Hi Chao

I'm testing the kernel with your patch since last night. Will give new
feedback a couple of days/weeks about how it goes.


Thank you.



On Mon, Aug 21, 2017 at 11:58 AM, Chao Yu <c...@kernel.org> wrote:
> Hi Marcelo,
>
> Thanks for the report!
>
> Would you have a try with below patch?
>
> f2fs: fix out-of-order execution in f2fs_issue_flush
>
> Thanks,
>
> On 2017/8/16 15:24, Marcelo "Marc" Ranolfi wrote:
>> Just wanted to let you all know that this is still an issue, even with
>> the 4.12.7 kernel.
>>
>> The two most affected applications are qemu-system-x86_64 and totem.
>>
>> On Wed, Aug 9, 2017 at 3:04 AM, Marcelo "Marc" Ranolfi
>> <marc.2...@gmail.com> wrote:
>>> What follows is a bug report.
>>>
>>> I've been experiencing system lockups somewhat randomly. Sometimes an
>>> application freezes, and when I go check its properties, it says the
>>> process' Wait Channel is _f2fs_issue_flush_.
>>>
>>> Sometimes it's the qemu process (which I use via libvirt), other times
>>> it's Firefox, or Gnome Videos (totem) and it happened to Nemo once as
>>> well. I have screenshots if necessary.
>>>
>>> I've been tracking this with screenshots, and it's happenning every 4
>>> days - on average.
>>>
>>> When this happens, the process stays unresponsive no matter what. I tried:
>>>
>>> - Restarting swap
>>> - Restarting the Display Manager
>>> - Graceful shutdown / reboot - takes forever, doesn't work
>>> - Shutdown -k and unmounting filesystems from command line - root
>>> can't be unmounted unless -l used, no solution
>>>
>>> The only working solution is to reset the machine via power button or
>>> #reboot -f.
>>>
>>> I have:
>>>
>>> - Kingston SV300S37A120G - hardware is fine, I have other OS / filesystems 
>>> on it
>>> - f2fs filesystem in a 40 GB partition, GPT
>>> - kernel 4.12.4 with systemd 234.11 - typical up-to-date Arch Linux setup.
>>>
>>> You gentlemen let me know if I provide more help.
>>>
>>> Best,
>>> Marc
>>
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