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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: 4381 Comm: kmmpd-loop0 Not tainted 6.1.112-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
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 : ffff800022147b10
x29: ffff800022147b20 x28: 1fffe00019a4c072 x27: dfff800000000000
x26: 1ffff00004428f74 x25: 0000000000000000 x24: 1fffe0001be2d53f
x23: 1fffe00019a4c0cf x22: ffff0000cd262000 x21: 0000000000003801
x20: ffff0000df16a9f8 x19: 0000000000000005 x18: 1fffe000367a3376
x17: ffff8000159cd000 x16: ffff800008303e98 x15: ffff0001b3d19bbc
x14: 1ffff00002b3a0b0 x13: dfff800000000000 x12: 0000000000000001
x11: 0000000000ff0100 x10: 0000000000000000 x9 : ffff800008b43594
x8 : ffff0000c6e55340 x7 : ffff800008eb69e8 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff800008eb64b0
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 97e6df19 d4210000 97e6df17 (d4210000) 
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