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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