* linux-nat.c (exit_lwp): Fix NULL pointer access.

	(linux_nat_handle_extended): New parameter STOPPING.
	(wait_lwp): Call it with STOPPING equals 1.
	(linux_nat_wait): Call it with STOPPING equals 0.

1 files changed, 17 insertions, 9 deletions

diff --git a/gdb/linux-nat.c b/gdb/linux-nat.c
index 3cee912250f..5a80311808d 100644
--- a/gdb/linux-nat.c
+++ b/gdb/linux-nat.c
@@ -900,10 +900,13 @@ exit_lwp (struct lwp_info *lp)
       struct thread_info *thr;
 
       thr = iterate_over_threads (find_thread_from_lwp, &lp->ptid);
-      if (thr && !ptid_equal (thr->ptid, inferior_ptid))
-	delete_thread (thr->ptid);
-      else
-	record_dead_thread (thr->ptid);
+      if (thr)
+	{
+	  if (!ptid_equal (thr->ptid, inferior_ptid))
+	    delete_thread (thr->ptid);
+	  else
+	    record_dead_thread (thr->ptid);
+	}
     }
 
   delete_lwp (lp->ptid);
@@ -1279,10 +1282,11 @@ kill_lwp (int lwpid, int signo)
    just pass off to linux_handle_extended_wait, but if it reports a
    clone event we need to add the new LWP to our list (and not report
    the trap to higher layers).  This function returns non-zero if
-   the event should be ignored and we should wait again.  */
+   the event should be ignored and we should wait again.  If STOPPING
+   is true, the new LWP remains stopped, otherwise it is continued.  */
 
 static int
-linux_nat_handle_extended (struct lwp_info *lp, int status)
+linux_nat_handle_extended (struct lwp_info *lp, int status, int stopping)
 {
   linux_handle_extended_wait (GET_LWP (lp->ptid), status,
 			      &lp->waitstatus);
@@ -1294,7 +1298,11 @@ linux_nat_handle_extended (struct lwp_info *lp, int status)
       new_lp = add_lwp (BUILD_LWP (lp->waitstatus.value.related_pid,
 				   GET_PID (inferior_ptid)));
       new_lp->cloned = 1;
-      new_lp->stopped = 1;
+
+      if (stopping)
+	new_lp->stopped = 1;
+      else
+	ptrace (PTRACE_CONT, lp->waitstatus.value.related_pid, 0, 0);
 
       lp->waitstatus.kind = TARGET_WAITKIND_IGNORE;
 
@@ -1378,7 +1386,7 @@ wait_lwp (struct lwp_info *lp)
 	fprintf_unfiltered (gdb_stdlog,
 			    "WL: Handling extended status 0x%06x\n",
 			    status);
-      if (linux_nat_handle_extended (lp, status))
+      if (linux_nat_handle_extended (lp, status, 1))
 	return wait_lwp (lp);
     }
 
@@ -2023,7 +2031,7 @@ retry:
 		fprintf_unfiltered (gdb_stdlog,
 				    "LLW: Handling extended status 0x%06x\n",
 				    status);
-	      if (linux_nat_handle_extended (lp, status))
+	      if (linux_nat_handle_extended (lp, status, 0))
 		{
 		  status = 0;
 		  continue;