[Bug uprobes/16662] return probe breaks functionality of rsync

[jlebon at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16662

Jonathan Lebon <jlebon at redhat dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |jlebon at redhat dot com

--- Comment #2 from Jonathan Lebon <jlebon at redhat dot com> ---
(In reply to c.bezemer@tudelft.nl from comment #0)
> When I try to run the following probe:
> 
>     probe
> process("/home/jenkins/workspace/test_systemtap_rsync_unittests/rsync/
> rsync").function("*") ?
>     {
>             printf("IN %s\n", probefunc());
>     }
>      
>     probe
> process("/home/jenkins/workspace/test_systemtap_rsync_unittests/rsync/
> rsync").function("*").return
>     {
>             printf("OUT %s\n", probefunc());
>     }
> 
> The functionality of rsync breaks if the return probe is enabled. When the
> return probe is disabled, there is no problem.
> 
> dmesg contains '[3021183.636783] rsync[10263]: segfault at 7fffffffe000 ip
> 00007fffffffe000 sp 00007fff32f44130 error 14'
> 
> Kernel version: kernel 3.12-trunk-amd64
> Systemtap version: 2.4/0.157

Thanks for the report. More specifically, this occurs when placing a uretprobe
on the _start function.

Fedora BZ: https://bugzilla.redhat.com/show_bug.cgi?id=1073605
RHEL7 BZ: https://bugzilla.redhat.com/show_bug.cgi?id=1073627

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