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kernel BUG at fs/buffer.c:2666!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 8990 Comm: kmmpd-loop0 Not tainted 6.1.130-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : submit_bh_wbc+0x3f4/0x468 fs/buffer.c:2666
lr : submit_bh_wbc+0x3f4/0x468 fs/buffer.c:2666
sp : ffff800021527b10
x29: ffff800021527b20 x28: 1fffe0001c4cd872 x27: dfff800000000000
x26: 1ffff000042a4f74 x25: 0000000000000000 x24: 1fffe0001e9c843a
x23: 1fffe0001c4cd8cf x22: ffff0000e266e000 x21: 0000000000003801
x20: ffff0000f4e421d0 x19: 0000000000000005 x18: 1fffe0003679c776
x17: ffff800015afd000 x16: ffff800008300c0c x15: ffff0001b3ce3bbc
x14: 1ffff00002b600b2 x13: dfff800000000000 x12: 0000000000000001
x11: 0000000000ff0100 x10: 0000000000000000 x9 : ffff800008b3c1a0
x8 : ffff0000f98bd340 x7 : ffff800008eaf718 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff800008eaf1e0
x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 submit_bh_wbc+0x3f4/0x468 fs/buffer.c:2666
 submit_bh+0x2c/0x3c fs/buffer.c:2707
 write_mmp_block_thawed+0x340/0x52c fs/ext4/mmp.c:51
 write_mmp_block+0x23c/0x734 fs/ext4/mmp.c:67
 kmmpd+0x330/0x9f8 fs/ext4/mmp.c:178
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864
Code: 17ffffad 97e6de8f d4210000 97e6de8d (d4210000) 
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