some or many tests fails in Linux under gcc in -prod

[tankf33der]

Only gcc affected. tcc and clang are OK!

$ v doctor
|V full version      |V 0.5.0 bc0bcd39eceed617ce2001b9dfa54f11cdaea840
|:-------------------|:-------------------
|OS                  |linux, N/A
|Processor           |8 cpus, 64bit, little endian, 11th Gen Intel(R) Core(TM) i5-1135G7 @ 2.40GHz
|Memory              |7.47GB/15.36GB
|                    |
|V executable        |/home/mpech/v/v
|V last modified time|2026-02-03 07:01:42
|                    |
|V home dir          |OK, value: /home/mpech/v
|VMODULES            |OK, value: /home/mpech/.vmodules
|VTMP                |OK, value: /tmp/v_1000
|Current working dir |OK, value: /home/mpech/v
|                    |
|Git version         |git version 2.52.0
|V git status        |weekly.2026.05-69-gf5df2768
|.git/config present |true
|                    |
|cc version          |cc (Alpine 15.2.0) 15.2.0
|gcc version         |gcc (Alpine 15.2.0) 15.2.0
|clang version       |Alpine clang version 21.1.2
|tcc version         |tcc version 0.9.27 mob:d3e940c (x86_64 Linux)
|tcc git status      |thirdparty-linuxmusl-amd64 a3e24da2
|emcc version        |N/A
|glibc version       |Error: musl libc (x86_64)
Version 1.2.5
Dynamic Program Loader
Usage: /lib/ld-musl-x86_64.so.1 [options] [--] pathname

Note

You can use the 👍 reaction to increase the issue's priority for developers.

Please note that only the 👍 reaction to the issue itself counts as a vote.
Other reactions and those to comments will not be taken into account.

[tankf33der]

json module:

lambda:~/v$ v -prod -cc gcc test vlib/json/
---- Testing... ----------------------------------------------------------------------------------------------------------------------------
 OK    [ 1/47] C:  9863.2 ms, R:     1.636 ms vlib/json/tests/json_alias_test.v
 OK    [ 2/47] C: 11686.8 ms, R:     1.582 ms vlib/json/cjson/cjson_test.v
 OK    [ 3/47] C: 11757.8 ms, R:     1.511 ms vlib/json/tests/json_decode_option_alias_field_test.v
 OK    [ 4/47] C: 11758.0 ms, R:     1.296 ms vlib/json/tests/json_decode_option_alias_test.v
 OK    [ 5/47] C: 11769.0 ms, R:     1.560 ms vlib/json/tests/json_decode_arr_ref_test.v
 OK    [ 6/47] C: 11780.0 ms, R:     1.216 ms vlib/json/tests/json_decode_anon_struct_test.v
 OK    [ 7/47] C: 12234.2 ms, R:     1.728 ms vlib/json/tests/json_decode_embed_test.v
 OK    [ 8/47] C:  9331.9 ms, R:     1.619 ms vlib/json/tests/json_decode_option_enum_test.v
 OK    [ 9/47] C: 13208.8 ms, R:     1.526 ms vlib/json/tests/json_decode_sumtype_option_test.v
 OK    [10/47] C: 13426.6 ms, R:     1.612 ms vlib/json/tests/json_decode_struct_default_test.v
 OK    [11/47] C: 13484.4 ms, R:     1.550 ms vlib/json/tests/json_decode_struct_ptr_test.v
 OK    [12/47] C: 13018.2 ms, R:     1.587 ms vlib/json/tests/json_decode_with_encode_arg_test.v
 OK    [13/47] C: 13693.5 ms, R:     1.554 ms vlib/json/tests/json_decode_struct_with_default_test.v
 FAIL  [14/47] C: 13971.4 ms, R:     1.678 ms vlib/json/tests/json_decode_test.v
V panic: array.get: index out of range (i,a.len):0, 0
 v hash: bc0bcd3
    pid: 0x6833
    tid: 0x6833
backtrace_symbols is missing => printing backtraces is not available.
Some libc implementations like musl simply do not provide it.
 FAIL  [15/47] C:  2001.1 ms, R:     0.000 ms vlib/json/tests/json_encode_default_option_none_test.v
>> compilation failed:
vlib/json/tests/json_encode_default_option_none_test.v:7:15: error: unnecessary default value of `none`: struct fields are zeroed by default
    5 | 
    6 | struct Test {
    7 |     id ?string = none
      |                  ~~~~
    8 | }
    9 |

 OK    [16/47] C: 10226.4 ms, R:     1.576 ms vlib/json/tests/json_decode_with_generic_array_test.v
 FAIL  [17/47] C: 13012.6 ms, R:     4.774 ms vlib/json/tests/json_decode_with_generic_test.v
User{
    id: -1969735451
    username: ''
}
/home/mpech/v/vlib/json/tests/json_decode_with_generic_test.v:22: ✗ fn test_decode_with_generic_struct
   > assert ret.id == 37467243
     Left value (len: 11): `-1969735451`
    Right value (len: 8): `37467243`
 OK    [18/47] C: 12963.8 ms, R:     3.999 ms vlib/json/tests/json_decode_with_option_arg_test.v
 OK    [19/47] C: 13167.6 ms, R:     1.619 ms vlib/json/tests/json_embed_test.v
 OK    [20/47] C: 14116.1 ms, R:     1.870 ms vlib/json/tests/json_decode_with_sumtype_test.v
 OK    [21/47] C: 14253.4 ms, R:     1.588 ms vlib/json/tests/json_encode_embed_test.v
 OK    [22/47] C: 11844.6 ms, R:     1.056 ms vlib/json/tests/json_encode_map_test.v
 FAIL  [23/47] C: 15414.5 ms, R:     4.690 ms vlib/json/tests/json_encode_enum_test.v
/home/mpech/v/vlib/json/tests/json_encode_enum_test.v:78: ✗ fn test_encode_alias_and_sumtype
  > assert json.decode(TypeNode(main.TestStruct), '{'test':['one','one'],'test2':'two','test3': 'one', 'test4': 'two', 'test5':4}')! == main.TestStruct{....}
    Left value (len: 124):
      `TestStruct{
    test: [one, one]
    test2: two
    test3: TestAlias(one)
    test4: unknown sum type value
    test5: log
}`
    Right value (len: 116):
      `TestStruct{
    test: [one, one]
    test2: two
    test3: TestAlias(one)
    test4: TestSum('two')
    test5: log
}`

