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Re: Need help debugging total system lockup, probably notebook power saving related

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Hi Henning,
thanks for the tip.

However, I've been experiencing this issue already before the
spectre/meltdown bunch hit the fan.
It does sound like it a bit, but likely is some different HW stuff.
For now I'm experimenting with i915.enable_rc6=0. I hope it won't bog down
the battery run-time too much.

Ondrej G.

On Wed, Feb 21, 2018 at 3:55 PM, Henning Follmann <hfollmann@itcfollmann.com
> wrote:

> On Wed, Feb 21, 2018 at 09:51:58AM +0100, Ondřej Grover wrote:
> > Hello,
> >
> > I need help debugging random total system lock-ups.
> > This is a notebook Acer Aspire V3-572G-78A running Debian Stretch with
> > the 4.9.0-5-amd64 kernel.
> >
> > When running on battery (does not happen on AC power), usually after
> > resuming from RAM, after some rather random time (can be a few minutes to
> > hours) the system suddenly locks up, the screen freezes, keyboard and the
> > click-pad don't react, sound keeps playing a ~2 second loop. The computer
> > does not react to magic SysRq combos (probably because the keyboard
> doesn't
> > react), or to pressing the power key. I cannot ping it nor ssh into it.
> The
> > notebook appears to stay in this state indefinitely (the screen does not
> > blank). Only a ~10-sec power-key hold or removing the battery does a hard
> > reset.
> >
> > I believe this is a kernel-level lock-up in some hardware driver.
> > Unfortunately, I haven't been able to find out which one, because the log
> > files (tried both syslog and journald) contain nothing out of the
> ordinary
> > just before the lock-up. Probably the IO locks-up as well.
> >
> > Netconsole isn't really an easy option, because I cannot reliably
> reproduce
> > this in a suitable controlled environment, which is further complicated
> by
> > the lack of polling support (required for netconsole) on the wireless
> > interface.
> >
> > My suspects:
> > - The integrated Intel graphics card with the i915 driver: always had
> > issues with it (on linux-3.16 it used to crash/hang a lot), maybe the gpu
> > hangs are not properly detected anymore.
> > - The hard disk sometimes loses APM levels after suspend (have to use
> > pm_async == 0 to prevent errors after each suspend). Maybe this points
> to a
> > larger suspend/power-mgmt issue.
> > - My iwlwifi interface sometimes crashes and only removing it from the
> PCI
> > bus and rescanning for it helps. But this procedure does not hang the
> whole
> > system.
> >
> > Any help, suggestions, pointers will be appreciated.
> >
>
> Hello,
> I do have some power management issues with 4.9.0-5-amd64. My issues seem
> different than yours ( I cannot boot up with power plugged in) but it is
> also a hard stop, no logs available. I really haven't figured out the exact
> cause however in my case they seem related to the spectre/meltdown fix in
> the newest kernel.
> You can switch that off by adding pti=off to
> GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub and running update-grub.
>
> It is no ideal solution, but maybe it helps narrowing down the issue.
>
>
> -H
>
>
> --
> Henning Follmann           | hfollmann@itcfollmann.com
>
>

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Thread

Need help debugging total system lockup, probably notebook power  saving related Ondřej Grover <ondrej.grover@gmail.com> - 2018-02-21 10:00 +0100
  Re: Need help debugging total system lockup, probably notebook power  saving related Henning Follmann <hfollmann@itcfollmann.com> - 2018-02-21 16:00 +0100
    Re: Need help debugging total system lockup, probably notebook power  saving related Ondřej Grover <ondrej.grover@gmail.com> - 2018-02-21 20:20 +0100
      Re: Need help debugging total system lockup, probably notebook power  saving related Ondřej Grover <ondrej.grover@gmail.com> - 2018-02-22 13:10 +0100

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