loop0: detected capacity change from 0 to 4096
EXT4-fs (loop0): Test dummy encryption mode enabled
EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.
------------[ 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.0.254/8032
Modules linked in:
CPU: 1 UID: 0 PID: 8032 Comm: syz.0.254 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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 c3 cc cc cc cc cc e8 06 a1 4e ff 41 bf fb ff ff ff eb e0 e8 f9 a0 4e ff eb d3 e8 f2 a0 4e ff 90 <0f> 0b 90 eb c8 e8 e7 a0 4e ff 90 0f 0b 90 43 80 7c 25 00 00 0f 85
RSP: 0018:ffffc90004017398 EFLAGS: 00010283
RAX: ffffffff8275d35e RBX: ffff88805a40a000 RCX: 0000000000080000
RDX: ffffc90005279000 RSI: 0000000000000849 RDI: 000000000000084a
RBP: 0000000000000370 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1006a01081 R12: dffffc0000000000
R13: 1ffff1100b4814f3 R14: ffff88805a40a798 R15: 0000000000000001
FS:  00007fa30aede6c0(0000) GS:ffff888126279000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcd51410368 CR3: 0000000029c34000 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+0x750/0xa90 fs/ext4/file.c:912
 do_dentry_open+0x83d/0x13e0 fs/open.c:947
 vfs_open+0x3b/0x350 fs/open.c:1079
 do_open fs/namei.c:4699 [inline]
 path_openat+0x2e43/0x38a0 fs/namei.c:4858
 do_file_open+0x23e/0x4a0 fs/namei.c:4887
 do_open_execat+0x12b/0x590 fs/exec.c:781
 open_exec+0x29/0x40 fs/exec.c:817
 bm_register_write+0x233/0x1770 fs/binfmt_misc.c:821
 vfs_write+0x2a3/0xba0 fs/read_write.c:686
 ksys_write+0x156/0x270 fs/read_write.c:740
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa30cc8cdd9
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:00007fa30aede028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fa30cf05fa0 RCX: 00007fa30cc8cdd9
RDX: 0000000000000035 RSI: 0000200000000080 RDI: 0000000000000004
RBP: 00007fa30cd22d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa30cf06038 R14: 00007fa30cf05fa0 R15: 00007ffcf85a6d58
 </TASK>