srvctl error

Hit an strange error just now.

[oracle@racnode1 ~]$ srvctl
#
# An unexpected error has been detected by HotSpot Virtual Machine:
#
#  SIGBUS (0x7) at pc=0x42604f0a, pid=20424, tid=3077707456
#
# Java VM: Java HotSpot(TM) Client VM (1.5.0_30-b03 mixed mode, sharing)
# Problematic frame:
# /u01/app/11.2.0/grid/bin/srvctl: line 240: 20424 Segmentation fault      (core dumped) $JRE $JRE_OPTIONS -DORACLE_HOME=/u01/app/11.2.0/grid -classpath $CLASSPATH $SRVM_PROPERTY_DEFS oracle.ops.opsctl.OPSCTLDriver "$@"
[oracle@racnode1 ~]$ srvctl
#
# An unexpected error has been detected by HotSpot Virtual Machine:
#
#  SIGBUS (0x7) at pc=0x42604f0a, pid=20515, tid=3077949120
#
# Java VM: Java HotSpot(TM) Client VM (1.5.0_30-b03 mixed mode, sharing)
# Problematic frame:
# /u01/app/11.2.0/grid/bin/srvctl: line 240: 20515 Segmentation fault      (core dumped) $JRE $JRE_OPTIONS -DORACLE_HOME=/u01/app/11.2.0/grid -classpath $CLASSPATH $SRVM_PROPERTY_DEFS oracle.ops.opsctl.OPSCTLDriver "$@"

The srvctl hit error..    The error looks like java issue. So i check the java

[oracle@racnode1 ~]$ java -version
OpenJDK Client VM warning: Insufficient space for shared memory file:
   /tmp/hsperfdata_oracle/20523
Try using the -Djava.io.tmpdir= option to select an alternate temp location.

java version "1.7.0_09-icedtea"
OpenJDK Runtime Environment (rhel-2.3.4.1.0.1.el6_3-i386)
OpenJDK Client VM (build 23.2-b09, mixed mode)

　　

There is a line like this 

OpenJDK Client VM warning: Insufficient space for shared memory file:

Seems some disk is full. So i check disk usage with df -h as below. Yes the root directory is full. after housekeep problem fixed.

[oracle@racnode1 ~]$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_racnode1-lv_root
                       16G   15G     0 100% /
tmpfs                1012M  150M  862M  15% /dev/shm