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[82.31.203.200]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3b76fc6055dsm2054443f8f.7.2025.07.24.05.11.05 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 24 Jul 2025 05:11:05 -0700 (PDT) Message-ID: Date: Thu, 24 Jul 2025 13:11:05 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [gfs2?] KASAN: slab-use-after-free Write in gfs2_qd_dealloc (3) Content-Language: en-US To: syzbot , agruenba@redhat.com, gfs2@lists.linux.dev, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com References: <68821f8f.a00a0220.2f88df.0024.GAE@google.com> From: Andrew Price In-Reply-To: <68821f8f.a00a0220.2f88df.0024.GAE@google.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit 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: > > 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 > > > > 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 >