Hello All, We are getting the following core more oftenly.But We don't have a test case where it is guaranteed to dump this core.We are using 7.4.2 version postgres and if any one of you aware about some bug fixes happened around this problem.Please let us know. Thanks, Prasanna. Core was generated by `postmaster'. Program terminated with signal 10, Bus error. BUS_ADRALN - Invalid address alignment #0 0x449c210:0 in HeapTupleSatisfiesNow+0xb0 () (gdb) bt #0 0x449c210:0 in HeapTupleSatisfiesNow+0xb0 () #1 0x40ec3f0:0 in heap_fetch+0x6f0 () #2 0x41c1940:0 in analyze_rel+0x1540 () #3 0x42351d0:0 in vacuum+0x370 () #4 0x436adb0:0 in ProcessUtility+0xb00 () #5 0x4367b50:0 in PortalRunUtility+0x1c0 () #6 0x4368600:0 in PortalRun+0x950 () #7 0x435eab0:0 in exec_simple_query+0x530 () #8 0x4364550:0 in PostgresMain+0x45a0 () #9 0x4301c50:0 in ServerLoop+0x15e0 () #10 0x4306050:0 in PostmasterMain+0x2050 () #11 0x42858c0:0 in main+0x470 ()