[/home/mpech/v/vlib/json/tests/json_encode_enum_test.v:88] json.encode(.log): 4
[/home/mpech/v/vlib/json/tests/json_encode_enum_test.v:89] json.encode(.error): 1
[/home/mpech/v/vlib/json/tests/json_encode_enum_test.v:109] json.encode(main.Test{....}): {}
[/home/mpech/v/vlib/json/tests/json_encode_enum_test.v:110] json.encode(main.Test{....}): {"a":4}
[/home/mpech/v/vlib/json/tests/json_encode_enum_test.v:111] json.decode(TypeNode(main.Test), '{'a':4}')!: Test{
    ab: Option(none)
    a: Option(log)
}
[/home/mpech/v/vlib/json/tests/json_encode_enum_test.v:115] json.decode(TypeNode(main.Test), '{'a':null}')!: Test{
    ab: Option(none)
    a: Option(none)
}
[/home/mpech/v/vlib/json/tests/json_encode_enum_test.v:119] json.encode(main.Test2{....}): {"a":"log"}
[/home/mpech/v/vlib/json/tests/json_encode_enum_test.v:120] json.decode(TypeNode(main.Test2), '{'a':'log'}')!: Test2{
    a: Option(log)
}
[/home/mpech/v/vlib/json/tests/json_encode_enum_test.v:122] json.decode(TypeNode(main.Test2), '{'a': null}')!: Test2{
    a: Option(none)
}
[/home/mpech/v/vlib/json/tests/json_encode_enum_test.v:127] json.encode(main.Test3{....}): {}
[/home/mpech/v/vlib/json/tests/json_encode_enum_test.v:128] json.encode(main.Test3{....}): {"a":"foo"}
[/home/mpech/v/vlib/json/tests/json_encode_enum_test.v:129] json.encode(main.Test3{....}): {"a":2}
[/home/mpech/v/vlib/json/tests/json_encode_enum_test.v:131] json.encode(main.Test4{....}): {}
[/home/mpech/v/vlib/json/tests/json_encode_enum_test.v:132] json.encode(main.Test4{....}): {"a":"foo"}
[/home/mpech/v/vlib/json/tests/json_encode_enum_test.v:133] json.encode(main.Test4{....}): {"a":"warning"}
 OK    [24/47] C: 13744.6 ms, R:     1.729 ms vlib/json/tests/json_encode_ptr_test.v
 OK    [25/47] C: 13440.6 ms, R:     1.485 ms vlib/json/tests/json_encode_recursive_ptr_test.v
 OK    [26/47] C: 14685.6 ms, R:     1.650 ms vlib/json/tests/json_encode_primite_test.v
 OK    [27/47] C: 14423.1 ms, R:     1.741 ms vlib/json/tests/json_encode_struct_with_option_field_test.v
 OK    [28/47] C: 13817.5 ms, R:     1.544 ms vlib/json/tests/json_encode_sumtype_test.v
 OK    [29/47] C: 13055.4 ms, R:     1.560 ms vlib/json/tests/json_encode_with_mut_test.v
 OK    [30/47] C: 14092.6 ms, R:     1.698 ms vlib/json/tests/json_encode_with_ptr_test.v
 OK    [31/47] C: 12341.0 ms, R:     1.559 ms vlib/json/tests/json_fixed_array_test.v
 OK    [32/47] C: 13434.8 ms, R:     1.615 ms vlib/json/tests/json_i32_test.v
 OK    [33/47] C: 13297.4 ms, R:     1.568 ms vlib/json/tests/json_is_null_attr_test.v
 OK    [34/47] C: 12825.4 ms, R:     1.118 ms vlib/json/tests/json_omitempty_test.v
 OK    [35/47] C: 15776.5 ms, R:     1.710 ms vlib/json/tests/json_generic_array_test.v
 OK    [36/47] C: 14110.6 ms, R:     1.505 ms vlib/json/tests/json_mut_map_test.v
 OK    [37/47] C: 13280.8 ms, R:     1.670 ms vlib/json/tests/json_omitempty_types_test.v
 OK    [38/47] C: 13218.0 ms, R:     1.527 ms vlib/json/tests/json_option_alias_test.v
 OK    [39/47] C: 10924.7 ms, R:     1.536 ms vlib/json/tests/json_option_struct_test.v
 OK    [40/47] C: 13440.7 ms, R:     1.653 ms vlib/json/tests/json_option_none_test.v
 OK    [41/47] C: 12960.6 ms, R:     1.782 ms vlib/json/tests/json_option_raw_test.v
 OK    [42/47] C: 12136.4 ms, R:     1.705 ms vlib/json/tests/json_prim_type_validation_test.v
 OK    [43/47] C: 13641.4 ms, R:     1.488 ms vlib/json/tests/json_option_test.v
 OK    [44/47] C: 12076.9 ms, R:     0.971 ms vlib/json/tests/json_raw_test.v
 OK    [45/47] C:  8845.3 ms, R:     0.873 ms vlib/json/tests/json_struct_option_test.v
 OK    [46/47] C:  8867.9 ms, R:     0.921 ms vlib/json/tests/json_sumtype_test.v
 FAIL  [47/47] C: 10233.0 ms, R:     1.123 ms vlib/json/tests/json_test.v
/home/mpech/v/vlib/json/tests/json_test.v:576: ✗ fn test_required
   > assert nullish_third.child.name == 'Nullish'
     Left value (len: 0): ``
    Right value (len: 7): `Nullish`
--------------------------------------------------------------------------------------------------------------------------------------------
To reproduce just failure 1 run:    '/home/mpech/v/v' -prod -cc gcc '/home/mpech/v/vlib/json/tests/json_decode_test.v'
To reproduce just failure 2 run:    '/home/mpech/v/v' -prod -cc gcc -w '/home/mpech/v/vlib/json/tests/json_encode_default_option_none_test.v'
To reproduce just failure 3 run:    '/home/mpech/v/v' -prod -cc gcc '/home/mpech/v/vlib/json/tests/json_decode_with_generic_test.v'
To reproduce just failure 4 run:    '/home/mpech/v/v' -prod -cc gcc '/home/mpech/v/vlib/json/tests/json_encode_enum_test.v'
To reproduce just failure 5 run:    '/home/mpech/v/v' -prod -cc gcc '/home/mpech/v/vlib/json/tests/json_test.v'
Summary for all V _test.v files: 5 failed, 42 passed, 47 total. Elapsed time: 89819 ms, on 7 parallel jobs. Comptime: 586654 ms. Runtime: 78 ms.

