unw_get_proc_name() sporadically returns UNW_EUNSPEC and UNW_ENOINFO errors

[Amir Saman Memaripour]

Hello everyone, 

I am using libunwind 1.4.0 to collect the stack-trace. It almost always works, but there are cases that I either get unspecified (general) error or no unwind info found when calling unw_get_proc_name. I can walk through the stack-trace in core-dumps (using gdb), and the same binary on the same machine runs without any issues the next time I run the program. Anyone experienced a similar issue and knows how to fix this?

Best regards
Amirsaman Memaripour