segfault generating datamatrix barcode

[AndrewRayCode]

    barcode = Barby::DataMatrix.new(json)
    blob = Barby::PngOutputter.new(barcode)
    blob.xdim = 3
    blob.ydim = 3
    barcode_image = Tempfile.new(['barcode', '.png'])
    barcode_image.binmode
    barcode_image.write(blob.to_png) # segfault on this line
    barcode_image.close

Segfault start:

.rvm/gems/ruby-2.1.5@project/gems/barby-0.6.5/lib/barby/barcode/data_matrix.rb:24: [BUG] Segmentation fault at 0x0000000000001d
ruby 2.1.5p273 (2014-11-13 revision 48405) [x86_64-darwin16.0]

-- Control frame information -----------------------------------------------
c:0126 p:0039 s:0640 e:000638 METHOD .rvm/gems/ruby-2.1.5@project/gems/barby-0.6.5/lib/barby/barcode/data_matrix.rb:24
c:0125 p:0007 s:0636 e:000635 METHOD .rvm/gems/ruby-2.1.5@project/gems/barby-0.6.5/lib/barby/barcode/data_matrix.rb:29
c:0124 p:0041 s:0633 e:000632 METHOD .rvm/gems/ruby-2.1.5@project/gems/barby-0.6.5/lib/barby/outputter.rb:84
c:0123 p:0014 s:0629 e:000628 METHOD .rvm/gems/ruby-2.1.5@project/gems/barby-0.6.5/lib/barby/outputter/png_outputter.rb:105
c:0122 p:0007 s:0626 e:000625 METHOD .rvm/gems/ruby-2.1.5@project/gems/barby-0.6.5/lib/barby/outputter/png_outputter.rb:77
c:0121 p:0007 s:0623 e:000622 METHOD .rvm/gems/ruby-2.1.5@project/gems/barby-0.6.5/lib/barby/outputter/png_outputter.rb:85
c:0120 p:0016 s:0620 e:000618 BLOCK  .rvm/gems/ruby-2.1.5@project/gems/barby-0.6.5/lib/barby/outputter/png_outputter.rb:23
c:0119 p:0020 s:0614 e:000613 METHOD .rvm/gems/ruby-2.1.5@project/gems/barby-0.6.5/lib/barby/outputter.rb:122
c:0118 p:0013 s:0608 e:000607 METHOD .rvm/gems/ruby-2.1.5@project/gems/barby-0.6.5/lib/barby/outputter/png_outputter.rb:22
c:0117 p:0043 s:0604 e:000603 METHOD .rvm/gems/ruby-2.1.5@project/gems/barby-0.6.5/lib/barby/outputter/png_outputter.rb:66
c:0116 p:0009 s:0599 e:000598 METHOD .rvm/gems/ruby-2.1.5@project/gems/barby-0.6.5/lib/barby/outputter/png_outputter.rb:72
c:0114 p:---- s:0593 e:000592 CFUNC  :eval
c:0110 p:---- s:0570 e:000569 CFUNC  :catch
c:0108 p:---- s:0564 e:000563 CFUNC  :catch
c:0105 p:---- s:0550 e:000549 CFUNC  :loop
c:0102 p:---- s:0542 e:000541 CFUNC  :call
c:0094 p:---- s:0513 e:000512 CFUNC  :catch
c:0089 p:0083 s:0493 E:001eb0 METHOD dev/project/lib/barcode.rb:41
c:0088 p:0015 s:0485 E:0019d0 METHOD dev/project/lib/barcode.rb:19
c:0086 p:---- s:0472 e:000471 CFUNC  :new
c:0085 p:0016 s:0468 E:001ab0 METHOD dev/project/app/models/outbound_fax_pdf.rb:19
c:0084 p:0007 s:0464 E:001b28 METHOD dev/project/app/models/outbound_fax_pdf.rb:11
c:0082 p:---- s:0458 e:000457 CFUNC  :call
c:0080 p:---- s:0452 e:000451 CFUNC  :call
c:0077 p:---- s:0439 e:000438 CFUNC  :call
c:0071 p:---- s:0417 e:000416 CFUNC  :catch
c:0051 p:---- s:0303 e:000302 CFUNC  :each
c:0003 p:---- s:0008 e:000007 CFUNC  :call
c:0002 p:0042 s:0005 E:002090 BLOCK  .rvm/gems/ruby-2.1.5@project/gems/logging-2.2.2/lib/logging/diagnostic_context.rb:474 [FINISH]
c:0001 p:---- s:0002 e:000001 TOP    [FINISH]

