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[Bug uprobes/17623] Sometimes probes fail to fire events when running against a multi-threaded application
- From: "peter at peca dot dk" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sourceware dot org
- Date: Tue, 25 Nov 2014 10:24:38 +0000
- Subject: [Bug uprobes/17623] Sometimes probes fail to fire events when running against a multi-threaded application
- Auto-submitted: auto-generated
- References: <bug-17623-6586 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=17623
--- Comment #12 from Peter Allin <peter at peca dot dk> ---
(In reply to David Smith from comment #11)
> In theory it shouldn't, especially if you are using the script I posted that
> doesn't print at every function hit but just increments a counter.
Yes - I've been using your script with the counters.
> > I'll still try with a newer kernel tomorrow.
> Sounds good.
I have tried with a 3.17.4 kernel, and got the same results. Repeated runs
looks like this:
func1: 7845 hits, func2: 0 hits
func1: 7891 hits, func2: 7891 hits
func1: 7793 hits, func2: 7793 hits
func1: 7847 hits, func2: 7847 hits
func1: 7811 hits, func2: 7811 hits
func1: 7887 hits, func2: 0 hits
func1: 7851 hits, func2: 0 hits
func1: 7886 hits, func2: 0 hits
func1: 7800 hits, func2: 7800 hits
func1: 7889 hits, func2: 7889 hits
func1: 7877 hits, func2: 0 hits
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