On 20.09.2011 21:30, Daniel Shahaf wrote:
ack, did you intend to CC the list too?
Ups. Yes, of course. CC now.
Stefan Küng wrote on Tue, Sep 20, 2011 at 21:17:57 +0200:
On 20.09.2011 20:53, Daniel Shahaf wrote:
Mattias Engdegård (CC'd) reports on IRC that apr_atomic_xchgptr() in
recent APR's is broken, and the brokenness can affect Subversion under
certain circumstances:
<@danielsh> wayita: t
< wayita> gcc 4.0.x or older
< wayita> apr 1.3.x or newer
< wayita> x86-64 only
< wayita> WORKAROUND: --disable-nonportable-atomics to APR's configure
< wayita> OS: any unix
< wayita> nature of the bug: apr_atomic_xchgptr() does not initialize the
return value
< wayita> https://issues.apache.org/bugzilla/show_bug.cgi?id=51851
< wayita> manifests as a segfault in svn.
I suppose we could recommend --disable-nonportable-atomics in the
release notes. It is undetermined at this time whether Windows 64-bit
is affected.
At least for the Visual Studio compiler, it definitely is not
affected for x64 since there's no inline assembler for x64:
http://msdn.microsoft.com/en-us/library/wbk4z78b.aspx
Stefan
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