Re: [Xen-devel] xen: oops at atomic64_read_cx8+0x4

[Jonathan Nieder <jrnieder@xxxxxxxxx>]

Sergio Gelato wrote[1]:

>                          That 3.4.1-1~experimental.1 build
> (3.4-trunk-686-pae #1 SMP Wed Jun 6 15:11:31 UTC 2012 i686 GNU/Linux)
> is even less well-behaved under Xen: I'm getting a kernel OOPS at
> EIP: [<c1168e54>] atomic64_read_cx8+0x4/0xc SS:ESP e021:ca853c6c
> The top of the trace message unfortunately scrolled off the console before I
> could see it, and the message doesn't have time to make it to syslog (either
> local or remote).
[...]
> Non-Xen boots proceed normally.

Yeah, apparently[2] that's caused by

        commit 26c191788f18
        Author: Andrea Arcangeli <aarcange@xxxxxxxxxx>
        Date:   Tue May 29 15:06:49 2012 -0700

            mm: pmd_read_atomic: fix 32bit PAE pmd walk vs pmd_populate SMP 
race condition

which was also included in Debian kernel 3.2.19-1.

[1] http://bugs.debian.org/676360
[2] https://bugzilla.redhat.com/show_bug.cgi?id=829016#c4

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