The current implementation of the gecko profiler does not support mixing backtraces for C++ and JS in a profile. The current implementation iterate on the C++ stack with the backtrace function which does not provide the frame pointer of each frame. Mac implementation is using pthread_get_stackaddr_np, which can be translated with pthread_getattr_np on Linux. This bug is a short-term fix as breakpad is supposed to replace this stack walking implementation in a long-term.
Created attachment 683348 [details] [diff] [review] Use stackwalking on Linux. This is not urgent, not tested on tbpl, and is unlikely to fit all expectation. This is just a not-so dirty version of my hacky patch to mix the C++ stack with the JS stack. When testing with a browser or a few shell benchmarks, I saw a few hangs which might be related to Bug 757186. In the mean time I provide this patch because it is still useful for profiling in the xpcshell no matters if there is a hang or not.
Unassigned my-self: I am not actively work on it. And it seems to work, so maybe mark this bug as a duplicate of something else ?!
This has been fixed elsewhere.