[Bug runtime/9940] New: double calling double calling of uprobes in shared libraries

["fche at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

On 2.6.27.* fedora kernels, scripts that probe shared libraries
seem to receive double uprobe callbacks per event.

sudo stap -DDEBUG_TASK_FINDER -DDEBUG_TASK_FINDER_VMA -DDEBUG_UPROBES -e 'probe
process ("/lib64/libpthread.so.0").function("__sigaddset") {log(probefunc() . "
" . $$parms)}' -c ls

Running this shows two calls to __sigaddset even though only one is appropriate.
In "dmesg", there are duplicated uprobes register/unregister calls.

....
-uprobe spec 0 index 0 pid 31445 addr 000000302d805455
-uprobe spec 1 index 1 pid 31445 addr 000000302d8074ef
-uprobe spec 0 index 2 pid 31445 addr 000000302d805455
-uprobe spec 1 index 3 pid 31445 addr 000000302d8074ef
-uprobe spec 0 index 4 pid 31445 addr 000000302d805455

I suspect a problem either with task-finder or the translator-generated
uprobes registration loops.

-- 
           Summary: double calling double calling of uprobes in shared
                    libraries
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: fche at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=9940

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