[tankf33der]

json2 module:

lambda:~/v$ v -prod -cc gcc test vlib/x/json2/
---- Testing... ----------------------------------------------------------------------------------------------------------------------------
 OK    [ 1/48] C:  5427.0 ms, R:     0.982 ms vlib/x/json2/tests/autofree_json_test.v
 OK    [ 2/48] C:  6755.3 ms, R:     0.861 ms vlib/x/json2/strict/strict_test.v
 OK    [ 3/48] C: 10337.9 ms, R:     1.336 ms vlib/x/json2/scanner_test.v
 OK    [ 4/48] C: 10378.8 ms, R:     0.755 ms vlib/x/json2/tests/attributes_test.v
 OK    [ 5/48] C: 12512.8 ms, R:     1.167 ms vlib/x/json2/tests/checker_test.v
 OK    [ 6/48] C: 13226.1 ms, R:     1.103 ms vlib/x/json2/tests/decode_and_encode_struct_any_test.v
 OK    [ 7/48] C: 15083.5 ms, R:     1.985 ms vlib/x/json2/tests/any_test.v
 OK    [ 8/48] C: 12552.5 ms, R:     1.644 ms vlib/x/json2/tests/decode_array_array_test.v
 FAIL  [ 9/48] C: 11715.7 ms, R:     1.607 ms vlib/x/json2/tests/decode_array_test.v
signal 11: segmentation fault
backtrace_symbols is missing => printing backtraces is not available.
Some libc implementations like musl simply do not provide it.
 OK    [10/48] C: 11713.5 ms, R:     1.130 ms vlib/x/json2/tests/decode_budget_number_test.v
 OK    [11/48] C: 15948.1 ms, R:     1.599 ms vlib/x/json2/tests/decode_escaped_string_test.v
 OK    [12/48] C: 16826.5 ms, R:     1.805 ms vlib/x/json2/tests/decode_enum_test.v
 OK    [13/48] C: 15573.0 ms, R:     1.114 ms vlib/x/json2/tests/decode_fixed_array_test.v
 OK    [14/48] C: 14054.4 ms, R:     1.526 ms vlib/x/json2/tests/decode_map_of_map_test.v
 OK    [15/48] C: 22073.5 ms, R:     1.400 ms vlib/x/json2/tests/decode_custom_test.v
 OK    [16/48] C: 17240.6 ms, R:     1.398 ms vlib/x/json2/tests/decode_map_test.v
 OK    [17/48] C: 13656.0 ms, R:     1.598 ms vlib/x/json2/tests/decode_nested_array_test.v
 OK    [18/48] C: 13659.3 ms, R:     1.572 ms vlib/x/json2/tests/decode_option_test.v
 OK    [19/48] C: 15726.2 ms, R:     4.137 ms vlib/x/json2/tests/decode_option_field_test.v
 OK    [20/48] C: 17811.1 ms, R:     1.157 ms vlib/x/json2/tests/decode_number_and_boolean_test.v
 OK    [21/48] C: 14798.5 ms, R:     1.592 ms vlib/x/json2/tests/decode_string_test.v
 OK    [22/48] C: 18169.7 ms, R:     1.186 ms vlib/x/json2/tests/decode_object_test.v
 OK    [23/48] C: 21830.5 ms, R:     1.769 ms vlib/x/json2/tests/decoder_test.v
 OK    [24/48] C: 10727.9 ms, R:     1.125 ms vlib/x/json2/tests/encode_option_test.v
 OK    [25/48] C: 13229.6 ms, R:     1.644 ms vlib/x/json2/tests/encode_anon_struct_test.v
 OK    [26/48] C: 13482.0 ms, R:     1.645 ms vlib/x/json2/tests/encode_embedded_structs_test.v
 OK    [27/48] C: 24469.8 ms, R:     6.131 ms vlib/x/json2/tests/decode_struct_test.v
 OK    [28/48] C: 16061.3 ms, R:     1.573 ms vlib/x/json2/tests/encode_struct_skippable_fields_test.v
 OK    [29/48] C: 15269.4 ms, R:     1.587 ms vlib/x/json2/tests/issue_25641_test.v
 OK    [30/48] C: 16920.6 ms, R:     1.132 ms vlib/x/json2/tests/integer_primitives_test.v
 OK    [31/48] C: 29634.3 ms, R:     2.550 ms vlib/x/json2/tests/encode_struct_test.v
 OK    [32/48] C: 21121.6 ms, R:     2.064 ms vlib/x/json2/tests/encode_test.v
 OK    [33/48] C: 22700.9 ms, R:     2.074 ms vlib/x/json2/tests/encoder_test.v
 OK    [34/48] C: 21294.4 ms, R:     1.620 ms vlib/x/json2/tests/json2_test.v
 OK    [35/48] C: 18859.6 ms, R:     1.656 ms vlib/x/json2/tests/json2_tests/decode_and_encode_struct_any_test.v
 OK    [36/48] C: 17141.0 ms, R:     1.624 ms vlib/x/json2/tests/json2_tests/decode_map_test.v
 OK    [37/48] C: 20816.7 ms, R:     1.163 ms vlib/x/json2/tests/json2_tests/decode_struct_test.v
 OK    [38/48] C: 19759.8 ms, R:     2.216 ms vlib/x/json2/tests/json2_tests/decoder_test.v
 OK    [39/48] C: 18507.2 ms, R:     1.635 ms vlib/x/json2/tests/json2_tests/encoder_test.v
 OK    [40/48] C: 16953.7 ms, R:     1.741 ms vlib/x/json2/tests/json2_tests/json_module_compatibility_test/json_decode_todo_test.v
 OK    [41/48] C: 21192.3 ms, R:     1.916 ms vlib/x/json2/tests/json2_tests/json2_test.v
 OK    [42/48] C: 24144.8 ms, R:     2.377 ms vlib/x/json2/tests/json2_tests/json_module_compatibility_test/json_test.v
 OK    [43/48] C: 15021.5 ms, R:     1.498 ms vlib/x/json2/tests/json_module_compatibility_test/json_decode_with_encode_arg_test.v
 OK    [44/48] C: 11092.6 ms, R:     0.939 ms vlib/x/json2/tests/json_optional_both_type_field_test.v
 OK    [45/48] C: 11723.1 ms, R:     1.154 ms vlib/x/json2/tests/json_module_compatibility_test/json_decode_with_option_arg_test.v
 OK    [46/48] C: 11174.4 ms, R:     0.920 ms vlib/x/json2/tests/old_json_compatibility/json_decode_struct_default_test.v
 FAIL  [47/48] C: 17044.0 ms, R:     0.954 ms vlib/x/json2/tests/json_sumtype_test.v
/home/mpech/v/vlib/x/json2/tests/json_sumtype_test.v:125: ✗ fn test_sum_type_struct
  > assert x.json2.decode('{'_type': 'Stru', 'val': 1, 'val2': 'lala', 'val3': {'a': 2, 'steak': 'leleu'}, 'val4': 2147483000, 'val5': 2147483000}', x.json2.DecoderOptions{....})! == StructSumTypes(main.Stru{....})
    Left value (len: 22):
      `unknown sum type value`
    Right value (len: 31):
      `StructSumTypes(main.Stru{....})`

