Java application getting paused when pfiles or pstack command run for it

Wed Sep 7 10:33:26 UTC 2016

Hello Charlie/team,

I need your expert help on one of Production issue whereas when pfiles <JavaappPID> command whenever runs then it cause java application freeze until command get completed.(it is causing long pauses of up-to 15 seconds)

During this whole time situations appears as JVM freeze as TD’s for Application PID stopped generating, GC logs are getting paused and application stopped catering traffic.

What could be the cause of it, Application Java version is 1.6u45.(Application PID is 18387)

3 samples from Top command when pfiles ,pldd and pstack command cause Application freeze(as TD’s was also not coming we treated this as JVM freeze).

========================================================
1st Sample:
load averages:  1.11,  1.00,  0.98;                    up 68+20:03:01  21:41:59
94 processes: 91 sleeping, 1 stopped, 2 on cpu
CPU states: 85.6% idle,  0.4% user, 14.1% kernel,  0.0% iowait,  0.0% swap
Memory: 64G phys mem, 30G free mem, 16G total swap, 16G free swap

   PID USERNAME LWP PRI NICE  SIZE   RES STATE    TIME    CPU COMMAND
  5251 root       1   0   17 2872K 1396K cpu/2    0:00  6.82% pfiles 18387
18387 rkadm    999   0    0   29G   23G stop   878.5H  5.73% /usr/Java_1.6_45/bin/amd64/java -Djava.util.logging.manager=com.redknee.framewo

======================================================================
2nd Sample:
PID USERNAME LWP PRI NICE  SIZE   RES STATE    TIME    CPU COMMAND
10145 root       1   0   17 2620K 1676K cpu/2    0:00  3.90% pldd 18387
  5352 root       4   6   17   31M   27M sleep    0:01  3.33% pkgserv -N pkgchk
18387 rkadm    999  59    0   29G   23G stop   878.5H  0.82% /usr/Java_1.6_45/bin/amd64/java -Djava.util.logging.manager=com.redknee.framewo

=================================================================
3rd Sample
load averages:  1.21,  1.16,  1.15;                    up 68+18:02:37  19:41:35
88 processes: 85 sleeping, 1 stopped, 2 on cpu
CPU states: 85.9% idle,  0.2% user, 13.8% kernel,  0.0% iowait,  0.0% swap
Memory: 64G phys mem, 30G free mem, 16G total swap, 16G free swap

   PID USERNAME LWP PRI NICE  SIZE   RES STATE    TIME    CPU COMMAND
  1250 rkadm      1  30    0   28M   11M cpu/1    0:09 12.49% pstack 18387
19859 rkadm    392  59    0 3322M 2342M sleep   69.6H  0.46% /usr/Java_1.6_45/bin/java -classpath /usr/Java_1.6_45/lib/tools.jar:/opt/redkne
  1257 rkadm      1  59    0 3128K 1756K cpu/3    0:00  0.05% top -c -d 1 -s 1 100
  1024 root      12   6   17  154M  109M sleep  118:09  0.01% /opt/IBM/SCM/client/../_jvm/bin/java -Xint -Xmx128m -Djlog.logCmdPort=1953 -Dsu
15036 root      32  59    0  138M   74M sleep   85:05  0.01% /usr/java/bin/java -Dviper.fifo.path=/var/run/smc898/boot.fifo -Xmx128m -Dsun.s
  1075 noaccess  19  59    0   97M   91M sleep   69:05  0.01% /usr/java/bin/java -server -Xmx128m -XX:+UseParallelGC -XX:ParallelGCThreads=4
 18285 rkadm     23  59    0  110M   53M sleep   42:39  0.01% orbd -ORBInitialPort 20000 -port 20100
18289 rkadm     21  59    0  105M   45M sleep   42:02  0.01% orbd -ORBInitialPort 21000 -port 21100 /opt/redknee/log/rkctl.log
   185 root       1  59    0 2472K 1108K sleep   46:38  0.01% /usr/lib/inet/in.mpathd -a
  1254 root      43  59    0   47M   22M sleep   12:32  0.00% /opt/IBM/ITM/sol606/ul/bin/kulagent
  1467 root      44  59    0   61M   32M sleep  157:12  0.00% /opt/IBM/ITM/sol606/ux/bin/kuxagent
   665 root       1  59    0 9084K 2596K sleep    1:41  0.00% /usr/lib/sendmail -bd -q15m
     7 root      14  59    0   12M   10M sleep    1:58  0.00% /lib/svc/bin/svc.startd
   502 root       1  59    0 1444K  748K sleep    0:18  0.00% /usr/lib/utmpd
   676 root       1 100  -20 2652K 1424K sleep    5:32  0.00% /usr/lib/inet/xntpd
   574 root       4  59    0 6412K 3068K sleep    4:19  0.00% /usr/lib/inet/inetd start
   643 root       1  59    0 2468K 1304K sleep    0:00  0.00% /usr/lib/snmp/snmpdx -y -c /etc/snmp/conf
  4933 root       2  59    0  590M  578M sleep  499:41  0.00% /usr/bin/dsmc schedule
  5231 root       7  59    0   44M   17M sleep    2:59  0.00% /opt/IBM/ITM/sol606/ux/bin/kcawd
18387 rkadm    999  59    0   29G   23G stop   877.2H  0.00% /usr/Java_1.6_45/bin/amd64/java -Djava.util.logging.manager=com.redknee.framewo

Thanks,
Amit Mishra
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