------------[ cut here ]------------ kernel BUG at fs/buffer.c:3027! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 6667 Comm: kmmpd-loop1 Not tainted 5.4.274-syzkaller-00002-g6f97bd951d82 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 RIP: 0010:submit_bh_wbc+0x831/0x850 fs/buffer.c:3027 Code: 10 80 e1 07 80 c1 03 38 c1 0f 8c 14 fe ff ff 48 8b 7c 24 10 e8 00 8d ea ff e9 05 fe ff ff e8 f6 a7 ba ff 0f 0b e8 ef a7 ba ff <0f> 0b e8 e8 a7 ba ff 0f 0b e8 e1 a7 ba ff 0f 0b e8 da a7 ba ff 0f RSP: 0018:ffff8881d72f7bf0 EFLAGS: 00010293 RAX: ffffffff81a99431 RBX: 0000000000000000 RCX: ffff8881e573bf00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000003800 R08: ffffffff81a98ca4 R09: ffffed1038f457cf R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000 R13: ffff8881c7a2be70 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f749f3ea98c CR3: 00000001dc308000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: submit_bh+0x21/0x30 fs/buffer.c:3076 write_mmp_block+0x3ff/0x5b0 fs/ext4/mmp.c:55 kmmpd+0x7de/0xa10 fs/ext4/mmp.c:246 kthread+0x2da/0x360 kernel/kthread.c:288 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:354 Modules linked in: ---[ end trace 2620c2c0107bb6b8 ]--- RIP: 0010:submit_bh_wbc+0x831/0x850 fs/buffer.c:3027 Code: 10 80 e1 07 80 c1 03 38 c1 0f 8c 14 fe ff ff 48 8b 7c 24 10 e8 00 8d ea ff e9 05 fe ff ff e8 f6 a7 ba ff 0f 0b e8 ef a7 ba ff <0f> 0b e8 e8 a7 ba ff 0f 0b e8 e1 a7 ba ff 0f 0b e8 da a7 ba ff 0f RSP: 0018:ffff8881d72f7bf0 EFLAGS: 00010293 RAX: ffffffff81a99431 RBX: 0000000000000000 RCX: ffff8881e573bf00