------------[ cut here ]------------
WARNING: CPU: 1 PID: 27667 at fs/buffer.c:1160 mark_buffer_dirty+0x1fc/0x420 fs/buffer.c:1160()
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 27667 Comm: syz-executor6 Not tainted 4.4.105-gdcfa5fe #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 6f0e9804e939e771 ffff8800b8287480 ffffffff81cc90ef
 ffffffff83842a00 ffff8800b8287558 ffff8800b8287548 ffffffff813fabe6
 0000000041b58ab3 ffffffff83fa5d10 ffffffff813faa5f 0000000041b58ab3
Call Trace:
 [<ffffffff81cc90ef>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81cc90ef>] dump_stack+0x8e/0xcf lib/dump_stack.c:51
 [<ffffffff813fabe6>] panic+0x187/0x2f1 kernel/panic.c:112
 [<ffffffff81124b78>] warn_slowpath_common+0x108/0x120 kernel/panic.c:455
 [<ffffffff81124d75>] warn_slowpath_null+0x15/0x20 kernel/panic.c:492
 [<ffffffff8159b23c>] mark_buffer_dirty+0x1fc/0x420 fs/buffer.c:1160
 [<ffffffff8159b6f6>] __block_commit_write.isra.29+0xb6/0x1b0 fs/buffer.c:2006
 [<ffffffff8159d99e>] block_write_end+0x2e/0xb0 fs/buffer.c:2084
 [<ffffffff815a5a6b>] blkdev_write_end+0x1b/0x40 fs/block_dev.c:325
 [<ffffffff813febe6>] generic_perform_write+0x326/0x500 mm/filemap.c:2561
 [<ffffffff81404a50>] __generic_file_write_iter+0x2f0/0x500 mm/filemap.c:2675
 [<ffffffff815a64c9>] blkdev_write_iter+0x199/0x4f0 fs/block_dev.c:1655
 [<ffffffff814f6105>] vfs_iter_write+0x195/0x2d0 fs/read_write.c:364
 [<ffffffff8158df7d>] iter_file_splice_write+0x4fd/0xb60 fs/splice.c:1024
 [<ffffffff8158a814>] do_splice_from fs/splice.c:1128 [inline]
 [<ffffffff8158a814>] direct_splice_actor+0x104/0x1c0 fs/splice.c:1294
 [<ffffffff8158bdc5>] splice_direct_to_actor+0x2a5/0x820 fs/splice.c:1247
 [<ffffffff8158c48c>] do_splice_direct+0x14c/0x270 fs/splice.c:1337
 [<ffffffff814f9de4>] do_sendfile+0x4d4/0xf40 fs/read_write.c:1227
 [<ffffffff814fc0a0>] SYSC_sendfile64 fs/read_write.c:1282 [inline]
 [<ffffffff814fc0a0>] SyS_sendfile64+0xb0/0x130 fs/read_write.c:1274
 [<ffffffff8374a636>] entry_SYSCALL_64_fastpath+0x16/0x76
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..