linux-kernel - Re: Fwd: f2fs write error Linux v6.2

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Date:   Fri, 30 Dec 2022 06:56:36 +0100
From:   Thorsten Leemhuis <regressions@...mhuis.info>
To:     Jeff Chua <jeff.chua.linux@...il.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Bagas Sanjaya <bagasdotme@...il.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>,
        F2FS Development <linux-f2fs-devel@...ts.sourceforge.net>,
        Linux Regressions <regressions@...ts.linux.dev>
Subject: Re: Fwd: f2fs write error Linux v6.2

On 30.12.22 05:04, Jeff Chua wrote:
> On 12/24/22 19:43, Bagas Sanjaya wrote:
>> On Sat, Dec 24, 2022 at 01:48:55PM +0800, Jeff Chua wrote:
>>> Got the following error in latest linux-6.2-git with just vim (:w
>>> file1). No problem with linux-6.1.1
> 
> What happened to the f2fs developers? No response from anyone yet.

Well, that indeed is unfortunate and ideally shouldn't happen, but the
simple reality is: that can happen this time of the year due to this
thing called "festive season".

> Am
> I the only one facing this? Linux-6.2 is unusable until this is fixed.
> What can I do to help?

The usual: bisect the issue, as then (a) we know exactly which developer
caused it, (b) which subsystem/maintainer is responsible (issues in a fs
might be caused by the VFS, block layer, mm, ...), and (c) might be able
to quickly revert that culprit, even if the people normally responsible
are MIA for some reason.

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)

P.S.: As the Linux kernel's regression tracker I deal with a lot of
reports and sometimes miss something important when writing mails like
this. If that's the case here, don't hesitate to tell me in a public
reply, it's in everyone's interest to set the public record straight.

