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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: 18 Mar 2009 08:51:08 -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 2009-03-18 08:51 -------
(In reply to comment #3)
> Have a deeper investigation. mprotect is not the culprit.
>
> The duplication is from __stp_utrace_task_finder_target_syscall_exit.
> When we didn't find a file based vma to store in the syscall_entry
> routine, invoking vm_callback with register_p=1 can cause multiple
> registering same probe point.
>
>
A little clarification. In vm_callback - stap_uprobe_vmchange_found, it is
map_p=1, finally becomes register_p=1 in stap_uprobe_change.
--
http://sourceware.org/bugzilla/show_bug.cgi?id=9940
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