IV19215: SEGMENTATION ERROR DURING JIT COMPILATION ON 32-BIT
Closed as program error.
Error Message: There are a number of possible error messages, but what they have in common is: - vmState begins with 0x0005 - There is a "Method_being_compiled" - InaccessibleAddress starts with a series of "F"s. Here is an example: Unhandled exception Type=Segmentation error vmState=0x00051dff J9Generic_Signal_Number=00000004 Signal_Number=0000000b Error_Value=00000000 Signal_Code=00000001 Handler1=559A570A Handler2=55A37AB7 InaccessibleAddress=FFFF5000 EDI=FFFF5000 ESI=0000EBBC EAX=00000000 EBX=5639C944 ECX=000036DC EDX=00000000 EIP=55653327 ES=002B DS=002B ESP=D943B988 EFlags=00010246 CS=0023 SS=002B EBP=D943BA68 Module=/lib/libc.so.6 Module_base_address=555DC000 Symbol=memset Symbol_address=556532F0 Method_being_compiled=com/ibm/jtc/svt/tests/invoke/AsTypeTest.te stConvertInt(I)V Target=2_60_20110805_088344 (Linux 188.8.131.52-0.5-default) CPU=x86 (8 logical CPUs) (0x3ed34c000 RAM) . Stack Trace: N/A .
64-bit builds are far less likely to exhibit this problem, so if switching to 64-bit is a viable option, that is very likely (almost certain) to make the problem disappear.
The JIT's internal memory allocator doesn't properly handle the situation where the address of allocated memory is right at the top of the address space. In that case, if an allocation request is too large to accommodate, the calculations will overflow, causing invalid pointers to be generated.
This defect will be fixed in: 7.0.0 SR1 6.0.1 SR2 WRT-V3 SR1 . The JIT has been fixed to avoid overflow in the memory allocation calculations.
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APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
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