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[Bug libc/12926] getaddrinfo()/make_request() may spin forever
- From: "ppluzhnikov at google dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: Sat, 16 Jul 2011 05:43:05 +0000
- Subject: [Bug libc/12926] getaddrinfo()/make_request() may spin forever
- Auto-submitted: auto-generated
- References: <bug-12926-131@http.sourceware.org/bugzilla/>
http://sourceware.org/bugzilla/show_bug.cgi?id=12926
Paul Pluzhnikov <ppluzhnikov at google dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |INVALID
--- Comment #1 from Paul Pluzhnikov <ppluzhnikov at google dot com> 2011-07-16 05:42:43 UTC ---
Further investigation showed that this is most likely an application (Java NIO
actually) bug.
It appears that NIO, under some conditions, may execute the following sequence
of calls:
1. accept(...) = N
2. close(N)
3. dup2(X, N) = N
which opens a race: if between 2 and 3 another thread opens N (e.g. a NETLINK
socket), that thread will lose.
In our case, the victim happened to be DNS resolver thread.
Since there is nothing glibc can really do to protect itself from such
application code, resolving as invalid.
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