Ticket #1767 (closed bug: fixed)

Opened 4 years ago

Last modified 4 years ago

join opcode causes segfaults and other memory corruption issues

Reported by: pmichaud Owned by:
Priority: critical Milestone:
Component: core Version: 2.6.0
Severity: high Keywords:
Cc: Language:
Patch status: Platform:

Description

The following PIR program produces a segfault on my system (r48766):

pmichaud@orange:~/parrot/trunk$ cat y.pir
.sub 'main' :main
    $P1 = new ['ResizablePMCArray']
    $I0 = 0
  loop:
    unless $I0 < 20000 goto done
    $P2 = new ['Integer']
    assign $P2, $I0
    push $P1, $P2
    inc $I0
    goto loop
  done:
    say 'about to join'
    $S0 = join ' ', $P1
    say $S0
.end

pmichaud@orange:~/parrot/trunk$ ./parrot y.pir
about to join
Segmentation fault
pmichaud@orange:~/parrot/trunk$ 

This problem has apparently existed since at least Parrot 2.6.0. Lowering the size of the array to 10,000 elements avoids the segfault, but in Rakudo even much smaller list sizes (200) can cause weird things to appear:

pmichaud@orange:~/rakudo$ ./perl6
> for 1..200 { $_ }
repr_P6opaque repr_P6opaque repr_P6opaque repr_P6opaque 
repr_P6opaque repr_P6opaque repr_P6opaque repr_P6opaque 
repr_P6opaque repr_P6opaque repr_P6opaque repr_P6opaque 
repr_P6opaque repr_P6opaque repr_P6opaque repr_P6opaque 
repr_P6opaque repr_P6opaque repr_P6opaque repr_P6opaque 
repr_P6opaque repr_P6opaque repr_P6opaque repr_P6opaque 
repr_P6opaque repr_P6opaque repr_P6opaque repr_P6opaque 
repr_P6opaque repr_P6opaque repr_P6opaque repr_P6opaque 
repr_P6opaque repr_P6opaque repr_P6opaque repr_P6opaque 
repr_P6opaque repr_P6opaque repr_P6opaque repr_P6opaque 
repr_P6opaque repr_P6opaque repr_P6opaque repr_P6opaque 
repr_P6opaque repr_P6opaque repr_P6opaque repr_P6opaque 
repr_P6opaque repr_P6opaque repr_P6opaque repr_P6opaque 
repr_P6opaque repr_P6opaque 55 56 57 58 59 60 61 62 63 64 65 66 67 
68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 
90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 
109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 
126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 
143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 
160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 
177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 
194 195 196 197 198 199 200
> 

Pm

Change History

Changed 4 years ago by bacek

  • status changed from new to closed
  • resolution set to fixed

Fixed in r48767. Test added in r48768. Thanks for report!

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