From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C7B0FC433F5 for ; Thu, 18 Nov 2021 06:21:17 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 4A40561B62 for ; Thu, 18 Nov 2021 06:21:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 4A40561B62 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id A1E096B0072; Thu, 18 Nov 2021 01:21:06 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 9CCEC6B0073; Thu, 18 Nov 2021 01:21:06 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 893E96B0074; Thu, 18 Nov 2021 01:21:06 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0056.hostedemail.com [216.40.44.56]) by kanga.kvack.org (Postfix) with ESMTP id 7AE8D6B0072 for ; Thu, 18 Nov 2021 01:21:06 -0500 (EST) Received: from smtpin12.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 30D4E852E6 for ; Thu, 18 Nov 2021 06:20:56 +0000 (UTC) X-FDA: 78821052912.12.9F79192 Received: from mail-lf1-f42.google.com (mail-lf1-f42.google.com [209.85.167.42]) by imf31.hostedemail.com (Postfix) with ESMTP id 9DAFA10529AD for ; Thu, 18 Nov 2021 06:20:54 +0000 (UTC) Received: by mail-lf1-f42.google.com with SMTP id bu18so20876042lfb.0 for ; Wed, 17 Nov 2021 22:20:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=8M3CbMHYOy/GOeVoV18AlrEBN621rBsFxoAvbwkXoiQ=; b=VM9WExKIX8oLBU8OnVN/aK7T8nuW65a/mOTqeV/YmDtH52xEKhCLNb5Aw1qkylFmOX 1oPB81bUCOvWe0+ndi4jdSOdEfCC8JVl9Jl0Md4Rs82jAQFL6mFN1/4xaw4oGmJf6BP7 v73gKTAU7hS21X/nA4/i7MD46eXM32Koa+tnZVJ7oNc5Cl5K3O7hVJ5zI9+zPibZTePX Y5QGHfn1gxRH4t+h0GCrVQnHwFbYIdS2S6WF80IffsR5PaASYVtWqmtcoYrIcjAB6rcd hI2Y3Llr6ovoavpDY+m7676MfJNAM1p6ZysXBRE9rIUo3dDCUNlNnofymQMIxxXrTigM HzXg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=8M3CbMHYOy/GOeVoV18AlrEBN621rBsFxoAvbwkXoiQ=; b=f1eA3CCkXlBZpLlq0aBSNU6sa7qmIHpSUJolyh93+BgvCtInIVf6Nm8jAKt9BQ+21C zeI1BCuoAr3/bTixG0oIDzHhhv079//7k+mY0vafgAPF6Mc0d+ac5gIN6wQDjf2PQ4UU 5pVhpLt77m1OLKStalm1jvcedMDPrHzCGh8yuzcfog9jrYm7nDWO4FaR8DkTO8iJXmAE hr5e4sorEmEjrnEEzCmMaUH6eJNOfa/kPW4uibc6VpfEmGTFAwNlC28oD0XdQ0fonhN4 pTiIeXQe1krq+vKCPqty5155CKEDHqVsOp4svi28LjWrUymJ3Kv/Paz++qdt2XPp5SHw lzOw== X-Gm-Message-State: AOAM532h3rvW7YjPYFEhPYGGnB1djQKFdNkfrSbqDpzqN6Bp29wo7lOV 739jYQjiyUC3R6PwzB7xXp9yFC7gJRpLfVx/6Jg= X-Google-Smtp-Source: ABdhPJwkIuIB0omMO/OgDP2njapPOy9U/HJ62sLBvnyLI0jmbxNVLkMqgVOR3Tz+KiP83wmNadllMLfwXhfj6S9A1jw= X-Received: by 2002:a2e:7c16:: with SMTP id x22mr14719326ljc.460.1637216454004; Wed, 17 Nov 2021 22:20:54 -0800 (PST) MIME-Version: 1.0 References: <20211118042914.wnffm3ytzmxjdubn@xzhoux.usersys.redhat.com> In-Reply-To: <20211118042914.wnffm3ytzmxjdubn@xzhoux.usersys.redhat.com> From: Steve French Date: Thu, 18 Nov 2021 00:20:42 -0600 Message-ID: Subject: Re: [regression] mm, cifs panic To: Murphy Zhou Cc: Matthew Wilcox , linux-mm , CIFS Content-Type: multipart/alternative; boundary="00000000000029542d05d10a292a" X-Rspamd-Queue-Id: 9DAFA10529AD X-Stat-Signature: n8fpy5gjjaefubwa4unhwb9hxzzmin95 Authentication-Results: imf31.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=VM9WExKI; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (imf31.hostedemail.com: domain of smfrench@gmail.com designates 209.85.167.42 as permitted sender) smtp.mailfrom=smfrench@gmail.com X-Rspamd-Server: rspam02 X-HE-Tag: 1637216454-731353 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: --00000000000029542d05d10a292a Content-Type: text/plain; charset="UTF-8" Andrew Morton reposted a Matthew Wilcox patch for this that was sent on November 9th to fsdevel. Which worked for me but I don't see it upstream yet On Thu, Nov 18, 2021, 00:13 Murphy Zhou