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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: 6929 Comm: kmmpd-loop4 Not tainted 6.1.138-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+0x3e0/0x454 fs/buffer.c:2666
lr : submit_bh_wbc+0x3e0/0x454 fs/buffer.c:2666
sp : ffff800021527bb0
x29: ffff800021527bc0 x28: ffff0000f86bf008 x27: dfff800000000000
x26: 1fffe0001aa8b8cf x25: 0000000000000000 x24: 1fffe0001c44cbd0
x23: dfff800000000000 x22: ffff0000d545e000 x21: 0000000000003801
x20: ffff0000e2265e80 x19: 0000000000000005 x18: ffff800011a7bd00
x17: 1fffe00033ee7176 x16: ffff8000082cff58 x15: ffff80001506d000
x14: 0000000000000100 x13: 1ffff00002a0e0b1 x12: 0000000000ff0100
x11: ff00800008a80be8 x10: 0000000000000000 x9 : ffff800008a80be8
x8 : ffff0000dc528000 x7 : ffff800008db3bc8 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff800008db373c
x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 submit_bh_wbc+0x3e0/0x454 fs/buffer.c:2666
 submit_bh+0x2c/0x3c fs/buffer.c:2707
 write_mmp_block_thawed+0x300/0x4ac fs/ext4/mmp.c:51
 write_mmp_block+0x1e4/0x5f0 fs/ext4/mmp.c:67
 kmmpd+0x2c4/0x940 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 97e8813c d4210000 97e8813a (d4210000) 
---[ end trace 0000000000000000 ]---