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[binutils-gdb] PR server/18081: gdbserver crashes when providing an unexisting binary
- From: Pedro Alves <palves at sourceware dot org>
- To: gdb-cvs at sourceware dot org
- Date: 6 May 2015 18:12:30 -0000
- Subject: [binutils-gdb] PR server/18081: gdbserver crashes when providing an unexisting binary
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=80ad801e90b5bd389ec156d37e28228fcbca128c
commit 80ad801e90b5bd389ec156d37e28228fcbca128c
Author: Pedro Alves <palves@redhat.com>
Date: Wed May 6 18:50:03 2015 +0100
PR server/18081: gdbserver crashes when providing an unexisting binary
$ ./gdbserver :1234 blah
Process blah created; pid = 16471
Cannot exec blah: No such file or directory.
Child exited with status 127
Killing process(es): 16471
../../../../src/binutils-gdb/gdb/gdbserver/linux-low.c:920: A problem internal to GDBserver has been detected.
kill_wait_lwp: Assertion `res > 0' failed.
GDBserver shouldn't even be trying to kill that process. GDBserver
kills or detaches from all processes on exit, and due to a missing
mourn_inferior call, GDBserver tries to kill the process that it had
already seen exit.
Tested on x86_64 Fedora 20. New test included. I emulated what
Windows outputs by hacking an error call in linux_create_inferior.
gdb/gdbserver/ChangeLog:
2015-05-06 Pedro Alves <palves@redhat.com>
PR server/18081
* server.c (start_inferior): If the process exits, mourn it.
gdb/testsuite/ChangeLog:
2015-05-06 Pedro Alves <palves@redhat.com>
PR server/18081
* gdb.server/non-existing-program.exp: New file.
Diff:
---
gdb/gdbserver/ChangeLog | 5 ++
gdb/gdbserver/server.c | 2 +
gdb/testsuite/ChangeLog | 5 ++
gdb/testsuite/gdb.server/non-existing-program.exp | 63 +++++++++++++++++++++++
4 files changed, 75 insertions(+)
diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog
index 10d01c1..c5312d0 100644
--- a/gdb/gdbserver/ChangeLog
+++ b/gdb/gdbserver/ChangeLog
@@ -1,3 +1,8 @@
+2015-05-06 Pedro Alves <palves@redhat.com>
+
+ PR server/18081
+ * server.c (start_inferior): If the process exits, mourn it.
+
2015-04-21 Gary Benson <gbenson@redhat.com>
* hostio.c (fileio_open_flags_to_host): Factored out to
diff --git a/gdb/gdbserver/server.c b/gdb/gdbserver/server.c
index d2e20d9..62287d4 100644
--- a/gdb/gdbserver/server.c
+++ b/gdb/gdbserver/server.c
@@ -284,6 +284,8 @@ start_inferior (char **argv)
current_thread->last_resume_kind = resume_stop;
current_thread->last_status = last_status;
}
+ else
+ mourn_inferior (find_process_pid (ptid_get_pid (last_ptid)));
return signal_pid;
}
diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 63c4bf3..a2bb3c9 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2015-05-06 Pedro Alves <palves@redhat.com>
+
+ PR server/18081
+ * gdb.server/non-existing-program.exp: New file.
+
2015-05-05 Joel Brobecker <brobecker@adacore.com>
* gdb.ada/out_of_line_in_inlined.exp: Add run and "bt" tests.
diff --git a/gdb/testsuite/gdb.server/non-existing-program.exp b/gdb/testsuite/gdb.server/non-existing-program.exp
new file mode 100644
index 0000000..f842c44
--- /dev/null
+++ b/gdb/testsuite/gdb.server/non-existing-program.exp
@@ -0,0 +1,63 @@
+# This testcase is part of GDB, the GNU debugger.
+
+# Copyright 2015 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/>.
+
+# Test starting gdbserver passing it the name of a non-existing
+# program.
+
+load_lib gdbserver-support.exp
+
+standard_testfile
+
+if { [skip_gdbserver_tests] } {
+ return 0
+}
+
+set gdbserver [find_gdbserver]
+if { $gdbserver == "" } {
+ fail "could not find gdbserver"
+ return
+}
+
+# Fire off gdbserver. The port doesn't really matter, gdbserver tries
+# to spawn the program before opening the connection.
+set spawn_id [remote_spawn target "$gdbserver stdio non-existing-program"]
+
+set msg "gdbserver exits cleanly"
+set saw_exiting 0
+expect {
+ # This is what we get on ptrace-based targets.
+ -re "stdin/stdout redirected.*No program to debug\r\nExiting\r\n$" {
+ set saw_exiting 1
+ exp_continue
+ }
+ # This is what we get on Windows.
+ -re "Error creating process\r\n\r\nExiting\r\n$" {
+ set saw_exiting 1
+ exp_continue
+ }
+ -re "A problem internal to GDBserver has been detected" {
+ fail "$msg (GDBserver internal error)"
+ wait
+ }
+ eof {
+ gdb_assert $saw_exiting $msg
+ wait
+ }
+ timeout {
+ fail "$msg (timeout)"
+ }
+}