------------[ cut here ]------------
WARNING: CPU: 0 PID: 4486 at fs/buffer.c:1148 mark_buffer_dirty+0x48b/0x5d0 fs/buffer.c:1148
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 4486 Comm: syz-executor6 Not tainted 4.14.0-rc8+ #169
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+0x194/0x257 lib/dump_stack.c:53
 panic+0x1e4/0x417 kernel/panic.c:181
 __warn+0x1c4/0x1d9 kernel/panic.c:542
 report_bug+0x211/0x2d0 lib/bug.c:184
 fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:178
 do_trap_no_signal arch/x86/kernel/traps.c:212 [inline]
 do_trap+0x260/0x390 arch/x86/kernel/traps.c:261
 do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:298
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:311
 invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:906
RIP: 0010:mark_buffer_dirty+0x48b/0x5d0 fs/buffer.c:1148
RSP: 0018:ffff8801c7e9f188 EFLAGS: 00010297
RAX: ffff8801c74e0440 RBX: ffff8801c3b6a9d8 RCX: 0000000000000200
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8801c3b6a9d8
RBP: ffff8801c7e9f298 R08: 0000000000000200 R09: ffffea00073f4640
R10: 0000000000000040 R11: ffffed0039fa323f R12: 1ffff10038fd3e32
R13: dffffc0000000000 R14: ffff8801c7e9f270 R15: 0000000000000000
 __block_commit_write.isra.33+0x13b/0x2f0 fs/buffer.c:2099
 block_write_end+0x99/0x1c0 fs/buffer.c:2177
 blkdev_write_end+0xc3/0x280 fs/block_dev.c:605
 generic_perform_write+0x3a4/0x600 mm/filemap.c:3036
 __generic_file_write_iter+0x366/0x5b0 mm/filemap.c:3150
 blkdev_write_iter+0x207/0x3e0 fs/block_dev.c:1905
 call_write_iter include/linux/fs.h:1771 [inline]
 do_iter_readv_writev+0x525/0x7f0 fs/read_write.c:674
 do_iter_write+0x154/0x540 fs/read_write.c:953
 vfs_iter_write+0x77/0xb0 fs/read_write.c:966
 iter_file_splice_write+0x7db/0xf30 fs/splice.c:749
 do_splice_from fs/splice.c:851 [inline]
 direct_splice_actor+0x125/0x180 fs/splice.c:1018
 splice_direct_to_actor+0x2c1/0x820 fs/splice.c:973
 do_splice_direct+0x29b/0x3c0 fs/splice.c:1061
 do_sendfile+0x5c9/0xe80 fs/read_write.c:1434
 SYSC_sendfile64 fs/read_write.c:1489 [inline]
 SyS_sendfile64+0xbd/0x160 fs/read_write.c:1481
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x452879
RSP: 002b:00007fe8e005dbe8 EFLAGS: 00000212 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452879
RDX: 00000000200ddff8 RSI: 0000000000000003 RDI: 0000000000000000
RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000100000001 R11: 0000000000000212 R12: 00000000006f4808
R13: 00000000ffffffff R14: 00007fe8e005e6d4 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..