linux-kernel - Re: [syzbot] [gfs2?] KASAN: slab-use-after-free Write in gfs2_qd

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Message-ID: <c6a5d07d-4c00-4047-b86f-cce27177e353@redhat.com>
Date: Thu, 24 Jul 2025 13:11:05 +0100
From: Andrew Price <anprice@...hat.com>
To: syzbot <syzbot+42a37bf8045847d8f9d2@...kaller.appspotmail.com>,
 agruenba@...hat.com, gfs2@...ts.linux.dev, linux-kernel@...r.kernel.org,
 syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [gfs2?] KASAN: slab-use-after-free Write in
 gfs2_qd_dealloc (3)

On 24/07/2025 12:57, syzbot wrote:
> Hello,
> 
> syzbot has tested the proposed patch but the reproducer is still triggering an issue:
> WARNING in move_to_new_folio
> 
> ------------[ cut here ]------------
> gfs2_meta_aops does not implement migrate_folio

This is a separate issue, fixed in for-next.

Andy

> WARNING: CPU: 0 PID: 30 at mm/migrate.c:944 fallback_migrate_folio mm/migrate.c:942 [inline]
> WARNING: CPU: 0 PID: 30 at mm/migrate.c:944 move_to_new_folio+0x696/0x7a0 mm/migrate.c:996
> Modules linked in:
> CPU: 0 UID: 0 PID: 30 Comm: kcompactd1 Not tainted 6.16.0-rc7-syzkaller-g25fae0b93d1d-dirty #0 PREEMPT(full) 
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
> RIP: 0010:fallback_migrate_folio mm/migrate.c:942 [inline]
> RIP: 0010:move_to_new_folio+0x696/0x7a0 mm/migrate.c:996
> Code: 0d 01 90 42 80 7c 3d 00 00 74 0a 48 8b 7c 24 20 e8 2f 53 fe ff 48 8b 44 24 20 48 8b 30 48 c7 c7 20 bb 97 8b e8 bb b7 5e ff 90 <0f> 0b 90 90 49 bf 00 00 00 00 00 fc ff df e9 7e fd ff ff e8 62 d2
> RSP: 0018:ffffc90000516fd0 EFLAGS: 00010246
> RAX: daec11f2299abc00 RBX: ffffea000100abc0 RCX: ffff888030f88000
> RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
> RBP: 1ffff1100887b921 R08: 0000000000000003 R09: 0000000000000004
> R10: dffffc0000000000 R11: fffffbfff1bfaa6c R12: ffffea00014e3d40
> R13: ffff8880443dc7e8 R14: ffffea000100abc8 R15: dffffc0000000000
> FS:  0000000000000000(0000) GS:ffff88808d218000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007fce2e39a000 CR3: 0000000057fda000 CR4: 0000000000352ef0
> Call Trace:
>  <TASK>
>  migrate_folio_move mm/migrate.c:1301 [inline]
>  migrate_folios_move mm/migrate.c:1653 [inline]
>  migrate_pages_batch+0x1c34/0x2830 mm/migrate.c:1900
>  migrate_pages_sync mm/migrate.c:1930 [inline]
>  migrate_pages+0x1bcc/0x2930 mm/migrate.c:2039
>  compact_zone+0x23f4/0x4ad0 mm/compaction.c:2683
>  compact_node+0x1d2/0x280 mm/compaction.c:2952
>  kcompactd+0xbc8/0x1290 mm/compaction.c:3250
>  kthread+0x70e/0x8a0 kernel/kthread.c:464
>  ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
>  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
>  </TASK>
> 
> 
> Tested on:
> 
> commit:         25fae0b9 Merge tag 'drm-fixes-2025-07-24' of https://g..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=12eac0a2580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=8adfe52da0de2761
> dashboard link: https://syzkaller.appspot.com/bug?extid=42a37bf8045847d8f9d2
> compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
> patch:          https://syzkaller.appspot.com/x/patch.diff?x=118ee0a2580000
>