Re: tip -ENOBOOT - bisected to locking/refcounts, x86/asm: Implement fast refcount overflow protection

From	Mike Galbraith <efault@gmx.de>
Newsgroups	linux.kernel
Subject	Re: tip -ENOBOOT - bisected to locking/refcounts, x86/asm: Implement fast refcount overflow protection
Date	2017-08-29 12:10 +0200
Message-ID	<ujLD4-1hQ-19@gated-at.bofh.it> (permalink)
References	<ujKxj-oP-7@gated-at.bofh.it> <ujKxj-oP-13@gated-at.bofh.it> <ujL0m-PP-15@gated-at.bofh.it> <ujL0m-PP-17@gated-at.bofh.it>
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On Tue, 2017-08-29 at 11:27 +0200, Ingo Molnar wrote:
> * Mike Galbraith <efault@gmx.de> wrote:
> 
> > On Tue, 2017-08-29 at 10:58 +0200, Ingo Molnar wrote:
> > > * Mike Galbraith <efault@gmx.de> wrote:
> > > 
> > > > Greetings,
> > > > 
> > > > Take 2 of KVM bisect as you work fingered $subject.  Take 1 was stymied
> > > > by build dependencies (aa5d1b81, df340524) which I foolishly tried to
> > > > skip, leading git bisect to end up handing me a list of commits that
> > > > might be busted.  During take 2, I added those two as required.
> > > > 
> > > > Symptom is a few splats as below, with box finally hanging.  Network
> > > > comes up, but neither ssh nor console login is possible.
> > > 
> > > Just to double check, does the patch below also cure the regression?
> > > If we don't find the bug it might be safer than a full revert.
> > 
> > I reverted it, and vbox now boots.  Should I still try the below?
> 
> Would be nice, so I can stick a Tested-by on it and such!

Done, works.

	-Mike

Thread

Re: tip -ENOBOOT - bisected to locking/refcounts, x86/asm: Implement  fast refcount overflow protection Ingo Molnar <mingo@kernel.org> - 2017-08-29 11:00 +0200
  Re: tip -ENOBOOT - bisected to locking/refcounts, x86/asm:  Implement fast refcount overflow protection Mike Galbraith <efault@gmx.de> - 2017-08-29 11:30 +0200
    Re: tip -ENOBOOT - bisected to locking/refcounts, x86/asm: Implement  fast refcount overflow protection Ingo Molnar <mingo@kernel.org> - 2017-08-29 11:30 +0200
      Re: tip -ENOBOOT - bisected to locking/refcounts, x86/asm:  Implement fast refcount overflow protection Mike Galbraith <efault@gmx.de> - 2017-08-29 12:10 +0200
        Re: tip -ENOBOOT - bisected to locking/refcounts, x86/asm: Implement  fast refcount overflow protection Kees Cook <keescook@chromium.org> - 2017-08-29 17:40 +0200
          Re: tip -ENOBOOT - bisected to locking/refcounts, x86/asm:  Implement fast refcount overflow protection Mike Galbraith <efault@gmx.de> - 2017-08-29 18:40 +0200

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