Hi Sean,

thanks for your tips, very helpful!

Am 17.11.2024 um 18:37 schrieb Sean C. Farley:
Various things to consider:
- Run MemTest86 on your system for a few passes to make sure your memory
   is stable.  If you undervolt too much, this will fail.  However, it
   could be a sign of bad memory or not enough current to the Memory
   Controller (MC).  The highest level of XMP for my memory will knock
   the voltage of the MC to a low level causing major system instability.

I ran MemTest86 for several passes and no errors were reported. The machine wasn't overclocked or undervolted.

- I doubt it is the act of Firefox or Thunderbird dying that is causing
   the system to crash.  They could be tickling something to cause that
   such as a driver.

As indicated in my reply to Pete, I decided to replace the machine after it began exhibiting failures to boot properly after problems with the BIOS occured.

[...]

- Check in /var/crash for any panics.  That could be why it takes a
   couple of minutes to reboot; it is writing the panic to disk.

- Enable crash dumps in /etc/rc.conf.  See rc.conf(5) and dumpon(8) for
   information.

Crash dumps were enabled, but never got written to disk (Swap on ZFS is a bad idea). In any case, there wasn't any disk activity when this problem occured, that's what puzzled me the most.

Best
Philipp

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