------------[ cut here ]------------
kernel BUG at fs/buffer.c:2666!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 11475 Comm: kmmpd-loop0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:submit_bh_wbc+0x4ac/0x4d0 fs/buffer.c:2666
Code: 01 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c c0 fe ff ff 48 89 ef e8 f5 69 e2 ff e9 b3 fe ff ff e8 bb 48 92 ff 0f 0b e8 b4 48 92 ff <0f> 0b e8 ad 48 92 ff 0f 0b e8 a6 48 92 ff 0f 0b e8 9f 48 92 ff 0f
RSP: 0018:ffffc9000e59fcc8 EFLAGS: 00010293
RAX: ffffffff81ee863c RBX: 0000000000000000 RCX: ffff888026df3b80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000003801 R08: dffffc0000000000 R09: ffffed100e00a17a
R10: ffffed100e00a17a R11: 1ffff1100e00a179 R12: 1ffff1100e00a179
R13: 0000000000000000 R14: ffff888070050bc8 R15: ffff888075ef4000
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000006000 CR3: 000000000c88e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 write_mmp_block_thawed+0x360/0x4f0 fs/ext4/mmp.c:51
 write_mmp_block+0x13e/0x3a0 fs/ext4/mmp.c:67
 kmmpd+0x6f7/0x980 fs/ext4/mmp.c:246
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:submit_bh_wbc+0x4ac/0x4d0 fs/buffer.c:2666
Code: 01 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c c0 fe ff ff 48 89 ef e8 f5 69 e2 ff e9 b3 fe ff ff e8 bb 48 92 ff 0f 0b e8 b4 48 92 ff <0f> 0b e8 ad 48 92 ff 0f 0b e8 a6 48 92 ff 0f 0b e8 9f 48 92 ff 0f
RSP: 0018:ffffc9000e59fcc8 EFLAGS: 00010293
RAX: ffffffff81ee863c RBX: 0000000000000000 RCX: ffff888026df3b80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000003801 R08: dffffc0000000000 R09: ffffed100e00a17a
R10: ffffed100e00a17a R11: 1ffff1100e00a179 R12: 1ffff1100e00a179
R13: 0000000000000000 R14: ffff888070050bc8 R15: ffff888075ef4000
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000006000 CR3: 000000007e1c0000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400