok kernel:  [<ffffffff81185966>] ? __d_instantiate+0x96/0xf0
> Sep  5 20:42:02 ragnarok kernel:  [<ffffffff812c6b1a>] ? find_next_zero_bit+0x1a/0x30
> Sep  5 20:42:02 ragnarok kernel:  [<ffffffff8105b63f>] ? recalc_sigpending+0x1f/0x60
> Sep  5 20:42:02 ragnarok kernel:  [<ffffffff8104f657>] do_fork+0xd7/0x370
> Sep  5 20:42:02 ragnarok kernel:  [<ffffffff8105ed07>] ? sigprocmask+0x57/0x90
> Sep  5 20:42:02 ragnarok kernel:  [<ffffffff8104f976>] SyS_clone+0x16/0x20
> Sep  5 20:42:02 ragnarok kernel:  [<ffffffff81571d17>] system_call_fastpath+0x12/0x6a
> Sep  5 20:42:02 ragnarok kernel: Code: 65 4c 03 05 ee e3 ea 7e 49 83 78 10 00 4d 8b 38 0f 84 b0 00 00 00 4d 85 ff 0f 84 a7 00 00 00 49 63 45 20 48 8d 4a 01 49 8b 7d 00 <49> 8b 1c 07 4c 89 f8 65 48 0f c7 0f 0f 94 c0 84 c0 74 b9 49 63 
> Sep  5 20:42:02 ragnarok kernel: RIP  [<ffffffff8115bd4d>] kmem_cache_alloc+0x6d/0x160
> Sep  5 20:42:02 ragnarok kernel:  RSP <ffff8805b26afd88>
> Sep  5 20:42:02 ragnarok kernel: CR2: ffff8800e789b740
> Sep  5 20:42:02 ragnarok kernel: ---[ end trace e4478715791f5753 ]---
> 
> ..etc.
> 
> I also have all of
> 
> CONFIG_SLUB_DEBUG=y
> CONFIG_SLUB=y
> CONFIG_SLUB_CPU_PARTIAL=y
> 
> set.
> 
> Hope this helps somewhat.
> 
> Holger
> 
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