Public bug reported:
== Comment: #0 - David J. Wilder <[email protected]> - 2015-07-15 19:51:49 ==
---Problem Description---
User probes on ppc64le are not returning the correct values of the probed
function's arguments.
Contact Information = [email protected]
---uname output---
Linux Daves-sandbox 3.19.0-21-generic #21-Ubuntu SMP Sun Jun 14 19:33:37 UTC
2015 ppc64le ppc64le ppc64le GNU/Linux
Machine Type = 8284-22A (power8, running on a VM on top of powerKVM)
---Debugger---
A debugger is not configured
---Steps to Reproduce---
$ cat doit.c
#include <stdio.h>
doit( int i )
{
printf("%s: i=%d\n",__func__,i);
pause();
}
main()
{
doit(42);
}
$ cat doit.stp
probe process("doit").function("doit") {
printf("function doit called with i=%ld\n",$i);
}
$ gcc -g -o doit doit.c
$ sudo stap doit.stp -c ./doit
doit: i=42
function doit called with i=16383 <<<< I expect 42
---------
If I run the same example on a x86-64 system I get the expected results.
So I think this is a problem with ppc64 only.
$ uname -a
Linux ubuntu-15 3.19.0-15-generic #15-Ubuntu SMP Thu Apr 16 23:32:37 UTC 2015
x86_64 x86_64 x86_64 GNU/Linux
$ sudo stap doit.stp -c ./doit
doit: i=42
function doit called with i=42
Other information (from ppc64le system):
I build systemtap from upstream git. The version Canonical is shipping
is broken.
$ stap --version
Systemtap translator/driver (version 2.9/0.160, commit
release-2.8-19-ga7396f637e7c)
Copyright (C) 2005-2015 Red Hat, Inc. and others
This is free software; see the source for copying conditions.
enabled features: TR1_UNORDERED_MAP NLS
$ grep CONFIG_UPROBES /boot/config-`uname -r`
CONFIG_UPROBES=y
----------------------------------------------------
Userspace tool common name: stap
The userspace tool has the following bit modes: 64-bit
Userspace rpm: systemtap
Userspace tool obtained from project website: na
*Additional Instructions for [email protected]:
-Post a private note with access information to the machine that the bug is
occuring on.
-Attach ltrace and strace of userspace application.
Please cherry pick the fix.
https://www.sourceware.org/git/?p=systemtap.git;a=commit;h=b0cfcdb4886be5654e94cd7893a01531345e961d
https://www.sourceware.org/git/?p=systemtap.git;a=commit;h=c3d8c09c03abd4b212a24b94601a7d5a2d9b74a1
** Affects: systemtap (Ubuntu)
Importance: Undecided
Assignee: Taco Screen team (taco-screen-team)
Status: New
** Tags: architecture-ppc64le bugnameltc-127718 severity-medium
targetmilestone-inin1704
** Tags added: architecture-ppc64le bugnameltc-127718 severity-medium
targetmilestone-inin1704
** Changed in: ubuntu
Assignee: (unassigned) => Taco Screen team (taco-screen-team)
** Package changed: ubuntu => systemtap (Ubuntu)
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https://bugs.launchpad.net/bugs/1659185
Title:
User probes on ppc64le are not returning the correct values of the
probed function's arguments.
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