Random server crashes every few weeks (smp_invltlb: endless loop […] retrysmp_invltlb: ipi sent)

Stefan Unterweger 232.20711 at chiffre.aleturo.com
Mon Aug 8 05:18:03 PDT 2016

Und täglich grüßt das Murmeltier… :o/

Another crash with 09b0c4f76, but this one looks different.  The console
was scrolling endless streams of lines like this one:

| swap_pager: indefinite wait buffer:  bp 0xffffffe00e57bea8 offset: 4133535744, size: 4096

With varying values for both ‚bp‘ and ‚offset‘.  No kernel panic,

The system was swapping when it happened; I was toying with the dports
git repository.  I have seen a crash like this once before, but this was
months ago.  Is this related, or something new altogether?

Reboot went without any problems, so -that- problem really does seem to
be resolved.


* Stefan Unterweger on Sun, Aug 07, 2016 at 02:49:31AM +0200:
> I stalled the update a bit because I wanted to make sure that the boot
> problems were resolved first (our customers are already edgy; another
> two-hour downtime just for booting would have been too much).
> Given that 4.6 is now out, I’ve decided to take the plunge and do it.
> Booting went without a fault (could be coincidence; I will see if the
> problem is gone next time when I’ll re-add more storage), initial quick
> stress tests went rather well.  As far as I can tell, I/O performance
> has approximately doubled.
> I have scheduled a few heavy stress tests for the upcoming weekend where
> I will try to torture the system with everything I got, then I’ll report
> back.
> Once again: Thanks BIG time for all the wonderful work that all of you
> have put into Dragonfly, I really enjoy working with it.
> Cheers,
>     Stefan

> * Matthew Dillon on Tue, Jul 26, 2016 at 06:03:03PM -0700:
> > On this issue, we've made a bunch of fixes in just the last few days, you
> > will definitely want to update to the latest master.  Things are looking a
> > lot more stable now.  We are continuing to life test three server
> > configurations this week to locate any remaining low-hanging fruit.
> > 
> > -Matt

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