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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: 6264 Comm: kmmpd-loop0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
pstate: 82400005 (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 : ffff800020bf7bb0
x29: ffff800020bf7bc0 x28: ffff000101629008 x27: dfff800000000000
x26: 1fffe0001fdc20cf x25: 0000000000000000 x24: 1fffe0001c0e8bb3
x23: dfff800000000000 x22: ffff0000fee12000 x21: 0000000000003801
x20: ffff0000e0745d98 x19: 0000000000000005 x18: ffff800011abbcc0
x17: 1fffe00033ed797e x16: ffff8000082d0e30 x15: 0000000020c1d000
x14: 0000000000000000 x13: 1ffff00002a180b1 x12: 0000000000ff0100
x11: ff00800008a82160 x10: 0000000000000000 x9 : ffff800008a82160
x8 : ffff0000cd1e0000 x7 : ffff800008db5f4c x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff800008db571c
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+0x668/0x940 fs/ext4/mmp.c:246
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
Code: 17ffffad 97e87dd1 d4210000 97e87dcf (d4210000) 
---[ end trace 0000000000000000 ]---