[Libunwind-devel] unw_get_proc_info is not signal-safe with debug-frames enabled

[Doug Moore]

It seems that unw_get_proc_info calls dwarf_make_proc_info, calls 
fetch_proc_info, calls dwarf_find_proc_info, calls dl_iterate_phdr, 
calls dwarf_callback, calls dwarf_find_debug_frame, calls calloc, and 
callloc is not signal safe on the aarch64 device I'm testing on.

So would there be a problem with replacing the calloc/realloc memory 
management of 'tab' in Gfind_proc_info-lsb.c with mmap and munmap and 
memcpy?

Is the memory allocated for 'tab' freed anywhere?  It's not obvious that 
it is.

Thanks,

Doug Moore

Rice University