From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f70.google.com (mail-pg0-f70.google.com [74.125.83.70]) by kanga.kvack.org (Postfix) with ESMTP id D5FCD6B0005 for ; Mon, 29 Jan 2018 17:26:53 -0500 (EST) Received: by mail-pg0-f70.google.com with SMTP id w186so5802981pgb.10 for ; Mon, 29 Jan 2018 14:26:53 -0800 (PST) Received: from mail.rimuhosting.com (mail.rimuhosting.com. [206.123.102.5]) by mx.google.com with ESMTP id v127si1647580pgv.669.2018.01.29.14.26.51 for ; Mon, 29 Jan 2018 14:26:52 -0800 (PST) Subject: Re: [Bug 198497] New: handle_mm_fault / xen_pmd_val / radix_tree_lookup_slot Null pointer References: <20180118135518.639141f0b0ea8bb047ab6306@linux-foundation.org> <7ba7635e-249a-9071-75bb-7874506bd2b2@redhat.com> <20180119030447.GA26245@bombadil.infradead.org> <20180119132145.GB2897@bombadil.infradead.org> <9d2ddba4-3fb3-0fb4-a058-f2cfd1b05538@redhat.com> <32ab6fd6-e3c6-9489-8163-aa73861aa71a@rimuhosting.com> <20180126194058.GA31600@bombadil.infradead.org> From: xen@randonwebstuff.com Message-ID: <9ff38687-edde-6b4e-4532-9c150f8ea647@rimuhosting.com> Date: Tue, 30 Jan 2018 11:26:42 +1300 MIME-Version: 1.0 In-Reply-To: <20180126194058.GA31600@bombadil.infradead.org> Content-Type: multipart/alternative; boundary="------------499B6FA920FF86F98D8393BB" Content-Language: en-US Sender: owner-linux-mm@kvack.org List-ID: To: Matthew Wilcox Cc: Laura Abbott , Andrew Morton , linux-mm@kvack.org, bugzilla-daemon@bugzilla.kernel.org This is a multi-part message in MIME format. --------------499B6FA920FF86F98D8393BB Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit 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 ]--- --------------499B6FA920FF86F98D8393BB Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit

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 ]--- --------------499B6FA920FF86F98D8393BB-- -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org