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91 lines
2.8 KiB
Plaintext
91 lines
2.8 KiB
Plaintext
# This testcase is part of GDB, the GNU debugger.
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#
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# Copyright 2013-2020 Free Software Foundation, Inc.
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#
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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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# Regression test for a bug that would go like this:
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#
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# - Run to a breakpoint that is hit by two threads (A and B)
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# simultaneously.
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#
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# - One of the breakpoint hits is processed (e.g., thread A) and
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# causes a user-visible stop. The other (thread B) is left pending.
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#
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# - The user deletes the breakpoint with "del", which causes a
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# confirmation query.
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#
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# - By mistake, that would result in the target being left with async
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# enabled, even though it wasn't to begin with.
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#
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# - GDB reacts to target async enablement by polling for target
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# events. As no thread is resumed the target replies
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# TARGET_WAITKIND_NO_RESUMED.
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#
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# - The user continues the program, expecting it to exit. The thread
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# that has an event pending (thread B) is not really resumed.
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#
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# - But, nothing signals the event loop that there's a pending event
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# waiting to be collected for thread B, so that event is never
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# processed, thread B is never resumed and the program never exits.
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#
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# Ref: https://sourceware.org/ml/gdb-patches/2015-01/msg00592.html
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standard_testfile
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if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug pthreads}] == -1} {
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return -1
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}
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proc test {} {
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global srcfile gdb_prompt
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if ![runto_main] {
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return -1
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}
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delete_breakpoints
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set bp_line [gdb_get_line_number "set break here" $srcfile]
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gdb_breakpoint "break_function"
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gdb_continue_to_breakpoint "cont to break_function" ".*$srcfile:$bp_line\r\n.*"
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# Do something that causes a query/secondary prompt.
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set test "delete breakpoints, answer prompt"
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set saw_prompt 0
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gdb_test_multiple "delete breakpoints" $test {
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-re "Delete all breakpoints.*y or n.*$" {
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set saw_prompt 1
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send_gdb "y\n"
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exp_continue
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}
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-re "$gdb_prompt $" {
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gdb_assert $saw_prompt $test
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}
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}
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gdb_continue_to_end "" "continue" 1
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}
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# Test a few times to make sure an event is left pending. At the time
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# of writing, the bug always triggers, but that might naturally depend
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# on machine.
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for {set i 1} {$i <= 10} {incr i} {
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with_test_prefix "iter $i" {
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test
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}
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}
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