EXT4-fs error (device loop4): ext4_fill_super:4382: inode #2: comm syz-executor708: iget: root inode unallocated
EXT4-fs (loop4): get root inode failed
EXT4-fs (loop4): mount failed
EXT4-fs (loop2): mount failed
------------[ cut here ]------------
kernel BUG at fs/buffer.c:3106!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 8030 Comm: kmmpd-loop4 Not tainted 4.14.295-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
task: ffff888095e4e280 task.stack: ffff8880977c8000
RIP: 0010:submit_bh_wbc+0x573/0x6f0 fs/buffer.c:3106
RSP: 0018:ffff8880977cfd98 EFLAGS: 00010297
RAX: ffff888095e4e280 RBX: ffff88808df95f18 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000003800 RDI: 0000000000000001
RBP: ffff8880957fa440 R08: 0000000000000000 R09: 0000000000050414
R10: ffff888095e4eb08 R11: ffff888095e4e280 R12: 0000000000003800
R13: 0000000000000000 R14: 0000000000000001 R15: 00000000ffff9872
FS:  0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbe4cd52f60 CR3: 00000000a5c83000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 write_mmp_block+0x1b4/0x2d0 fs/ext4/mmp.c:55
 kmmpd+0x655/0x990 fs/ext4/mmp.c:246
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Code: 10 c2 ff f0 80 63 01 f7 e9 66 fb ff ff 48 8d 43 10 4c 8d 7b 20 48 89 44 24 08 e9 55 fc ff ff e8 c4 10 c2 ff 0f 0b e8 bd 10 c2 ff <0f> 0b e8 b6 10 c2 ff 0f 0b e8 af 10 c2 ff 0f 0b e8 a8 10 c2 ff 
RIP: submit_bh_wbc+0x573/0x6f0 fs/buffer.c:3106 RSP: ffff8880977cfd98
---[ end trace 8c469a9f1036fe3b ]---