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20051208: LDM refuse to start with assertion error

>From: David YEUNG <address@hidden>
>Organization: CCAR HKUST
>Keywords: 200512080652.jB86qB7s009443 LDM assertion failure

Hi David,

re:
>Our LDM suddenly stopped with following error:
>
>Dec 08 05:24:22 rcz006 atm[13870]: assertion "n > 0" failed: file "pq.c", line 
>2187
>Dec 08 05:24:28 rcz006 rpc.ldmd[13865]: child 13870 terminated by signal 6
>Dec 08 05:24:28 rcz006 rpc.ldmd[13865]: Killing (SIGINT) process group
>Dec 08 05:24:28 rcz006 rpc.ldmd[13865]: SIGINT
>Dec 08 05:24:28 rcz006 rtstats[13869]: Interrupt
>Dec 08 05:24:28 rcz006 idd[13871]: SIGINT
>Dec 08 05:24:28 rcz006 rtstats[13869]: Exiting Dec 08 05:24:28 rcz006 
>rpc.ldmd[13865]: Terminating process group
>
>And I tried to restart it and still failed:
>
>Dec 08 05:40:01 rcz006 rpc.ldmd[8913]: Starting Up (version: 6.0.14; built: Oct
>1 2003 09:48:41)
>Dec 08 05:40:01 rcz006 atm[8918]: Starting Up(6.0.14): atm.geo.nsf.gov: 
>TS_ZERO TS_ENDT {{IDS|DDPLUS,  ".*"}}
>Dec 08 05:40:01 rcz006 atm[8918]: Desired product class: 20051208044001.982 
>TS_ENDT {{IDS|DDPLUS,  ".*"}}
>Dec 08 05:40:01 rcz006 idd[8919]: Starting Up(6.0.14): idd.unidata.ucar.edu: 
>TS_ZERO TS_ENDT {{IDS|DDPLUS,  ".*"}}
>Dec 08 05:40:01 rcz006 idd[8919]: Desired product class: 20051208044001.983 
>TS_ENDT {{IDS|DDPLUS,  ".*"}}
>Dec 08 05:40:02 rcz006 rtstats[8917]: Starting Up (8913)
>Dec 08 05:40:02 rcz006 idd[8919]: Connected to upstream LDM-6
>Dec 08 05:40:02 rcz006 atm[8918]: Connected to upstream LDM-6
>Dec 08 05:40:02 rcz006 idd[8919]: Upstream LDM is willing to feed
>Dec 08 05:40:02 rcz006 atm[8918]: Upstream LDM is willing to feed
>Dec 08 05:41:09 rcz006 atm[8918]: assertion "n > 0" failed: file "pq.c", line 
>2187
>Dec 08 05:41:15 rcz006 rpc.ldmd[8913]: child 8918 terminated by signal 6
>Dec 08 05:41:15 rcz006 rpc.ldmd[8913]: Killing (SIGINT) process group
>Dec 08 05:41:15 rcz006 rpc.ldmd[8913]: SIGINT
>Dec 08 05:41:15 rcz006 rtstats[8917]: Interrupt
>Dec 08 05:41:15 rcz006 rtstats[8917]: Exiting
>Dec 08 05:41:15 rcz006 idd[8919]: SIGINT
>Dec 08 05:41:15 rcz006 rpc.ldmd[8913]: Terminating process group
>
>I have even rebooted the machine and it doesn't help.
>We are running LDM 6.0.14 on RedHat9.
>Could you kindly help? We can't get any LDM data now.

The assertion failure indicated that there was most likely something
wrong with your LDM queue (what exactly, I can't say just yet).  The
action I would have taken at this point would be to delete and remake
the queue and then restart:

<as 'ldm'>
ldmadmin clean
ldmadmin delqueue
ldmadmin mkqueue -f
ldmadmin start

>The problem is gone after I upgrade the LDM to the latest version (6.4.4).
>Is the problem related to the old version LDM I was using?

I don't think so.  Upgrading to a current version of the LDM, however,
was something that I was toing to recommend anyway.

I will look further into the assertion error and see if I can figure out
what was going on.

>Regards

Cheers,

Tom Yoksas
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