/home/mpech/v/vlib/x/json2/tests/json_sumtype_test.v:137: ✗ fn test_sum_type_options_fail
  > assert x.json2.decode('null', x.json2.DecoderOptions{....})! == Maybes(?int(none))
    Left value (len: 22):
      `unknown sum type value`
    Right value (len: 18):
      `Maybes(?int(none))`
 OK    [48/48] C: 18704.5 ms, R:     1.551 ms vlib/x/json2/tests/json_module_compatibility_test/json_test.v
--------------------------------------------------------------------------------------------------------------------------------------------
To reproduce just failure 1 run:    '/home/mpech/v/v' -prod -cc gcc '/home/mpech/v/vlib/x/json2/tests/decode_array_test.v'
To reproduce just failure 2 run:    '/home/mpech/v/v' -prod -cc gcc '/home/mpech/v/vlib/x/json2/tests/json_sumtype_test.v'
Summary for all V _test.v files: 2 failed, 46 passed, 48 total. Elapsed time: 115656 ms, on 7 parallel jobs. Comptime: 774117 ms. Runtime: 78 ms.

[tankf33der]

-prod only!

[tankf33der]

crashes only with -O3 and -flto.

[tankf33der]

Debian the same:

root@lambda:~/v# v doctor
|V full version      |V 0.5.0 48000f4681c4bdae94cf0c45f874ee6d6366081f
|:-------------------|:-------------------
|OS                  |linux, Debian GNU/Linux forky/sid (chroot)
|Processor           |8 cpus, 64bit, little endian, 11th Gen Intel(R) Core(TM) i5-1135G7 @ 2.40GHz
|Memory              |6.36GB/15.36GB
|                    |
|V executable        |/root/v/v
|V last modified time|2026-02-03 11:01:18
|                    |
|V home dir          |OK, value: /root/v
|VMODULES            |OK, value: /root/.vmodules
|VTMP                |OK, value: /tmp/v_0
|Current working dir |OK, value: /root/v
|                    |
|Git version         |git version 2.51.0
|V git status        |weekly.2026.06
|.git/config present |true
|                    |
|cc version          |cc (Debian 15.2.0-12) 15.2.0
|gcc version         |gcc (Debian 15.2.0-12) 15.2.0
|clang version       |Debian clang version 21.1.8 (1+b1)
|tcc version         |tcc version 0.9.28rc 2025-02-13 HEAD@f8bd136d (x86_64 Linux)
|tcc git status      |thirdparty-linux-amd64 696c1d84
|emcc version        |N/A
|glibc version       |ldd (Debian GLIBC 2.42-11+b1) 2.42

