linux-kernel - Re: BUG: Sporadic crashes with current Linus tree

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Message-ID: <alpine.DEB.2.20.1709141756200.1916@nanos>
Date:   Thu, 14 Sep 2017 18:00:24 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Andy Lutomirski <luto@...nel.org>
cc:     LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        X86 ML <x86@...nel.org>
Subject: Re: BUG: Sporadic crashes with current Linus tree

On Thu, 14 Sep 2017, Andy Lutomirski wrote:
> On Thu, Sep 14, 2017 at 12:38 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
> > Hi!
> >
> > I've seen the following crash sporadically with commit 46c1e79fee:
> >
> > Have not seen that with 3882a734c19b, though I saw the PCID warnings on
> > that machine.
> >
> > I have no idea how to reproduce so bisecting is pretty much pointless. Any
> > idea what to do?
> 
> Does tools/testing/selftests/x86/sigreturn_64 reproduce it?

Will try tomorrow once I figured out how to compile that stuff. Invoking a
simple make in that directory fails.

Built it manually and when I run it tells: stack16 is too high

> Ugh, weird.  It kind of looks like current->thread.sp0 == NULL.  I
> have a patch series that changes a bunch of that code in my git tree,
> but that's definitely not in Linus' tree.

Right. The stupid thing is that the machine did not throw up all day
neither idle nor loaded. Still the same kernel which barfed tonight several
times.

Thanks,

	tglx