* [Bug runtime/17392] New: fib.exp broken on rhel7 and f20
@ 2014-09-15 11:07 mcermak at redhat dot com
2014-10-09 23:41 ` [Bug runtime/17392] " fche at redhat dot com
0 siblings, 1 reply; 2+ messages in thread
From: mcermak at redhat dot com @ 2014-09-15 11:07 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=17392
Bug ID: 17392
Summary: fib.exp broken on rhel7 and f20
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: runtime
Assignee: systemtap at sourceware dot org
Reporter: mcermak at redhat dot com
The fib.exp testcase works on RHEL6, but is broken on RHEL7 and f20, since
print_ubacktrace{,_brief}() doesn't return expected output there. It looks like
the user-level root cause is simply presence of the .return probe:
7.0 S x86_64 # cat test.c
void f3(void){}
void f2(void){f3();}
void f1(void){f2();}
void f0(void){f1();}
int main() {
f0();
return 0;
}
7.0 S x86_64 # gcc -g test.c
7.0 S x86_64 # stap -e 'probe process.function("f3")
{print_ubacktrace_brief(); printf("\n")} probe process.function("f3").return
{log("hey")}' -c './a.out'
f3+0x4
0x7fffffffe000
hey
7.0 S x86_64 # stap -e 'probe process.function("f3")
{print_ubacktrace_brief(); printf("\n")}' -c './a.out'
f3+0x4
f2+0x9
f1+0x9
f0+0x9
main+0x9
0x7fc7930beaf5
WARNING: Missing unwind data for module, rerun with 'stap -d
/usr/lib64/libc-2.17.so'
7.0 S x86_64 #
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* [Bug runtime/17392] fib.exp broken on rhel7 and f20
2014-09-15 11:07 [Bug runtime/17392] New: fib.exp broken on rhel7 and f20 mcermak at redhat dot com
@ 2014-10-09 23:41 ` fche at redhat dot com
0 siblings, 0 replies; 2+ messages in thread
From: fche at redhat dot com @ 2014-10-09 23:41 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=17392
Frank Ch. Eigler <fche at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |fche at redhat dot com,
| |jistone at redhat dot com
Resolution|--- |WONTFIX
--- Comment #1 from Frank Ch. Eigler <fche at redhat dot com> ---
This appears to be a limitation of the in-kernel inode-uprobes
implementation. It does not supply uretprobe_instance information
to the runtime to assist tracebacks over uretprobe-modified frames.
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2014-09-15 11:07 [Bug runtime/17392] New: fib.exp broken on rhel7 and f20 mcermak at redhat dot com
2014-10-09 23:41 ` [Bug runtime/17392] " fche at redhat dot com
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