root@lambda:~/v# ./v -prod test vlib/x/json2/
---- Testing... ----------------------------------------------------------------------------------------------------------------------------
 OK    [ 1/48] C:  3814.3 ms, R:     1.052 ms vlib/x/json2/tests/autofree_json_test.v
 OK    [ 2/48] C:  5189.5 ms, R:     1.590 ms vlib/x/json2/strict/strict_test.v
 OK    [ 3/48] C:  7552.8 ms, R:     1.506 ms vlib/x/json2/scanner_test.v
 OK    [ 4/48] C:  8437.2 ms, R:     0.992 ms vlib/x/json2/tests/attributes_test.v
 OK    [ 5/48] C:  9207.1 ms, R:     1.065 ms vlib/x/json2/tests/checker_test.v
 OK    [ 6/48] C:  9631.3 ms, R:     1.441 ms vlib/x/json2/tests/decode_and_encode_struct_any_test.v
 OK    [ 7/48] C: 10791.3 ms, R:     2.353 ms vlib/x/json2/tests/any_test.v
 OK    [ 8/48] C:  9142.6 ms, R:     2.194 ms vlib/x/json2/tests/decode_array_array_test.v
 FAIL  [ 9/48] C:  9691.2 ms, R:    28.061 ms vlib/x/json2/tests/decode_array_test.v
V panic: negative .cap:-1330135986
 v hash: 48000f4
    pid: 0x1139
    tid: 0x1139
                                                        | 0x55d51facffd8 | /tmp/v_0/tsession_7f2acfa52740_01KGHJMCJFKPPT4XSV6W1SZWVT/8_1/decode_array_test(+0x2afd8) 
                                                        | 0x55d51fabad14 | /tmp/v_0/tsession_7f2acfa52740_01KGHJMCJFKPPT4XSV6W1SZWVT/8_1/decode_array_test(+0x15d14) 
                                                        | 0x55d51fabf4ae | /tmp/v_0/tsession_7f2acfa52740_01KGHJMCJFKPPT4XSV6W1SZWVT/8_1/decode_array_test(+0x1a4ae) 
                                                        | 0x55d51facc881 | /tmp/v_0/tsession_7f2acfa52740_01KGHJMCJFKPPT4XSV6W1SZWVT/8_1/decode_array_test(+0x27881) 
                                                        | 0x55d51faa7ca5 | /tmp/v_0/tsession_7f2acfa52740_01KGHJMCJFKPPT4XSV6W1SZWVT/8_1/decode_array_test(+0x2ca5) 
                                                        | 0x7f8f36b9ff75 | /usr/lib/x86_64-linux-gnu/libc.so.6(+0x29f75) 
                                                        | 0x7f8f36ba0027 | /usr/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x87) 
                                                        | 0x55d51faa7de1 | /tmp/v_0/tsession_7f2acfa52740_01KGHJMCJFKPPT4XSV6W1SZWVT/8_1/decode_array_test(+0x2de1)
 OK    [10/48] C:  9138.0 ms, R:     1.466 ms vlib/x/json2/tests/decode_budget_number_test.v
 OK    [11/48] C: 10540.7 ms, R:     1.496 ms vlib/x/json2/tests/decode_enum_test.v
 OK    [12/48] C: 11237.8 ms, R:     2.490 ms vlib/x/json2/tests/decode_escaped_string_test.v
 OK    [13/48] C: 10480.9 ms, R:     2.159 ms vlib/x/json2/tests/decode_fixed_array_test.v
 OK    [14/48] C:  9719.7 ms, R:     2.116 ms vlib/x/json2/tests/decode_map_of_map_test.v
 OK    [15/48] C: 15493.1 ms, R:     2.542 ms vlib/x/json2/tests/decode_custom_test.v
 OK    [16/48] C: 12610.6 ms, R:     2.151 ms vlib/x/json2/tests/decode_map_test.v
 OK    [17/48] C: 12186.2 ms, R:     2.041 ms vlib/x/json2/tests/decode_nested_array_test.v
 OK    [18/48] C:  8397.6 ms, R:     1.578 ms vlib/x/json2/tests/decode_option_test.v
 OK    [19/48] C: 11743.8 ms, R:     2.266 ms vlib/x/json2/tests/decode_object_test.v
 OK    [20/48] C: 13131.7 ms, R:     2.026 ms vlib/x/json2/tests/decode_number_and_boolean_test.v
 OK    [21/48] C: 12639.6 ms, R:     2.132 ms vlib/x/json2/tests/decode_option_field_test.v
 OK    [22/48] C: 11412.4 ms, R:     2.111 ms vlib/x/json2/tests/decode_string_test.v
 OK    [23/48] C:  8703.3 ms, R:     2.278 ms vlib/x/json2/tests/encode_anon_struct_test.v
 OK    [24/48] C:  9126.0 ms, R:     2.018 ms vlib/x/json2/tests/encode_embedded_structs_test.v
 OK    [25/48] C:  9486.9 ms, R:     2.101 ms vlib/x/json2/tests/encode_option_test.v
 OK    [26/48] C: 14145.7 ms, R:     2.276 ms vlib/x/json2/tests/decoder_test.v
 OK    [27/48] C: 10696.1 ms, R:     2.177 ms vlib/x/json2/tests/encode_struct_skippable_fields_test.v
 OK    [28/48] C: 17492.3 ms, R:     4.685 ms vlib/x/json2/tests/decode_struct_test.v
 OK    [29/48] C: 10470.0 ms, R:     2.149 ms vlib/x/json2/tests/issue_25641_test.v
 OK    [30/48] C: 11667.1 ms, R:     2.169 ms vlib/x/json2/tests/integer_primitives_test.v
 OK    [31/48] C: 14522.8 ms, R:     2.302 ms vlib/x/json2/tests/encode_test.v
 OK    [32/48] C: 20280.1 ms, R:     2.595 ms vlib/x/json2/tests/encode_struct_test.v
 OK    [33/48] C: 13924.3 ms, R:     1.589 ms vlib/x/json2/tests/encoder_test.v
 OK    [34/48] C: 13524.6 ms, R:     2.101 ms vlib/x/json2/tests/json2_tests/decode_and_encode_struct_any_test.v
 OK    [35/48] C: 15052.0 ms, R:     4.409 ms vlib/x/json2/tests/json2_test.v
 OK    [36/48] C: 11889.3 ms, R:     2.126 ms vlib/x/json2/tests/json2_tests/decode_map_test.v
 OK    [37/48] C: 14454.8 ms, R:     2.141 ms vlib/x/json2/tests/json2_tests/decoder_test.v
 OK    [38/48] C: 14013.0 ms, R:     2.150 ms vlib/x/json2/tests/json2_tests/json2_test.v
 OK    [39/48] C: 14111.3 ms, R:     2.031 ms vlib/x/json2/tests/json2_tests/encoder_test.v
 OK    [40/48] C: 11660.8 ms, R:     2.237 ms vlib/x/json2/tests/json2_tests/json_module_compatibility_test/json_decode_todo_test.v
 OK    [41/48] C: 16882.4 ms, R:     2.224 ms vlib/x/json2/tests/json2_tests/decode_struct_test.v
 OK    [42/48] C: 10786.1 ms, R:     2.122 ms vlib/x/json2/tests/json_module_compatibility_test/json_decode_with_encode_arg_test.v
 OK    [43/48] C: 16918.4 ms, R:     2.407 ms vlib/x/json2/tests/json2_tests/json_module_compatibility_test/json_test.v
 OK    [44/48] C:  7206.4 ms, R:     1.279 ms vlib/x/json2/tests/json_optional_both_type_field_test.v
 OK    [45/48] C:  9176.4 ms, R:     1.271 ms vlib/x/json2/tests/json_module_compatibility_test/json_decode_with_option_arg_test.v
 OK    [46/48] C:  8847.0 ms, R:     1.199 ms vlib/x/json2/tests/old_json_compatibility/json_decode_struct_default_test.v
 OK    [47/48] C: 12424.8 ms, R:     1.342 ms vlib/x/json2/tests/json_module_compatibility_test/json_test.v
 OK    [48/48] C: 11961.1 ms, R:     1.127 ms vlib/x/json2/tests/json_sumtype_test.v
--------------------------------------------------------------------------------------------------------------------------------------------
To reproduce just failure 1 run:    '/root/v/v' -prod '/root/v/vlib/x/json2/tests/decode_array_test.v'
Summary for all V _test.v files: 1 failed, 47 passed, 48 total. Elapsed time: 82187 ms, on 7 parallel jobs. Comptime: 551612 ms. Runtime: 123 ms.

