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SubjectWARN_ON_ONCE in fs/iomap.c:993
Hi,

I am fuzzing linux 4.13-rc7 with XFS using syzkaller on x86_64 and I
found the following warning:

WARNING: CPU: 2 PID: 5391 at fs/iomap.c:993 iomap_dio_rw+0xc79/0xe70
fs/iomap.c:993
Kernel panic - not syncing: panic_on_warn set ...

CPU: 2 PID: 5391 Comm: syz-executor1 Not tainted 4.13.0-rc7 #4
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
Ubuntu-1.8.2-1ubuntu1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:16 [inline]
dump_stack+0xf7/0x1aa lib/dump_stack.c:52
panic+0x1ae/0x3a7 kernel/panic.c:180
__warn+0x1c4/0x1d9 kernel/panic.c:541
report_bug+0x211/0x2d0 lib/bug.c:183
fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:190
do_trap_no_signal arch/x86/kernel/traps.c:224 [inline]
do_trap+0x260/0x390 arch/x86/kernel/traps.c:273
do_error_trap+0x118/0x340 arch/x86/kernel/traps.c:310
do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:323
invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:846
RIP: 0010:iomap_dio_rw+0xc79/0xe70 fs/iomap.c:993
RSP: 0018:ffff88006d13f6d0 EFLAGS: 00010297
RAX: ffff880069c3da00 RBX: ffff88006d04c000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffffed000da27ed0
RBP: ffff88006d13f8c0 R08: 0000000000000001 R09: 1ffff1000da27ddb
R10: ffff88006d13eea0 R11: 0000000000000002 R12: 1ffff1000da27eea
R13: 000000007ffff000 R14: 0000000000000000 R15: ffff88006d13fac8
xfs_file_dio_aio_read+0x19c/0x5a0 fs/xfs/xfs_file.c:220
xfs_file_read_iter+0x369/0x460 fs/xfs/xfs_file.c:286
call_read_iter include/linux/fs.h:1737 [inline]
generic_file_splice_read+0x3f9/0x7b0 fs/splice.c:307
do_splice_to+0x10a/0x160 fs/splice.c:896
splice_direct_to_actor+0x23e/0x870 fs/splice.c:968
do_splice_direct+0x29b/0x3c0 fs/splice.c:1077
do_sendfile+0x5c9/0xe80 fs/read_write.c:1412
SYSC_sendfile64 fs/read_write.c:1467 [inline]
SyS_sendfile64+0xbd/0x160 fs/read_write.c:1459
entry_SYSCALL_64_fastpath+0x18/0xad
RIP: 0033:0x451e59
RSP: 002b:00007fa4a3718c08 EFLAGS: 00000216 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 0000000000451e59
RDX: 0000000020005ff8 RSI: 0000000000000003 RDI: 0000000000000003
RBP: 0000000000000046 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000800000000 R11: 0000000000000216 R12: 0000000000000000
R13: 00007ffde54a34ef R14: 00007fa4a37199c0 R15: 0000000000000000
Dumping ftrace buffer:
(ftrace buffer empty)
Kernel Offset: 0x18a00000 from 0xffffffff81000000 (relocation range:
0xffffffff80000000-0xffffffffbfffffff)
Rebooting in 86400 seconds..

Here is a reproducer program: https://pastebin.com/tc014k97
Here are my configs: https://pastebin.com/PWtYUiHD

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