------------[ cut here ]------------
kernel BUG at fs/buffer.c:2714!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 12493 Comm: kmmpd-loop0 Not tainted 6.1.134-syzkaller-00015-g218e2bd24587 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
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 48 3d e8 ff e9 b0 fe ff ff e8 1e eb a3 ff 0f 0b e8 17 eb a3 ff <0f> 0b e8 10 eb a3 ff 0f 0b e8 09 eb a3 ff 0f 0b e8 02 eb a3 ff 0f
RSP: 0018:ffffc90002a87ca0 EFLAGS: 00010293
RAX: ffffffff81cbfbb9 RBX: 0000000000000000 RCX: ffff888118a68000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90002a87cf0 R08: dffffc0000000000 R09: ffffed1022eb087f
R10: ffffed1022eb087f R11: 1ffff11022eb087e R12: 0000000000000000
R13: 1ffff11022eb087e R14: ffff8881175843f0 R15: 0000000000003801
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f517d620047 CR3: 0000000120fb8000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 submit_bh+0x1f/0x30 fs/buffer.c:2755
 write_mmp_block_thawed+0x34a/0x4c0 fs/ext4/mmp.c:51
 write_mmp_block+0x138/0x2b0 fs/ext4/mmp.c:67
 kmmpd+0x3ce/0x950 fs/ext4/mmp.c:178
 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 48 3d e8 ff e9 b0 fe ff ff e8 1e eb a3 ff 0f 0b e8 17 eb a3 ff <0f> 0b e8 10 eb a3 ff 0f 0b e8 09 eb a3 ff 0f 0b e8 02 eb a3 ff 0f
RSP: 0018:ffffc90002a87ca0 EFLAGS: 00010293

RAX: ffffffff81cbfbb9 RBX: 0000000000000000 RCX: ffff888118a68000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90002a87cf0 R08: dffffc0000000000 R09: ffffed1022eb087f
R10: ffffed1022eb087f R11: 1ffff11022eb087e R12: 0000000000000000
R13: 1ffff11022eb087e R14: ffff8881175843f0 R15: 0000000000003801
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd94c580178 CR3: 0000000120fb8000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400