Hi, testing master as of fe591f8bf6 produced a crash reading pg_stat_activity (backtrace below). Digging around with with gdb revealed that pgstat_get_wait_event() returned an invalid pointer for a classId PG_WAIT_LWLOCK.
I think the culprit is dsa.c passing a pointer to memory that goes away on dsa_free() as a name to LWLockRegisterTranche. regards, Andreas Program terminated with signal SIGSEGV, Segmentation fault. #0 strlen () at ../sysdeps/x86_64/strlen.S:106 (gdb) bt #1 0x00000000007e03c9 in cstring_to_text (s=0x7fab18d1f954 <error: Cannot access memory at address 0x7fab18d1f954>) at varlena.c:152 #2 0x0000000000792d7c in pg_stat_get_activity (fcinfo=<optimized out>) at pgstatfuncs.c:805 #3 0x00000000005f0af5 in ExecMakeTableFunctionResult (funcexpr=0x5469f90, econtext=0x5469c80, argContext=<optimized out>, expectedDesc=0x387b2b0, randomAccess=0 '\000') at execQual.c:2216 #4 0x0000000000608633 in FunctionNext (node=node@entry=0x5469b68) at nodeFunctionscan.c:94 #5 0x00000000005f2c22 in ExecScanFetch (recheckMtd=0x608390 <FunctionRecheck>, accessMtd=0x6083a0 <FunctionNext>, node=0x5469b68) at execScan.c:95 #6 ExecScan (node=node@entry=0x5469b68, accessMtd=accessMtd@entry=0x6083a0 <FunctionNext>, recheckMtd=recheckMtd@entry=0x608390 <FunctionRecheck>) at execScan.c:180 #7 0x000000000060867f in ExecFunctionScan (node=node@entry=0x5469b68) at nodeFunctionscan.c:268 #8 0x00000000005eb4c8 in ExecProcNode (node=node@entry=0x5469b68) at execProcnode.c:449 #9 0x0000000000602cd0 in ExecLimit (node=node@entry=0x54697f0) at nodeLimit.c:91 #10 0x00000000005eb368 in ExecProcNode (node=node@entry=0x54697f0) at execProcnode.c:531 [...] -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