.rvm/gems/ruby-2.1.5@project/gems/logging-2.2.2/lib/logging/diagnostic_context.rb:474:in `block in create_with_logging_context'
.rvm/gems/ruby-2.1.5@project/gems/logging-2.2.2/lib/logging/diagnostic_context.rb:474:in `call'
dev/project/app/models/outbound_fax_pdf.rb:19:in `new'
dev/project/lib/barcode.rb:41:in `generate_barcode_image'
.rvm/gems/ruby-2.1.5@project/gems/barby-0.6.5/lib/barby/outputter/png_outputter.rb:72:in `to_png'
.rvm/gems/ruby-2.1.5@project/gems/barby-0.6.5/lib/barby/outputter/png_outputter.rb:66:in `to_datastream'
.rvm/gems/ruby-2.1.5@project/gems/barby-0.6.5/lib/barby/outputter/png_outputter.rb:22:in `to_image'
.rvm/gems/ruby-2.1.5@project/gems/barby-0.6.5/lib/barby/outputter.rb:122:in `with_options'
.rvm/gems/ruby-2.1.5@project/gems/barby-0.6.5/lib/barby/outputter/png_outputter.rb:23:in `block in to_image'
.rvm/gems/ruby-2.1.5@project/gems/barby-0.6.5/lib/barby/outputter/png_outputter.rb:85:in `full_width'
.rvm/gems/ruby-2.1.5@project/gems/barby-0.6.5/lib/barby/outputter/png_outputter.rb:77:in `width'
.rvm/gems/ruby-2.1.5@project/gems/barby-0.6.5/lib/barby/outputter/png_outputter.rb:105:in `length'
.rvm/gems/ruby-2.1.5@project/gems/barby-0.6.5/lib/barby/outputter.rb:84:in `encoding'
.rvm/gems/ruby-2.1.5@project/gems/barby-0.6.5/lib/barby/barcode/data_matrix.rb:29:in `encoding'
.rvm/gems/ruby-2.1.5@project/gems/barby-0.6.5/lib/barby/barcode/data_matrix.rb:24:in `encoder'

