:: Re: [DNG] kernel instabilities
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Author: Hendrik Boom
Date:  
To: dng
Old-Topics: Re: [DNG] kernel instability 4.9.0-12 with latest update
Subject: Re: [DNG] kernel instabilities
Is there any way we could gather useful information about these crashes.

I'm not any kind of  kernel expert, but I'd like to contribute useful
    information, if possible, when such a crash happens.


(1) Do we even know it's a kernel problem?
(2) They don't seem to be specific to a particular kernel;  Of course
    they might have entirely different causes.
(3) Is Debian having similar probems?
(4) Might it be something in the way the kernel is being used?  
    Perhaps something takes over the mouse, touchpad, and keyboard so that
    the user becomes helpless?
(5) Surely there is some relevant partial shutdown, dumping, 
    and/or logging procedure that would provide clues?


-- hendrik

On Wed, Mar 18, 2020 at 08:58:51AM -0600, Gabe Stanton via Dng wrote:
> It happened again this morning after running the cpu heavy miner for
> about 14 hours. I don't recall it ever happening when I wasn't running
> that program, and having it happen now reaffirms for me that is the
> cause on my machine. Prior to the beowulf upgrade I had it running
> pretty much all the time for a few months without issue.
>
> On Tue, 2020-03-17 at 14:26 -0400, Hendrik Boom wrote:
> > On Tue, Mar 17, 2020 at 09:39:21AM -0600, Gabe Stanton via Dng wrote:
> > > One more thing, I'm actually on kernel version 4.19.0.8, but again,
> > > this issue started when I upgraded to beowulf.
> >
> > I've been on beowulf for months now, doing the usual upgrades every
> > few weeks, but only started experiencing
> > freezes in the past week or two. I don't know what causes them.
> >
> > hendrik@midwinter:~$ uname -a
> > Linux midwinter 4.9.0-6-amd64 #1 SMP Debian 4.9.88-1+deb9u1 (2018-05-
> > 07) x86_64 GNU/Linux
> > hendrik@midwinter:~$
> >
> > -- hendrik
> >
> > > On Tue, 2020-03-17 at 09:34 -0600, Gabe Stanton via Dng wrote:
> > > > I've had problems with my machine freezing as well, same
> > > > symptoms,
> > > > ever
> > > > since upgrading to beowulf. The issue for me seems to happen when
> > > > I
> > > > run
> > > > a cpu/ram heavy program, specifically a cpu cryptominer. I've had
> > > > it
> > > > happen a number of times, always when mining with max 2 cores,
> > > > but
> > > > haven't dedicated the time to report it properly. I did look
> > > > through
> > > > various logs in /var/logs but I didn't see anything seemed
> > > > relevant
> > > > to
> > > > the problem.
> > > >
> > > > I'll try to reproduce it today and send any relevant logs.
> > > >
> > > > What logs specifically would be relevant to this issue?
> > > >
> > > > Something relevant to the spectre/meltdown mitigations, I have
> > > > multithreading turned off in the bios and have had since the
> > > > vuln's
> > > > were revealed.
> > > >
> > > > Also, 64 bit intel cpu here as well.
> > > >
> > > > On Tue, 2020-03-17 at 03:17 +0000, tuxd3v wrote:
> > > > > Hello Riccardo,
> > > > >
> > > > > > On Sat, 7 Mar 2020 12:19:52 +0100
> > > > > > Riccardo Mottola via Dng <dng@???> >wrote:
> > > > > > Hi,
> > > > > >
> > > > > >
> > > > > > I am using Devuan on an HP laptop with intel 64bit cpu.
> > > > > > Everything
> > > > > > worked very well, I did a lot of compilation and it is very
> > > > > > stable,
> > > > > > never had a freeze in months!
> > > > > >
> > > > > > [    0.100000] smpboot: CPU0: Intel(R) Core(TM)2 CPU T7200  @
> > > > > > 2.00GHz 
> > > > > > (family: 0x6, model: 0xf, stepping: 0x6)
> > > > > > [    0.100000] Performance Events: PEBS fmt0-, Core2 events,
> > > > > > Intel
> > > > > > PMU 
> > > > > > driver.
> > > > > > [    0.100000] core: PEBS disabled due to CPU errata

> > > > > >
> > > > > > Yesterday I installed a kernel upgrade, bad things happened
> > > > > >
> > > > > > 1) after the first reboot with the new kernel, I get up to my
> > > > > > desktop,
> > > > > > check out sources ad start building Arctic Fox browser, come
> > > > > > back
> > > > > > after
> > > > > > a time and find the machine completely frozen - no disk
> > > > > > activity,
> > > > > > no
> > > > > > mouse possible, no errors. No response to power button
> > > > > > pressed
> > > > > > (had
> > > > > > to
> > > > > > press 5 seconds)
> > > > > >
> > > > > > 2) at reboot, machine freezes quite early in the boot process
> > > > > >
> > > > > > 3) I retry and it still freezes
> > > > > >
> > > > > >
> > > > > > I tried selecting in GRUB the older kernel and it boots. It
> > > > > > goes
> > > > > > past
> > > > > > the last error, starts file system check/journal replay and
> > > > > > the
> > > > > > machine
> > > > > > seems stable again.
> > > > > >
> > > > > >
> > > > > > This is the last good kernel version:
> > > > > >
> > > > > > 4.9.0-11-amd64 #1 SMP Debian 4.9.189-3+deb9u2 (2019-11-11)
> > > > > > x86_64
> > > > > > GNU/Linux
> > > > > >
> > > > > >
> > > > > > the unstable version must be the version 4.9.210-1 installed
> > > > > >
> > > > > >
> > > > > > What could the issue be? I read about backports of spectre
> > > > > > mitigations
> > > > > > being possible issues.
> > > > > >
> > > > >
> > > > > * 'linux-image-4.9.0-12' - I believe , brings Meltdown, Spectre
> > > > > and
> > > > > such mitigation's with it, also fix's..
> > > > > * 'linux-image-4.9.0-11' - Here , sometimes( firefox + youtube
> > > > > videos
> > > > > ), I also have freezes, but the machine ends rebooting..
> > > > >                            Don't know why, never found the real
> > > > > reason for it..
> > > > >                            If I don't go on youtube, everything
> > > > > works, so focus your self on your taks,
> > > > >                            and don't be lazy( its what my
> > > > > computer
> > > > > tells me ) :D

> > > > >
> > > > > For a better understanding of the changes, you can check:
> > > > > ~# zless /usr/share/doc/linux-image-$(uname
> > > > > -r)/changelog.Debian.gz
> > > > >
> > > > >
> > > > > I am also in 'linux-image-4.9.0-11'..and I plan to be there for
> > > > > some
> > > > > time.. :)
> > > > >
> > > > > Best Regards,
> > > > > tux
> > > > >
> > > > >
> > > >
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