[Bug gdb/27908] FAIL: gdb.base/run-attach-while-running.exp: threaded=1: run-or-attach=attach: non-stop=on: test: attach to process (timeout)

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

https://sourceware.org/bugzilla/show_bug.cgi?id=27908

--- Comment #7 from Tom de Vries <vries at gcc dot gnu.org> ---
Debugging setup using just an attach:
...
$ cat gdb.in
set non-stop on
set height 0
set width 0
set confirm off
$ cat ./exp.sh
#!/bin/sh

./outputs/gdb.base/run-attach-while-running/run-attach-while-running-threads &
pid=$!

cat gdb.in > gdb.cmd
echo attach $pid >> gdb.cmd
echo "info threads" >> gdb.cmd
./gdb -q -x gdb.cmd
...

Run exp.sh script and type info threads:
...
$ ./exp.sh
[New LWP 22236]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
0x00007f3ff816c4c0 in __GI___nanosleep
(requested_time=requested_time@entry=0x7ffeb63936c0,
remaining=remaining@entry=0x7ffeb63936c0) at
../sysdeps/unix/sysv/linux/nanosleep.c:27
27        return SYSCALL_CANCEL (nanosleep, requested_time, remaining);
  Id   Target Id                                           Frame 
* 1    Thread 0x7f3ff8bab740 (LWP 22234) "run-attach-whil" 0x00007f3ff816c4c0
in __GI___nanosleep (requested_time=requested_time@entry=0x7ffeb63936c0,
remaining=remaining@entry=0x7ffeb63936c0) at
../sysdeps/unix/sysv/linux/nanosleep.c:27
  2    Thread 0x7f3ff80a2700 (LWP 22236) "run-attach-whil" (running)
(gdb) 
Thread 2 "run-attach-whil" stopped.
0x00007f3ff816c4c0 in __GI___nanosleep
(requested_time=requested_time@entry=0x7f3ff80a1ea0,
remaining=remaining@entry=0x7f3ff80a1ea0) at
../sysdeps/unix/sysv/linux/nanosleep.c:27
27        return SYSCALL_CANCEL (nanosleep, requested_time, remaining);
info threads
  Id   Target Id                                           Frame 
* 1    Thread 0x7f3ff8bab740 (LWP 22234) "run-attach-whil" 0x00007f3ff816c4c0
in __GI___nanosleep (requested_time=requested_time@entry=0x7ffeb63936c0,
remaining=remaining@entry=0x7ffeb63936c0) at
../sysdeps/unix/sysv/linux/nanosleep.c:27
  2    Thread 0x7f3ff80a2700 (LWP 22236) "run-attach-whil" 0x00007f3ff816c4c0
in __GI___nanosleep (requested_time=requested_time@entry=0x7f3ff80a1ea0,
remaining=remaining@entry=0x7f3ff80a1ea0) at
../sysdeps/unix/sysv/linux/nanosleep.c:27
(gdb) 
...

We can see that thread 2 initially is still running, then the thread stopped
message arrives, and then info threads shows that the thread is no longer
running.

So why did it stop?

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