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kernel BUG at fs/buffer.c:2666!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4416 Comm: kmmpd-loop0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : submit_bh_wbc+0x3e0/0x44c fs/buffer.c:2666
lr : submit_bh_wbc+0x3e0/0x44c fs/buffer.c:2666
sp : ffff800021617bb0
x29: ffff800021617bc0 x28: 0000000000000000 x27: 000000000000022b
x26: dfff800000000000 x25: ffff800021617c40 x24: dfff800000000000
x23: 1fffe000180c3acb x22: ffff0000f6da0000 x21: 0000000000003801
x20: ffff0000c061d658 x19: 0000000000000005 x18: 1fffe00033e7277e
x17: ffff80001537d000 x16: ffff8000082dba2c x15: ffff800008a4383c
x14: 0000000000000001 x13: 1fffe000180c3ad7 x12: 0000000000000000
x11: ff00800008aa2e50 x10: 0000000000000000 x9 : ffff800008aa2e50
x8 : ffff0000cc700000 x7 : ffff800008ddffc0 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff800008ddfc30
x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 submit_bh_wbc+0x3e0/0x44c fs/buffer.c:2666
 submit_bh+0x2c/0x3c fs/buffer.c:2707
 write_mmp_block_thawed+0x324/0x4d8 fs/ext4/mmp.c:51
 write_mmp_block+0x1e4/0x5f0 fs/ext4/mmp.c:67
 kmmpd+0x1c0/0x978 fs/ext4/mmp.c:246
 kthread+0x254/0x2e0 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
Code: 17ffffad 97e83e01 d4210000 97e83dff (d4210000) 
---[ end trace 0000000000000000 ]---