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

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Message-ID: <156114224132.2401.13297188928702045223@skylake-alporthouse-com>
Date:   Fri, 21 Jun 2019 19:37:21 +0100
From:   Chris Wilson <chris@...is-wilson.co.uk>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Joerg Roedel <joro@...tes.org>
Subject: Re: NMI hardlock stacktrace deadlock [was Re: Linux 5.2-rc5]

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.
-Chris