Hi all,

Firstly, I should point out that my knowledge of kernel type things is
very limited, so some of this may make little sense.

Firstly, is lpd a multithreaded application?  I ask because I'm seeing
the occasional runaway lpd process (it's always the queue server
process) which I think might be connected with multithreading under
Redhat 9.  This process uses up close to 100% of CPU time and prevents
the queue it serves from doing anything.  It will stop doing this if I
do an 'lpc kill' of the process.

What I see when doing a strace of the process is...

[monotype]root: ps -ef|grep 24016
lp       24016 13270 18 May09 ?        07:31:54 lpd (Server) 'bp8'
[monotype]root: strace -p 24016
futex(0x42133220, FUTEX_WAIT, 2, NULL <unfinished ...>
[monotype]root:

.... which some web searching reveals to be connected with NPTL,
futexes, multithreading, etc, under Redhat 9, which is where the limit
of my kernel knowledge is comfortably surpassed.

Has anyone else seen this and, more importantly, can they suggest a
fix?

Many thanks in advance
Toby Blake
University of Edinburgh


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