[spytheman]

Try also with -cc gcc -cflags -fno-inline-small-functions -prod

[spytheman]

#1[15:11:42]root@zeus: master ~/v # ./v -prod -cc gcc vlib/x/json2/tests/decode_option_test.v
vlib/x/json2/tests/decode_option_test.v:11: ✗ fn test_main
  > assert '${j1}' == 'F1{
    f: Option(struct {
        a: 1
    })
}'
    Left value (len: 48):
      `F1{
    f: Option(struct {
        a: 0
    })
}`
    Right value (len: 48):
      `F1{
    f: Option(struct {
        a: 1
    })
}`

#1[15:11:58]root@zeus: master ~/v #
#1[15:11:59]root@zeus: master ~/v # ./v -prod -cc gcc -cflags -fno-inline-small-functions vlib/x/json2/tests/decode_option_test.v
#0[15:12:08]root@zeus: master ~/v # ./v version
V 0.5.0 e251944
#0[15:12:11]root@zeus: master ~/v # uname -a
Linux zeus.local 6.1.0-30-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.124-1 (2025-01-12) x86_64 GNU/Linux

[tankf33der]

A lot of FAIL in vlib/.
This is not json-family issue.

[tankf33der]

127 tests fails under -prod. I assume this is many.

--------------------------------------------------------------------------------------------------------------------------------------------
To reproduce just failure 1 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/crypto/ecdsa/example/ensure_compatibility_with_net_openssl_test.v'
To reproduce just failure 2 run:    '/home/tankf33der/v/v' -prod -w '/home/tankf33der/v/vlib/json/tests/json_encode_default_option_none_test.v'
To reproduce just failure 3 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/encoding/xml/query_test.v'
To reproduce just failure 4 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/json/tests/json_decode_with_sumtype_test.v'
To reproduce just failure 5 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/encoding/xml/test/local/13_doctype_element/doctype_test.v'
To reproduce just failure 6 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/json/tests/json_encode_primite_test.v'
To reproduce just failure 7 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/json/tests/json_sumtype_test.v'
To reproduce just failure 8 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/encoding/binary/serialize_test.v'
To reproduce just failure 9 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/json/tests/json_test.v'
To reproduce just failure 10 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/os/dir_expansions_test.v'
To reproduce just failure 11 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/os/find_abs_path_of_executable_test.v'
To reproduce just failure 12 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/net/jsonrpc/jsonrpc_test.v'
To reproduce just failure 13 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/strconv/converter_test.v'
To reproduce just failure 14 run:    '/home/tankf33der/v/v' -prod  -b c '/home/tankf33der/v/vlib/os/os_test.c.v'
To reproduce just failure 15 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/toml/scanner/scanner_test.v'
To reproduce just failure 16 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/v/build_constraint/constraint_test.v'
To reproduce just failure 17 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/toml/tests/compact_test.v'
To reproduce just failure 18 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/toml/tests/nested_test.v'
To reproduce just failure 19 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/toml/tests/strings_test.v'
To reproduce just failure 20 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/toml/tests/table_test.v'
To reproduce just failure 21 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/toml/tests/toml_test.v'
To reproduce just failure 22 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/v/tests/assign/assign_option_of_multi_return_with_heap_test.v'
To reproduce just failure 23 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/v/generics/new_generics_regression_test.v'
To reproduce just failure 24 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/v/tests/builtin_maps/map_and_array_with_fns_test.v'
To reproduce just failure 25 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/net/http/server_test.v'
To reproduce just failure 26 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/v/tests/comptime/comptime_map_generic_test.v'
To reproduce just failure 27 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/x/crypto/curve25519/usage_test.v'
To reproduce just failure 28 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/x/json2/tests/decode_array_array_test.v'
To reproduce just failure 29 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/x/encoding/asn1/element_decode_test.v'
To reproduce just failure 30 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/x/encoding/asn1/ia5string_test.v'
To reproduce just failure 31 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/x/encoding/asn1/public_api_test.v'
To reproduce just failure 32 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/x/encoding/asn1/integer_test.v'
To reproduce just failure 33 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/x/json2/tests/decode_object_test.v'
To reproduce just failure 34 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/x/json2/tests/attributes_test.v'
To reproduce just failure 35 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/x/json2/tests/decode_custom_test.v'
To reproduce just failure 36 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/x/json2/tests/json2_test.v'
To reproduce just failure 37 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/x/json2/tests/json2_tests/json2_test.v'
To reproduce just failure 38 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/x/json2/tests/json_sumtype_test.v'
To reproduce just failure 39 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/veb/tests/handle_split_requests_in_chrome_test.v'
To reproduce just failure 40 run:    '/home/tankf33der/v/v' -prod '/home/tankf33der/v/vlib/vweb/csrf/csrf_test.v'
Summary for all V _test.v files: 40 failed, 2580 passed, 68 skipped, 2688 total. Elapsed time: 196369 ms, on 127 parallel jobs. Comptime: 18897402 ms. Runtime: 470908 ms.

