------------[ cut here ]------------
kernel BUG at fs/buffer.c:2795!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 14861 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+0x566/0x580 fs/buffer.c:2795
Code: e8 af f0 87 ff be 00 10 00 00 48 c7 c7 20 74 26 8d 4c 89 ea e8 db 87 67 02 e9 8b fe ff ff e8 91 f0 87 ff 0f 0b e8 8a f0 87 ff <0f> 0b e8 83 f0 87 ff 0f 0b e8 7c f0 87 ff 0f 0b e8 75 f0 87 ff 0f
RSP: 0018:ffffc9000b637cc0 EFLAGS: 00010293
RAX: ffffffff81ff91e6 RBX: 0000000000000000 RCX: ffff88802d2ebc00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000003801 R08: ffff88805a51bd9f R09: 1ffff1100b4a37b3
R10: dffffc0000000000 R11: ffffed100b4a37b4 R12: 1ffff1100b4a37b3
R13: 0000000000000000 R14: ffff88805a51bd98 R15: ffff88802ef42000
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcc348f6286 CR3: 000000000cf32000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000460
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 write_mmp_block_thawed+0x3b1/0x540 fs/ext4/mmp.c:51
 write_mmp_block+0x129/0x390 fs/ext4/mmp.c:67
 kmmpd+0x344/0x990 fs/ext4/mmp.c:178
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:submit_bh_wbc+0x566/0x580 fs/buffer.c:2795
Code: e8 af f0 87 ff be 00 10 00 00 48 c7 c7 20 74 26 8d 4c 89 ea e8 db 87 67 02 e9 8b fe ff ff e8 91 f0 87 ff 0f 0b e8 8a f0 87 ff <0f> 0b e8 83 f0 87 ff 0f 0b e8 7c f0 87 ff 0f 0b e8 75 f0 87 ff 0f
RSP: 0018:ffffc9000b637cc0 EFLAGS: 00010293
RAX: ffffffff81ff91e6 RBX: 0000000000000000 RCX: ffff88802d2ebc00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000003801 R08: ffff88805a51bd9f R09: 1ffff1100b4a37b3
R10: dffffc0000000000 R11: ffffed100b4a37b4 R12: 1ffff1100b4a37b3
R13: 0000000000000000 R14: ffff88805a51bd98 R15: ffff88802ef42000
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7096e6cfe8 CR3: 000000007df06000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000460
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400