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

["c.bezemer at tudelft dot nl" <sourceware-bugzilla at sourceware dot org>]

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

            Bug ID: 16662
           Summary: return probe breaks functionality of rsync
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: uprobes
          Assignee: systemtap at sourceware dot org
          Reporter: c.bezemer at tudelft dot nl

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

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