[JalonSolov]

Not seeing the same here...

[jalon@7950x v]$ v -prod test vlib/x/json2
---- Testing... ----------------------------------------------------------------------------------------------------------------------------
 OK    [ 1/48] C:  2810.6 ms, R:     1.980 ms vlib/x/json2/tests/autofree_json_test.v
 OK    [ 2/48] C:  4111.5 ms, R:     4.021 ms vlib/x/json2/tests/encode_embedded_structs_test.v
 OK    [ 3/48] C:  4186.9 ms, R:     3.114 ms vlib/x/json2/tests/encode_anon_struct_test.v
 OK    [ 4/48] C:  4350.1 ms, R:     2.951 ms vlib/x/json2/tests/encode_option_test.v
 OK    [ 5/48] C:  4411.6 ms, R:     2.727 ms vlib/x/json2/strict/strict_test.v
 OK    [ 6/48] C:  4501.9 ms, R:     3.009 ms vlib/x/json2/tests/decode_map_of_map_test.v
 OK    [ 7/48] C:  4835.4 ms, R:     2.924 ms vlib/x/json2/tests/decode_string_test.v
 OK    [ 8/48] C:  5161.2 ms, R:     2.335 ms vlib/x/json2/tests/decode_fixed_array_test.v
 OK    [ 9/48] C:  5175.5 ms, R:     2.709 ms vlib/x/json2/tests/decode_budget_number_test.v
 OK    [10/48] C:  5261.6 ms, R:     2.328 ms vlib/x/json2/tests/decode_option_test.v
 OK    [11/48] C:  5364.1 ms, R:     2.484 ms vlib/x/json2/tests/decode_escaped_string_test.v
 OK    [12/48] C:  5465.7 ms, R:     2.651 ms vlib/x/json2/tests/encode_struct_skippable_fields_test.v
 OK    [13/48] C:  5677.5 ms, R:     2.625 ms vlib/x/json2/scanner_test.v
 OK    [14/48] C:  5722.2 ms, R:     2.545 ms vlib/x/json2/tests/decode_enum_test.v
 FAIL  [15/48] C:  5920.4 ms, R:     2.564 ms vlib/x/json2/tests/decode_array_test.v
/home/jalon/git/v/vlib/x/json2/tests/decode_array_test.v:11: ✗ fn test_array_of_strings
   > assert x.json2.decode('['a', 'b', 'c']', x.json2.DecoderOptions{....})! == ['a', 'b', 'c']
     Left value (len: 2): `[]`
    Right value (len: 15): `['a', 'b', 'c']`
 OK    [16/48] C:  5933.7 ms, R:     2.695 ms vlib/x/json2/tests/decode_nested_array_test.v
 OK    [17/48] C:  5999.7 ms, R:     2.483 ms vlib/x/json2/tests/decode_option_field_test.v
 OK    [18/48] C:  6032.2 ms, R:     8.955 ms vlib/x/json2/tests/decode_map_test.v
 OK    [19/48] C:  6136.9 ms, R:     2.442 ms vlib/x/json2/tests/decode_array_array_test.v
 OK    [20/48] C:  6235.9 ms, R:     2.951 ms vlib/x/json2/tests/decode_object_test.v
 OK    [21/48] C:  6257.5 ms, R:     2.661 ms vlib/x/json2/tests/attributes_test.v
 OK    [22/48] C:  6549.9 ms, R:     2.534 ms vlib/x/json2/tests/checker_test.v
 OK    [23/48] C:  6674.4 ms, R:     2.518 ms vlib/x/json2/tests/decode_number_and_boolean_test.v
 OK    [24/48] C:  6858.1 ms, R:     2.610 ms vlib/x/json2/tests/decoder_test.v
 OK    [25/48] C:  6984.4 ms, R:     2.285 ms vlib/x/json2/tests/decode_and_encode_struct_any_test.v
 OK    [26/48] C:  7161.8 ms, R:     2.326 ms vlib/x/json2/tests/encoder_test.v
 OK    [27/48] C:  7456.3 ms, R:     2.508 ms vlib/x/json2/tests/encode_test.v
 OK    [28/48] C:  7480.8 ms, R:     1.941 ms vlib/x/json2/tests/any_test.v
 OK    [29/48] C:  7703.7 ms, R:     1.915 ms vlib/x/json2/tests/decode_custom_test.v
 OK    [30/48] C:  7886.1 ms, R:     2.576 ms vlib/x/json2/tests/decode_struct_test.v
 OK    [31/48] C:  5149.6 ms, R:     1.721 ms vlib/x/json2/tests/integer_primitives_test.v
 OK    [32/48] C:  4600.3 ms, R:     1.733 ms vlib/x/json2/tests/issue_25641_test.v
 OK    [33/48] C:  8786.4 ms, R:     1.889 ms vlib/x/json2/tests/encode_struct_test.v
 OK    [34/48] C:  2952.2 ms, R:     1.759 ms vlib/x/json2/tests/json_optional_both_type_field_test.v
 OK    [35/48] C:  4660.1 ms, R:     1.713 ms vlib/x/json2/tests/json2_tests/decode_map_test.v
 OK    [36/48] C:  3829.9 ms, R:     1.638 ms vlib/x/json2/tests/json_module_compatibility_test/json_decode_with_encode_arg_test.v
 OK    [37/48] C:  3720.0 ms, R:     1.873 ms vlib/x/json2/tests/json_module_compatibility_test/json_decode_with_option_arg_test.v
 OK    [38/48] C:  4536.5 ms, R:     1.654 ms vlib/x/json2/tests/json2_tests/json_module_compatibility_test/json_decode_todo_test.v
 OK    [39/48] C:  3814.5 ms, R:     1.513 ms vlib/x/json2/tests/old_json_compatibility/json_decode_struct_default_test.v
 OK    [40/48] C:  5713.1 ms, R:     1.731 ms vlib/x/json2/tests/json2_test.v
 OK    [41/48] C:  5139.6 ms, R:     1.725 ms vlib/x/json2/tests/json2_tests/decoder_test.v
 OK    [42/48] C:  5669.7 ms, R:     1.389 ms vlib/x/json2/tests/json2_tests/decode_and_encode_struct_any_test.v
 OK    [43/48] C:  4888.6 ms, R:     1.709 ms vlib/x/json2/tests/json2_tests/encoder_test.v
 OK    [44/48] C:  5685.3 ms, R:     2.948 ms vlib/x/json2/tests/json2_tests/decode_struct_test.v
 OK    [45/48] C:  5265.1 ms, R:     1.551 ms vlib/x/json2/tests/json2_tests/json2_test.v
 OK    [46/48] C:  5810.8 ms, R:     1.574 ms vlib/x/json2/tests/json2_tests/json_module_compatibility_test/json_test.v
 OK    [47/48] C:  5749.5 ms, R:     1.709 ms vlib/x/json2/tests/json_module_compatibility_test/json_test.v
 OK    [48/48] C:  5787.4 ms, R:     1.379 ms vlib/x/json2/tests/json_sumtype_test.v
--------------------------------------------------------------------------------------------------------------------------------------------
To reproduce just failure 1 run:    '/home/jalon/git/v/v' -prod '/home/jalon/git/v/vlib/x/json2/tests/decode_array_test.v'
Summary for all V _test.v files: 1 failed, 47 passed, 48 total. Elapsed time: 11728 ms, on 31 parallel jobs. Comptime: 266065 ms. Runtime: 115 ms.
[jalon@7950x v]$

