Hi Heikki, Thanks for looking into this issue. My observations on this issue are below:- * I verified that process is in deadlock since last 4-5 days and no other process is holding any lock. * We hit this issue multiple times in regression tests but we don't have any re-producible test case. * In last 6-8 moths we hit this 2-3 times. Also we are using the latest HP-UX release 1303. * Currently we have a system with same state. Let me know what information I should collect from that machine.
Thanks & Regards, Devendra -----Original Message----- From: Heikki Linnakangas [mailto:hlinnakan...@vmware.com] Sent: Saturday, April 13, 2013 1:40 AM To: Singh, Devendra Cc: pgsql-bugs@postgresql.org Subject: Re: [BUGS] postgres 8.4 PQexec hang on HP-UX On 12.04.2013 09:41, Singh, Devendra wrote: > Hi All, > > I hit a hang issue in postgres 8.4 query. Hit this issue multiple time on > HP-UX. Below is the snapshot of the hang thread. > > -------------------------------- lwpid : 600943 > ------------------------------- > 0: c00000000054ced0 : _poll_sys() + 0x30 (/usr/lib/hpux64/libc.so.1) > 1: c000000000561560 : poll() + 0xe0 (/usr/lib/hpux64/libc.so.1) > 2: c000000001f798e0 : pqSocketPoll() at fe-misc.c:1079 > 3: c000000001f790e0 : pqWait() at fe-misc.c:1024 > 4: c000000001f6ebb0 : PQgetResult() at fe-exec.c:1554 > 5: c000000001f6f0a0 : PQexec() at fe-exec.c:1735 > > Is it a known issue? Any possible workaround ? The first thing that comes to mind is that the query is simply taking a long time to execute, or is being blocked trying to acquire a lock that another process is holding in the server. You'll have to provide a lot more details if you want anyone to make a better guess than that. A simplified test program that reproduces the problem would be best. - Heikki
