Hi Jeffrey,
Could you provide the version for lttng-ust, lttng-tools, lttng-modules
(if installed)?
Were you able to reproduce the issue on master (git) ?
What are the exact order of command to reproduce the problem ?
Thanks
On 2016-03-08 06:43 PM, Jeffrey Chen wrote:
Hi LTTng community:
We are using LTTng for our production environment. We have been
noticing segfault problem when our process exit. We think the problem
is due to the background thread continue to write traces, while LTTng
cleanup its memory. We do not know how to fix this issue without
changing LTTng code base. I have written a very simple app that could
repro the problem. Most of my codes are copy pasted from the LTTng doc
sample. Is there any fix that the LTTng side could do?
*_hello.c_*
#include <stdio.h>
#include "hello-tp.h"
#include <pthread.h>
void* doSomeThing(void *arg)
{
int x;
for (x = 0; x < 100000; ++x) {
tracepoint(hello_world, my_first_tracepoint, x, "test");
}
}
int main(int argc, char *argv[])
{
int x;
getchar();
pthread_t inc_x_thread;
if(pthread_create(&inc_x_thread, NULL, doSomeThing, NULL)) {
fprintf(stderr, "Error creating thread\n");
return 1;
}
tracepoint(hello_world, my_first_tracepoint, 23, "hi there!");
return 0;
}
*_hello-tp.c_*
#define TRACEPOINT_CREATE_PROBES
#define TRACEPOINT_DEFINE
#include "hello-tp.h"
*_hello-tp.h_*
#undef TRACEPOINT_PROVIDER
#define TRACEPOINT_PROVIDER hello_world
#undef TRACEPOINT_INCLUDE
#define TRACEPOINT_INCLUDE "./hello-tp.h"
#if !defined(_HELLO_TP_H) || defined(TRACEPOINT_HEADER_MULTI_READ)
#define _HELLO_TP_H
#include <lttng/tracepoint.h>
TRACEPOINT_EVENT(
hello_world,
my_first_tracepoint,
TP_ARGS(
int, my_integer_arg,
char*, my_string_arg
),
TP_FIELDS(
ctf_string(my_string_field, my_string_arg)
ctf_integer(int, my_integer_field, my_integer_arg)
)
)
#endif /* _HELLO_TP_H */
#include <lttng/tracepoint-event.h>
*_Compile_*
gcc -c -I. hello-tp.c
gcc -c hello.c
gcc -o hello hello.o hello-tp.o -llttng-ust -ldl -lpthread
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--
Jonathan R. Julien
Efficios
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