------------[ cut here ]------------
sb_rdonly(sb)
WARNING: fs/ext4/ext4_jbd2.c:83 at ext4_journal_check_start+0x24f/0x2b0 fs/ext4/ext4_jbd2.c:83, CPU#0: syz.0.0/5327
Modules linked in:
CPU: 0 UID: 0 PID: 5327 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:ext4_journal_check_start+0x24f/0x2b0 fs/ext4/ext4_jbd2.c:83
Code: 5b 41 5c 41 5d 41 5e 41 5f 5d e9 0c 33 61 09 cc e8 c6 89 3b ff 41 bf fb ff ff ff eb e0 e8 b9 89 3b ff eb d3 e8 b2 89 3b ff 90 <0f> 0b 90 eb c8 e8 a7 89 3b ff 90 0f 0b 90 43 80 7c 25 00 00 0f 85
RSP: 0000:ffffc9000faa7570 EFLAGS: 00010293
RAX: ffffffff828c976e RBX: ffff8880383e4000 RCX: ffff888033008000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffff88803ff3440f R09: 1ffff11007fe6881
R10: dffffc0000000000 R11: ffffed1007fe6882 R12: dffffc0000000000
R13: 1ffff1100707c8cf R14: ffff8880383e4678 R15: 0000000000000001
FS:  00007fcb995716c0(0000) GS:ffff88808b0b4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcb9111e000 CR3: 0000000012fa5000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __ext4_journal_start_sb+0x14b/0x780 fs/ext4/ext4_jbd2.c:115
 ext4_sample_last_mounted fs/ext4/file.c:941 [inline]
 ext4_file_open+0x76a/0xab0 fs/ext4/file.c:973
 do_dentry_open+0x816/0x1380 fs/open.c:996
 vfs_open+0x3b/0x340 fs/open.c:1101
 do_open fs/namei.c:4866 [inline]
 path_openat+0x1443/0x1d60 fs/namei.c:5029
 do_file_open+0x23e/0x4a0 fs/namei.c:5058
 do_open_execat+0x12b/0x590 fs/exec.c:786
 open_exec+0x29/0x40 fs/exec.c:822
 open_interp_file fs/binfmt_misc.c:278 [inline]
 bm_register_write+0xdad/0x1820 fs/binfmt_misc.c:1482
 vfs_write+0x296/0xba0 fs/read_write.c:685
 ksys_write+0x150/0x270 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcb9d19e1d9
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:00007fcb99570fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fcb9d426450 RCX: 00007fcb9d19e1d9
RDX: 000000000000005c RSI: 00002000000001c0 RDI: 0000000000000004
RBP: 00007fcb9d235888 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcb9d4264e8 R14: 00007fcb9d426450 R15: 00007ffd7821b558
 </TASK>