To more directly illustrate:
$ gdb /usr/bin/ssh-agent $(pidof ssh-agent)
...
Attaching to program: /usr/bin/ssh-agent, process 16395
ptrace: Operation not permitted.
$ gdb /usr/bin/gpg-agent $(pidof gpg-agent)
...
Attaching to program: /usr/bin/gpg-agent, process 16396
...
0x00007f68d288af93 in __select_nocancel ()
at ../sysdeps/unix/syscall-template.S:82
82 ../sysdeps/unix/syscall-template.S: No such file or directory.
in ../sysdeps/unix/syscall-template.S
(gdb)
--
should be marked undumpable to avoid PTRACE attach
https://bugs.launchpad.net/bugs/572045
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