[Bug translator/29801] --monitor mode gets 2 hits to procfs("monitor_control").write for every 1 write

[fche at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29801

Frank Ch. Eigler <fche at redhat dot com> changed:

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                 CC|                            |fche at redhat dot com

--- Comment #1 from Frank Ch. Eigler <fche at redhat dot com> ---
Nice analysis.

I suspect the problem originates from the setup_timeout() code that implements
the stap -T NNN function.  Its join_group etc. stuff was probably buggy, and
was copy-pasted into the monitor-related synthetic probe stuff.

I think the right fix there is to drop the dp->join_group(s); in each of those
clones, because synthetic derived_probe objects are joined at the other area
you found.

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