I am install libxml2-dbg 2.7.3.dfsg-1 package, this is backtrace with it:
Program received signal SIGABRT, Aborted.
0xb7f17424 in __kernel_vsyscall ()
(gdb) bt
#0 0xb7f17424 in __kernel_vsyscall ()
#1 0xb7be0640 in *__GI_raise (sig=6) at
../nptl/sysdeps/unix/sysv/linux/raise.c:64
#2 0xb7be2008 in *__GI_abort () at abort.c:88
#3 0x082efcae in ExceptionalCondition (conditionName=0x83d6832 "!(pointer !=
((void *)0))",
errorType=0x83237a2 "FailedAssertion", fileName=0x83d682b "mcxt.c",
lineNumber=580) at assert.c:57
#4 0x0830f1cc in pfree (pointer=0x0) at mcxt.c:580
#5 0xb7df55d2 in xmlXPathCompPathExpr (ctxt=0x88a020c) at xpath.c:10312
#6 0xb7df58cd in xmlXPathCompUnaryExpr (ctxt=0x88a020c) at xpath.c:10616
#7 0xb7df5b0f in xmlXPathCompMultiplicativeExpr (ctxt=0x0) at xpath.c:10681
#8 0xb7df5cef in xmlXPathCompAdditiveExpr (ctxt=0x0) at xpath.c:10722
#9 0xb7df5e7f in xmlXPathCompRelationalExpr (ctxt=0x0) at xpath.c:10760
#10 0xb7df600f in xmlXPathCompEqualityExpr (ctxt=0x0) at xpath.c:10802
#11 0xb7df61cf in xmlXPathCompAndExpr (ctxt=0x0) at xpath.c:10833
#12 0xb7df6342 in xmlXPathCompileExpr (ctxt=0x0, sort=6) at xpath.c:10859
#13 0xb7dfd390 in xmlXPathCtxtCompile__internal_alias (ctxt=0x0, str=0x88b03d8
"count(//)") at xpath.c:14612
#14 0xb7dfd459 in xmlXPathCompile__internal_alias (str=0x88b03d8 "count(//)")
at xpath.c:14663
#15 0x082da303 in xpath (fcinfo=0xbfe322a8) at xml.c:3465
#16 0x081975bb in ExecMakeFunctionResult (fcache=0x88ae670, econtext=0x88ae5d8,
isNull=0x88aec78 "\177~\177\177\177\177\177\177��\206\b@",
isDone=0x88aecd8) at execQual.c:1351
#17 0x081951f5 in ExecProject (projInfo=0x88aec8c, isDone=0xbfe32558) at
execQual.c:4610
#18 0x081a8614 in ExecResult (node=0x88ae54c) at nodeResult.c:155
#19 0x081943ed in ExecProcNode (node=0x88ae54c) at execProcnode.c:319
#20 0x08192153 in ExecutorRun (queryDesc=0x88adb00,
direction=ForwardScanDirection, count=1) at execMain.c:1335
#21 0x0819e807 in postquel_getnext (es=0x88ada8c, fcache=0x88ad174) at
functions.c:378
#22 0x0819ecc2 in fmgr_sql (fcinfo=0xbfe327f8) at functions.c:479
#23 0x081975bb in ExecMakeFunctionResult (fcache=0x88ac668, econtext=0x88ac5d0,
isNull=0x88acd40 "", isDone=0x88acd54)
at execQual.c:1351
#24 0x081951f5 in ExecProject (projInfo=0x88acc48, isDone=0xbfe32aa8) at
execQual.c:4610
#25 0x081a8614 in ExecResult (node=0x88ac544) at nodeResult.c:155
#26 0x081943ed in ExecProcNode (node=0x88ac544) at execProcnode.c:319
#27 0x08192153 in ExecutorRun (queryDesc=0x88abfd0,
direction=ForwardScanDirection, count=0) at execMain.c:1335
#28 0x08241eab in PortalRunSelect (portal=0x88a31dc, forward=<value optimized
out>, count=0, dest=0x889a274) at pquery.c:943
#29 0x082435cd in PortalRun (portal=0x88a31dc, count=2147483647, isTopLevel=1
'\001', dest=0x889a274, altdest=0x889a274,
completionTag=0xbfe32d0a "") at pquery.c:797
#30 0x0823df8e in exec_simple_query (query_string=0x88991bc "select
xpath('count(//)', '<a></a>'::xml);") at postgres.c:1004
#31 0x0823f7fc in PostgresMain (argc=4, argv=0x8810cf4, username=0x8810cc4
"seb") at postgres.c:3631
#32 0x0820973f in ServerLoop () at postmaster.c:3207
#33 0x0820a6c3 in PostmasterMain (argc=4, argv=0x880ec88) at postmaster.c:1029
#34 0x081b8606 in main (argc=4, argv=0x880ec88) at main.c:188
--
Sergey Burladyan
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