-- C level backtrace information -------------------------------------------
0   libruby.2.1.0.dylib                 0x000000010e264096 rb_vm_bugreport + 134
1   libruby.2.1.0.dylib                 0x000000010e1194a4 report_bug + 292
2   libruby.2.1.0.dylib                 0x000000010e119373 rb_bug + 179
3   libruby.2.1.0.dylib                 0x000000010e1e6723 sigsegv + 131
4   libsystem_platform.dylib            0x00007fffb8defb3a _sigtramp + 26
5   ???                                 0x000000000000001d 0x0 + 29
6   libruby.2.1.0.dylib                 0x000000010e1eea29 st_lookup + 41
7   libruby.2.1.0.dylib                 0x000000010e25ea52 vm_setivar + 322
8   libruby.2.1.0.dylib                 0x000000010e247e22 vm_exec_core + 930
9   libruby.2.1.0.dylib                 0x000000010e258909 vm_exec + 137
10  libruby.2.1.0.dylib                 0x000000010e262968 eval_string_with_cref + 1512
11  libruby.2.1.0.dylib                 0x000000010e255b51 rb_f_eval + 161
12  libruby.2.1.0.dylib                 0x000000010e12a782 bind_eval + 82
13  libruby.2.1.0.dylib                 0x000000010e25d40a vm_call_cfunc + 986
14  libruby.2.1.0.dylib                 0x000000010e24acab vm_exec_core + 12843
15  libruby.2.1.0.dylib                 0x000000010e258909 vm_exec + 137
16  libruby.2.1.0.dylib                 0x000000010e26200b invoke_block_from_c + 2171
17  libruby.2.1.0.dylib                 0x000000010e262cec catch_i + 76
18  libruby.2.1.0.dylib                 0x000000010e256888 rb_catch_protect + 152
19  libruby.2.1.0.dylib                 0x000000010e256e4d rb_f_catch + 77
20  libruby.2.1.0.dylib                 0x000000010e25d40a vm_call_cfunc + 986
21  libruby.2.1.0.dylib                 0x000000010e24aaea vm_exec_core + 12394
22  libruby.2.1.0.dylib                 0x000000010e258909 vm_exec + 137
23  libruby.2.1.0.dylib                 0x000000010e26200b invoke_block_from_c + 2171
24  libruby.2.1.0.dylib                 0x000000010e262cec catch_i + 76
25  libruby.2.1.0.dylib                 0x000000010e256888 rb_catch_protect + 152
26  libruby.2.1.0.dylib                 0x000000010e256e4d rb_f_catch + 77
27  libruby.2.1.0.dylib                 0x000000010e25d40a vm_call_cfunc + 986
28  libruby.2.1.0.dylib                 0x000000010e24aaea vm_exec_core + 12394
29  libruby.2.1.0.dylib                 0x000000010e258909 vm_exec + 137
30  libruby.2.1.0.dylib                 0x000000010e26200b invoke_block_from_c + 2171
31  libruby.2.1.0.dylib                 0x000000010e262d58 loop_i + 40
32  libruby.2.1.0.dylib                 0x000000010e122092 rb_rescue2 + 274
33  libruby.2.1.0.dylib                 0x000000010e256ed3 rb_f_loop + 51
34  libruby.2.1.0.dylib                 0x000000010e25d40a vm_call_cfunc + 986
35  libruby.2.1.0.dylib                 0x000000010e25cd1d vm_call_method + 1037
36  libruby.2.1.0.dylib                 0x000000010e24aaea vm_exec_core + 12394
37  libruby.2.1.0.dylib                 0x000000010e258909 vm_exec + 137
38  libruby.2.1.0.dylib                 0x000000010e26200b invoke_block_from_c + 2171
39  libruby.2.1.0.dylib                 0x000000010e257b51 vm_invoke_proc + 177
40  libruby.2.1.0.dylib                 0x000000010e257a90 rb_vm_invoke_proc + 32
41  libruby.2.1.0.dylib                 0x000000010e128c70 proc_call + 112
42  libruby.2.1.0.dylib                 0x000000010e25d40a vm_call_cfunc + 986
43  libruby.2.1.0.dylib                 0x000000010e25cd1d vm_call_method + 1037
44  libruby.2.1.0.dylib                 0x000000010e24acab vm_exec_core + 12843
