APAR status
Closed as program error.
Error description
Error Message: Problem could manifest in any way since the generated code is incorrect : We could get invalid output, exception or crash depending on what the program does with the value that is incorrect. The most distinctive hint of this problem is if the user code multiplies an integer induction variable by a constant value inside the loop, e.g. for (i = n-5; i <= n; i++) { System.out.println ( i + " " + ((long)i) * 4 + "\n"); count++; if (count >= 10) break; } and "i" could overflow in the loop. In such a case, if the JIT compiler used a long induction variable instead of the original integer induction variable (after JIT optimization) then an error could occur. . Stack Trace: N/A .
Local fix
-Xjit:disableLoopStrider would work around this problem; this turns off a JIT optimization that should not affect performance noticeably
Problem summary
The problem is caused when an integer induction variable is converted to a long induction variable by a JIT optimization in cases when the integer induction variable could overflow.
Problem conclusion
This defect will be fixed in: 7.0.0 SR3 6.0.1 SR4 6.0.0 SR12 5.0.0 SR15 . The JIT compiler has been updated to prevent the problem from occurring.
Temporary fix
ZE FIX ERROR IV34696 13/01/14
Comments
APAR Information
APAR number
IV29910
Reported component name
JIT
Reported component ID
620700124
Reported release
260
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2012-10-10
Closed date
2012-10-10
Last modified date
2013-02-13
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
R260 PSY
UP
R600 PSY
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":"260","Edition":"","Line of Business":{"code":"","label":""}}]
Document Information
Modified date:
13 February 2013