Re: I/O hangs after resuming from suspend-to-ram

[Martin Steigerwald]

Wols Lists - 26.08.17, 18:17:
> On 26/08/17 12:19, Martin Steigerwald wrote:
> > Alsoâ when a hang happened the mouse pointer was frozen, Ctrl-Alt-F1
> > didnÂt
> > work and so onâ so it may easily be a completely different issue.
> > 
> > I did not see much point in reporting it so farâ as I have no idea on how
> > to reliably pin-point the issue. It happens once every few days, so a
> > bisect again is out of questions â (it is anyway for a production machine
> > for me) â, it appears to be a hard freeze, so no debug dataâ its one of
> > these "you donÂt get to debug me" hangs again. I really have no idea how
> > to a get hold on such complexity. I am hoping to at least pin-point the
> > exact kernel option that triggers this issue, but it may take weeks to do
> > so. IÂd really love a way for the kernel to at least to write out debug
> > data before doing hanging completely.
> 
> This sounds like what I'm getting - SuSE 42.3, no raid, doesn't happen
> when the power lead is in (but I think the laptop is configured not to
> suspend when powered, precisely to avoid exactly this).
> 
> It happens to me quite often, unfortunately, but it seems a KDE issue in
> that applications work fine, UNTIL KDE seems to get control of the mouse
> at which point I can't do anything.
> 
> I've got a feeling it's related to wireless networking actually, my
> setup is somewhat borked because KDE, systemd, and wifi don't seem to
> work nicely together :-(

Well my issue isnÂt related to wireless networking as my laptop at home is 
using good old cable based ethernet. I do use Plasma tough. The issue of the 
original poster appears to be blk-mq related.

As written, I have no idea whether my issue is related to blk-mq in any way. 
Thats the next step IÂd test. If the current kernel runs stableâ then IÂd 
enable blk-mq by default again and test whether the hangs reappear. Unless I 
can pinpoint the issue to blk-mqâ I have nothing further to comment here, I 
think. (And I didnÂt intend to use the thread for every hang on resume issue 
that currently may exist. I just donÂt know yet whether my issue is related to 
blk-mq so I chimed in.)

Thanks,
-- 
Martin