Machine lockup - WAS: Re: drmn0: error: GPU lockup CP stall for more than 10000msec

[Jean-Sébastien Pédron]

On 16.09.2014 22:52, Michael Jung wrote:
> Since starting to use the DRI driver I am having problems with my machine
> locking up.  Remote ssh sessions die, keyboard dead, screen blank.

Most Radeon GPU lockups come from the fact we use(d) a version of Mesa
too old (9.1.7). Now, for FreeBSD 10.1 and 11-CURRENT, Mesa 10.3.0 is
provided (or will be with the next package build) and this version works
*way* better for Radeon users.

> I am asking for pointers on how to try and debug this.  My system is ZFS
> on boot so I created a swap partition on USB /dev/da0s1b and added
> 
> dumpdev="/dev/da0p1"
> 
> to rc.conf.  After rebooting into single user mode and mounting zfs
> partitions "zfs mount -a" I tried
> 
> #savecore /var/crash /dev/da0p1 but savecore complains that no core files
> were found. Is kernel dump to USB swap not supported?

Yes it is.

You may need to add the following sysctl:
debug.debugger_on_panic=0

It should not be necessary with vt(4), but with syscons, this allows the
kernel to dump core after an X session was started.

-- 
Jean-Sébastien Pédron

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