Date: Tue, 18 Jan 2011 00:16:28 -0600 From: Javier Liendo <javier@liendo.net> To: freebsd-questions@freebsd.org Subject: dtrace/userland causing segmentation fault Message-ID: <AANLkTinhPCdkt7PzjK=SgEeHQS4tZuwT8Za9kBpvVe0G@mail.gmail.com>
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hello freebsd gurus...
i'm currently using FreeBSD 9.0-CURRENT-201101...
dtrace is enable and working
[root@ ~]# dtrace -l | tail -5
41473 profile tick-1=
000
41474 profile tick-5=
000
41475 profile tick-1=
sec
41476 database5533 db main
query-done
41477 database5533 db main
query-start
i=B4m trying to use dtrace with a very basic userland program and i=B4m
100% of the time getting segmentation faults...
------ probes definition file ------
[root@ ~]# cat simple_probes.d
provider simple {
probe loop(int);
};
------ simple program ------
[root@ ~]# cat simple.c
#include <stdio.h>
#include "simple_probes.h"
int main() {
int i;
i=3D0;
while(1) {
printf("%d\n",i);
i++;
SIMPLE_LOOP(i);
}
return(0);
}
------ the steps i use to get the program compiled are ------
[root@ ~]# dtrace -C -h -s simple_probes.d
[root@ ~]# gcc -c simple.c
[root@ ~]# dtrace -G -s simple_probes.d simple.o
[root@ ~]# gcc -lelf -o simple simple_probes.o simple.o
------ but when i run the program i always get segmentation fault >:( -----=
-
[root@ ~]# ./simple
0
Segmentation fault: 11 (core dumped)
i=B4ve been banging my head against a wall trying to troubleshoot this
issue with obviously no success...
have any of the freebsd gurus found a similar behavior in the past
regarding userland dtrace?
any pointers/links/words of encouragement will be greatly appreciated...
regards,
javier
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