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67 lines
2.4 KiB
Plaintext
67 lines
2.4 KiB
Plaintext
# Copyright 2022-2023 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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# This test was introduced to reproduce a specific bug in GDBserver, where
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# attaching an inferior while another one was running would trigger a segfault
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# in GDBserver. Reproducing the bug required specific circumstances:
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#
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# - The first process must be far enough to have loaded its libc or
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# libpthread (whatever triggers the loading of libthread_db), such that
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# its proc->priv->thread_db is not nullptr
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#
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# - However, its lwp must still be in the `!lwp->thread_known` state,
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# meaning GDBserver hasn't asked libthread_db to compute the thread
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# handle yet. That means, GDB must not have refreshed the thread list
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# yet, since that would cause the thread handles to be computed. That
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# means, no stopping on a breakpoint, since that causes a thread list
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# update. That's why the first inferior needs to be started with "run
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# &".
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#
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# - Attaching the second process would segfault GDBserver.
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#
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# All of this to say, if modifying this test, please keep in mind the original
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# intent.
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standard_testfile
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require !use_gdb_stub
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if { [build_executable "failed to prepare" ${testfile} ${srcfile}] } {
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return
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}
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proc do_test {} {
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save_vars { $::GDBFLAGS } {
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append ::GDBFLAGS " -ex \"maint set target-non-stop on\""
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clean_restart $::binfile
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}
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gdb_test -no-prompt-anchor "run &"
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gdb_test "add-inferior" "Added inferior 2 on connection 1 .*"
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gdb_test "inferior 2" "Switching to inferior 2 .*"
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set spawn_id [spawn_wait_for_attach $::binfile]
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set pid [spawn_id_get_pid $spawn_id]
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# This call would crash GDBserver.
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gdb_attach $pid
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# Read a variable from the inferior, just to make sure the attach worked
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# fine.
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gdb_test "print global_var" " = 123"
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}
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do_test
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