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    SubjectRe: [stable] [tip:x86/urgent] x86: Add memory modify constraints to xchg() and cmpxchg()
    Hello, does not boot on my HP Compaq nx7300. I bisected it to this patch:

    On Mon, Aug 02, 2010 at 04:59:50PM -0700, Greg KH wrote:
    > On Mon, Aug 02, 2010 at 04:51:27PM -0700, Jeremy Fitzhardinge wrote:
    > > On 07/27/2010 10:33 PM, tip-bot for H. Peter Anvin wrote:
    > > >Commit-ID: 113fc5a6e8c2288619ff7e8187a6f556b7e0d372
    > > >Gitweb:
    > > >Author: H. Peter Anvin<>
    > > >AuthorDate: Tue, 27 Jul 2010 17:01:49 -0700
    > > >Committer: H. Peter Anvin<>
    > > >CommitDate: Tue, 27 Jul 2010 17:14:02 -0700
    > > >
    > > >x86: Add memory modify constraints to xchg() and cmpxchg()
    > >
    > > Here's the 2.6.32 version for stable.
    > Thanks, I'll queue it up when it hits Linus's tree.

    Here's a video of the crash:
    With boot_delay=30, it sometimes just reboots and sometimes prints the trace.
    Without it, it always prints the trace. The crash occurs during the
    initialization of intel-agp (which explains why I can't reproduce it in qemu).
    More details in the video.

    The system boots and works just fine with with the patch reverted.
    v2.6.36-rc3-185-gd56557a works fine as well, perhaps there were other fixes
    that didn't get to stable (e.g. 4532b30).

    I'm compiling the kernel with the latest gcc in Debian (-dumpversion says
    4.4.5, dpkg reports 4:4.4.4-2). Shall I post dmesg/lspci as well?

    Since I have an easy workaround and other things to do, I won't spend time
    trying to backport those other fixes myself, but if you're going to fix this,
    I will help with testing.

    Tomáš Janoušek, a.k.a. Liskni_si,
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