2012-07-20 Pedro Alves <palves@redhat.com>

	PR threads/11692
	PR gdb/12203

	gdb/
	* infrun.c (handle_inferior_event) <new thread>: Don't special
	case minus_one_ptid.
	<TARGET_WAITKIND_SPURIOUS>: Ditto.
	* linux-thread-db.c (thread_get_info_callback): Don't return early
	if the thread is zombie.
	(thread_from_lwp): Change return type to void.  Rewrite stale
	comment.
	(attach_thread): Don't return early if the thread is zombie,
	instead set its "dying" flag.
	(thread_db_wait): Don't return TARGET_WAITKIND_SPURIOUS anymore.
	(find_new_threads_callback): Don't return early if the thread is
	zombie.

	gdb/testsuite/
	* gdb.threads/create-fail.c: New file.
	* gdb.threads/create-fail.exp: New file.

1 files changed, 53 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.threads/create-fail.exp b/gdb/testsuite/gdb.threads/create-fail.exp
new file mode 100644
index 0000000..0cdacf6
--- /dev/null
+++ b/gdb/testsuite/gdb.threads/create-fail.exp
@@ -0,0 +1,53 @@
+# Copyright (C) 2012 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# On GNU/Linux, a creating a thread bound to an unexisting cpu spawns
+# the clone child thread for a bit, which is then immediately
+# cancelled.  The spawned child may trigger a dlopen (for libgcc_s)
+# while being cancelled, which results in a trap being reported to
+# GDB, for a thread that libthread_db considers to be TD_THR_ZOMBIE.
+# Make sure we handle that scenario properly.
+
+standard_testfile
+set executable ${testfile}
+
+if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
+    return -1
+}
+
+set iterations 10
+for {set i 1} {$i <= $iterations} {incr i} {
+    with_test_prefix "iteration $i" {
+
+	clean_restart ${executable}
+
+	if ![runto_main] {
+	    return -1
+	}
+
+	set test "run till end"
+	gdb_test_multiple "continue" "$test" {
+	    -re "exited with code 01.*$gdb_prompt $" {
+		pass "$test"
+	    }
+	    -re "exited with code 02.*$gdb_prompt $" {
+		unsupported "$test (too many CPUs for test?)"
+	    }
+	    -re "exited normally.*$gdb_prompt $" {
+		pass "$test"
+	    }
+	}
+    }
+}