Re: Userspace locks at f2fs_issue_flush kernel call, hard reset necessary

["Marcelo \"Marc\" Ranolfi" <marc.2377@gmail.com>]

Chao,

I just had the same problem, with kernel 4.12.8 with patch _f2fs: fix
out-of-order execution in f2fs_issue_flush_.

On Tue, Aug 22, 2017 at 2:00 PM, Marcelo "Marc" Ranolfi
<marc.2377@gmail.com> wrote:
> 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 <chao@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.2377@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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