[security-dev 00011]: Re: BUG: krb5 client leaks UDP, causes failure under load.

Seema Malkani Seema.Malkani at Sun.COM
Wed Aug 1 15:14:40 PDT 2007

Thanks for reporting this issue.

Apologies, don't know the details of how this report was missed. Sun 
bug-id 6588160 has been created from the webbug that you submitted.

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Jan Grant wrote:
> I've tried to raise this in the past; the opening of the relevant bits 
> of the JDK have encouraged me to try again.
> sun.security.krb5.internal.UDPClient has no close() method; and the 
> UDPClient-using code path in sun.security.krb5.KrbKdcReq (which has a 
> few other close-to-the-coalface errors) consequently leaks FDs (unlike 
> the TCP path, which has a try/finally that closes the socket properly).
> We're seeing a krb5 client application (the Yale CAS SSO) keel over in 
> no time due to FD exhaustion. A trivial fix (the non-whitespace part of 
> the diff is 8 lines) sorts this out.
> I've tried to report this in the past without much luck: engineers were 
> initially very responsive then it got picked up and kind of fell flat. 
> Whilst I'm chasing the beauracracy here to get a release signed, I think 
> the patch itself is so trivial it probably doesn't warrant much concern.
> Full report is stashed here:
> http://www.freebsd.org/cgi/query-pr.cgi?pr=110912&cat=java
> including a patch against the contents of jdk_sec-1_5_0-src-scsl.zip; 
> this affects all platforms.
> A unit test is hard to do; however if you look at support case 37763365 
> you should find a small piece of code (and associated typescipt) that 
> demonstrates the krb5 client slowly using up UDP sockets.
> Eventually the GC will kick in and reclaim these; however, (1) relying 
> on GC to manage any resource other than memory is a bug; (2) we're still 
> seeing failures before GC has a chance to work.
> Let me know what I can do to progress this; according to various reports 
> this fault has been around for a long time. It'd be good to knock it on 
> the head.
> Cheers,
> jan

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