[Bug gdb/15316] New: GNU/Linux x86_64, fails to switch inferior processes with error "Inferior has no threads" after child process exits

[Bug gdb/15316] New: GNU/Linux x86_64, fails to switch inferior processes with error "Inferior has no threads" after child process exits

[jjgionta at ncsu dot edu]

http://sourceware.org/bugzilla/show_bug.cgi?id=15316

             Bug #: 15316
           Summary: GNU/Linux x86_64, fails to switch inferior processes
                    with error "Inferior has no threads" after child
                    process exits
           Product: gdb
           Version: 7.4
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
        AssignedTo: unassigned@sourceware.org
        ReportedBy: jjgionta@ncsu.edu
    Classification: Unclassified


Created attachment 6952
  --> http://sourceware.org/bugzilla/attachment.cgi?id=6952
output of gdb with bug behavior. Cannot switch to inferior 1.

Debugging a process with detach-on-fork off and follow-fork-mode child. The
parent forks and waits on the child pid. After the child exits, gdb cannot
successfully switch to the parent that is waiting on the exited child. Inferior
1 returns "Inferior has no threads" however the process is still running
waiting on the child to exit.

This bug is essentially the same as a previously closed bug
http://sourceware.org/bugzilla/show_bug.cgi?id=9585 

attached is the gdb trace with:
handle SIGUSR2 noprint
set follow-fork-mode child
set detach-on-fork off
set schedule-multiple on
set debug infrun 1
set debug lin-lwp 1

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