iovisor / iovisor/bcc

cannot see pthread_cond_wait on offcpu graph

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Description

![image](https://github.com/iovisor/bcc/assets/5157680/24445848-5872-4a28-a93b-a8c671aba952)

I use `-O0 -g -fno-omit-frame-poiner` to build my test program.

I can see the full stack in gdb. But when I use offcpu to get off-cpu graph, I can only see `__futex_abstimed_wait_common` function , cannot see `pthread_cond_clockwait`. They're all in libc.so, how does that differ ?

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