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[Bug runtime/17362] no script-level local variables available in F20's kernel.function("do_execve")
- From: "mcermak at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sourceware dot org
- Date: Tue, 09 Sep 2014 15:19:36 +0000
- Subject: [Bug runtime/17362] no script-level local variables available in F20's kernel.function("do_execve")
- Auto-submitted: auto-generated
- References: <bug-17362-6586 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=17362
--- Comment #3 from Martin Cermak <mcermak at redhat dot com> ---
Very similar issue affecting at_var.exp. Old kernel:
=====
# rpm -q systemtap; uname -r
systemtap-2.7-1.mcermak.e454243.fc20.x86_64
3.13.9-200.fc20.x86_64
# cat systemtap.base/at_var.c
#include <sys/time.h>
struct foo
{
int bar;
};
static struct foo foo;
void sub(const char *file)
{
struct timeval times[2];
times[0].tv_sec = 1;
times[0].tv_usec = 2;
times[1].tv_sec = 3;
times[1].tv_usec = 4;
utimes (file, times);
foo.bar -= 2; /* 40 */
}
int
main (int argc, char **argv)
{
foo.bar = 41 + argc; /* 42 */
sub(argv[0]);
return 0;
}
# gcc -g systemtap.base/at_var.c
# stap -e 'probe kernel.function("SYSC_utimes") {println($utimes$$,
$utimes[1]$$, @var("utimes")$$, @var("utimes")[1]$$)}' -c ./a.out
{.tv_sec=1, .tv_usec=2}{.tv_sec=3, .tv_usec=4}{.tv_sec=1,
.tv_usec=2}{.tv_sec=3, .tv_usec=4}
#
=====
new kernel:
=====
# rpm -q systemtap; uname -r
systemtap-2.7-1.mcermak.e454243.fc20.x86_64
3.15.10-201.fc20.x86_64
# gcc -g systemtap.base/at_var.c
# stap -e 'probe kernel.function("SYSC_utimes") {println($utimes$$,
$utimes[1]$$, @var("utimes")$$, @var("utimes")[1]$$)}' -c ./a.out
{.tv_sec=?, .tv_usec=?}{.tv_sec=?, .tv_usec=?}{.tv_sec=?,
.tv_usec=?}{.tv_sec=?, .tv_usec=?}
#
=====
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