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Valgrind frontend sometimes misses new threads #2

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mikelui opened this issue Jun 15, 2018 · 0 comments
Open

Valgrind frontend sometimes misses new threads #2

mikelui opened this issue Jun 15, 2018 · 0 comments
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bug Something isn't working frontend/valgrind

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@mikelui
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mikelui commented Jun 15, 2018

Sigrind, the modified Callgrind tool, uses Callgrind's implementation of differentiating threads which can sometimes miss new threads.

This is because Callgrind uses Valgrind's internal thread id's, which reuses id's of exited threads.

So the following can happen:

Created - tid 1
Created - tid 2
Created - tid 3
Created - tid 4
Exited  - tid 2
Created - tid 2 <-- **Reusing old thread id** should be unique tid 5!

Prism will then conflate events from unique tid 2 and unique tid 5, treating them as coming from the same thread.
@mikelui mikelui added bug Something isn't working frontend/valgrind labels Jun 15, 2018
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