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

From: Thomas Gleixner
Date: Fri Jun 21 2019 - 15:33:42 EST

On Fri, 21 Jun 2019, Chris Wilson wrote:

> 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
> hang.
> 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.

Hmm. Do you have a serial log of that incident?