[Bugme-new] [Bug 16612] New: [2.6.35.2 regression] Kernel panic or instant reboot on udev modules loading (intel-agp, i915)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=16612

           Summary: [2.6.35.2 regression] Kernel panic or instant reboot
                    on udev modules loading (intel-agp, i915)
           Product: Platform Specific/Hardware
           Version: 2.5
    Kernel Version: 2.6.35.2
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: blocking
          Priority: P1
         Component: i386
        AssignedTo: platform_i386 at kernel-bugs.osdl.org
        ReportedBy: t.artem at mailcity.com
        Regression: Yes


I have traced/bisected this problem to this commit:

_____________________________________________________________________________
568132624386f53e87575195d868db9afb2e9316 is the first bad commit
commit 568132624386f53e87575195d868db9afb2e9316
Author: H. Peter Anvin <hpa at zytor.com>
Date:   Tue Jul 27 17:01:49 2010 -0700

    x86: Add memory modify constraints to xchg() and cmpxchg()

    commit 113fc5a6e8c2288619ff7e8187a6f556b7e0d372 upstream.

    xchg() and cmpxchg() modify their memory operands, not merely read
    them.  For some versions of gcc the "memory" clobber has apparently
    dealt with the situation, but not for all.

    Originally-by: Linus Torvalds <torvalds at linux-foundation.org>
    Signed-off-by: H. Peter Anvin <hpa at zytor.com>
    Cc: Glauber Costa <glommer at redhat.com>
    Cc: Avi Kivity <avi at redhat.com>
    Cc: Peter Palfrader <peter at palfrader.org>
    Cc: Greg KH <gregkh at suse.de>
    Cc: Alan Cox <alan at lxorguk.ukuu.org.uk>
    Cc: Zachary Amsden <zamsden at redhat.com>
    Cc: Marcelo Tosatti <mtosatti at redhat.com>
    LKML-Reference: <4C4F7277.8050306 at zytor.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh at suse.de>

:040000 040000 4bbfbd009db6441b0b30297acc5a04732b9c215e
dadbcfd4cb8cb59f0ef3bef9bfc57880eb926179 M      arch
_____________________________________________________________________________

Reverting it on top of 2.6.35.2 fixes the problem. Please, let me know if you
need any other information from me.

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