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I need the debug symbols for libc on Ubuntu 20.04 for performance profiling in gperftools (or perf). I checked how to install them and used:

sudo apt-get install libc6-dbg

After successfull Installation I don't find any libc related files in /usr/lib/debug. What could be the issue?

purge and repeated install did not help.

The version of libc shown matches my system version 2.31-0ubuntu9.15.

I found this thread which seems related How to Install Debug Symbols for libc on Ubuntu 22.04?. The only answer points to this forum entry https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1918035.

When I search for the debug info that way I get an entry in a hidden folder. However I'm not sure what to do with it:

$ dpkg -L libc6-dbg | grep $(readelf -n /lib/x86_64-linux-gnu/ld-2.31.so | grep 'Build ID' | awk '{print $3}' | cut -c 3-)
/usr/lib/debug/.build-id/c9/a47e328eb2f1f41bcbcf31f9c11b9e17aa2a83.debug
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  • Are you sure ? I get a error (can not found package) when I run sudo apt-get install libc6-dbg on Ubuntu 20.04. Commented May 24, 2024 at 10:27
  • "Unsure what to do with it" - usually, you need not do anything. Your debugger should find it just fine where it is. Commented May 24, 2024 at 10:31
  • @life888888 Yes, I get "libc6-dbg is already the newest version (2.31-0ubuntu9.15)." when retrying. Commented May 24, 2024 at 10:37
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    And you're sure that it's the debug symbols for ld-2.31.so that you want, and not the ones for libc.so.6? Commented May 24, 2024 at 12:11
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    Couple things. First, gperftools ships really old and deprecated pprof implementation (see e.g. bugs.debian.org/cgi-bin/bugreport.cgi?bug=1049383). You should (manually for now) get go implementation from github.com/google/pprof. Second, PPROF_BINARY_PATH is path to pprof program. And it invokes addr2line and similar tools. It is up to them to handle debug info. Commented May 27, 2024 at 12:24
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