We have some testcases that build a C++ program (with -g), put systemtap probes into it, and in those probes, they call probefunc() to get the probe point's function name as a string.

If latest gcc-toolset-9-binutils is used, probefunc() fails to return the function names, but returns some pointers(?) instead.  If OTOH gcc-toolset-9-binutils rpm is removed, so that base rhel binutils gets used, the testcases pass.  This problem is x86_64 specific:  


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8.1 Server x86_64 #  scl enable gcc-toolset-9 bash
gcc-toolset-9   8.1 Server x86_64 #
gcc-toolset-9   8.1 Server x86_64 # g++ classes.cpp -g -o classes
gcc-toolset-9   8.1 Server x86_64 # stap -c ./classes tracker.stp |& head
StandaloneFunction start: 0x40112a
StandaloneFunction end: 0x401148
StandaloneFunction start: 0x401131
inner::StandaloneFunction start: 0x401131
StandaloneFunction end: 0x40114d
inner::StandaloneFunction end: 0x40114d
StandaloneFunction start: 0x401138
moreinner::StandaloneFunction start: 0x401138
StandaloneFunction end: 0x401152
moreinner::StandaloneFunction end: 0x401152
gcc-toolset-9   8.1 Server x86_64 # rpm -q gcc-toolset-9-binutils binutils
gcc-toolset-9-binutils-2.32-15.el8.x86_64
binutils-2.30-57.el8.x86_64
gcc-toolset-9   8.1 Server x86_64 # rpm -e gcc-toolset-9-binutils
gcc-toolset-9   8.1 Server x86_64 # 
gcc-toolset-9   8.1 Server x86_64 # g++ classes.cpp -g -o classes
gcc-toolset-9   8.1 Server x86_64 # stap -c ./classes tracker.stp |& head
StandaloneFunction start: _Z18StandaloneFunctionv
StandaloneFunction end: main
StandaloneFunction start: _ZN5inner18StandaloneFunctionEv
inner::StandaloneFunction start: _ZN5inner18StandaloneFunctionEv
StandaloneFunction end: main
inner::StandaloneFunction end: main
StandaloneFunction start: _ZN9moreinner18StandaloneFunctionEv
moreinner::StandaloneFunction start: _ZN9moreinner18StandaloneFunctionEv
StandaloneFunction end: main
moreinner::StandaloneFunction end: main
gcc-toolset-9   8.1 Server x86_64 # 
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One of the possible explanations is that this is a binutils regression, so I'll start with that.