------------[ cut here ]------------
kernel BUG at fs/buffer.c:2714!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 1250 Comm: kmmpd-loop0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:submit_bh_wbc+0x4c9/0x4f0 fs/buffer.c:2714
Code: c3 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c bd fe ff ff 48 89 df e8 08 d4 e7 ff e9 b0 fe ff ff e8 5e 3a a2 ff 0f 0b e8 57 3a a2 ff <0f> 0b e8 50 3a a2 ff 0f 0b e8 49 3a a2 ff 0f 0b e8 42 3a a2 ff 0f
RSP: 0000:ffffc9001237fca0 EFLAGS: 00010293
RAX: ffffffff81cf33e9 RBX: 0000000000000000 RCX: ffff8881125ed100
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9001237fcf0 R08: ffff888116a050af R09: 1ffff11022d40a15
R10: dffffc0000000000 R11: ffffed1022d40a16 R12: 0000000000000000
R13: 1ffff11022d40a15 R14: ffff888116a050a8 R15: 0000000000003801
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000c000 CR3: 00000001314e6000 CR4: 00000000003506a0
Call Trace:
 <TASK>
 submit_bh+0x1f/0x30 fs/buffer.c:2755
 write_mmp_block_thawed+0x397/0x510 fs/ext4/mmp.c:51
 write_mmp_block+0x138/0x2b0 fs/ext4/mmp.c:67
 kmmpd+0x738/0x940 fs/ext4/mmp.c:246
 kthread+0x281/0x320 kernel/kthread.c:386
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:submit_bh_wbc+0x4c9/0x4f0 fs/buffer.c:2714
Code: c3 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c bd fe ff ff 48 89 df e8 08 d4 e7 ff e9 b0 fe ff ff e8 5e 3a a2 ff 0f 0b e8 57 3a a2 ff <0f> 0b e8 50 3a a2 ff 0f 0b e8 49 3a a2 ff 0f 0b e8 42 3a a2 ff 0f
RSP: 0000:ffffc9001237fca0 EFLAGS: 00010293
RAX: ffffffff81cf33e9 RBX: 0000000000000000 RCX: ffff8881125ed100
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9001237fcf0 R08: ffff888116a050af R09: 1ffff11022d40a15
R10: dffffc0000000000 R11: ffffed1022d40a16 R12: 0000000000000000
R13: 1ffff11022d40a15 R14: ffff888116a050a8 R15: 0000000000003801
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f172cdf32f8 CR3: 0000000130bae000 CR4: 00000000003506b0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000fffe0ff0 DR7: 0000000000000400