gdbserver/linux-low.cc: Ignore event_ptid if TARGET_WAITKIND_IGNORE

gdbserver's linux_process_target::wait loops if:

 - called in sync mode, and,
 - wait_1 returns TARGET_WAITKIND_IGNORE, _and_,
 - wait_1 also returns null_ptid.

The null_ptid check fails however when this path is taken:

   ptid_t
   linux_process_target::filter_exit_event (lwp_info *event_child,
					    target_waitstatus *ourstatus)
   {
   ...
     if (!is_leader (thread))
       {
	 if (report_exit_events_for (thread))
	   ourstatus->set_thread_exited (0);
	 else
	   ourstatus->set_ignore ();            <<<<<<<

	 delete_lwp (event_child);
       }
     return ptid;
   }

This makes linux_process_target::wait return TARGET_WAITKIND_IGNORE in
sync mode, which is unexpected by the core and fails an assertion.

This commit fixes it by just making linux_process_target::wait loop if
it got a TARGET_WAITKIND_IGNORE, irrespective of event_ptid.

Change-Id: I39776908a6c75cbd68aa04139ffcf7be334868cf

diff --git a/gdbserver/linux-low.cc b/gdbserver/linux-low.cc
index 7a4f8758ae96ce6f96f5837db433b2989f61d16a..ca2b7aa1e1be4b885518368105ed1011c526c4f0 100644 (file)
--- a/gdbserver/linux-low.cc
+++ b/gdbserver/linux-low.cc
@@ -3643,7 +3643,6 @@ linux_process_target::wait (ptid_t ptid,
       event_ptid = wait_1 (ptid, ourstatus, target_options);
     }
   while ((target_options & TARGET_WNOHANG) == 0
-        && event_ptid == null_ptid
         && ourstatus->kind () == TARGET_WAITKIND_IGNORE);
 
   /* If at least one stop was reported, there may be more.  A single