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[perl #70748] threads panic in del_backref
[perl5.git] / t / op / threads.t
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1#!perl
2
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3BEGIN {
4 chdir 't' if -d 't';
996dc718 5 @INC = '../lib';
9708a845 6 require './test.pl';
57690963 7 $| = 1;
f935b2f6 8
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9 require Config;
10 if (!$Config::Config{useithreads}) {
11 print "1..0 # Skip: no ithreads\n";
12 exit 0;
f935b2f6 13 }
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14 if ($ENV{PERL_CORE_MINITEST}) {
15 print "1..0 # Skip: no dynamic loading on miniperl, no threads\n";
16 exit 0;
f935b2f6 17 }
09576c7d 18
27bca322 19 plan(17);
f935b2f6 20}
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21
22use strict;
23use warnings;
6765206c 24use threads;
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25
26# test that we don't get:
27# Attempt to free unreferenced scalar: SV 0x40173f3c
28fresh_perl_is(<<'EOI', 'ok', { }, 'delete() under threads');
29use threads;
878090d5 30threads->create(sub { my %h=(1,2); delete $h{1}})->join for 1..2;
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31print "ok";
32EOI
33
34#PR24660
35# test that we don't get:
36# Attempt to free unreferenced scalar: SV 0x814e0dc.
37fresh_perl_is(<<'EOI', 'ok', { }, 'weaken ref under threads');
38use threads;
39use Scalar::Util;
40my $data = "a";
41my $obj = \$data;
42my $copy = $obj;
43Scalar::Util::weaken($copy);
878090d5 44threads->create(sub { 1 })->join for (1..1);
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45print "ok";
46EOI
47
48#PR24663
49# test that we don't get:
50# panic: magic_killbackrefs.
51# Scalars leaked: 3
52fresh_perl_is(<<'EOI', 'ok', { }, 'weaken ref #2 under threads');
53package Foo;
54sub new { bless {},shift }
55package main;
56use threads;
57use Scalar::Util qw(weaken);
58my $object = Foo->new;
59my $ref = $object;
60weaken $ref;
878090d5 61threads->create(sub { $ref = $object } )->join; # $ref = $object causes problems
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62print "ok";
63EOI
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64
65#PR30333 - sort() crash with threads
66sub mycmp { length($b) <=> length($a) }
67
68sub do_sort_one_thread {
69 my $kid = shift;
70 print "# kid $kid before sort\n";
71 my @list = ( 'x', 'yy', 'zzz', 'a', 'bb', 'ccc', 'aaaaa', 'z',
72 'hello', 's', 'thisisalongname', '1', '2', '3',
73 'abc', 'xyz', '1234567890', 'm', 'n', 'p' );
74
75 for my $j (1..99999) {
76 for my $k (sort mycmp @list) {}
77 }
78 print "# kid $kid after sort, sleeping 1\n";
79 sleep(1);
80 print "# kid $kid exit\n";
81}
82
83sub do_sort_threads {
84 my $nthreads = shift;
85 my @kids = ();
86 for my $i (1..$nthreads) {
878090d5 87 my $t = threads->create(\&do_sort_one_thread, $i);
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88 print "# parent $$: continue\n";
89 push(@kids, $t);
90 }
91 for my $t (@kids) {
92 print "# parent $$: waiting for join\n";
93 $t->join();
94 print "# parent $$: thread exited\n";
95 }
96}
97
98do_sort_threads(2); # crashes
99ok(1);
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100
101# Change 24643 made the mistake of assuming that CvCONST can only be true on
102# XSUBs. Somehow it can also end up on perl subs.
