From: "tschan+sourceware at devzone dot ch" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug uprobes/14774] New: process.statement("*@file:*") probes don't match all functions
Date: Sat, 27 Oct 2012 15:14:00 -0000 [thread overview]
Message-ID: <bug-14774-6586@http.sourceware.org/bugzilla/> (raw)
http://sourceware.org/bugzilla/show_bug.cgi?id=14774
Bug #: 14774
Summary: process.statement("*@file:*") probes don't match all
functions
Product: systemtap
Version: unspecified
Status: NEW
Severity: minor
Priority: P2
Component: uprobes
AssignedTo: systemtap@sourceware.org
ReportedBy: tschan+sourceware@devzone.ch
Classification: Unclassified
Description of problem:
process.statement("*@file:*") probes only match a "random" subset of the
functions in the given file.
Version-Release number of selected component (if applicable):
1.7-5 on RHEL 6.
How reproducible:
Always
Steps to Reproduce:
1. Create staptest.c
#include <stdio.h>
void a()
{
printf("a\n");
}
void b()
{
printf("b\n");
}
void c()
{
printf("c\n");
}
int main()
{
a();
b();
c();
return 0;
}
2. compile staptest: gcc -g staptest.c -o staptest
3. run systemtap: stap -e 'probe process.statement("*@staptest.c:*") {
log(pp()) }' -c ./staptest
Actual results:
Only functions main and c are matched:
a
b
c
process("/home/tschan/stap/staptest").statement("main@/home/tschan/stap/staptest.c:19")
process("/home/tschan/stap/staptest").statement("main@/home/tschan/stap/staptest.c:20")
process("/home/tschan/stap/staptest").statement("main@/home/tschan/stap/staptest.c:21")
process("/home/tschan/stap/staptest").statement("main@/home/tschan/stap/staptest.c:22")
process("/home/tschan/stap/staptest").statement("c@/home/tschan/stap/staptest.c:14")
process("/home/tschan/stap/staptest").statement("c@/home/tschan/stap/staptest.c:15")
process("/home/tschan/stap/staptest").statement("c@/home/tschan/stap/staptest.c:16")
process("/home/tschan/stap/staptest").statement("main@/home/tschan/stap/staptest.c:23")
process("/home/tschan/stap/staptest").statement("main@/home/tschan/stap/staptest.c:24")
Expected results:
All functions are matched:
a
b
c
process("/home/tschan/stap/staptest").statement("main@/home/tschan/stap/staptest.c:19")
process("/home/tschan/stap/staptest").statement("main@/home/tschan/stap/staptest.c:20")
process("/home/tschan/stap/staptest").statement("a@/home/tschan/stap/staptest.c:4")
process("/home/tschan/stap/staptest").statement("a@/home/tschan/stap/staptest.c:5")
process("/home/tschan/stap/staptest").statement("a@/home/tschan/stap/staptest.c:6")
process("/home/tschan/stap/staptest").statement("main@/home/tschan/stap/staptest.c:21")
process("/home/tschan/stap/staptest").statement("b@/home/tschan/stap/staptest.c:9")
process("/home/tschan/stap/staptest").statement("b@/home/tschan/stap/staptest.c:10")
process("/home/tschan/stap/staptest").statement("b@/home/tschan/stap/staptest.c:11")
process("/home/tschan/stap/staptest").statement("main@/home/tschan/stap/staptest.c:22")
process("/home/tschan/stap/staptest").statement("c@/home/tschan/stap/staptest.c:14")
process("/home/tschan/stap/staptest").statement("c@/home/tschan/stap/staptest.c:15")
process("/home/tschan/stap/staptest").statement("c@/home/tschan/stap/staptest.c:16")
process("/home/tschan/stap/staptest").statement("main@/home/tschan/stap/staptest.c:23")
process("/home/tschan/stap/staptest").statement("main@/home/tschan/stap/staptest.c:24")
Additional info:
Changing the order of the definitions of a, b, c in staptest.c changes how many
and which functions are matched.
The probe 'process.statement("*@file:1-99999")' correctly matches all functions
and can be used as a workaround.
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next reply other threads:[~2012-10-27 15:14 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-27 15:14 tschan+sourceware at devzone dot ch [this message]
2012-10-27 16:11 ` [Bug uprobes/14774] " tschan+sourceware at devzone dot ch
2012-10-27 16:22 ` [Bug translator/14774] " fche at redhat dot com
2012-10-27 22:38 ` tschan+sourceware at devzone dot ch
2012-10-27 23:38 ` fche at redhat dot com
2012-10-29 20:01 ` fche at redhat dot com
2012-10-30 11:52 ` tschan+sourceware at devzone dot ch
2012-10-30 15:08 ` fche at redhat dot com
2012-11-03 19:19 ` tschan+sourceware at devzone dot ch
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