45  libruby.2.1.0.dylib                 0x000000010e258909 vm_exec + 137
46  libruby.2.1.0.dylib                 0x000000010e26200b invoke_block_from_c + 2171
47  libruby.2.1.0.dylib                 0x000000010e262cec catch_i + 76
48  libruby.2.1.0.dylib                 0x000000010e256888 rb_catch_protect + 152
49  libruby.2.1.0.dylib                 0x000000010e256e4d rb_f_catch + 77
50  libruby.2.1.0.dylib                 0x000000010e25d40a vm_call_cfunc + 986
51  libruby.2.1.0.dylib                 0x000000010e25cd1d vm_call_method + 1037
52  libruby.2.1.0.dylib                 0x000000010e24aaea vm_exec_core + 12394
53  libruby.2.1.0.dylib                 0x000000010e258909 vm_exec + 137
54  libruby.2.1.0.dylib                 0x000000010e2616ba rb_call0 + 250
55  libruby.2.1.0.dylib                 0x000000010e265957 rb_debug_inspector_open + 855
56  libruby.2.1.0.dylib                 0x000000010e1223f6 rb_ensure + 166
58  libruby.2.1.0.dylib                 0x000000010e269078 exec_hooks_protected + 216
59  libruby.2.1.0.dylib                 0x000000010e266c72 rb_threadptr_exec_event_hooks_orig + 450
60  libruby.2.1.0.dylib                 0x000000010e24a381 vm_exec_core + 10497
61  libruby.2.1.0.dylib                 0x000000010e258909 vm_exec + 137
62  libruby.2.1.0.dylib                 0x000000010e2616ba rb_call0 + 250
63  libruby.2.1.0.dylib                 0x000000010e1776a9 rb_class_new_instance + 41
64  libruby.2.1.0.dylib                 0x000000010e25d40a vm_call_cfunc + 986
65  libruby.2.1.0.dylib                 0x000000010e25cd1d vm_call_method + 1037
66  libruby.2.1.0.dylib                 0x000000010e24acab vm_exec_core + 12843
67  libruby.2.1.0.dylib                 0x000000010e258909 vm_exec + 137
68  libruby.2.1.0.dylib                 0x000000010e26200b invoke_block_from_c + 2171
69  libruby.2.1.0.dylib                 0x000000010e257b51 vm_invoke_proc + 177
70  libruby.2.1.0.dylib                 0x000000010e260891 vm_call0_body + 961
71  libruby.2.1.0.dylib                 0x000000010e254153 rb_vm_call + 51
72  libruby.2.1.0.dylib                 0x000000010e127c40 rb_method_call_with_block + 304
73  libruby.2.1.0.dylib                 0x000000010e25d40a vm_call_cfunc + 986
74  libruby.2.1.0.dylib                 0x000000010e25cd1d vm_call_method + 1037
75  libruby.2.1.0.dylib                 0x000000010e24acab vm_exec_core + 12843
76  libruby.2.1.0.dylib                 0x000000010e258909 vm_exec + 137
77  libruby.2.1.0.dylib                 0x000000010e26200b invoke_block_from_c + 2171
78  libruby.2.1.0.dylib                 0x000000010e257b51 vm_invoke_proc + 177
79  libruby.2.1.0.dylib                 0x000000010e257a90 rb_vm_invoke_proc + 32
80  libruby.2.1.0.dylib                 0x000000010e128c70 proc_call + 112
81  libruby.2.1.0.dylib                 0x000000010e25d40a vm_call_cfunc + 986
82  libruby.2.1.0.dylib                 0x000000010e25cd1d vm_call_method + 1037
83  libruby.2.1.0.dylib                 0x000000010e24acab vm_exec_core + 12843
84  libruby.2.1.0.dylib                 0x000000010e258909 vm_exec + 137
85  libruby.2.1.0.dylib                 0x000000010e26200b invoke_block_from_c + 2171
86  libruby.2.1.0.dylib                 0x000000010e257b51 vm_invoke_proc + 177
87  libruby.2.1.0.dylib                 0x000000010e257a90 rb_vm_invoke_proc + 32
88  libruby.2.1.0.dylib                 0x000000010e128c70 proc_call + 112
89  libruby.2.1.0.dylib                 0x000000010e25d40a vm_call_cfunc + 986
90  libruby.2.1.0.dylib                 0x000000010e25cd1d vm_call_method + 1037
