Re: NMI hardlock stacktrace deadlock [was Re: Linux 5.2-rc5]

From: Chris Wilson
Date: Fri Jun 21 2019 - 14:38:17 EST

Quoting Thomas Gleixner (2019-06-21 16:30:52)
> Chris, do you have the actual NMI lockup detector splats somewhere?

Sorry, I'm having a hard time reproducing this at will now. The test
case depends on the right timing of the wrong event to cause the GPU to

>From memory, I got the
"Watchdog detected hard LOCKUP on cpu foo"
followed by the register dump and then nothing. At which point I had to
power cycle the machine.