Debuginfod - FAQ
What releases of Ubuntu are supported by the service?
debuginfod is currently indexing
ddebs packages from all supported Ubuntu releases. Once a release goes unsupported, we stop indexing
ddebs from it and eventually stop serving debug symbols for its packages.
debuginfod know how to find the debug symbols for the binary I am debugging?
debuginfod relies on a unique hash that identifies binaries and shared libraries called Build-ID. This 160-bit SHA-1 hash is generated by the compiler, and can be consulted using tools like
$ readelf -n /usr/bin/bash Displaying notes found in: .note.gnu.property Owner Data size Description GNU 0x00000020 NT_GNU_PROPERTY_TYPE_0 Properties: x86 feature: IBT, SHSTK x86 ISA needed: x86-64-baseline Displaying notes found in: .note.gnu.build-id Owner Data size Description GNU 0x00000014 NT_GNU_BUILD_ID (unique build ID bitstring) Build ID: 3e770d2cd0302c6ff2a184e8d2bf4ec98cfcded4 Displaying notes found in: .note.ABI-tag Owner Data size Description GNU 0x00000010 NT_GNU_ABI_TAG (ABI version tag) OS: Linux, ABI: 3.2.0
When you are debugging a program, GDB will send the program’s Build-ID to the
debuginfod server, who will check if it has the corresponding debug information for that binary/library. If it does, then it will send the debug symbols over HTTPS back to GDB.
debuginfod store the debug information it downloads?
The debug symbols downloaded from the service are saved inside
$XDG_CACHE_HOME is empty, then
~/.cache/ is used instead.
Can I remove files from the cache directory?
Yes, you can.
debuginfod will simply download them again if and when needed.
ddebs packages co-exist with
Yes. GDB will try to use local debug information if available. That means that if you have a
ddeb package installed that provides the necessary debug symbols for the program being debugged (or if you have already downloaded that information from the
debuginfod service earlier), then GDB will use it in favour of performing the download.
Can I use
debuginfod with my own binary that links against system libraries?
debuginfod will obviously not be able to provide any debug symbols for your own program, but it will happily serve debug information for any system libraries that your program links against.