gdb/testsuite/gdb.threads/fork-plus-threads.exp

   1 # Copyright (C) 2015-2020 Free Software Foundation, Inc.
   2
   3 # This program is free software; you can redistribute it and/or modify
   4 # it under the terms of the GNU General Public License as published by
   5 # the Free Software Foundation; either version 3 of the License, or
   6 # (at your option) any later version.
   7 #
   8 # This program is distributed in the hope that it will be useful,
   9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 # GNU General Public License for more details.
  12 #
  13 # You should have received a copy of the GNU General Public License
  14 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15
  16 # This test verifies that threads created by the child fork are
  17 # properly handled.  Specifically, GDB used to have a bug where it
  18 # would leave child fork threads stuck stopped, even though "info
  19 # threads" would show them running.
  20 #
  21 # See https://sourceware.org/bugzilla/show_bug.cgi?id=18600
  22
  23 # In remote mode, we cannot continue debugging after all
  24 # inferiors have terminated, and this test requires that.
  25 if { [target_info exists gdb_protocol]
  26      && [target_info gdb_protocol] == "remote" } {
  27     continue
  28 }
  29
  30 standard_testfile
  31
  32 proc do_test { detach_on_fork } {
  33     global GDBFLAGS
  34     global srcfile testfile
  35     global gdb_prompt
  36
  37     set saved_gdbflags $GDBFLAGS
  38     set GDBFLAGS [concat $GDBFLAGS " -ex \"set non-stop on\""]
  39
  40     if {[prepare_for_testing "failed to prepare" \
  41              $testfile $srcfile {debug pthreads}] == -1} {
  42         set GDBFLAGS $saved_gdbflags
  43         return -1
  44     }
  45
  46     set GDBFLAGS $saved_gdbflags
  47
  48     if ![runto_main] then {
  49         fail "can't run to main"
  50         return 0
  51     }
  52
  53     gdb_test_no_output "set detach-on-fork $detach_on_fork"
  54     set test "continue &"
  55     gdb_test_multiple $test $test {
  56         -re "$gdb_prompt " {
  57             pass $test
  58         }
  59     }
  60
  61     # gdbserver had a bug that resulted in reporting the fork child's
  62     # initial stop to gdb, which gdb does not expect, in turn
  63     # resulting in a broken session, like:
  64     #
  65     #  [Thread 31536.31536] #16 stopped.                                <== BAD
  66     #  [New Thread 31547.31547]
  67     #  [Inferior 10 (process 31536) exited normally]
  68     #  [New Thread 31547.31560]
  69     #
  70     #  [Thread 31547.31547] #18 stopped.                                <== BAD
  71     #  Cannot remove breakpoints because program is no longer writable. <== BAD
  72     #  Further execution is probably impossible.                        <== BAD
  73     #  [Inferior 11 (process 31547) exited normally]
  74     #  [Inferior 1 (process 31454) exited normally]
  75     #
  76     # These variables track whether we see such broken behavior.
  77     set saw_cannot_remove_breakpoints 0
  78     set saw_thread_stopped 0
  79
  80     set test "inferior 1 exited"
  81     gdb_test_multiple "" $test {
  82         -re "Cannot remove breakpoints" {
  83             set saw_cannot_remove_breakpoints 1
  84             exp_continue
  85         }
  86         -re "Thread \[^\r\n\]+ stopped\\." {
  87             set saw_thread_stopped 1
  88             exp_continue
  89         }
  90         -re "Thread \[^\r\n\]+ exited" {
  91             # Avoid timeout with check-read1
  92             exp_continue
  93         }
  94         -re "New Thread \[^\r\n\]+" {
  95             # Avoid timeout with check-read1
  96             exp_continue
  97         }
  98         -re "Inferior 1 \(\[^\r\n\]+\) exited normally" {
  99             pass $test
 100         }
 101     }
 102
 103     gdb_assert !$saw_cannot_remove_breakpoints \
 104         "no failure to remove breakpoints"
 105     gdb_assert !$saw_thread_stopped \
 106         "no spurious thread stop"
 107
 108     gdb_test "info threads" "No threads\." \
 109         "no threads left"
 110
 111     gdb_test "info inferiors" \
 112         "Num\[ \t\]+Description\[ \t\]+Connection\[ \t\]+Executable\[ \t\]+\r\n\\* 1 \[^\r\n\]+" \
 113         "only inferior 1 left"
 114 }
 115
 116 foreach detach_on_fork {"on" "off"} {
 117     with_test_prefix "detach-on-fork=$detach_on_fork" {
 118         do_test $detach_on_fork
 119     }
 120 }