http://sourceware.org/ml/gdb-patches/2014-09/msg00381.html
Subject: [testsuite patch] runaway attach processes  [Re: Regression: GDB stopped on run with attached process (PR 17347)]


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On Thu, 11 Sep 2014 14:35:53 +0200, Pedro Alves wrote:
> Thanks, pushed to both master and 7.8.

I have started seeing occasional runaway 'attach' processes these days.
I cannot be certain it is really caused by this patch, for example
grep 'FAIL.*cmdline attach run' does not show anything in my logs.

But as I remember this 'attach' runaway process always happened in GDB (but
I do not remember it in the past months) I think it would be most safe to just
solve it forever by [attached].


Jan

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gdb/testsuite/
2014-09-12  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* gdb.base/attach.c: Include unistd.h.
	(main): Call alarm.  Add label postloop.
	* gdb.base/attach.exp (do_attach_tests): Use gdb_get_line_number,
	gdb_breakpoint, gdb_continue_to_breakpoint.
	(test_command_line_attach_run): Kill ${testpid} in one exit path.


Amended for GDB 7.8.1 - Chris Horler

diff -Nur -x '*.orig' gdb-7.8.1.orig/gdb/testsuite/gdb.base/attach.c gdb-7.8.1/gdb/testsuite/gdb.base/attach.c
--- gdb-7.8.1.orig/gdb/testsuite/gdb.base/attach.c	2014-10-29 19:45:50.000000000 +0000
+++ gdb-7.8.1/gdb/testsuite/gdb.base/attach.c	2014-12-14 21:19:46.689476557 +0000
@@ -5,6 +5,7 @@
    exit unless/until gdb sets the variable to non-zero.)
    */
 #include <stdio.h>
+#include <unistd.h>
 
 int  should_exit = 0;
 
@@ -12,9 +13,11 @@
 {
   int  local_i = 0;
 
+  alarm (60);
+
   while (! should_exit)
     {
       local_i++;
     }
-  return 0;
+  return 0; /* postloop */
 }
diff -Nur -x '*.orig' gdb-7.8.1.orig/gdb/testsuite/gdb.base/attach.exp gdb-7.8.1/gdb/testsuite/gdb.base/attach.exp
--- gdb-7.8.1.orig/gdb/testsuite/gdb.base/attach.exp	2014-12-14 21:20:42.810658051 +0000
+++ gdb-7.8.1/gdb/testsuite/gdb.base/attach.exp	2014-12-14 21:22:53.479082555 +0000
@@ -287,11 +287,8 @@
 
     # Verify that the modification really happened.
 
-    gdb_test "tbreak 19" "Temporary breakpoint .*at.*$srcfile, line 19.*" \
-	"after attach2, set tbreak postloop"
-
-    gdb_test "continue" "main.*at.*$srcfile:19.*" \
-	"after attach2, reach tbreak postloop"
+    gdb_breakpoint [gdb_get_line_number "postloop"] temporary
+    gdb_continue_to_breakpoint "postloop" ".* postloop .*"
 
     # Allow the test process to exit, to cleanup after ourselves.
 
@@ -449,6 +446,7 @@
 		     "-iex \"set height 0\" -iex \"set width 0\" --pid=$testpid -ex \"start\""]
 	if { $res != 0} {
 	    fail $test
+	    remote_exec build "kill -9 ${testpid}"
 	    return $res
 	}
 	gdb_test_multiple "" $test {