[cups.general] CUPS nailling CPU & unresponsive

[Adam Tauno Williams]

OS: LINUX. CentOS5  (2.6.18-8.1.4.el5 #1 SMP)
CUPS: cups-1.2.4-11.5.1.el5

I've had a CUPS 1.1.x server for ages that worked great;  but since
upgraded to CUPS 1.2.x things have been pretty rough.

Everything works,  but seems slow,  and occasionally a print job process
like -
15266 ?        R      9:36 ipp://lpd02314/ipp 25754 dstevens
smbprn.00000231 http://maps.google.com/maps?f=d&hl=en&saddr=1183+old+us
+23,+bri 1
job-uuid=urn:uuid:cfea28fe-7510-30f2-4f9f-21ab5341ba2d /var/spool/cups/d25754-001 - will just start chewing up CPU and never printing.  The CPU will become nailed, split between this process and the CUPs daemon itself.  The HTTP interface of CUPS becomes unresponsive.  Attempting to kill -15 the child process will have no effect (or appears to have none).  If I kill -9 the child process then the CUPS daemon itself starts to eat up all the CPU.  Eventually I just whack the CUPS daemon and restart the service and then everything is good for awhile.

If I attach to the run away child with strace it just looks like -
time(NULL)                              = 1181151919
recv(5, "", 2048, 0)                    = 0
time(NULL)                              = 1181151919
recv(5, "", 2048, 0)                    = 0
time(NULL)                              = 1181151919
recv(5, "", 2048, 0)                    = 0
time(NULL)                              = 1181151919
recv(5, "", 2048, 0)                    = 0
time(NULL)                              = 1181151919
recv(5, "", 2048, 0)                    = 0
time(NULL)                              = 1181151919
recv(5, "", 2048, 0)                    = 0
time(NULL)                              = 1181151919
recv(5, "", 2048, 0)                    = 0
time(NULL)                              = 1181151919
recv(5, "", 2048, 0)                    = 0
time(NULL)                              = 1181151919
recv(5, "", 2048, 0)                    = 0
time(NULL)                              = 1181151919
recv(5, "", 2048, 0)                    = 0
time(NULL)                              = 1181151919


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