[Bug gdb/17347] New: Regression: GDB stopped on run with attached process

["jan.kratochvil at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17347

            Bug ID: 17347
           Summary: Regression: GDB stopped on run with attached process
           Product: gdb
           Version: 7.8
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: jan.kratochvil at redhat dot com
                CC: palves at redhat dot com
              Host: x86_64-linux-gnu
            Target: x86_64-linux-gnu

sleep 1h&p=$!;sleep 0.1;gdb -batch sleep $p -ex r

PASS:
[2] 22970
0x0000003fdf8bc780 in __nanosleep_nocancel () at
../sysdeps/unix/syscall-template.S:81
81      T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
/usr/bin/sleep: missing operand
Try '/usr/bin/sleep --help' for more information.
[Inferior 1 (process 23030) exited with code 01]
[2]+  Killed                  sleep 1h

FAIL:
[2]   Killed                  sleep 1h
[3]+  Stopped                 ./gdb/gdb -batch sleep $! -ex r

7180e04a36d812bbea2c280f2db33a7e8ce6b07b is the first bad commit
commit 7180e04a36d812bbea2c280f2db33a7e8ce6b07b
Author: Pedro Alves <palves@redhat.com>
Date:   Wed Jul 9 15:59:02 2014 +0100

    Fix "attach" command vs user input race

private Red Hat reference: https://bugzilla.redhat.com/show_bug.cgi?id=1136704

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