wrote: > Hi Matthew, > > Since this commit > [988c69f1bc23fe632ea5e6eb3c26a9e103c3ed41] mm: optimise > put_pages_list() > > Always, xfstests[1] sub-testcase generic/340 on CIFS v3.11 can trigger > kernel panic like this: > > [ 2001.250571] run fstests generic/340 at 2021-11-14 20:23:26 > [ 2001.392289] cifs_smb3_do_mount: 12 callbacks suppressed > [ 2001.392295] CIFS: Attempting to mount \\ > dell-per730-01.dell2.lab.eng.bos.redhat.com\SCRATCH_dev > [ 2001.420684] CIFS: Attempting to mount \\ > dell-per730-01.dell2.lab.eng.bos.redhat.com\SCRATCH_dev > [ 2001.438960] Attempt to set a LOCK_MAND lock via flock(2). This support > has been removed and the request ignored. > [ 2001.451621] ------------[ cut here ]------------ > [ 2001.456796] kernel BUG at mm/readahead.c:151! > [ 2001.461664] invalid opcode: 0000 [#1] PREEMPT SMP PTI > [ 2001.467301] CPU: 6 PID: 531974 Comm: holetest Kdump: loaded Not tainted > 5.16.0-rc1 #1 > [ 2001.476038] Hardware name: Dell Inc. PowerEdge R730/0599V5, BIOS 2.11.0 > 11/02/2019 > [ 2001.484483] RIP: 0010:read_pages+0x228/0x240 > [ 2001.489250] Code: eb 87 48 8b 07 48 c1 e8 33 83 e0 07 83 f8 04 75 e4 48 > 8b 47 08 8b 40 68 83 e8 01 83 f8 01 77 d5 e8 1d 19 00 00 e9 5f ff ff ff > <0f> 0b 0f 0b e8 2f 42 81 00 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f > [ 2001.510203] RSP: 0000:ffffb79227757bd8 EFLAGS: 00010293 > [ 2001.516033] RAX: ffffea3310273dc8 RBX: ffffb79227757cc0 RCX: > ffffb79227757bf0 > [ 2001.523993] RDX: ffffb79227757c70 RSI: 0000000000000000 RDI: > ffffb79227757bd8 > [ 2001.531953] RBP: ffffb79227757c70 R08: ffffea330d3a0888 R09: > ffffea330d3a0888 > [ 2001.539913] R10: 0000000000000000 R11: 0000000000000000 R12: > 0000000000000000 > [ 2001.547873] R13: ffffffffc0ca3560 R14: ffffea3310273dc0 R15: > ffffea3310273dc8 > [ 2001.555834] FS: 00007f2e20c13640(0000) GS:ffff8d7567cc0000(0000) > knlGS:0000000000000000 > [ 2001.564862] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 2001.571272] CR2: 00007f2e20c14c00 CR3: 000000037a0fa006 CR4: > 00000000001706e0 > [ 2001.579233] Call Trace: > [ 2001.581959] > [ 2001.584298] page_cache_ra_unbounded+0x1d9/0x260 > [ 2001.589450] do_sync_mmap_readahead+0x115/0x1a0 > [ 2001.594506] filemap_fault+0x416/0x7b0 > [ 2001.598688] __do_fault+0x36/0x110 > [ 2001.602483] do_fault+0x130/0x2b0 > [ 2001.606178] __handle_mm_fault+0x396/0x6f0 > [ 2001.610747] handle_mm_fault+0xc5/0x290 > [ 2001.615025] do_user_addr_fault+0x1c3/0x680 > [ 2001.619694] exc_page_fault+0x62/0x140 > [ 2001.623867] ? asm_exc_page_fault+0x8/0x30 > [ 2001.628437] asm_exc_page_fault+0x1e/0x30 > [ 2001.632908] RIP: 0033:0x40192f > [ 2001.636311] Code: ff 48 89 c3 48 8b 05 50 28 00 00 48 85 ed 7e 23 31 d2 > 4b 8d 0c 2f eb 0a 0f 1f 00 48 8b 05 39 28 00 00 48 0f af c2 48 83 c2 01 > <48> 89 1c 01 48 39 d5 7f e8 8b 0d f2 27 00 00 31 c0 85 c9 74 0e 8b > [ 2001.657265] RSP: 002b:00007f2e20c12e10 EFLAGS: 00010202 > [ 2001.663093] RAX: 0000000000000000 RBX: 00007f2e20c13640 RCX: > 00007f2e20c14c00 > [ 2001.671053] RDX: 0000000000000001 RSI: 00007f2e20c13f30 RDI: > 00007ffea1e626f0 > [ 2001.679014] RBP: 0000000000000100 R08: 0000000000000000 R09: > 00007ffea1e6256f > [ 2001.686975] R10: 0000000000000008 R11: 0000000000000246 R12: > 00007ffea1e626f0 > [ 2001.694935] R13: 0000000000000c00 R14: 00007f2e20dae860 R15: > 00007f2e20c14000 > [ 2001.702898] > > > It's a mmap writing race testcase. > > Bisect log is attached. Reverting this commit makes the panic go away. > > > Thanks, > Murphy > > [1] https://git.kernel.org/pub/scm/fs/xfs/xfstests-dev.git > [2] git bisect log > git bisect start > # good: [a602285ac11b019e9ce7c3907328e9f95f4967f0] Merge branch > 'per_signal_struct_coredumps-for-v5.16' of git:// > git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace > git bisect good a602285ac11b019e9ce7c3907328e9f95f4967f0 > # bad: [00f178e15095fbcf04db00486378a6fa416a125e] Merge tag > 'xtensa-20211105' of git://github.com/jcmvbkbc/linux-xtensa > git bisect bad 00f178e15095fbcf04db00486378a6fa416a125e > # good: [5cd4dc44b8a0f656100e3b6916cf73b1623299eb] Merge tag > 'staging-5.16-rc1' of git:// > git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging > git bisect good 5cd4dc44b8a0f656100e3b6916cf73b1623299eb > # good: [5a1bcbd965341537c354e3682f939a7274ac3f5d] Merge tag > 'pinctrl-v5.16-1' of git:// > git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl > git bisect good 5a1bcbd965341537c354e3682f939a7274ac3f5d > # good: [fe91c4725aeed35023ba4f7a1e1adfebb6878c23] Merge tag 'scsi-misc' > of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi > git bisect good fe91c4725aeed35023ba4f7a1e1adfebb6878c23 > # bad: [a460a36034bad4403c2c62e04a521bc6987ae5db] mm/damon: remove > unnecessary variable initialization > git bisect bad a460a36034bad4403c2c62e04a521bc6987ae5db > # bad: [9871e2ded6c1ff61a59988d7a0e975f012105d52] mm/cma: add > cma_pages_valid to determine if pages are in CMA > git bisect bad 9871e2ded6c1ff61a59988d7a0e975f012105d52 > # bad: [642688681133a501d149349ba1a824204f3540e1] mm: memcontrol: remove > kmemcg_id reparenting > git bisect bad 642688681133a501d149349ba1a824204f3540e1 > # good: [d73dad4eb5ad8c31ac9cf358eb5a55825bafe706] kasan: test: bypass > __alloc_size checks > git bisect good d73dad4eb5ad8c31ac9cf358eb5a55825bafe706 > # good: [efee17134ca464639a2f5b4d036ce40caf1b247a] mm: simplify bdi > refcounting > git bisect good efee17134ca464639a2f5b4d036ce40caf1b247a > # bad: [48384b0b76f3662dfa6153c1072c2b936fc14627] mm/memcg: drop > swp_entry_t* in mc_handle_file_pte() > git bisect bad 48384b0b76f3662dfa6153c1072c2b936fc14627 > # good: [20b7fee738d65e50ca00e325ae27ee3efaa819f6] mm/gup: further > simplify __gup_device_huge() > git bisect good 20b7fee738d65e50ca00e325ae27ee3efaa819f6 > # good: [642929a2ded029aac13b8cb91bc9b7c088ddb57f] mm/swapfile: fix an > integer overflow in swap_show() > git bisect good 642929a2ded029aac13b8cb91bc9b7c088ddb57f > # bad: [988c69f1bc23fe632ea5e6eb3c26a9e103c3ed41] mm: optimise > put_pages_list() > git bisect bad 988c69f1bc23fe632ea5e6eb3c26a9e103c3ed41 > # first bad commit: [988c69f1bc23fe632ea5e6eb3c26a9e103c3ed41] mm: > optimise put_pages_list() > --00000000000029542d05d10a292a Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Andrew Morton reposted a Matthew Wilcox patch for this th= at was sent on November 9th to fsdevel. Which worked for me but I don't= see it upstream yet

On Thu, Nov 18, 2021, 00:13 Murphy Zhou <jencce.kernel@gmail.com> wrote:
<= /div>
Hi Matthew,

Since this commit
=C2=A0 =C2=A0 =C2=A0 =C2=A0 [988c69f1bc23fe632ea5e6eb3c26a9e103c3ed41] mm: = optimise put_pages_list()

Always, xfstests[1] sub-testcase generic/340 on CIFS v3.11 can trigger
kernel panic like this:

[ 2001.250571] run fstests generic/340 at 2021-11-14 20:23:26
[ 2001.392289] cifs_smb3_do_mount: 12 callbacks suppressed
[ 2001.392295] CIFS: Attempting to mount \\dell-per730-01.dell2.lab.eng.bos.redhat.com\SCRATCH_dev
[ 2001.420684] CIFS: Attempting to mount \\dell-per730-01.dell2.lab.eng.bos.redhat.com\SCRATCH_dev
[ 2001.438960] Attempt to set a LOCK_MAND lock via flock(2). This support h= as been removed and the request ignored.
