gdbserver crash running gdb.threads/non-ldr-exc-1.exp

[deliverable/binutils-gdb.git] / gdb / gdbserver / server.c

diff --git a/gdb/gdbserver/server.c b/gdb/gdbserver/server.c
index 0105b994fb2b2262e4cc87886bdf60f3bc0ec917..9d65f6520d9f7582d5225b6d06700fa5efe5d961 100644 (file)
--- a/gdb/gdbserver/server.c
+++ b/gdb/gdbserver/server.c
@@ -1975,6 +1975,28 @@ handle_query (char *own_buf, int packet_len, int *new_packet_len_p)
 
   if (strcmp ("qSymbol::", own_buf) == 0)
     {
+      struct thread_info *save_thread = current_thread;
+
+      /* For qSymbol, GDB only changes the current thread if the
+        previous current thread was of a different process.  So if
+        the previous thread is gone, we need to pick another one of
+        the same process.  This can happen e.g., if we followed an
+        exec in a non-leader thread.  */
+      if (current_thread == NULL)
+       {
+         current_thread
+           = find_any_thread_of_pid (ptid_get_pid (general_thread));
+
+         /* Just in case, if we didn't find a thread, then bail out
+            instead of crashing.  */
+         if (current_thread == NULL)
+           {
+             write_enn (own_buf);
+             current_thread = save_thread;
+             return;
+           }
+       }
+
       /* GDB is suggesting new symbols have been loaded.  This may
         mean a new shared library has been detected as loaded, so
         take the opportunity to check if breakpoints we think are
@@ -1993,6 +2015,8 @@ handle_query (char *own_buf, int packet_len, int *new_packet_len_p)
       if (current_thread != NULL && the_target->look_up_symbols != NULL)
        (*the_target->look_up_symbols) ();
 
+      current_thread = save_thread;
+
       strcpy (own_buf, "OK");
       return;
     }