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Date:	Sat, 7 Sep 2013 11:31:45 +0200
From:	richard -rw- weinberger <richard.weinberger@...il.com>
To:	Ian Jeffray <ian@...fray.co.uk>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Daily oops's with 3.11

On Sat, Sep 7, 2013 at 11:08 AM, Ian Jeffray <ian@...fray.co.uk> wrote:
> All,
>
> A previously stable solid system Core2 upgraded from 3.9.2 to
> 3.11 is now showing oops's more than every 24 hours.
>
> Would appreciate any advice on how to begin to help debug this
> as it appears to be deep in areas of the kernel I'm unfamiliar
> with (I generally just tickle drivers)

First you have to find the exact release which introduced the regression.
E.g. 3.10-rcX.


> TIA,
>
> Ian.
>
>
> BUG: unable to handle kernel NULL pointer dereference at   (null)
> IP: [<c10e6b40>] drop_buffers+0x20/0xa0
> *pde = 00000000
> Oops: 0000 [#1] SMP
> Modules linked in: bttv tveeprom btcx_risc videobuf_dma_sg videobuf_core
> ahci libahci
> CPU: 0 PID: 507 Comm: kswapd0 Not tainted 3.11.0 #2
> Hardware name: System manufacturer P5KC/P5KC, BIOS 0701    07/03/2007
> task: f618a680 ti: f611e000 task.ti: f611e000
> EIP: 0060:[<c10e6b40>] EFLAGS: 00010286 CPU: 0
> EIP is at drop_buffers+0x20/0xa0
> EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: f611fd30
> ESI: f2d4df18 EDI: f700d620 EBP: f611fd28 ESP: f611fd18
>  DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
> CR0: 8005003b CR2: 00000000 CR3: 01707000 CR4: 000007d0
> Stack:
>  f611fd30 f700d620 00000000 c18d59b4 f611fd40 c10e86ea 00000000 00000000
>  00000000 c18d59b4 f611fd50 c1092157 f700d634 f611ff30 f611fde8 c109dc26
>  f611fda8 00000000 f611fe3c 00000000 f618a680 c1698480 f618a680 00000000
> Call Trace:
>  [<c10e86ea>] try_to_free_buffers+0x3a/0x90
>  [<c1092157>] try_to_release_page+0x47/0x60
>  [<c109dc26>] shrink_page_list+0x696/0x7d0
>  [<c109ceb9>] ? isolate_lru_pages.isra.47+0x49/0xd0
>  [<c109e24f>] shrink_inactive_list+0x1ef/0x350
>  [<c109e802>] shrink_lruvec+0x452/0x590
>  [<c109c89d>] ? zone_balanced+0x1d/0x30
>  [<c109ecbe>] kswapd+0x37e/0x700
>  [<c14f1639>] ? __schedule+0x1d9/0x650
>  [<c109e940>] ? shrink_lruvec+0x590/0x590
>  [<c104f8ef>] kthread+0x8f/0xa0
>  [<c14f3437>] ret_from_kernel_thread+0x1b/0x28
>  [<c104f860>] ? __kthread_parkme+0x60/0x60
> Code: 01 5b 5e 5f 5d c3 90 8d 74 26 00 55 89 e5 57 89 c7 56 53 83 ec 04 89
> 55 f0 8b 00 f6 c4 08 0f 84 81 00 00 00 8b 77 1c 89 f1 66 90 <8b> 01 f6 c4 08
> 74 0c 8b 47 04 85 c0 74 05 f0 80 48 4b 02 8b 19
> EIP: [<c10e6b40>] drop_buffers+0x20/0xa0 SS:ESP 0068:f611fd18
> CR2: 0000000000000000
> ---[ end trace 5439949abeda267a ]---
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 507 at kernel/exit.c:703 do_exit+0x37/0x860()
> Modules linked in: bttv tveeprom btcx_risc videobuf_dma_sg videobuf_core
> ahci libahci
> CPU: 0 PID: 507 Comm: kswapd0 Tainted: G      D      3.11.0 #2
> Hardware name: System manufacturer P5KC/P5KC, BIOS 0701    07/03/2007
>  00000000 00000000 f611fb34 c14eec5c 00000000 f611fb64 c1037fda c15af4a4
>  00000000 000001fb c15ad72d 000002bf c10394d7 c10394d7 00000009 00000246
>  f618a680 f611fb74 c103801d 00000009 00000000 f611fbcc c10394d7 00000000
> Call Trace:
>  [<c14eec5c>] dump_stack+0x41/0x52
>  [<c1037fda>] warn_slowpath_common+0x7a/0xa0
>  [<c10394d7>] ? do_exit+0x37/0x860
>  [<c10394d7>] ? do_exit+0x37/0x860
>  [<c103801d>] warn_slowpath_null+0x1d/0x20
>  [<c10394d7>] do_exit+0x37/0x860
>  [<c14eb9a1>] ? printk+0x38/0x3a
>  [<c1037f5a>] ? print_oops_end_marker+0x2a/0x30
>  [<c1005067>] oops_end+0x67/0x90
>  [<c14eaf9c>] no_context+0x188/0x190
>  [<c14eb26d>] __bad_area_nosemaphore+0x128/0x130
>  [<c129bd68>] ? blk_queue_bio+0x238/0x2b0
>  [<c1093e9e>] ? mempool_alloc_slab+0xe/0x10
>  [<c102f060>] ? vmalloc_sync_all+0x100/0x100
>  [<c14eb287>] bad_area_nosemaphore+0x12/0x14
>  [<c102edcd>] __do_page_fault+0x28d/0x420
>  [<c10987ec>] ? test_set_page_writeback+0x9c/0x140
>  [<c10b76ed>] ? __swap_writepage+0x13d/0x1e0
>  [<c102f060>] ? vmalloc_sync_all+0x100/0x100
>  [<c102f068>] do_page_fault+0x8/0x10
>  [<c14f3246>] error_code+0x5a/0x60
>  [<c102f060>] ? vmalloc_sync_all+0x100/0x100
>  [<c10e6b40>] ? drop_buffers+0x20/0xa0
>  [<c10e86ea>] try_to_free_buffers+0x3a/0x90
>  [<c1092157>] try_to_release_page+0x47/0x60
>  [<c109dc26>] shrink_page_list+0x696/0x7d0
>  [<c109ceb9>] ? isolate_lru_pages.isra.47+0x49/0xd0
>  [<c109e24f>] shrink_inactive_list+0x1ef/0x350
>  [<c109e802>] shrink_lruvec+0x452/0x590
>  [<c109c89d>] ? zone_balanced+0x1d/0x30
>  [<c109ecbe>] kswapd+0x37e/0x700
>  [<c14f1639>] ? __schedule+0x1d9/0x650
>  [<c109e940>] ? shrink_lruvec+0x590/0x590
>  [<c104f8ef>] kthread+0x8f/0xa0
>  [<c14f3437>] ret_from_kernel_thread+0x1b/0x28
>  [<c104f860>] ? __kthread_parkme+0x60/0x60
> ---[ end trace 5439949abeda267b ]---
> --
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-- 
Thanks,
//richard
--
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