linux-kernel - Re: [syzbot] [mm?] BUG: corrupted list in add_to

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Message-ID: <CANp29Y6czU3c-9FhdcyjfJtWrnaHJZ4o3WyY6TUeGo7TnP0KtQ@mail.gmail.com>
Date: Wed, 16 Oct 2024 08:19:25 +0200
From: Aleksandr Nogikh <nogikh@...gle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: syzbot <syzbot+30eac43568e2b3d65728@...kaller.appspotmail.com>, 
	linmiaohe@...wei.com, linux-kernel@...r.kernel.org, linux-mm@...ck.org, 
	syzkaller-bugs@...glegroups.com, vitaly.wool@...sulko.com
Subject: Re: [syzbot] [mm?] BUG: corrupted list in add_to_unbuddied

Hi Andrew,

On Wed, Oct 16, 2024 at 12:40 AM Andrew Morton
<akpm@...ux-foundation.org> wrote:
>
> On Tue, 15 Oct 2024 07:52:25 -0700 syzbot <syzbot+30eac43568e2b3d65728@...kaller.appspotmail.com> wrote:
>
> > syzbot has found a reproducer for the following issue on:
> >
> > HEAD commit:    eca631b8fe80 Merge tag 'f2fs-6.12-rc4' of git://git.kernel..
> > git tree:       upstream
> > console output: https://syzkaller.appspot.com/x/log.txt?x=14d0845f980000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=cfbd94c114a3d407
> > dashboard link: https://syzkaller.appspot.com/bug?extid=30eac43568e2b3d65728
> > compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16df4c40580000
>
> Something seems rather wrong with the "syz repro" page.
>
>

What exactly looks wrong? :)
The repro mounts an ntfs3 disk image as the first operation, so the
compressed base64-encoded image takes quite a bit of space there.

>
>
> # https://syzkaller.appspot.com/bug?id=6b5f76b3a3783e6b1876d25b2d7a981ac0e0131f
> # See https://goo.gl/kgGztJ for information about syzkaller reproducers.
> #{"threaded":true,"repeat":true,"procs":6,"slowdown":1,"sandbox":"none","sandbox_arg":0,"tun":true,"netdev":true,"resetnet":true,"cgroups":true,"binfmt_misc":true,"close_fds":true,"usb":true,"vhci":true,"wifi":true,"ieee802154":true,"sysctl":true,"swap":true,"tmpdir":true,"segv":true}
> syz_mount_image$ntfs3(&(0x7f0000000000), &(0x7f0000000140)='./bus\x00', 0x19c6038, &(0x7f0000000180)=ANY=[], 0x1, 0x1f231, &(0x7f000003e780)="$eJzs3QmYTeUfB/D37Pu+XLvBWEO2RLLvsm+pZAvZyRalGhJRSSWpFElCQqhUEklEsi8JSZKQVEIS/2fu3JlmufOvadf7/TyPOfeee877nnu+94z5ne0ebz25edsGbRISEhKIzZAU50gGSSSJXIq9xsfGXYoNmdi/EZ3nV9ttftQreZxZcOVtoxYUXjVUa7/MfEsim+xOx09VOLwp3JT7+MW2vXoPSeg9JGHAwKEJXRO6DRw4tGu3fj0Suvce0rdsQst+PboO6ZHQe8CQHoMzvNyz38BBg0YmdB3Q3VAHDe4xZEhC1wEjE/r2GJkwdGDC0MEjE7re2rX3gISyZcsmGCqB36jd/H96CQAAAAAAAAAAAAAAAAAA4M9x6VLaoX0AAAAAAAAAAAAAAAAAAAC4TDVo3LR+OaKkPWcIQxoRhsxlCCH2L9OlXvfPZdNO8qRdoo9yRX82Sn10um/5fuf
> <and a huge amount more>
>

-- 
Aleksandr