| # Copyright 2022-2024 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/>. |
| |
| # This test was introduced to reproduce a specific bug in GDBserver, where |
| # attaching an inferior while another one was running would trigger a segfault |
| # in GDBserver. Reproducing the bug required specific circumstances: |
| # |
| # - The first process must be far enough to have loaded its libc or |
| # libpthread (whatever triggers the loading of libthread_db), such that |
| # its proc->priv->thread_db is not nullptr |
| # |
| # - However, its lwp must still be in the `!lwp->thread_known` state, |
| # meaning GDBserver hasn't asked libthread_db to compute the thread |
| # handle yet. That means, GDB must not have refreshed the thread list |
| # yet, since that would cause the thread handles to be computed. That |
| # means, no stopping on a breakpoint, since that causes a thread list |
| # update. That's why the first inferior needs to be started with "run |
| # &". |
| # |
| # - Attaching the second process would segfault GDBserver. |
| # |
| # All of this to say, if modifying this test, please keep in mind the original |
| # intent. |
| |
| standard_testfile |
| |
| require !use_gdb_stub |
| |
| if { [build_executable "failed to prepare" ${testfile} ${srcfile}] } { |
| return |
| } |
| |
| proc do_test {} { |
| save_vars { ::GDBFLAGS } { |
| append ::GDBFLAGS " -ex \"maint set target-non-stop on\"" |
| clean_restart $::binfile |
| } |
| |
| gdb_test -no-prompt-anchor "run &" |
| gdb_test "add-inferior" "Added inferior 2 on connection 1 .*" |
| gdb_test "inferior 2" "Switching to inferior 2 .*" |
| |
| set spawn_id [spawn_wait_for_attach $::binfile] |
| set pid [spawn_id_get_pid $spawn_id] |
| |
| # This call would crash GDBserver. |
| gdb_attach $pid |
| |
| # Read a variable from the inferior, just to make sure the attach worked |
| # fine. |
| gdb_test "print global_var" " = 123" |
| } |
| |
| do_test |