[Bug gdb/31203] [gdb] FAIL: gdb.base/kill-during-detach.exp: exit_p=true: checkpoint_p=true: python kill_and_detach()

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31203

--- Comment #8 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Kevin Buettner from comment #7)
> Thus far, I haven't been able to reproduce it.

I started from a clean os install, built and tested gdb, and then used grepping
UNTESTED/UNSUPPORTED to add packages and configure settings to make the build
more complete.  At some point in this process I started running into this
failure.  So I decided to revert this process, but didn't manage, a very
minimal gdb still reproduced the failure 100% of the time.

I also did some updates at some point, so I was in the 'need restart' state. 
After restarting, the failure disappeared.

I investigated the file descriptor list in /proc/<pid>/fd, and found two
sockets where I previously found the files mentioned in comment 6.

Anyway, I wrote a patch for the test-case that allows us reproduce the failure
reliably, also on x86-64-linux.

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