WARNING in ext4_journal_check

Date	Name	Commit	Repro	Result
2025/12/09	upstream (ToT)	cb015814f8b6	syz	Failed due to an error; will retry later

Date

Name

Commit

Repro

Result

2025/12/09

upstream (ToT)

cb015814f8b6

syz

Failed due to an error; will retry later

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-5.15	WARNING in ext4_journal_check_start	-1				1	434d	434d	0/3	auto-obsoleted due to no activity on 2025/01/15 23:20
upstream	WARNING in ext4_journal_check_start (2) ext4	-1	C	inconclusive	inconclusive	45	10d	424d	0/29	upstream: reported C repro on 2024/10/18 00:39
upstream	WARNING in ext4_journal_check_start ext4	-1	syz			3	552d	600d	0/29	auto-obsoleted due to no activity on 2024/08/10 22:22

------------[ cut here ]------------ WARNING: CPU: 0 PID: 2950 at fs/ext4/ext4_jbd2.c:73 ext4_journal_check_start+0x1eb/0x250 fs/ext4/ext4_jbd2.c:73 Modules linked in: CPU: 0 PID: 2950 Comm: kworker/u4:11 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: writeback wb_workfn (flush-7:7) RIP: 0010:ext4_journal_check_start+0x1eb/0x250 fs/ext4/ext4_jbd2.c:73 Code: 48 83 c4 08 41 bf e2 ff ff ff 44 89 f8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 62 d1 5b ff 41 bf fb ff ff ff eb e5 e8 55 d1 5b ff <0f> 0b eb d6 e8 4c d1 5b ff 0f 0b 43 80 7c 25 00 00 0f 85 0b ff ff RSP: 0018:ffffc9000bd16db8 EFLAGS: 00010293 RAX: ffffffff8229bf6b RBX: ffff88805e2ee000 RCX: ffff88802b9f8000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000a8e R08: ffff88805e2e0387 R09: 1ffff1100bc5c070 R10: dffffc0000000000 R11: ffffed100bc5c071 R12: dffffc0000000000 R13: 1ffff1100bc5dcc6 R14: ffff88805e2ee630 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc5e6a00218 CR3: 000000002665f000 CR4: 00000000003506f0 Call Trace: <TASK> __ext4_journal_start_sb+0x147/0x570 fs/ext4/ext4_jbd2.c:105 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_do_writepages+0xf92/0x38d0 fs/ext4/inode.c:2701 ext4_writepages+0x1a8/0x2f0 fs/ext4/inode.c:2807 do_writepages+0x3a2/0x600 mm/page-writeback.c:2575 __writeback_single_inode+0x153/0xee0 fs/fs-writeback.c:1635 writeback_sb_inodes+0x77c/0xef0 fs/fs-writeback.c:1926 __writeback_inodes_wb+0x111/0x240 fs/fs-writeback.c:1997 wb_writeback+0x464/0xba0 fs/fs-writeback.c:2107 wb_check_background_flush fs/fs-writeback.c:2177 [inline] wb_do_writeback fs/fs-writeback.c:2265 [inline] wb_workfn+0xb32/0xe20 fs/fs-writeback.c:2292 process_one_work kernel/workqueue.c:2634 [inline] process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 </TASK>

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2025/12/08 18:38	linux-6.6.y	5fa4793a2d2d	d6526ea3	.config	console log	report	syz / log			[disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)]	ci2-linux-6-6-kasan	WARNING in ext4_journal_check_start

Crashes (1):

Assets (help?)