------------[ cut here ]------------
WARNING: CPU: 0 PID: 1079 at fs/ext4/ext4_jbd2.c:78 ext4_journal_check_start+0x24e/0x2a0 fs/ext4/ext4_jbd2.c:78
Modules linked in:
CPU: 0 UID: 0 PID: 1079 Comm: kworker/u4:9 Not tainted 6.14.0-syzkaller-10514-g7f2ff7b62617 #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
Workqueue: writeback wb_workfn (flush-7:0)
RIP: 0010:ext4_journal_check_start+0x24e/0x2a0 fs/ext4/ext4_jbd2.c:78
Code: 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc e8 ca 5b 49 ff bb fb ff ff ff eb e4 e8 be 5b 49 ff 90 0f 0b 90 eb d4 e8 b3 5b 49 ff 90 <0f> 0b 90 43 80 7c 25 00 00 0f 85 03 ff ff ff e9 06 ff ff ff 89 d9
RSP: 0018:ffffc9000269eb00 EFLAGS: 00010293
RAX: ffffffff827a0f3d RBX: 0000000000000004 RCX: ffff88800025c880
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000004
RBP: 0000000000000001 R08: ffffffff827a0e3a R09: 1ffff11008333070
R10: dffffc0000000000 R11: ffffed1008333071 R12: dffffc0000000000
R13: 1ffff11008333cc7 R14: ffff88804199e000 R15: ffff88804199e638
FS:  0000000000000000(0000) GS:ffff88808c5b7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200001000000 CR3: 0000000052f56000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __ext4_journal_start_sb+0x181/0x600 fs/ext4/ext4_jbd2.c:107
 __ext4_journal_start fs/ext4/ext4_jbd2.h:242 [inline]
 ext4_do_writepages+0x1183/0x3e50 fs/ext4/inode.c:2719
 ext4_writepages+0x26f/0x450 fs/ext4/inode.c:2826
 do_writepages+0x36a/0x890 mm/page-writeback.c:2687
 __writeback_single_inode+0x14f/0x10d0 fs/fs-writeback.c:1680
 writeback_sb_inodes+0x822/0x1360 fs/fs-writeback.c:1976
 __writeback_inodes_wb+0x11b/0x260 fs/fs-writeback.c:2047
 wb_writeback+0x429/0xb90 fs/fs-writeback.c:2158
 wb_check_background_flush fs/fs-writeback.c:2228 [inline]
 wb_do_writeback fs/fs-writeback.c:2316 [inline]
 wb_workfn+0xc73/0x10b0 fs/fs-writeback.c:2343
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319
 worker_thread+0x870/0xd50 kernel/workqueue.c:3400
 kthread+0x7b7/0x940 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>