Messages in this thread | | | From | Chris Wilson <> | Subject | Re: NMI hardlock stacktrace deadlock [was Re: Linux 5.2-rc5] | Date | Fri, 21 Jun 2019 20:56:13 +0100 |
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Quoting Thomas Gleixner (2019-06-21 20:33:36) > 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?
I use netconsole. I think Tomi has a serial console for most things available, but not permanently hooked up. And I didn't have it in a tee as it was late, with the lockup an annoyance to the bug I was trying to solve. I'll keep trying to recreate that bug as once I do have that recipe, it should be possible to bisect. I can check with Tomi on Monday if he can pull a machine out of the farm and see how it locked up. -Chris
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