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The patch at
<https://sourceware.org/ml/gdb-patches/2017-11/msg00039.html> was
proposing to add an assertion to child_terminal_init that turns out
would fail if you tried to attach to a process that isn't a process
group leader.
Since the testsuite failed to catch the problem, this commit adds a
new testcase that would catch it, like:
(gdb) attach 12415
Attaching to program: build/gdb/testsuite/outputs/gdb.base/attach-non-pgrp-leader/attach-non-pgrp-leader, process 12415
src/gdb/inflow.c:180: internal-error: void child_terminal_init(target_ops*): Assertion `getpgid (inf->pid) == inf->pid' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) FAIL: gdb.base/attach-non-pgrp-leader.exp: child: attach to child (GDB internal error)
gdb/testsuite/ChangeLog:
2017-11-06 Pedro Alves <palves@redhat.com>
* gdb.base/attach-non-pgrp-leader.c: New.
* gdb.base/attach-non-pgrp-leader.exp: New.
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