------------[ cut here ]------------
sb_rdonly(sb)
WARNING: fs/ext4/ext4_jbd2.c:75 at ext4_journal_check_start+0x24f/0x2b0 fs/ext4/ext4_jbd2.c:75, CPU#1: syz.4.163/7290
Modules linked in:
CPU: 1 UID: 0 PID: 7290 Comm: syz.4.163 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:ext4_journal_check_start+0x24f/0x2b0 fs/ext4/ext4_jbd2.c:75
Code: 5b 41 5c 41 5d 41 5e 41 5f 5d e9 4c a0 cc 08 cc e8 d6 16 4b ff 41 bf fb ff ff ff eb e0 e8 c9 16 4b ff eb d3 e8 c2 16 4b ff 90 <0f> 0b 90 eb c8 e8 b7 16 4b ff 90 0f 0b 90 43 80 7c 25 00 00 0f 85
RSP: 0018:ffffc90005147798 EFLAGS: 00010287
RAX: ffffffff827ab16e RBX: ffff888034cee000 RCX: 0000000000080000
RDX: ffffc9000f8a3000 RSI: 0000000000001732 RDI: 0000000000001733
RBP: 0000000000000370 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed10069db081 R12: dffffc0000000000
R13: 1ffff1100699dd03 R14: ffff888034cee818 R15: 0000000000000001
FS:  00007f96213e56c0(0000) GS:ffff888125d46000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9618fa5fd2 CR3: 000000005f756000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __ext4_journal_start_sb+0x147/0x5d0 fs/ext4/ext4_jbd2.c:107
 ext4_sample_last_mounted fs/ext4/file.c:880 [inline]
 ext4_file_open+0x770/0xab0 fs/ext4/file.c:912
 do_dentry_open+0x849/0x1420 fs/open.c:947
 vfs_open+0x3b/0x350 fs/open.c:1052
 do_open fs/namei.c:4700 [inline]
 path_openat+0x2e60/0x3850 fs/namei.c:4863
 do_file_open+0x23e/0x4a0 fs/namei.c:4892
 do_sys_openat2+0x115/0x200 fs/open.c:1368
 do_sys_open fs/open.c:1374 [inline]
 __do_sys_open fs/open.c:1382 [inline]
 __se_sys_open fs/open.c:1378 [inline]
 __x64_sys_open+0x11e/0x150 fs/open.c:1378
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f96231ae0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f96213e5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f9623436090 RCX: 00007f96231ae0d9
RDX: 00000000000000f3 RSI: 0000000000000000 RDI: 0000200000000040
RBP: 00007f9623245024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9623436128 R14: 00007f9623436090 R15: 00007ffea89d2c28
 </TASK>