Bad magic number error about pprof

[rauls5382]

The symbolization code in pprof currently only supports ELF binaries (Linux).
It should be easy to update it to work on Mac OS. The main issue is examining the binary to identify any adjustments (if any) that need to be applied to stack addresses before passing them to a symbolization tool (eg addr2line or llvm-symbolize).

I do not have cycles to work on this on the immediate term, but patches are welcome.

[rauls5382]

This should be fixed, or at least improved at the current head. Please try it out and reopen if appropriate.

[marek-kuzora]

I'm hitting similar issue on OS X El Capitan 10.11.6:

Local symbolization failed for libsystem_kernel.dylib: unrecognized binary: /usr/lib/system/libsystem_kernel.dylib
Local symbolization failed for libc++.1.dylib: unrecognized binary: /usr/lib/libc++.1.dylib
Local symbolization failed for libsystem_pthread.dylib: unrecognized binary: /usr/lib/system/libsystem_pthread.dylib
Local symbolization failed for libsystem_platform.dylib: unrecognized binary: /usr/lib/system/libsystem_platform.dylib
Local symbolization failed for libsystem_malloc.dylib: unrecognized binary: /usr/lib/system/libsystem_malloc.dylib
Local symbolization failed for libdyld.dylib: unrecognized binary: /usr/lib/system/libdyld.dylib
Local symbolization failed for libsystem_c.dylib: unrecognized binary: /usr/lib/system/libsystem_c.dylib
Local symbolization failed for libsystem_m.dylib: unrecognized binary: /usr/lib/system/libsystem_m.dylib

After a quick change in pprof code I can see the error that's being thrown when trying to open by macho:

Local symbolization failed for libsystem_kernel.dylib: Parsing /usr/lib/system/libsystem_kernel.dylib: invalid magic number in record at byte 0x0
Local symbolization failed for libc++.1.dylib: Parsing /usr/lib/libc++.1.dylib: invalid magic number in record at byte 0x0
Local symbolization failed for libsystem_pthread.dylib: Parsing /usr/lib/system/libsystem_pthread.dylib: invalid magic number in record at byte 0x0
Local symbolization failed for libsystem_platform.dylib: Parsing /usr/lib/system/libsystem_platform.dylib: invalid magic number in record at byte 0x0
Local symbolization failed for libsystem_malloc.dylib: Parsing /usr/lib/system/libsystem_malloc.dylib: invalid magic number in record at byte 0x0
Local symbolization failed for libdyld.dylib: Parsing /usr/lib/system/libdyld.dylib: invalid magic number in record at byte 0x0
Local symbolization failed for libsystem_c.dylib: Parsing /usr/lib/system/libsystem_c.dylib: invalid magic number in record at byte 0x0
Local symbolization failed for libsystem_m.dylib: Parsing /usr/lib/system/libsystem_m.dylib: invalid magic number in record at byte 0x0

[singalen]

1. Reproduced on recent master of gperftools + Go pprof on C++ binary.
2. Can't get main executable's symbols in the profile either, both with -g or with -ggdb.