[ 2001.451621] ------------[ cut here ]------------
[ 2001.456796] kernel BUG at mm/readahead.c:151!
[ 2001.461664] invalid opcode: 0000 [#1] PREEMPT SMP PTI
[ 2001.467301] CPU: 6 PID: 531974 Comm: holetest Kdump: loaded Not tainted = 5.16.0-rc1 #1
[ 2001.476038] Hardware name: Dell Inc. PowerEdge R730/0599V5, BIOS 2.11.0 = 11/02/2019
[ 2001.484483] RIP: 0010:read_pages+0x228/0x240
[ 2001.489250] Code: eb 87 48 8b 07 48 c1 e8 33 83 e0 07 83 f8 04 75 e4 48 = 8b 47 08 8b 40 68 83 e8 01 83 f8 01 77 d5 e8 1d 19 00 00 e9 5f ff ff ff <= ;0f> 0b 0f 0b e8 2f 42 81 00 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f
[ 2001.510203] RSP: 0000:ffffb79227757bd8 EFLAGS: 00010293
[ 2001.516033] RAX: ffffea3310273dc8 RBX: ffffb79227757cc0 RCX: ffffb792277= 57bf0
[ 2001.523993] RDX: ffffb79227757c70 RSI: 0000000000000000 RDI: ffffb792277= 57bd8
[ 2001.531953] RBP: ffffb79227757c70 R08: ffffea330d3a0888 R09: ffffea330d3= a0888
[ 2001.539913] R10: 0000000000000000 R11: 0000000000000000 R12: 00000000000= 00000
[ 2001.547873] R13: ffffffffc0ca3560 R14: ffffea3310273dc0 R15: ffffea33102= 73dc8
[ 2001.555834] FS:=C2=A0 00007f2e20c13640(0000) GS:ffff8d7567cc0000(0000) k= nlGS:0000000000000000
[ 2001.564862] CS:=C2=A0 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2001.571272] CR2: 00007f2e20c14c00 CR3: 000000037a0fa006 CR4: 00000000001= 706e0
[ 2001.579233] Call Trace:
[ 2001.581959]=C2=A0 <TASK>
[ 2001.584298]=C2=A0 page_cache_ra_unbounded+0x1d9/0x260
[ 2001.589450]=C2=A0 do_sync_mmap_readahead+0x115/0x1a0
[ 2001.594506]=C2=A0 filemap_fault+0x416/0x7b0
[ 2001.598688]=C2=A0 __do_fault+0x36/0x110
[ 2001.602483]=C2=A0 do_fault+0x130/0x2b0
[ 2001.606178]=C2=A0 __handle_mm_fault+0x396/0x6f0
[ 2001.610747]=C2=A0 handle_mm_fault+0xc5/0x290
[ 2001.615025]=C2=A0 do_user_addr_fault+0x1c3/0x680
[ 2001.619694]=C2=A0 exc_page_fault+0x62/0x140
[ 2001.623867]=C2=A0 ? asm_exc_page_fault+0x8/0x30
[ 2001.628437]=C2=A0 asm_exc_page_fault+0x1e/0x30
[ 2001.632908] RIP: 0033:0x40192f
[ 2001.636311] Code: ff 48 89 c3 48 8b 05 50 28 00 00 48 85 ed 7e 23 31 d2 = 4b 8d 0c 2f eb 0a 0f 1f 00 48 8b 05 39 28 00 00 48 0f af c2 48 83 c2 01 <= ;48> 89 1c 01 48 39 d5 7f e8 8b 0d f2 27 00 00 31 c0 85 c9 74 0e 8b
[ 2001.657265] RSP: 002b:00007f2e20c12e10 EFLAGS: 00010202
[ 2001.663093] RAX: 0000000000000000 RBX: 00007f2e20c13640 RCX: 00007f2e20c= 14c00
[ 2001.671053] RDX: 0000000000000001 RSI: 00007f2e20c13f30 RDI: 00007ffea1e= 626f0
[ 2001.679014] RBP: 0000000000000100 R08: 0000000000000000 R09: 00007ffea1e= 6256f
[ 2001.686975] R10: 0000000000000008 R11: 0000000000000246 R12: 00007ffea1e= 626f0
[ 2001.694935] R13: 0000000000000c00 R14: 00007f2e20dae860 R15: 00007f2e20c= 14000
[ 2001.702898]=C2=A0 </TASK>


It's a mmap writing race testcase.

