GDB kills itself instead of interrupting inferior
When GDB is run with IO redirected to a pipe, the 'interrupt' command causes it to kill its own process group instead of the inferior's. The problem manifests itself in async mode, native debugging: $ cat | gdb <file> (gdb) set target-async on (gdb) run & (gdb) interrupt A debugging session is active. Inferior 1 [process 20584] will be killed. Quit anyway? (y or n) [answered Y; input not from terminal] In this case, GDB tells that its stdin isn't a tty and doesn't save the inferior's process group in inflow.c:terminal_init_inferior_with_pgrp. The 'interrupt' command tries to 'kill' the inferior's process group in `inf-ptrace.c:inf_ptrace_stop`, but since that wasn't saved in the first place, GDB kills process group 0, meaning, its own process group. When GDB is used from a frontend, that means killing its own process group including the frontend and possibly the X session. This was originally seen with SublimeGDB: https://github.com/quarnster/SublimeGDB/issues/29. The patch makes GDB save the inferior pgid regardless of having a terminal, as pgid is used not only to reset foreground process group, but also to interrupt the inferior process. It also adds a regression test. Luckily, we can emulate not having a terminal with "set interactive-mode off", avoiding the need of special magic to spawn gdb with a pipe. Tested on x86_64 Fedora 17. gdb/ 2013-07-26 Cyril Nikolaev <cyril@nichtverstehen.de> * inflow.c (terminal_init_inferior_with_pgrp): Save inferior process group regardless of having tty on stdin. gdb/testsuite/ 2013-07-26 Pedro Alves <palves@redhat.com> * gdb.base/interrupt-noterm.c, gdb.base/interrupt-noterm.exp: New files.
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parent
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@ -1,3 +1,8 @@
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2013-07-26 Cyril Nikolaev <cyril@nichtverstehen.de>
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* inflow.c (terminal_init_inferior_with_pgrp): Save inferior
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process group regardless of having tty on stdin.
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2013-07-25 Doug Evans <dje@google.com>
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* linux-fork.h (detach_fork): Delete.
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17
gdb/inflow.c
17
gdb/inflow.c
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@ -217,19 +217,22 @@ static void terminal_ours_1 (int);
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void
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terminal_init_inferior_with_pgrp (int pgrp)
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{
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struct inferior *inf = current_inferior ();
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struct terminal_info *tinfo = get_inflow_inferior_data (inf);
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#ifdef PROCESS_GROUP_TYPE
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/* Store the process group even without a terminal as it is used not
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only to reset the tty foreground process group, but also to
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interrupt the inferior. */
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tinfo->process_group = pgrp;
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#endif
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if (gdb_has_a_terminal ())
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{
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struct inferior *inf = current_inferior ();
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struct terminal_info *tinfo = get_inflow_inferior_data (inf);
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xfree (tinfo->ttystate);
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tinfo->ttystate = serial_copy_tty_state (stdin_serial,
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our_terminal_info.ttystate);
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#ifdef PROCESS_GROUP_TYPE
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tinfo->process_group = pgrp;
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#endif
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/* Make sure that next time we call terminal_inferior (which will be
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before the program runs, as it needs to be), we install the new
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process group. */
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2013-07-26 Pedro Alves <palves@redhat.com>
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* gdb.base/interrupt-noterm.c, gdb.base/interrupt-noterm.exp: New
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files.
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2013-07-25 Andrew Burgess <aburgess@broadcom.com>
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* gdb.mi/mi-reg-undefined.exp: New file.
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/* This testcase is part of GDB, the GNU debugger.
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Copyright (C) 2013 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <unistd.h>
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int
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main ()
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{
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sleep (3);
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return 0;
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}
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# Copyright (C) 2013 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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standard_testfile
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if [prepare_for_testing "failed to prepare for testing" \
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${testfile} ${srcfile} {debug}] {
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return -1
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}
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# Pretend there's no terminal.
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gdb_test_no_output "set interactive-mode off"
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gdb_test_no_output "set target-async on"
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if ![runto main] {
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fail "Can't run to main"
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return -1
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}
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# Delete breakpoints so that the next resume is a plain continue,
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# instead of a step-over-breakpoint sequence just while GDB sends the
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# interrupt request. If that's buggy on some targets (and it was on
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# target remote for a while, where a ctrl-c at the wrong time will get
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# lost), then it should get its own specific test. Disable
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# confirmation, avoiding complications caused by the fact that we've
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# disabled the terminal -- GDB would auto-answer "yes", confusing
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# gdb_test_multiple.
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gdb_test_no_output "set confirm off"
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gdb_test_no_output "delete"
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gdb_test_no_output "set confirm on"
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set async_supported -1
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set test "continue &"
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gdb_test_multiple $test $test {
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-re "Continuing\\.\r\n$gdb_prompt $" {
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set async_supported 1
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pass $test
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}
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-re ".*Asynchronous execution not supported on this target..*" {
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unsupported $test
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}
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}
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if { $async_supported < 0 } {
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return 1
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}
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# With native debugging, and no terminal (emulated by interactive-mode
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# off, above), GDB had a bug where "interrupt" would send SIGINT to
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# its own process group, instead of the inferior's.
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set test "interrupt"
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gdb_test_multiple $test $test {
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-re "interrupt\r\n$gdb_prompt " {
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pass $test
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}
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}
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set test "inferior received SIGINT"
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gdb_test_multiple "" $test {
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-re "\r\nProgram received signal SIGINT.*" {
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# This appears after the prompt, which was already consumed
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# above.
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pass $test
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}
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}
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