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SubjectWARNING in ext4_set_page_dirty
From
Hello,

syzbot hit the following crash on upstream commit
10b84daddbec72c6b440216a69de9a9605127f7a (Sat Mar 31 17:59:00 2018 +0000)
Merge branch 'perf-urgent-for-linus' of
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
syzbot dashboard link:
https://syzkaller.appspot.com/bug?extid=9a44753ac327c557796a

So far this crash happened 3 times on upstream.
Unfortunately, I don't have any reproducer for this crash yet.
Raw console output:
https://syzkaller.appspot.com/x/log.txt?id=5118663967375360
Kernel config:
https://syzkaller.appspot.com/x/.config?id=-2760467897697295172
compiler: gcc (GCC) 7.1.1 20170620

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+9a44753ac327c557796a@syzkaller.appspotmail.com
It will help syzbot understand when the bug is fixed. See footer for
details.
If you forward the report, please keep this part and the footer.

WARNING: CPU: 0 PID: 7377 at fs/ext4/inode.c:3895
ext4_set_page_dirty+0x242/0x2b0 fs/ext4/inode.c:3895
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 7377 Comm: syz-executor1 Not tainted 4.16.0-rc7+ #9
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+0x194/0x24d lib/dump_stack.c:53
panic+0x1e4/0x41c kernel/panic.c:183
__warn+0x1dc/0x200 kernel/panic.c:547
report_bug+0x1f4/0x2b0 lib/bug.c:186
fixup_bug.part.10+0x37/0x80 arch/x86/kernel/traps.c:178
fixup_bug arch/x86/kernel/traps.c:247 [inline]
do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:986
RIP: 0010:ext4_set_page_dirty+0x242/0x2b0 fs/ext4/inode.c:3895
RSP: 0000:ffff88018b725df0 EFLAGS: 00010216
RAX: 0000000000040000 RBX: ffffea0006713040 RCX: ffffffff81ee1072
RDX: 0000000000002ee2 RSI: ffffc900074f3000 RDI: ffffea0006713040
RBP: ffff88018b725ec0 R08: 1ffff100316e4c1c R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff100316e4bbf
R13: ffffea0006713040 R14: ffff88018b725e98 R15: ffffea0006713060
set_page_dirty+0x2c5/0x5d0 mm/page-writeback.c:2565
set_page_dirty_lock+0xf2/0x160 mm/page-writeback.c:2590
dio_bio_complete+0x514/0x750 fs/direct-io.c:560
dio_await_completion fs/direct-io.c:581 [inline]
do_blockdev_direct_IO+0x7270/0xc960 fs/direct-io.c:1392
__blockdev_direct_IO+0x9d/0xd0 fs/direct-io.c:1421
ext4_direct_IO_read fs/ext4/inode.c:3830 [inline]
ext4_direct_IO+0xfe5/0x1980 fs/ext4/inode.c:3866
generic_file_read_iter+0x4cc/0x28e0 mm/filemap.c:2343
ext4_file_read_iter+0x113/0x160 fs/ext4/file.c:77
call_read_iter include/linux/fs.h:1776 [inline]
new_sync_read fs/read_write.c:401 [inline]
__vfs_read+0x6a7/0xa00 fs/read_write.c:413
vfs_read+0x11e/0x350 fs/read_write.c:447
SYSC_pread64 fs/read_write.c:611 [inline]
SyS_pread64+0x15b/0x190 fs/read_write.c:598
do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x454e79
RSP: 002b:00007feb4557bc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000011
RAX: ffffffffffffffda RBX: 00007feb4557c6d4 RCX: 0000000000454e79
RDX: 00000000ffffff72 RSI: 0000000020003c00 RDI: 0000000000000018
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000046d R14: 00000000006f8ad8 R15: 0000000000000000
Dumping ftrace buffer:
(ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to syzkaller@googlegroups.com.

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