linux-kernel - Re: [syzbot] WARNING in folio_account

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Message-ID: <000000000000f07a0e05e9bb2866@google.com>
Date:   Wed, 28 Sep 2022 04:35:38 -0700
From:   syzbot <syzbot+8d1d62bfb63d6a480be1@...kaller.appspotmail.com>
To:     agruenba@...hat.com, akpm@...ux-foundation.org,
        cluster-devel@...hat.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        rpeterso@...hat.com, syzkaller-bugs@...glegroups.com,
        willy@...radead.org
Subject: Re: [syzbot] WARNING in folio_account_dirtied

syzbot has found a reproducer for the following issue on:

HEAD commit:    46452d3786a8 Merge tag 'sound-6.0-rc8' of git://git.kernel..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=160fa19c880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ba0d23aa7e1ffaf5
dashboard link: https://syzkaller.appspot.com/bug?extid=8d1d62bfb63d6a480be1
compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1208f950880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14864e9c880000

Downloadable assets:
disk image: https://storage.googleapis.com/a6170e8216df/disk-46452d37.raw.xz
vmlinux: https://storage.googleapis.com/cbd307bfbc89/vmlinux-46452d37.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8d1d62bfb63d6a480be1@...kaller.appspotmail.com

gfs2: fsid=loop0.0: found 19 quota changes
------------[ cut here ]------------
WARNING: CPU: 1 PID: 3609 at include/linux/backing-dev.h:246 folio_account_dirtied+0x61a/0x720 mm/page-writeback.c:2564
Modules linked in:
CPU: 1 PID: 3609 Comm: syz-executor421 Not tainted 6.0.0-rc7-syzkaller-00042-g46452d3786a8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
RIP: 0010:inode_to_wb include/linux/backing-dev.h:243 [inline]
RIP: 0010:folio_account_dirtied+0x61a/0x720 mm/page-writeback.c:2564
Code: ff ff e9 6e fd ff ff e8 a4 48 d1 ff 4c 89 f7 4c 89 e6 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d e9 3b ed 2a 00 e8 86 48 d1 ff <0f> 0b 43 80 3c 3c 00 0f 85 36 fd ff ff e9 39 fd ff ff 48 c7 c1 54
RSP: 0018:ffffc90003b3f6b8 EFLAGS: 00010093
RAX: ffffffff81b640fa RBX: 0000000000000000 RCX: ffff88807c9a1d80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888012427578 R08: ffffffff81b640be R09: ffffed1002484eb0
R10: ffffed1002484eb0 R11: 1ffff11002484eaf R12: 1ffff11002484eaf
R13: 0000000000000001 R14: ffffea0001f30480 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdce840000 CR3: 0000000027af8000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __folio_mark_dirty+0x125/0x260 mm/page-writeback.c:2615
 __set_page_dirty include/linux/pagemap.h:1057 [inline]
 mark_buffer_dirty+0x253/0x550 fs/buffer.c:1105
 gfs2_unpin+0x10b/0xa20 fs/gfs2/lops.c:111
 buf_lo_after_commit+0x172/0x1d0 fs/gfs2/lops.c:747
 lops_after_commit fs/gfs2/lops.h:49 [inline]
 gfs2_log_flush+0x1179/0x26a0 fs/gfs2/log.c:1107
 do_sync+0xa3c/0xc80 fs/gfs2/quota.c:979
 gfs2_quota_sync+0x3da/0x8b0 fs/gfs2/quota.c:1322
 gfs2_sync_fs+0x49/0xb0 fs/gfs2/super.c:642
 sync_filesystem+0xe8/0x220 fs/sync.c:56
 generic_shutdown_super+0x6b/0x300 fs/super.c:474
 kill_block_super+0x79/0xd0 fs/super.c:1427
 deactivate_locked_super+0xa7/0xf0 fs/super.c:332
 cleanup_mnt+0x4ce/0x560 fs/namespace.c:1186
 task_work_run+0x146/0x1c0 kernel/task_work.c:177
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0x55e/0x20a0 kernel/exit.c:795
 do_group_exit+0x23b/0x2f0 kernel/exit.c:925
 __do_sys_exit_group kernel/exit.c:936 [inline]
 __se_sys_exit_group kernel/exit.c:934 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:934
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f8d10697139
Code: Unable to access opcode bytes at RIP 0x7f8d1069710f.
RSP: 002b:00007ffdce83f9e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f8d10745330 RCX: 00007f8d10697139
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001
RBP: 0000000000000001 R08: ffffffffffffffc0 R09: 00005555574d02c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8d10745330
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
 </TASK>