------------[ cut here ]------------
WARNING: CPU: 1 PID: 7550 at fs/buffer.c:1149 mark_buffer_dirty+0x369/0x4a0 fs/buffer.c:1149
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 7550 Comm: syz-executor.1 Not tainted 4.14.163-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x142/0x197 lib/dump_stack.c:58
 panic+0x1f9/0x42d kernel/panic.c:183
 __warn.cold+0x2f/0x2f kernel/panic.c:547
 report_bug+0x216/0x254 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x1bb/0x310 arch/x86/kernel/traps.c:295
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:963
RIP: 0010:mark_buffer_dirty+0x369/0x4a0 fs/buffer.c:1149
RSP: 0018:ffff88804d5ef878 EFLAGS: 00010216
RAX: 0000000000040000 RBX: ffff88808fd95c78 RCX: ffffc90007035000
RDX: 00000000000035de RSI: ffffffff819b7029 RDI: ffff88808fd95c78
RBP: ffff88804d5ef898 R08: ffffed1009f96500 R09: 0000000000000000
R10: ffffed1009f964ff R11: ffff88804fcb27ff R12: ffff888094385d20
R13: ffff888077644780 R14: ffffed100eec8915 R15: ffff88808fd95c78
 bfs_move_block fs/bfs/file.c:43 [inline]
 bfs_move_blocks fs/bfs/file.c:56 [inline]
 bfs_get_block+0x356/0xb50 fs/bfs/file.c:125
 __block_write_begin_int+0x396/0x1100 fs/buffer.c:2027
 __block_write_begin fs/buffer.c:2077 [inline]
 block_write_begin+0x5f/0x280 fs/buffer.c:2136
 bfs_write_begin+0x3a/0xc0 fs/bfs/file.c:177
 generic_perform_write+0x1f8/0x480 mm/filemap.c:3047
 __generic_file_write_iter+0x239/0x5b0 mm/filemap.c:3172
 generic_file_write_iter+0x303/0x660 mm/filemap.c:3200
 call_write_iter include/linux/fs.h:1777 [inline]
 new_sync_write fs/read_write.c:469 [inline]
 __vfs_write+0x4a7/0x6b0 fs/read_write.c:482
 vfs_write+0x198/0x500 fs/read_write.c:544
 SYSC_write fs/read_write.c:590 [inline]
 SyS_write+0xfd/0x230 fs/read_write.c:582
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45af49
RSP: 002b:00007fcf0c9bac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045af49
RDX: 0000000008800000 RSI: 0000000020000240 RDI: 0000000000000006
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcf0c9bb6d4
R13: 00000000004cccb2 R14: 00000000004e8000 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..