------------[ cut here ]------------
WARNING: CPU: 0 PID: 3982 at fs/direct-io.c:293 dio_complete+0x578/0x800 fs/direct-io.c:293
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 3982 Comm: syz-executor214 Not tainted 4.14.76+ #19
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xb9/0x11b lib/dump_stack.c:53
 panic+0x1bf/0x3a4 kernel/panic.c:181
 __warn.cold.7+0x148/0x185 kernel/panic.c:542
 report_bug+0x1f7/0x26c lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 do_error_trap+0x1ba/0x2c0 arch/x86/kernel/traps.c:295
 invalid_op+0x18/0x40 arch/x86/entry/entry_64.S:944
RIP: 0010:dio_complete+0x578/0x800 fs/direct-io.c:293
RSP: 0018:ffff8801d5e27070 EFLAGS: 00010297
RAX: ffff8801d5558000 RBX: ffff8801d416ad80 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8801d5558024
RBP: 0000000000010000 R08: 1ffff10043eeee00 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801c52ad4d8
R13: 0000000000010000 R14: 0000000000000002 R15: ffff8801d416ae18
 do_blockdev_direct_IO fs/direct-io.c:1373 [inline]
 __blockdev_direct_IO+0x7614/0xc4e0 fs/direct-io.c:1399
 ext4_direct_IO_write fs/ext4/inode.c:3710 [inline]
 ext4_direct_IO+0x905/0x27f0 fs/ext4/inode.c:3863
 generic_file_direct_write+0x225/0x430 mm/filemap.c:2940
 __generic_file_write_iter+0x213/0x540 mm/filemap.c:3119
 ext4_file_write_iter+0x4f6/0xe20 fs/ext4/file.c:264
 call_write_iter include/linux/fs.h:1782 [inline]
 do_iter_readv_writev+0x3a4/0x560 fs/read_write.c:678
 do_iter_write+0x156/0x530 fs/read_write.c:957
 vfs_iter_write+0x70/0xa0 fs/read_write.c:970
 iter_file_splice_write+0x5b4/0xab0 fs/splice.c:749
 do_splice_from fs/splice.c:851 [inline]
 direct_splice_actor+0x116/0x160 fs/splice.c:1018
 splice_direct_to_actor+0x28c/0x750 fs/splice.c:973
 do_splice_direct+0x17b/0x220 fs/splice.c:1061
 do_sendfile+0x4a1/0xb50 fs/read_write.c:1438
 SYSC_sendfile64 fs/read_write.c:1493 [inline]
 SyS_sendfile64+0xab/0x140 fs/read_write.c:1485
 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4489d9
RSP: 002b:00007f8693cced18 EFLAGS: 00000297 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00000000006e4a28 RCX: 00000000004489d9
RDX: 0000000020d83ff8 RSI: 0000000000000007 RDI: 0000000000000005
RBP: 00000000006e4a20 R08: 0000000000000000 R09: 65732f636f72702f
R10: 00008000fffffffe R11: 0000000000000297 R12: 00000000006e4a2c
R13: 00007f8693cced20 R14: 70756f7267632f2e R15: 00000000006e4a20
Kernel Offset: 0x28000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
Rebooting in 86400 seconds..