[Gluster-devel] Libunwind

Jeff Darcy jdarcy at redhat.com
Thu Sep 8 13:07:33 UTC 2016

In a few places in our code (e.g. gf_log_callingfn) we use the "backtrace" and "backtrace_symbols" functions from libc to log stack traces.  Unfortunately, these functions don't seem very smart about dynamically loaded libraries - such as translators, where most of our code lives.  They give us the object plus offset from where the object was loaded into memory, which isn't that easy to turn into a function name (let alone a file and line number).  It seems like libunwind can do better, getting at least to the function name.  AFAICT it's supported and packaged on all of our platforms, though there might be version differences.  Newer versions can supposedly get to file and line, which would be even better.  Before I get further into this, two questions for all of you:

(1) Has somebody already gone down this path?  Does it work?

(2) Are there any other reasons we wouldn't want to switch?

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