WARNING in __set_page_dirty

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 62872f95 Merge 4.4.174 into android-4.4
git tree: android-4.4
console output: https://syzkaller.appspot.com/x/log.txt?x=1194cd72a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=47bc4dd423780c4a
dashboard link: https://syzkaller.appspot.com/bug?extid=1d770e7e10997c379cb7
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
userspace arch: i386

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+1d770e...@syzkaller.appspotmail.com

netlink: 1 bytes leftover after parsing attributes in process
`syz-executor.5'.
------------[ cut here ]------------
WARNING: CPU: 0 PID: 6364 at fs/buffer.c:640
__set_page_dirty.constprop.0+0x14c/0x1c0 fs/buffer.c:640()
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 6364 Comm: syz-executor.0 Not tainted 4.4.174+ #17
0000000000000000 4ed689e32d57df21 ffff8801d4dff3a0 ffffffff81aad1a1
0000000000000000 ffffffff82835ee0 ffffffff828a31c0 0000000000000280
ffffffff8154387c ffff8801d4dff480 ffffffff813a48c2 0000000041b58ab3
Call Trace:
[<ffffffff81aad1a1>] __dump_stack lib/dump_stack.c:15 [inline]
[<ffffffff81aad1a1>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
[<ffffffff813a48c2>] panic+0x1b9/0x37b kernel/panic.c:112
[<ffffffff813a4ab9>] warn_slowpath_common kernel/panic.c:455 [inline]
[<ffffffff813a4ab9>] warn_slowpath_common.cold+0x20/0x20 kernel/panic.c:435
[<ffffffff810d3aaa>] warn_slowpath_null+0x2a/0x30 kernel/panic.c:492
[<ffffffff8154387c>] __set_page_dirty.constprop.0+0x14c/0x1c0
fs/buffer.c:640
[<ffffffff81544cb8>] __set_page_dirty_buffers+0x108/0x1b0 fs/buffer.c:701
[<ffffffff813d426c>] set_page_dirty+0xbc/0x150 mm/page-writeback.c:2564
[<ffffffff81547e2f>] block_page_mkwrite+0x1df/0x270 fs/buffer.c:2455
[<ffffffff81665af0>] ext4_page_mkwrite+0xb80/0xef0 fs/ext4/inode.c:5483
[<ffffffff8142eb82>] do_page_mkwrite+0x1d2/0x360 mm/memory.c:2057
[<ffffffff814344fc>] wp_page_shared mm/memory.c:2327 [inline]
[<ffffffff814344fc>] do_wp_page+0xb5c/0x1340 mm/memory.c:2431
[<ffffffff8143b2e4>] handle_pte_fault mm/memory.c:3362 [inline]
[<ffffffff8143b2e4>] __handle_mm_fault mm/memory.c:3474 [inline]
[<ffffffff8143b2e4>] handle_mm_fault+0x1614/0x3140 mm/memory.c:3503
[<ffffffff810aaa4e>] __do_page_fault+0x28e/0x7f0 arch/x86/mm/fault.c:1243
[<ffffffff810ab008>] do_page_fault+0x28/0x30 arch/x86/mm/fault.c:1306
[<ffffffff82719e35>] page_fault+0x25/0x30 arch/x86/entry/entry_64.S:1064
[<ffffffff814b17a4>] pipe_read+0x274/0x860 fs/pipe.c:270
[<ffffffff81496725>] new_sync_read fs/read_write.c:424 [inline]
[<ffffffff81496725>] __vfs_read+0x2e5/0x3c0 fs/read_write.c:436
[<ffffffff81498264>] vfs_read+0x134/0x360 fs/read_write.c:456
[<ffffffff8149aa8c>] SYSC_read fs/read_write.c:571 [inline]
[<ffffffff8149aa8c>] SyS_read+0xdc/0x1c0 fs/read_write.c:564
[<ffffffff8100603d>] do_syscall_32_irqs_on arch/x86/entry/common.c:330
[inline]
[<ffffffff8100603d>] do_fast_syscall_32+0x32d/0xa90
arch/x86/entry/common.c:397
[<ffffffff8271a350>] sysenter_flags_fixed+0xd/0x1a
Kernel Offset: disabled
Rebooting in 86400 seconds..


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.