From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Martin Steigerwald To: Wols Lists Cc: Oleksandr Natalenko , Ming Lei , Jens Axboe , Christoph Hellwig , linux-block@vger.kernel.org, linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org, Shaohua Li Subject: Re: I/O hangs after resuming from suspend-to-ram Date: Sat, 26 Aug 2017 21:33:04 +0200 Message-ID: <3987895.gqtK3X00tl@merkaba> In-Reply-To: <59A1AD17.70208@youngman.org.uk> References: <3926917.BCSovyVWdL@natalenko.name> <4679671.be02cq1OFG@merkaba> <59A1AD17.70208@youngman.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" List-ID: Wols Lists - 26.08.17, 18:17: > On 26/08/17 12:19, Martin Steigerwald wrote: > > Also=E2=80=A6 when a hang happened the mouse pointer was frozen, Ctrl-A= lt-F1 > > didn=C2=B4t > > work and so on=E2=80=A6 so it may easily be a completely different issu= e. > >=20 > > I did not see much point in reporting it so far=E2=80=A6 as I have no i= dea on how > > to reliably pin-point the issue. It happens once every few days, so a > > bisect again is out of questions =E2=80=93 (it is anyway for a producti= on machine > > for me) =E2=80=93, it appears to be a hard freeze, so no debug data=E2= =80=A6 its one of > > these "you don=C2=B4t get to debug me" hangs again. I really have no id= ea 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. I=C2=B4d really love a way for the kernel to at least to write out = debug > > data before doing hanging completely. >=20 > 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). >=20 > 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. >=20 > 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 isn=C2=B4t related to wireless networking as my laptop at hom= e is=20 using good old cable based ethernet. I do use Plasma tough. The issue of th= e=20 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= =2E=20 Thats the next step I=C2=B4d test. If the current kernel runs stable=E2=80= =A6 then I=C2=B4d=20 enable blk-mq by default again and test whether the hangs reappear. Unless = I=20 can pinpoint the issue to blk-mq=E2=80=A6 I have nothing further to comment= here, I=20 think. (And I didn=C2=B4t intend to use the thread for every hang on resume= issue=20 that currently may exist. I just don=C2=B4t know yet whether my issue is re= lated to=20 blk-mq so I chimed in.) Thanks, =2D-=20 Martin