APAR status
Closed as program error.
Error description
Error Message: SIGSEGV executing JIT compiled code. Other symptoms are possible because of Java heap corruption due to this error. . Stack Trace: N/A . The problem can only occur when using a byte or short variable as the array index and only if the upper limit of the loop is larger than can be represented by the variable (e.g. >127 for byte or >32767 for short).
Local fix
The problem can be avoided by using the following Java command line option: -Xjit:disableLoopVersioner Using the above option will degrade performance between 5 and 10 percent, depending on the application.
Problem summary
The JIT was removing bound checks when there is a possibility that the array index will overflow to a negative value, resulting reading or writing to negative offsets.
Problem conclusion
This defect will be fixed in: 5.0.0 SR13 6.0.0 SR10 . The JIT was modified to prevent this problem from occuring. . To obtain the fix: Install build 20110323 or later
Temporary fix
Comments
APAR Information
APAR number
IZ98871
Reported component name
JIT
Reported component ID
620700124
Reported release
600
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2011-04-20
Closed date
2011-04-20
Last modified date
2011-04-20
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
JIT
Fixed component ID
620700124
Applicable component levels
R600 PSN
UP
[{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSC9HBA","label":"Just In Time (JIT) Compiler"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"6.0","Edition":"","Line of Business":{"code":"","label":""}}]
Document Information
Modified date:
20 April 2011