From: xen@randonwebstuff.com
To: Matthew Wilcox <willy@infradead.org>
Cc: Laura Abbott <labbott@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, bugzilla-daemon@bugzilla.kernel.org
Subject: Re: [Bug 198497] New: handle_mm_fault / xen_pmd_val / radix_tree_lookup_slot Null pointer
Date: Tue, 30 Jan 2018 11:26:42 +1300 [thread overview]
Message-ID: <9ff38687-edde-6b4e-4532-9c150f8ea647@rimuhosting.com> (raw)
In-Reply-To: <20180126194058.GA31600@bombadil.infradead.org>
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On 27/01/18 8:40 AM, Matthew Wilcox wrote:
> On Fri, Jan 26, 2018 at 07:54:06PM +1300, xen@randomwebstuff.com wrote:
>> Re-tried with the current latest 4.14 (4.14.15).A Received the following:
>>
>> [2018-01-24 19:26:57] dev login: [44501.106868] BUG: unable to handle kernel
>> NULL pointer dereference at 00000008
>> [2018-01-25 07:47:50] [44501.106897] IP: __radix_tree_lookup+0x14/0xa0
> Please try including this patch:
>
> https://bugzilla.kernel.org/show_bug.cgi?id=198497#c7
>
> And have you had the chance to run memtest86 yet?
Added the patch at https://bugzilla.kernel.org/show_bug.cgi?id=198497#c7
After, received this stack.
Have not tried memtest86.A These are production hosts.A This has
occurred on multiple hosts.A I can only recall this occurring on 32 bit
kernels.A I cannot recall issues with other VMs not running that kernel
on the same hosts.
[ A 125.329163] Bad swp_entry: e000000
[ A 125.329202] ------------[ cut here ]------------
[ A 125.329219] WARNING: CPU: 0 PID: 4175 at mm/swap_state.c:339
lookup_swap_cache+0x140/0x160
[ A 125.329233] CPU: 0 PID: 4175 Comm: apt-show-versio Not tainted
4.14.15-rh14-20180126233810.xenU.i386-00001-g6ba70cb #1
[ A 125.329245] task: ead9a940 task.stack: e7c8c000
[ A 125.329253] EIP: lookup_swap_cache+0x140/0x160
[ A 125.329260] EFLAGS: 00010282 CPU: 0
[ A 125.329267] EAX: 00000016 EBX: 00000000 ECX: ec5289c4 EDX: 0100016d
[ A 125.329275] ESI: b6312000 EDI: e7d94ea0 EBP: e7c8de24 ESP: e7c8de0c
[ A 125.329284] A DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0069
[ A 125.329295] CR0: 80050033 CR2: b63124b0 CR3: 2718c000 CR4: 00002660
[ A 125.329308] Call Trace:
[ A 125.329323] A ? percpu_counter_add_batch+0x91/0xb0
[ A 125.329332] A swap_readahead_detect+0x66/0x2e0
[ A 125.329343] A ? radix_tree_tag_set+0x7a/0xe0
[ A 125.329352] A do_swap_page+0x1fa/0x860
[ A 125.329361] A ? __set_page_dirty_buffers+0xb1/0xe0
[ A 125.329372] A ? ext4_set_page_dirty+0x22/0x60
[ A 125.329383] A ? fault_dirty_shared_page.isra.90+0x3e/0xa0
[ A 125.329396] A ? xen_pmd_val+0x10/0x20
[ A 125.329403] A handle_mm_fault+0x6f8/0x1020
[ A 125.329414] A ? handle_irq_event_percpu+0x3c/0x50
[ A 125.329424] A __do_page_fault+0x18a/0x450
[ A 125.329432] A ? vmalloc_sync_all+0x250/0x250
[ A 125.329439] A do_page_fault+0x21/0x30
[ A 125.329449] A common_exception+0x45/0x4a
[ A 125.329456] EIP: 0xb7ce397b
[ A 125.329462] EFLAGS: 00010202 CPU: 0
[ A 125.329469] EAX: 0000052a EBX: b7d77ff4 ECX: 000004fa EDX: b6311000
[ A 125.329477] ESI: bf90eae0 EDI: b6ed4b20 EBP: bf90ea60 ESP: bf90ea20
[ A 125.329486] A DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b
[ A 125.329493] Code: 18 1f 14 c2 85 ff 0f 85 41 ff ff ff f0 ff 05 38 fb
02 c2 e9 35 ff ff ff 8d 76 00 89 44 24 04 c7 04 24 55 93 f3 c1 e8 8c e7
f5 ff <0f> ff 8b 5d f4 31 c0 8b 75 f8 8b 7d fc 89 ec 5d c3 64 ff 05 18
[ A 125.329558] ---[ end trace dd2704ca649b44ba ]---
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next prev parent reply other threads:[~2018-01-29 22:26 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-198497-27@https.bugzilla.kernel.org/>
2018-01-18 21:55 ` Andrew Morton
2018-01-18 22:18 ` Laura Abbott
2018-01-19 3:04 ` Matthew Wilcox
2018-01-19 3:14 ` xen
2018-01-19 13:21 ` Matthew Wilcox
2018-01-19 17:30 ` Laura Abbott
2018-01-26 6:54 ` xen
2018-01-26 19:40 ` Matthew Wilcox
2018-01-29 22:26 ` xen [this message]
2018-01-31 10:54 ` Matthew Wilcox
2018-01-31 23:02 ` Tetsuo Handa
2018-02-01 9:48 ` Matthew Wilcox
2018-02-09 14:47 ` Matthew Wilcox
2018-04-12 17:12 ` Andrew Morton
2018-04-12 17:28 ` Matthew Wilcox
2018-01-19 13:33 ` Matthew Wilcox
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