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[Bug runtime/9940] double calling double calling of uprobes in shared libraries
- From: "wenji dot huang at oracle dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sources dot redhat dot com
- Date: 17 Mar 2009 10:08:37 -0000
- Subject: [Bug runtime/9940] double calling double calling of uprobes in shared libraries
- References: <20090311164601.9940.fche@redhat.com>
- Reply-to: sourceware-bugzilla at sourceware dot org
------- Additional Comments From wenji dot huang at oracle dot com 2009-03-17 10:08 -------
I found the same problem when I was developing the code of verifying build-id
for user-space probing.
The inside trick seems like,
1. mprotect cause vma change of interesting dynamic library.
2. the callback stap_uprobe_vmchange_found is triggered more than one time.
3. stap_uprobe_change is accordingly called in the callback.
4. Finally the same probe point will be successfully registered many times
in stap_uprobe_change.
--
http://sourceware.org/bugzilla/show_bug.cgi?id=9940
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