>>> 2022-12-22T14:09:51.419409+08:00 [localhost] kernel: BUG: kernel NULL
>>> pointer dereference, address: 0000000000000024
>>> 2022-12-22T14:09:51.419422+08:00 [localhost] kernel: #PF: supervisor
>>> write access in kernel mode
>>> 2022-12-22T14:09:51.419423+08:00 [localhost] kernel: #PF:
>>> error_code(0x0002) - not-present page
>>> 2022-12-22T14:09:51.419424+08:00 [localhost] kernel: PGD 147b63067 P4D
>>> 147b63067 PUD 177d5c067 PMD 0
>>> 2022-12-22T14:09:51.419424+08:00 [localhost] kernel: Oops: 0002 [#7] PREEMPT SMP
>>> 2022-12-22T14:09:51.419428+08:00 [localhost] kernel: CPU: 6 PID: 22891
>>> Comm: vi Tainted: G     UD            6.1.0 #11
>>> 2022-12-22T14:09:51.419428+08:00 [localhost] kernel: Hardware name:
>>> LENOVO 21CCS1GL00/21CCS1GL00, BIOS N3AET69W (1.34 ) 12/05/2022
>>> 2022-12-22T14:09:51.419428+08:00 [localhost] kernel: RIP:
>>> 0010:f2fs_issue_flush+0x10e/0x180
>>> 2022-12-22T14:09:51.419429+08:00 [localhost] kernel: Code: ba 01 00 00
>>> 00 be 03 00 00 00 e8 ad e8 d5 ff 48 83 3b 00 74 1e 48 89 e7 e8 7f c1
>>> 84 00 f0 ff 4b 24 8b 44 24 2c e9 66 ff ff ff <f0> ff 43 24 e9 4a ff ff
>>> ff 45 31 ff 4c 87 7b 28 4d 85 ff 74 d6 44
>>> 2022-12-22T14:09:51.419429+08:00 [localhost] kernel: RSP:
>>> 0018:ffffc90000b13df0 EFLAGS: 00010246
>>> 2022-12-22T14:09:51.419430+08:00 [localhost] kernel: RAX:
>>> ffff888101caccc0 RBX: 0000000000000000 RCX: 0000000000000000
>>> 2022-12-22T14:09:51.419430+08:00 [localhost] kernel: RDX:
>>> 0000000010000088 RSI: 000000000005a844 RDI: ffff8881027bf000
>>> 2022-12-22T14:09:51.419431+08:00 [localhost] kernel: RBP:
>>> ffff8881027bf000 R08: 0000000000000000 R09: ffff8881027bf2a8
>>> 2022-12-22T14:09:51.419431+08:00 [localhost] kernel: R10:
>>> 0000000000000000 R11: 0000000000000000 R12: 0000000000000024
>>> 2022-12-22T14:09:51.419432+08:00 [localhost] kernel: R13:
>>> 000000000005a844 R14: 000000000005a844 R15: 0000000000000000
>>> 2022-12-22T14:09:51.419432+08:00 [localhost] kernel: FS:
>>> 00007ff03fdf0b80(0000) GS:ffff88883f380000(0000)
>>> knlGS:0000000000000000
>>> 2022-12-22T14:09:51.419432+08:00 [localhost] kernel: CS:  0010 DS:
>>> 0000 ES: 0000 CR0: 0000000080050033
>>> 2022-12-22T14:09:51.419433+08:00 [localhost] kernel: CR2:
>>> 0000000000000024 CR3: 000000013d64e006 CR4: 0000000000770ee0
>>> 2022-12-22T14:09:51.419433+08:00 [localhost] kernel: PKRU: 55555554
>>> 2022-12-22T14:09:51.419434+08:00 [localhost] kernel: Call Trace:
>>> 2022-12-22T14:09:51.419434+08:00 [localhost] kernel: <TASK>
>>> 2022-12-22T14:09:51.419435+08:00 [localhost] kernel: ?
>>> preempt_count_add+0x63/0x90
>>> 2022-12-22T14:09:51.419435+08:00 [localhost] kernel: ?
>>> preempt_count_add+0x63/0x90
>>> 2022-12-22T14:09:51.419435+08:00 [localhost] kernel: ?
>>> preempt_count_add+0x63/0x90
>>> 2022-12-22T14:09:51.419436+08:00 [localhost] kernel:
>>> f2fs_do_sync_file+0x489/0x650
>>> 2022-12-22T14:09:51.419436+08:00 [localhost] kernel: __x64_sys_fsync+0x2f/0x60
>>> 2022-12-22T14:09:51.419437+08:00 [localhost] kernel: do_syscall_64+0x35/0x80
>>> 2022-12-22T14:09:51.419437+08:00 [localhost] kernel:
>>> entry_SYSCALL_64_after_hwframe+0x46/0xb0
>>> 2022-12-22T14:09:51.419438+08:00 [localhost] kernel: RIP: 0033:0x7ff03feef20b
>>> 2022-12-22T14:09:51.419438+08:00 [localhost] kernel: Code: 3d 00 f0 ff
>>> ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c 24 0c e8 a3 a2 f8
>>> ff 8b 7c 24 0c 41 89 c0 b8 4a 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35
>>> 44 89 c7 89 44 24 0c e8 01 a3 f8 ff 8b 44
>>> 2022-12-22T14:09:51.419438+08:00 [localhost] kernel: RSP:
>>> 002b:00007ffe6ecca530 EFLAGS: 00000293 ORIG_RAX: 000000000000004a
>>> 2022-12-22T14:09:51.419439+08:00 [localhost] kernel: RAX:
>>> ffffffffffffffda RBX: 0000000000000001 RCX: 00007ff03feef20b
>>> 2022-12-22T14:09:51.419439+08:00 [localhost] kernel: RDX:
>>> 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000003
>>> 2022-12-22T14:09:51.419440+08:00 [localhost] kernel: RBP:
>>> 0000000000002000 R08: 0000000000000000 R09: 00000000024bcfb0
>>> 2022-12-22T14:09:51.419440+08:00 [localhost] kernel: R10:
>>> fffffffffffff4bf R11: 0000000000000293 R12: 00000000000006b7
>>> 2022-12-22T14:09:51.419440+08:00 [localhost] kernel: R13:
>>> 000000000000003d R14: 0000000000000000 R15: 00000000024a1680
>>> 2022-12-22T14:09:51.419441+08:00 [localhost] kernel: </TASK>
>>> 2022-12-22T14:09:51.419441+08:00 [localhost] kernel: Modules linked
>>> in: [last unloaded: ecc]
>>> 2022-12-22T14:09:51.419442+08:00 [localhost] kernel: CR2: 0000000000000024
>>> 2022-12-22T14:09:51.419442+08:00 [localhost] kernel: ---[ end trace
>>> 0000000000000000 ]---
>>> 2022-12-22T14:09:51.419443+08:00 [localhost] kernel: RIP:
>>> 0010:f2fs_issue_flush+0x10e/0x180
>>> 2022-12-22T14:09:51.419443+08:00 [localhost] kernel: Code: ba 01 00 00
>>> 00 be 03 00 00 00 e8 ad e8 d5 ff 48 83 3b 00 74 1e 48 89 e7 e8 7f c1
>>> 84 00 f0 ff 4b 24 8b 44 24 2c e9 66 ff ff ff <f0> ff 43 24 e9 4a ff ff
>>> ff 45 31 ff 4c 87 7b 28 4d 85 ff 74 d6 44
>>> 2022-12-22T14:09:51.419443+08:00 [localhost] kernel: RSP:
>>> 0018:ffffc90003903df0 EFLAGS: 00010246
>>> 2022-12-22T14:09:51.419444+08:00 [localhost] kernel: RAX:
>>> ffff888100106d80 RBX: 0000000000000000 RCX: 0000000000000000
>>> 2022-12-22T14:09:51.419444+08:00 [localhost] kernel: RDX:
>>> 0000000010000088 RSI: 0000000000b0e2ba RDI: ffff888116227000
>>> 2022-12-22T14:09:51.419445+08:00 [localhost] kernel: RBP:
>>> ffff888116227000 R08: 0000000000000000 R09: ffff8881162272a8
>>> 2022-12-22T14:09:51.419445+08:00 [localhost] kernel: R10:
>>> 0000000000000000 R11: 0000000000000000 R12: 0000000000000024
>>> 2022-12-22T14:09:51.419445+08:00 [localhost] kernel: R13:
>>> 0000000000b0e2ba R14: 0000000000b0e2ba R15: 0000000000000000
>>> 2022-12-22T14:09:51.419446+08:00 [localhost] kernel: FS:
>>> 00007ff03fdf0b80(0000) GS:ffff88883f380000(0000)
>>> knlGS:0000000000000000
>>> 2022-12-22T14:09:51.419446+08:00 [localhost] kernel: CS:  0010 DS:
>>> 0000 ES: 0000 CR0: 0000000080050033
>>> 2022-12-22T14:09:51.419446+08:00 [localhost] kernel: CR2:
>>> 0000000000000024 CR3: 000000013d64e006 CR4: 0000000000770ee0
>>> 2022-12-22T14:09:51.419447+08:00 [localhost] kernel: PKRU: 55555554
>>
>> Thanks for the report! I'm adding this to regzbot:
>>
>> #regzbot ^introduced v6.1.1..v6.2
>> #regzbot title f2fs: kernel NULL pointer dereference when writing file
>>
> 
> Oops, I mean:
> 
> #regzbot introduced v6.1.1..72a85e2b0a1e1e
> 
> Also, Cc'ed other F2FS maintainers and relevant lists.
> 
> Thanks.
> 
> --
> An old man doll... just what I always wanted! - Clara
> 
>