Bisect log is attached. Reverting this commit makes the panic go away.


Thanks,
Murphy

[1] https://git.kernel.org/pub/scm= /fs/xfs/xfstests-dev.git
[2] git bisect log
git bisect start
# good: [a602285ac11b019e9ce7c3907328e9f95f4967f0] Merge branch 'per_si= gnal_struct_coredumps-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm= /user-namespace
git bisect good a602285ac11b019e9ce7c3907328e9f95f4967f0
# bad: [00f178e15095fbcf04db00486378a6fa416a125e] Merge tag 'xtensa-202= 11105' of git://github.com/jcmvbkbc/linux-xten= sa
git bisect bad 00f178e15095fbcf04db00486378a6fa416a125e
# good: [5cd4dc44b8a0f656100e3b6916cf73b1623299eb] Merge tag 'staging-5= .16-rc1' of git://git.ke= rnel.org/pub/scm/linux/kernel/git/gregkh/staging
git bisect good 5cd4dc44b8a0f656100e3b6916cf73b1623299eb
# good: [5a1bcbd965341537c354e3682f939a7274ac3f5d] Merge tag 'pinctrl-v= 5.16-1' of git://g= it.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl
git bisect good 5a1bcbd965341537c354e3682f939a7274ac3f5d
# good: [fe91c4725aeed35023ba4f7a1e1adfebb6878c23] Merge tag 'scsi-misc= ' of git://git.kernel.org/pub= /scm/linux/kernel/git/jejb/scsi
git bisect good fe91c4725aeed35023ba4f7a1e1adfebb6878c23
# bad: [a460a36034bad4403c2c62e04a521bc6987ae5db] mm/damon: remove unnecess= ary variable initialization
git bisect bad a460a36034bad4403c2c62e04a521bc6987ae5db
# bad: [9871e2ded6c1ff61a59988d7a0e975f012105d52] mm/cma: add cma_pages_val= id to determine if pages are in CMA
git bisect bad 9871e2ded6c1ff61a59988d7a0e975f012105d52
# bad: [642688681133a501d149349ba1a824204f3540e1] mm: memcontrol: remove km= emcg_id reparenting
git bisect bad 642688681133a501d149349ba1a824204f3540e1
# good: [d73dad4eb5ad8c31ac9cf358eb5a55825bafe706] kasan: test: bypass __al= loc_size checks
git bisect good d73dad4eb5ad8c31ac9cf358eb5a55825bafe706
# good: [efee17134ca464639a2f5b4d036ce40caf1b247a] mm: simplify bdi refcoun= ting
git bisect good efee17134ca464639a2f5b4d036ce40caf1b247a
# bad: [48384b0b76f3662dfa6153c1072c2b936fc14627] mm/memcg: drop swp_entry_= t* in mc_handle_file_pte()
git bisect bad 48384b0b76f3662dfa6153c1072c2b936fc14627
# good: [20b7fee738d65e50ca00e325ae27ee3efaa819f6] mm/gup: further simplify= __gup_device_huge()
git bisect good 20b7fee738d65e50ca00e325ae27ee3efaa819f6
# good: [642929a2ded029aac13b8cb91bc9b7c088ddb57f] mm/swapfile: fix an inte= ger overflow in swap_show()
git bisect good 642929a2ded029aac13b8cb91bc9b7c088ddb57f
# bad: [988c69f1bc23fe632ea5e6eb3c26a9e103c3ed41] mm: optimise put_pages_li= st()
git bisect bad 988c69f1bc23fe632ea5e6eb3c26a9e103c3ed41
# first bad commit: [988c69f1bc23fe632ea5e6eb3c26a9e103c3ed41] mm: optimise= put_pages_list()
--00000000000029542d05d10a292a--