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[LDM #BOV-866570]: LDM crashes on noaaport.admin.niu.edu, then sends the load average skyrocketing



Sounds like a problem with the code.

Tom, thanks for investigating this. I'll take a look at the code.

> Hi Gilbert and Steve,
> 
> re:
> > Just FYI, this anti-DOS feature can also be disabled by setting
> > the registry parameter "/server/enable-anti-DOS" to "FALSE". For example,
> >
> > regutil -s FALSE /server/enable-anti-DOS
> >
> > The default value of this parameter is TRUE.
> 
> After letting LDM v6.10.1 run overnight (with no problems), I stopped it this
> morning, changed the runtime link to point at v6.12.9, edited 
> ~ldm/etc/registry.xml
> and added the anti-DOS <server> tag, and restarted.  When I took a look at 
> load
> averages about 20 minutes later, they had risen to 7 and the top CPU users 
> were
> 'ldmd's:
> 
> top - 09:18:30 up 4 days, 16:12,  1 user,  load average: 7.02, 6.88, 5.03
> Tasks: 199 total,   8 running, 191 sleeping,   0 stopped,   0 zombie
> Cpu(s): 87.6%us,  0.1%sy,  0.0%ni, 12.3%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
> Mem:   6096936k total,  5010388k used,  1086548k free,   256840k buffers
> Swap:  8388600k total,        0k used,  8388600k free,  4338016k cached
> 
> PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+
> COMMAND
> 27397 ldm       25   0 1204m 2500 1376 R 100.0  0.0  20:25.93 ldmd
> 27459 ldm       25   0 1204m 2468 1360 R 100.0  0.0  19:22.15 ldmd
> 27463 ldm       25   0 1204m 2392 1352 R 100.0  0.0  19:22.71 ldmd
> 27464 ldm       25   0 1204m 2392 1356 R 100.0  0.0  19:22.71 ldmd
> 27465 ldm       25   0 1204m 2520 1356 R 100.0  0.0  19:22.63 ldmd
> 27467 ldm       25   0 1204m 2440 1356 R 100.0  0.0  19:21.21 ldmd
> 27466 ldm       25   0 1204m 2512 1352 R 99.8  0.0  19:21.48 ldmd
> 
> I then stopped the LDM (I had to kill the 'ldmd' processes by hand and
> delete and remake the LDM queue to), switched the runtime link back to
> v6.10.1 and restarted.  The load averages returned to their low values:
> 
> top - 09:25:15 up 4 days, 16:19,  1 user,  load average: 0.91, 4.47, 4.78
> Tasks: 199 total,   1 running, 198 sleeping,   0 stopped,   0 zombie
> Cpu(s):  0.3%us,  0.7%sy,  0.0%ni, 98.5%id,  0.0%wa,  0.2%hi,  0.4%si,  0.0%st
> Mem:   6096936k total,  5025332k used,  1071604k free,   258056k buffers
> Swap:  8388600k total,        0k used,  8388600k free,  4338016k cached
> 
> PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
> 29332 ldm       16   0 1199m 232m 231m S  1.0  3.9   0:00.20 ldmd
> 29338 ldm       16   0 1199m 110m 109m S  1.0  1.8   0:00.59 ldmd
> 29249 ldm       16   0 1198m 110m 109m S  0.7  1.9   0:01.08 rtstats
> 29254 ldm       15   0 1199m 230m 229m S  0.7  3.9   0:00.53 ldmd
> 29274 ldm       16   0 1199m 110m 109m S  0.7  1.9   0:00.84 ldmd
> 29337 ldm       16   0 1199m 110m 109m S  0.7  1.8   0:00.58 ldmd
> 4059 root      16   0 10256  704  608 S  0.3  0.0   0:27.20 hald-addon-stor
> 11222 root      15   0     0    0    0 S  0.3  0.0   0:00.58 pdflush
> 29251 ldm       15   0 1231m 261m 240m S  0.3  4.4   0:00.73 ldmd
> 29253 ldm       15   0 1199m 171m 170m S  0.3  2.9   0:00.84 ldmd
> 29266 ldm       16   0 1199m 110m 109m S  0.3  1.9   0:00.87 ldmd
> 29268 ldm       16   0 1199m 240m 239m S  0.3  4.0   0:00.53 ldmd
> 29342 ldm       16   0 1199m 110m 109m S  0.3  1.8   0:00.57 ldmd
> 
> My surmise from yesterday afternoon appears to stand.
> 
> Cheers,
> 
> Tom
> --
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Regards,
Steve Emmerson

Ticket Details
===================
Ticket ID: BOV-866570
Department: Support LDM
Priority: Normal
Status: Open


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