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

   1 # Copyright (C) 2015 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 standard_testfile
  24
  25 proc do_test { detach_on_fork } {
  26     global GDBFLAGS
  27     global srcfile testfile
  28     global gdb_prompt
  29
  30     set saved_gdbflags $GDBFLAGS
  31     set GDBFLAGS [concat $GDBFLAGS " -ex \"set non-stop on\""]
  32
  33     if {[prepare_for_testing "failed to prepare" \
  34              $testfile $srcfile {debug pthreads}] == -1} {
  35         set GDBFLAGS $saved_gdbflags
  36         return -1
  37     }
  38
  39     set GDBFLAGS $saved_gdbflags
  40
  41     if ![runto_main] then {
  42         fail "Can't run to main"
  43         return 0
  44     }
  45
  46     gdb_test_no_output "set detach-on-fork $detach_on_fork"
  47     set test "continue &"
  48     gdb_test_multiple $test $test {
  49         -re "$gdb_prompt " {
  50             pass $test
  51         }
  52     }
  53
  54     # gdbserver had a bug that resulted in reporting the fork child's
  55     # initial stop to gdb, which gdb does not expect, in turn
  56     # resulting in a broken session, like:
  57     #
  58     #  [Thread 31536.31536] #16 stopped.                                <== BAD
  59     #  [New Thread 31547.31547]
  60     #  [Inferior 10 (process 31536) exited normally]
  61     #  [New Thread 31547.31560]
  62     #
  63     #  [Thread 31547.31547] #18 stopped.                                <== BAD
  64     #  Cannot remove breakpoints because program is no longer writable. <== BAD
  65     #  Further execution is probably impossible.                        <== BAD
  66     #  [Inferior 11 (process 31547) exited normally]
  67     #  [Inferior 1 (process 31454) exited normally]
  68     #
  69     # These variables track whether we see such broken behavior.
  70     set saw_cannot_remove_breakpoints 0
  71     set saw_thread_stopped 0
  72
  73     set test "inferior 1 exited"
  74     gdb_test_multiple "" $test {
  75         -re "Cannot remove breakpoints" {
  76             set saw_cannot_remove_breakpoints 1
  77             exp_continue
  78         }
  79         -re "Thread \[^\r\n\]+ stopped\\." {
  80             set saw_thread_stopped 1
  81             exp_continue
  82         }
  83         -re "Inferior 1 \(\[^\r\n\]+\) exited normally" {
  84             pass $test
  85         }
  86     }
  87
  88     gdb_assert !$saw_cannot_remove_breakpoints \
  89         "no failure to remove breakpoints"
  90     gdb_assert !$saw_thread_stopped \
  91         "no spurious thread stop"
  92
  93     gdb_test "info threads" "No threads\." \
  94         "no threads left"
  95
  96     gdb_test "info inferiors" \
  97         "Num\[ \t\]+Description\[ \t\]+Executable\[ \t\]+\r\n\\* 1 \[^\r\n\]+" \
  98         "only inferior 1 left"
  99 }
 100
 101 foreach detach_on_fork {"on" "off"} {
 102     with_test_prefix "detach-on-fork=$detach_on_fork" {
 103         do_test $detach_on_fork
 104     }
 105 }