Hi, On 2016-07-20 12:45:04 -0400, Tom Lane wrote: > I wrote: > > I've still had no luck reproducing it here, though.
Same here so far. > Hah --- I take that back. On about the fourth or fifth trial: Interesting. > ==00:00:00:34.291 21525== Invalid read of size 1 > ==00:00:00:34.291 21525== at 0x4A08DEC: memcpy (mc_replace_strmem.c:882) > ==00:00:00:34.291 21525== by 0x66FA54: DecodeXLogTuple (decode.c:899) > ==00:00:00:34.291 21525== by 0x670561: LogicalDecodingProcessRecord > (decode.c:711) > ==00:00:00:34.291 21525== by 0x671BC3: pg_logical_slot_get_changes_guts > (logicalfuncs.c:440) > ==00:00:00:34.291 21525== by 0x5C0B6B: ExecMakeTableFunctionResult > (execQual.c:2196) > ==00:00:00:34.291 21525== by 0x5D4131: FunctionNext (nodeFunctionscan.c:95) > ==00:00:00:34.291 21525== by 0x5C170D: ExecScan (execScan.c:82) > ==00:00:00:34.291 21525== by 0x5BA007: ExecProcNode (execProcnode.c:426) > ==00:00:00:34.291 21525== by 0x5B8A61: standard_ExecutorRun > (execMain.c:1490) > ==00:00:00:34.291 21525== by 0x6BFE36: PortalRunSelect (pquery.c:942) > ==00:00:00:34.291 21525== by 0x6C11EF: PortalRun (pquery.c:786) > ==00:00:00:34.291 21525== by 0x6BD7E3: exec_simple_query (postgres.c:1072) > ==00:00:00:34.291 21525== Address 0xe5311d6 is 6 bytes after a block of size > 8,192 alloc'd > ==00:00:00:34.291 21525== at 0x4A06A2E: malloc (vg_replace_malloc.c:270) > ==00:00:00:34.291 21525== by 0x4ED399: XLogReaderAllocate (xlogreader.c:83) > ==00:00:00:34.291 21525== by 0x6710B3: StartupDecodingContext > (logical.c:161) > ==00:00:00:34.291 21525== by 0x671303: CreateDecodingContext > (logical.c:413) > ==00:00:00:34.291 21525== by 0x671AF7: pg_logical_slot_get_changes_guts > (logicalfuncs.c:394) > ==00:00:00:34.291 21525== by 0x5C0B6B: ExecMakeTableFunctionResult > (execQual.c:2196) > ==00:00:00:34.291 21525== by 0x5D4131: FunctionNext (nodeFunctionscan.c:95) > ==00:00:00:34.291 21525== by 0x5C170D: ExecScan (execScan.c:82) > ==00:00:00:34.291 21525== by 0x5BA007: ExecProcNode (execProcnode.c:426) > ==00:00:00:34.291 21525== by 0x5B8A61: standard_ExecutorRun > (execMain.c:1490) > ==00:00:00:34.291 21525== by 0x6BFE36: PortalRunSelect (pquery.c:942) > ==00:00:00:34.291 21525== by 0x6C11EF: PortalRun (pquery.c:786) > ==00:00:00:34.291 21525== > This is rather interesting because I do not recall that any of skink's > failures have shown an access more than 1 byte past the end of the buffer. > > Any suggestions how to debug this? I guess either using valgrind's gdb server on error, or putting some asserts checking the size would be best. I can look into it, but it'll not be today likely. Regards, Andres -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
