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RFA: fix gdb_assert caused by 'catch signal ...' and fork
- From: Philippe Waroquiers <philippe dot waroquiers at skynet dot be>
- To: gdb-patches at sourceware dot org
- Date: Thu, 09 May 2013 23:56:22 +0200
- Subject: RFA: fix gdb_assert caused by 'catch signal ...' and fork
The attached patch fixes a gdb_assert caused by the combination of catch
signal and fork:
break-catch-sig.c:152: internal-error: signal_catchpoint_remove_location: Assertion `signal_catch_counts[iter] > 0' failed.
The problem is that the signal_catch_counts is decremented by detach_breakpoints.
The fix consists in not detaching breakpoint locations of type bp_loc_other.
The patch introduces a new test.
Ok to commit ?
Index: gdb/ChangeLog
===================================================================
RCS file: /cvs/src/src/gdb/ChangeLog,v
retrieving revision 1.15539
diff -u -p -r1.15539 ChangeLog
--- gdb/ChangeLog 9 May 2013 18:03:27 -0000 1.15539
+++ gdb/ChangeLog 9 May 2013 21:46:32 -0000
@@ -1,3 +1,8 @@
+2013-05-09 Philippe Waroquiers <philippe.waroquiers@skynet.be>
+
+ * breakpoints.c (detach_breakpoints): Do not
+ detach breakpoints locations with loc_type bp_loc_other.
+
2013-05-09 Doug Evans <dje@google.com>
* symfile.c (syms_from_objfile_1): Delete args offsets, num_offsets.
Index: gdb/breakpoint.c
===================================================================
RCS file: /cvs/src/src/gdb/breakpoint.c,v
retrieving revision 1.761
diff -u -p -r1.761 breakpoint.c
--- gdb/breakpoint.c 7 May 2013 17:04:28 -0000 1.761
+++ gdb/breakpoint.c 9 May 2013 21:46:33 -0000
@@ -3537,6 +3537,9 @@ detach_breakpoints (ptid_t ptid)
if (bl->pspace != inf->pspace)
continue;
+ if (bl->loc_type == bp_loc_other)
+ continue;
+
if (bl->inserted)
val |= remove_breakpoint_1 (bl, mark_inserted);
}
Index: gdb/testsuite/ChangeLog
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/ChangeLog,v
retrieving revision 1.3653
diff -u -p -r1.3653 ChangeLog
--- gdb/testsuite/ChangeLog 8 May 2013 18:56:02 -0000 1.3653
+++ gdb/testsuite/ChangeLog 9 May 2013 21:46:36 -0000
@@ -1,3 +1,8 @@
+2013-05-09 Philippe Waroquiers <philippe.waroquiers@skynet.be>
+
+ * gdb.base/catch-signal-fork.exp: New file.
+ * gdb.base/catch-signal-fork.c: New file.
+
2013-05-08 Tom Tromey <tromey@redhat.com>
* gdb.base/solib-search.exp: Set test name for "set
Index: gdb/testsuite/gdb.base/catch-signal-fork.c
===================================================================
RCS file: gdb/testsuite/gdb.base/catch-signal-fork.c
diff -N gdb/testsuite/gdb.base/catch-signal-fork.c
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ gdb/testsuite/gdb.base/catch-signal-fork.c 9 May 2013 21:46:36 -0000
@@ -0,0 +1,58 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+ Copyright 2013-2013 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/>. */
+#include <stdlib.h>
+#include <signal.h>
+#include <unistd.h>
+
+void
+do_nothing (void)
+{
+}
+
+void
+handle (int sig)
+{
+ do_nothing (); /* handle marker */
+}
+
+int
+main ()
+{
+ int i;
+ signal (SIGHUP, handle);
+
+ raise (SIGHUP); /* first HUP */
+
+ signal (SIGCHLD, handle);
+ for (i = 0; i < 3; i++) /* fork loop */
+ {
+ switch (fork())
+ {
+ case -1:
+ perror ("fork");
+ exit (1);
+ case 0:
+ exit (0);
+ }
+ (void) wait(NULL);
+ }
+
+ raise (SIGHUP); /* second HUP */
+
+ raise (SIGHUP); /* third HUP */
+}
+
Index: gdb/testsuite/gdb.base/catch-signal-fork.exp
===================================================================
RCS file: gdb/testsuite/gdb.base/catch-signal-fork.exp
diff -N gdb/testsuite/gdb.base/catch-signal-fork.exp
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ gdb/testsuite/gdb.base/catch-signal-fork.exp 9 May 2013 21:46:36 -0000
@@ -0,0 +1,43 @@
+# Copyright 2013-2013 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/>.
+
+if [target_info exists gdb,nosignals] {
+ verbose "Skipping catch-signal-fork.exp because of nosignals."
+ continue
+}
+
+standard_testfile
+
+if {[prepare_for_testing $testfile.exp $testfile $srcfile debug]} {
+ return -1
+}
+
+if {![runto_main]} {
+ return -1
+}
+
+# Test "catch signal SIGHUP"
+gdb_test "catch signal SIGHUP" "Catchpoint .*"
+gdb_breakpoint ${srcfile}:[gdb_get_line_number "first HUP"]
+gdb_breakpoint ${srcfile}:[gdb_get_line_number "fork loop"]
+
+gdb_continue_to_breakpoint "first HUP"
+gdb_test "continue" "Catchpoint .*"
+
+# Test interaction with fork.
+# This used to cause a gdb_assert in the code detaching the
+# breakpoints for the child.
+gdb_continue_to_breakpoint "fork loop"
+gdb_test "continue" "Catchpoint .* SIGHUP.*" "got SIGHUP after fork"