------------[ cut here ]------------
WARNING: CPU: 1 PID: 9912 at fs/ext4/inode.c:3327 ext4_ext_direct_IO fs/ext4/inode.c:3327 [inline]()
WARNING: CPU: 1 PID: 9912 at fs/ext4/inode.c:3327 ext4_direct_IO+0x22bc/0x2a60 fs/ext4/inode.c:3405()
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 9912 Comm: syz-executor2 Not tainted 4.4.155+ #34
 0000000000000000 63b8afe30046bc34 ffff8801d8587500 ffffffff81a556dd
 ffffffff82835440 ffff8801c2215f00 ffffffff828beb80 0000000000000009
 0000000000000cff ffff8801d85875c0 ffffffff8138af64 0000000041b58ab3
Call Trace:
 [<ffffffff81a556dd>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81a556dd>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff8138af64>] panic+0x19e/0x359 kernel/panic.c:112
 [<ffffffff8138b154>] warn_slowpath_common.cold.6+0x20/0x20 kernel/panic.c:455
 [<ffffffff810d1879>] warn_slowpath_null+0x29/0x30 kernel/panic.c:492
 [<ffffffff816109cc>] ext4_ext_direct_IO fs/ext4/inode.c:3327 [inline]
 [<ffffffff816109cc>] ext4_direct_IO+0x22bc/0x2a60 fs/ext4/inode.c:3405
 [<ffffffff813a3467>] generic_file_direct_write+0x267/0x4e0 mm/filemap.c:2493
 [<ffffffff813a3934>] __generic_file_write_iter+0x254/0x550 mm/filemap.c:2673
 [<ffffffff81602966>] ext4_file_write_iter+0x966/0xc80 fs/ext4/file.c:171
 [<ffffffff81552be1>] aio_run_iocb+0x511/0x700 fs/aio.c:1475
 [<ffffffff81557027>] io_submit_one fs/aio.c:1577 [inline]
 [<ffffffff81557027>] do_io_submit+0x5b7/0xe50 fs/aio.c:1635
 [<ffffffff8156ab13>] C_SYSC_io_submit fs/compat.c:651 [inline]
 [<ffffffff8156ab13>] compat_SyS_io_submit+0xe3/0x130 fs/compat.c:636
 [<ffffffff81005ffe>] do_syscall_32_irqs_on arch/x86/entry/common.c:393 [inline]
 [<ffffffff81005ffe>] do_fast_syscall_32+0x31e/0x8b0 arch/x86/entry/common.c:460
 [<ffffffff82692350>] sysenter_flags_fixed+0xd/0x1a
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..