Re: Debugging mysterious freeze / crash
On Sat, Sep 22, 2018 at 10:51:27PM -0400, Celejar wrote:
> I've been experiencing a great deal of frustration recently with
> intermittent freezes / crashes on my Debian Sid system (a Lenovo
> W550s). The symptoms are that the screen totally freezes and the system
> becomes completely unresponsive (even ssh attempts from another machine
> fail), and the only thing that seems to have any effect is a hard
> reboot (holding down the power button until the system restarts).
> Upon reboot, I can't find anything at all interesting in 'journalctl -b
> -1', or /var/log/syslog - the former just shows everything looking
> normal until the moment of the crash, at which point the log just ends,
> and the latter also just shows everything seeming to be fine until the
> moment of the crash, and then shows the boot messages from the reboot.
> Any ideas of what could be causing this, or how I could go about
> debugging it? I've been using this machine for years without
> experiencing anything like this, and I'm not sure for how long this has
> been a problem. I did recently upgrade from stable to unstable, but I'm
> not sure whether or not the problem's initial occurences coincide with
> the upgrade.
How long have you waited before you reboot? I occasionally (pretty
rarely, thankfully) get freezes on my Lenovo T400 running Debian 9
Stretch (stable) and I used to think I would have to hard reboot it
like you do, but I noticed that they actually get fixed if I wait up to
a few minutes. Never timed them but the longest probably lasted more
than five minutes. Usually they're less than a minute.
When these freezes happen, it seems it is relatively soon after starting
to use the laptop after it's been suspended overnight or so. They're
rare, though. I didn't try ssh'ing at the time but everything is
completely frozen. And finally, these freezes didn't use to happen a
year ago or earlier but it's been at least a few months that this has
been going on.
Your machine and Debian version seem much newer but I thought I'd share