Seth, thank you kindly for your prompt and clear answer. I modified
server.c and confirm that gdb can now attach to the child process.
Although prctl(PR_SET_DUMPABLE, 1) has no effect (and returns 0!) when
called before resetting privileges, it works after the gid has been
reset to the debugging p
Public bug reported:
I cannot attach to a process with gdb despite setting ptrace_scope to 0.
The process has no capabilities, and is running under my uid & gid.
The process is a child, forked from a privileged program that has
divested itself of its parent's privileges. The parent is setgid and
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