103fresh_perl_is(<<'EOI', 'ok', { }, 'cloning constant subs');
104use constant x=>1;
105use threads;
106$SIG{__WARN__} = sub{};
107async sub {};
108print "ok";
109EOI
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110
111# From a test case by Tim Bunce in
112# http://www.nntp.perl.org/group/perl.perl5.porters/63123
113fresh_perl_is(<<'EOI', 'ok', { }, 'Ensure PL_linestr can be cloned');
114use threads;
e81465be 115print do 'op/threads_create.pl' || die $@;
db4997f0 116EOI
9708a845 117
9708a845 118
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119TODO: {
120 no strict 'vars'; # Accessing $TODO from test.pl
121 local $TODO = 'refcount issues with threads';
122
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123# Scalars leaked: 1
124foreach my $BLOCK (qw(CHECK INIT)) {
125 fresh_perl_is(<<EOI, 'ok', { }, "threads in $BLOCK block");
126 use threads;
127 $BLOCK { threads->create(sub {})->join; }
128 print 'ok';
129EOI
130}
131
132# Scalars leaked: 1
133fresh_perl_is(<<'EOI', 'ok', { }, 'Bug #41138');
134 use threads;
135 leak($x);
136 sub leak
137 {
138 local $x;
139 threads->create(sub {})->join();
140 }
141 print 'ok';
142EOI
143
144} # TODO
145
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146# [perl #45053] Memory corruption with heavy module loading in threads
147#
148# run-time usage of newCONSTSUB (as done by the IO boot code) wasn't
149# thread-safe - got occasional coredumps or malloc corruption
150{
76eabe0a 151 local $SIG{__WARN__} = sub {}; # Ignore any thread creation failure warnings
f0d3b40c 152 my @t;
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153 for (1..100) {
154 my $thr = threads->create( sub { require IO });
155 last if !defined($thr); # Probably ran out of memory
156 push(@t, $thr);
157 }
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158 $_->join for @t;
159 ok(1, '[perl #45053]');
160}
161
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162sub matchit {
163 is (ref $_[1], "Regexp");
164 like ($_[0], $_[1]);
165}
166
167threads->new(\&matchit, "Pie", qr/pie/i)->join();
168
169# tests in threads don't get counted, so
170curr_test(curr_test() + 2);
171
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172
173# the seen_evals field of a regexp was getting zeroed on clone, so
174# within a thread it didn't know that a regex object contrained a 'safe'
175# re_eval expression, so it later died with 'Eval-group not allowed' when
176# you tried to interpolate the object
177
178sub safe_re {
179 my $re = qr/(?{1})/; # this is literal, so safe
180 eval { "a" =~ /$re$re/ }; # interpolating safe values, so safe
181 ok($@ eq "", 'clone seen-evals');
182}
183threads->new(\&safe_re)->join();
184
185# tests in threads don't get counted, so
186curr_test(curr_test() + 1);
187
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188# This used to crash in 5.10.0 [perl #64954]
189
190undef *a;
191threads->new(sub {})->join;
192pass("undefing a typeglob doesn't cause a crash during cloning");
1db36481 193
7c76c2a0 194
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195# Test we don't get:
196# panic: del_backref during global destruction.
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197# when returning a non-closure sub from a thread and subsequently starting
198# a new thread.
199fresh_perl_is(<<'EOI', 'ok', { }, 'No del_backref panic [perl #70748]');
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200use threads;
201sub foo { return (sub { }); }
202my $bar = threads->create(\&foo)->join();
203threads->create(sub { })->join();
204print "ok";
205EOI
206
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207# Another, more reliable test for the same del_backref bug:
208fresh_perl_like(
209 <<' EOJ', qr/ok/, {}, 'No del_backref panic [perl #70748] (2)'
210 use threads;
211 push @bar, threads->create(sub{sub{}})->join() for 1...10;
212 print "ok";
213 EOJ
214);
215
216# Simple closure-returning test: At least this case works (though it
217# leaks), and we don't want to break it.
218fresh_perl_like(<<'EOJ', qr/^foo\n/, {}, 'returning a closure');
219use threads;
220print create threads sub {
221 my $x = "foo\n";
222 sub{sub{$x}}
223}=>->join->()()
224 //"undef"
225EOJ
7c76c2a0 226
9708a845 227# EOF