loop0: detected capacity change from 0 to 4096
EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.
------------[ cut here ]------------
WARNING: fs/ext4/ext4_jbd2.c:75 at ext4_journal_check_start+0x24f/0x2b0 fs/ext4/ext4_jbd2.c:75, CPU#0: syz.0.0/5339
Modules linked in:
CPU: 0 UID: 0 PID: 5339 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~bpo12+1 04/01/2014
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 c3 cc cc cc cc cc e8 d6 bf 4c ff 41 bf fb ff ff ff eb e0 e8 c9 bf 4c ff eb d3 e8 c2 bf 4c ff 90 <0f> 0b 90 eb c8 e8 b7 bf 4c ff 90 0f 0b 90 43 80 7c 25 00 00 0f 85
RSP: 0018:ffffc9000e867438 EFLAGS: 00010293
RAX: ffffffff8274455e RBX: ffff88801227a000 RCX: ffff888034688000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000365 R08: ffff888012278387 R09: 1ffff1100244f070
R10: dffffc0000000000 R11: ffffed100244f071 R12: dffffc0000000000
R13: 1ffff1100244f4c7 R14: ffff88801227a638 R15: 0000000000000001
FS:  00007fa9870246c0(0000) GS:ffff88808d416000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa986fc1d58 CR3: 000000003fea5000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __ext4_journal_start_sb+0x147/0x580 fs/ext4/ext4_jbd2.c:107
 ext4_sample_last_mounted fs/ext4/file.c:869 [inline]
 ext4_file_open+0x72c/0xa40 fs/ext4/file.c:901
 do_dentry_open+0x7ce/0x1420 fs/open.c:962
 vfs_open+0x3b/0x340 fs/open.c:1094
 do_open fs/namei.c:4628 [inline]
 path_openat+0x340e/0x3dd0 fs/namei.c:4787
 do_filp_open+0x1fa/0x410 fs/namei.c:4814
 do_open_execat+0x135/0x560 fs/exec.c:783
 open_exec+0x40/0x60 fs/exec.c:822
 bm_register_write+0x22e/0x1790 fs/binfmt_misc.c:820
 vfs_write+0x27e/0xb30 fs/read_write.c:684
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa98618f7c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa987024038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fa9863e5fa0 RCX: 00007fa98618f7c9
RDX: 000000000000005c RSI: 00002000000001c0 RDI: 0000000000000004
RBP: 00007fa986213f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa9863e6038 R14: 00007fa9863e5fa0 R15: 00007ffed1a35938
 </TASK>