https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219153

--- Comment #5 from John Baldwin <j...@freebsd.org> ---
I would start with trying to debug why 'ps -M' doesn't work by stepping through
'ps'.

In terms of gdb7 vs gdb6, I definitely used gdb7 on userland binaries with
threads, fork following, etc. last year under qemu for ppc64.  The gdb port has
a DEBUG option that will build gdb with debug symbols.  Can you build your gdb
port with that (if not already enabled) and get a stack trace from the
gdb.core?  You can use /usr/libexec/gdb to examine the core of gdb7 for now. 
Alternatively, you can grab the a.out and core file from a ppc system and debug
it using the gdb binary from ports on an amd64 host (the ports gdb includes
cross-debugging of user cores for all supported architectures).  It may be that
the amd64 gdb7 also cores, but if so you will be able to debug the amd64 gdb7
using a native gdb7 on amd64.

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