91  libruby.2.1.0.dylib                 0x000000010e24acab vm_exec_core + 12843
92  libruby.2.1.0.dylib                 0x000000010e258909 vm_exec + 137
93  libruby.2.1.0.dylib                 0x000000010e26200b invoke_block_from_c + 2171
94  libruby.2.1.0.dylib                 0x000000010e262cec catch_i + 76
95  libruby.2.1.0.dylib                 0x000000010e256888 rb_catch_protect + 152
96  libruby.2.1.0.dylib                 0x000000010e256e4d rb_f_catch + 77
97  libruby.2.1.0.dylib                 0x000000010e25d40a vm_call_cfunc + 986
98  libruby.2.1.0.dylib                 0x000000010e25cd1d vm_call_method + 1037
99  libruby.2.1.0.dylib                 0x000000010e24aaea vm_exec_core + 12394
100 libruby.2.1.0.dylib                 0x000000010e258909 vm_exec + 137
101 libruby.2.1.0.dylib                 0x000000010e26200b invoke_block_from_c + 2171
102 libruby.2.1.0.dylib                 0x000000010e25535c rb_yield + 156
103 libruby.2.1.0.dylib                 0x000000010e0da619 rb_ary_each + 41
104 libruby.2.1.0.dylib                 0x000000010e25d40a vm_call_cfunc + 986
105 libruby.2.1.0.dylib                 0x000000010e25cd1d vm_call_method + 1037
106 libruby.2.1.0.dylib                 0x000000010e24aaea vm_exec_core + 12394
107 libruby.2.1.0.dylib                 0x000000010e258909 vm_exec + 137
108 libruby.2.1.0.dylib                 0x000000010e26200b invoke_block_from_c + 2171
109 libruby.2.1.0.dylib                 0x000000010e257b51 vm_invoke_proc + 177
110 libruby.2.1.0.dylib                 0x000000010e257a90 rb_vm_invoke_proc + 32
111 libruby.2.1.0.dylib                 0x000000010e128c70 proc_call + 112
112 libruby.2.1.0.dylib                 0x000000010e25d40a vm_call_cfunc + 986
113 libruby.2.1.0.dylib                 0x000000010e25cd1d vm_call_method + 1037
114 libruby.2.1.0.dylib                 0x000000010e24aaea vm_exec_core + 12394
115 libruby.2.1.0.dylib                 0x000000010e258909 vm_exec + 137
116 libruby.2.1.0.dylib                 0x000000010e26200b invoke_block_from_c + 2171
117 libruby.2.1.0.dylib                 0x000000010e257b51 vm_invoke_proc + 177
118 libruby.2.1.0.dylib                 0x000000010e257a90 rb_vm_invoke_proc + 32
119 libruby.2.1.0.dylib                 0x000000010e2716d2 thread_start_func_2 + 498
120 libruby.2.1.0.dylib                 0x000000010e2714c5 thread_start_func_1 + 149
121 libsystem_pthread.dylib             0x00007fffb8df993b _pthread_body + 180
122 libsystem_pthread.dylib             0x00007fffb8df9887 _pthread_body + 0

[AndrewRayCode]

I've narrowed this down to a fairly small test case. This segfaults for me indeterminately, about 50% of the time:

require 'barby/barcode/data_matrix'
require 'barby/outputter/png_outputter'
require 'json'

data = { hello: "TEST TEST TEST TEST" }
barcode = Barby::DataMatrix.new(JSON.generate(data))
code = barcode.to_png

/Users/andy/.rvm/gems/ruby-2.1.5@projecct/gems/barby-0.6.5/lib/barby/barcode/data_matrix.rb:26: [BUG] Segmentation fault at 0x0000000000001d

[AndrewRayCode]

This is kind of baffling. If you change certain things about the above input data, it causes the segfault, and other times it works.

Other four letter words fail:

data = { hello: "BAND BAND BAND BAND" }

But 5 words instead of 4 does not fail:

data = { hello: "BAND BAND BAND BAND BAND" }

[AndrewRayCode]

Happens on Ruby 2.4.1 too, not just the version I'm using (ruby-2.1.5).

[toretore]

Closing this as semacode is no longer used for DataMatrix, and hopefully the bug disappeared with it.