linux-kernel - Re: [syzbot] [block?] general protection fault in bio_seg

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Message-ID: <aRducE3vsSWcznMs@kbusch-mbp>
Date: Fri, 14 Nov 2025 11:01:20 -0700
From: Keith Busch <kbusch@...nel.org>
To: syzbot <syzbot+8df17e797225d69050d4@...kaller.appspotmail.com>
Cc: axboe@...nel.dk, hch@....de, linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org, martin.petersen@...cle.com,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [block?] general protection fault in bio_seg_gap

On Thu, Nov 13, 2025 at 09:24:30PM -0800, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    ab40c92c74c6 Add linux-next specific files for 20251110
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=12e2317c580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=b4c0e7075df4bf51
> dashboard link: https://syzkaller.appspot.com/bug?extid=8df17e797225d69050d4
> compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11527084580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13e1b412580000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/63d584f3f4ab/disk-ab40c92c.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/4bb564de81d2/vmlinux-ab40c92c.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/704d37065029/bzImage-ab40c92c.xz
> mounted in repro: https://storage.googleapis.com/syzbot-assets/c9f9c8e46d00/mount_0.gz
>   fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=14ec87cd980000)
> 
> The issue was bisected to:
> 
> commit 2f6b2565d43cdb5087cac23d530cca84aa3d897e
> Author: Keith Busch <kbusch@...nel.org>
> Date:   Tue Oct 14 15:04:55 2025 +0000
> 
>     block: accumulate memory segment gaps per bio

#syz fix: block: fix merging data-less bios