------------[ cut here ]------------ kernel BUG at fs/buffer.c:3027! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 3450 Comm: kmmpd-loop8 Tainted: G W 5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:submit_bh_wbc+0x8bd/0x8e0 fs/buffer.c:3027 Code: 4d a8 80 e1 07 80 c1 03 38 c1 0f 8c 0e fe ff ff 48 8b 7d a8 e8 84 fd eb ff e9 00 fe ff ff e8 6a 03 be ff 0f 0b e8 63 03 be ff <0f> 0b e8 5c 03 be ff 0f 0b e8 55 03 be ff 0f 0b e8 4e 03 be ff 0f RSP: 0018:ffff8881c3f8fc60 EFLAGS: 00010293 RAX: ffffffff81a17b7d RBX: ffff8881f109bf18 RCX: ffff8881df7a3f00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff8881c3f8fd08 R08: dffffc0000000000 R09: ffffed103e2137e4 R10: ffffed103e2137e4 R11: 1ffff1103e2137e3 R12: 0000000000000000 R13: 0000000000003800 R14: 0000000000000000 R15: 1ffff1103e2137e3 FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f496b155710 CR3: 00000001e8c6e000 CR4: 00000000003406a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: submit_bh+0x2a/0x40 fs/buffer.c:3076 write_mmp_block+0x379/0x4e0 fs/ext4/mmp.c:55 kmmpd+0x276/0x9a0 fs/ext4/mmp.c:246 kthread+0x31e/0x3a0 kernel/kthread.c:288 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:354 Modules linked in: ---[ end trace f6ecbdfa60745c63 ]--- RIP: 0010:submit_bh_wbc+0x8bd/0x8e0 fs/buffer.c:3027 Code: 4d a8 80 e1 07 80 c1 03 38 c1 0f 8c 0e fe ff ff 48 8b 7d a8 e8 84 fd eb ff e9 00 fe ff ff e8 6a 03 be ff 0f 0b e8 63 03 be ff <0f> 0b e8 5c 03 be ff 0f 0b e8 55 03 be ff 0f 0b e8 4e 03 be ff 0f RSP: 0018:ffff8881c3f8fc60 EFLAGS: 00010293 RAX: ffffffff81a17b7d RBX: ffff8881f109bf18 RCX: ffff8881df7a3f00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff8881c3f8fd08 R08: dffffc0000000000 R09: ffffed103e2137e4 R10: ffffed103e2137e4 R11: 1ffff1103e2137e3 R12: 0000000000000000 R13: 0000000000003800 R14: 0000000000000000 R15: 1ffff1103e2137e3 FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1e71b5c178 CR3: 00000001e3be8000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400