Date: Fri, 11 Sep 2020 16:24:28 -0700 From: Kevin Oberman <rkoberman@gmail.com> To: driesm.michiels@gmail.com Cc: =?UTF-8?Q?Jan_Kokem=C3=BCller?= <jan.kokemueller@gmail.com>, FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: Livelock on recent current Message-ID: <CAN6yY1v8E2JJu4pZ9dZJv5aD4rsmc43d3m_B_dpON-drshwcMg@mail.gmail.com> In-Reply-To: <000201d68811$ba37f7e0$2ea7e7a0$@gmail.com> References: <CAN6yY1vsLjZ7aEqrbmxKCpxTOZF8a33ZkWayH00y4enx%2BiR00g@mail.gmail.com> <a2425ef0-8140-1b97-a091-7884cb607d1c@gmail.com> <000001d68808$f1801fb0$d4805f10$@gmail.com> <000201d68811$ba37f7e0$2ea7e7a0$@gmail.com>
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On Fri, Sep 11, 2020 at 1:01 AM <driesm.michiels@gmail.com> wrote: > > > On 09.09.20 06:18, Kevin Oberman wrote: > > > > I am seeing a problem since I moved to current on my laptop this > week. > > > > It's odd as it is linked to the keyboard. As long as the keyboard is > > > > active, everything is fine, but if the keyboard is not used, after a > > > > few minutes, it locks up and gets very hot. The system may be busy > > > > or idle. The system seems completely locked. It does not respond in > > > > the network and the display, X or just vt is frozen. The only factor > > > > is use > > of the > > > keyboard. > > > > I'm actually very happy someone else ran into this too! I have a Lenovo > T490 > > (azerty edition, yeah I known ...) I found it incredible hard to > describe, > but i > > have the exact same problem. > > I categorized it as "random system freezes", but now that you say its > related to > > keyboard interaction it makes sense when I observe the lock. > > > > System locks up when it happens and the fan ramps up AFTER the dead lock. > > I'm pretty sure the getting "hot" symptom is caused by the deadlock and > not a > > symptom of the deadlock. > > Maybe a very important factor, the issue is not present in STABLE-12, I > downgraded previous week to verify this. > > > > > > > > > Reminds me of this bug: > > > > > > https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225341 > > > > I am also using a non default keyboard layout, as described in the bug > above. > > I'll probably try the patch in the coming weekend to see if it helps. > > > > > > > > I've been experiencing similar hangs when that timer in atkbd is > enabled. > > It > > > doesn't seem to happen in the default keyboard configuration, though. > > > > > > -Jan I'm happy to see that I am not crazy! This is mostly anecdotal. The freezes have occurred regularly, without question, but the details are not statistically verified. This is based on my perceptions. The only things I am really sure of is that the system is unusable on head and runs well on 12.1-Release. This system has a rather new Intel GPU, the Comet Lake, and is only supported on head with drm-devel-kmod, so moving back to 12.1 is not an option. I am curious what processor is on the T490. I am using the default keyboard layout. On terminal sessions (vt), when the keyboard is idle. I have had the system run for a couple of hours or longer with no problems. To get bigger ports to build, I usually switch to another vty and keep that one fairly busy. It will freeze when no vty is active, but as long as any is active every minute or less. I have had freezes in under a minute, but rarely. Moving on to other possibly related (or not) issues: When running on X (MATE), it may freeze whether the keyboard is active or not. OTOH, it seems to freeze less often. I've had X lock up mid-word but also run for 15 or more minutes. It eventually does freeze, but I don't think I've ever gone more than 10 minutes on an idle keyboard without a freeze without X running. Switching to a vty and keeping it fairly active still seems to keep the system alive while X is being used. X is performing very poorly. If the processors are busy, say by building a port, screen updates are very slow, often pausing for several seconds. Expose events seem to often redraw all windows which is very annoying. Several times I thought the system was frozen only to suddenly have the screen update and everything be normal, again. -- Kevin Oberman, Part time kid herder and retired Network Engineer E-mail: rkoberman@gmail.com PGP Fingerprint: D03FB98AFA78E3B78C1694B318AB39EF1B055683
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