[JalonSolov]

|V full version      |V 0.5.0 cfc3dd02a369a7b91bd617beebad2ccc979cfe81.c16d11b
|:-------------------|:-------------------
|OS                  |linux, "Manjaro Linux"
|Processor           |32 cpus, 64bit, little endian, AMD Ryzen 9 7950X 16-Core Processor
|Memory              |5.58GB/30.49GB
|                    |
|V executable        |/home/jalon/git/v/v
|V last modified time|2026-02-03 15:28:28
|                    |
|V home dir          |OK, value: /home/jalon/git/v
|VMODULES            |OK, value: /home/jalon/.vmodules
|VTMP                |OK, value: /tmp/v_1000
|Current working dir |OK, value: /home/jalon/git/v
|                    |
|Git version         |git version 2.52.0
|V git status        |weekly.2026.06-3-gc16d11b9-dirty
|.git/config present |true
|                    |
|cc version          |cc (GCC) 15.2.1 20260103
|gcc version         |gcc (GCC) 15.2.1 20260103
|clang version       |clang version 21.1.6
|tcc version         |tcc version 0.9.28rc 2025-02-13 HEAD@f8bd136d (x86_64 Linux)
|tcc git status      |thirdparty-linux-amd64 696c1d84
|emcc version        |N/A
|glibc version       |ldd (GNU libc) 2.42

[JalonSolov]

I do see a panic in json...

---- Testing... ----------------------------------------------------------------------------------------------------------------------------
 FAIL  [ 1/47] C:   804.1 ms, R:     0.000 ms vlib/json/tests/json_encode_default_option_none_test.v
>> compilation failed:
vlib/json/tests/json_encode_default_option_none_test.v:7:15: error: unnecessary default value of `none`: struct fields are zeroed by default
    5 | 
    6 | struct Test {
    7 |     id ?string = none
      |                  ~~~~
    8 | }
    9 |

 OK    [ 2/47] C:  3764.4 ms, R:     3.191 ms vlib/json/tests/json_encode_recursive_ptr_test.v
 OK    [ 3/47] C:  4085.7 ms, R:     8.199 ms vlib/json/tests/json_fixed_array_test.v
 OK    [ 4/47] C:  4264.9 ms, R:     2.466 ms vlib/json/tests/json_encode_with_mut_test.v
 OK    [ 5/47] C:  4281.1 ms, R:     3.111 ms vlib/json/tests/json_decode_with_option_arg_test.v
 OK    [ 6/47] C:  4298.4 ms, R:     2.462 ms vlib/json/tests/json_encode_sumtype_test.v
 OK    [ 7/47] C:  4359.3 ms, R:     3.823 ms vlib/json/tests/json_decode_with_encode_arg_test.v
 OK    [ 8/47] C:  4406.5 ms, R:     3.417 ms vlib/json/tests/json_encode_ptr_test.v
 OK    [ 9/47] C:  4411.1 ms, R:     4.400 ms vlib/json/tests/json_decode_struct_default_test.v
 OK    [10/47] C:  4410.8 ms, R:     4.998 ms vlib/json/tests/json_decode_arr_ref_test.v
 OK    [11/47] C:  4418.3 ms, R:     2.364 ms vlib/json/tests/json_encode_map_test.v
 OK    [12/47] C:  4477.8 ms, R:     2.599 ms vlib/json/tests/json_decode_option_enum_test.v
 OK    [13/47] C:  4489.1 ms, R:     2.586 ms vlib/json/tests/json_encode_with_ptr_test.v
 OK    [14/47] C:  4533.9 ms, R:     2.674 ms vlib/json/cjson/cjson_test.v
 OK    [15/47] C:  4546.0 ms, R:     2.696 ms vlib/json/tests/json_decode_struct_ptr_test.v
 OK    [16/47] C:  4560.7 ms, R:     2.087 ms vlib/json/tests/json_decode_option_alias_field_test.v
 OK    [17/47] C:  4566.3 ms, R:     4.632 ms vlib/json/tests/json_decode_anon_struct_test.v
 OK    [18/47] C:  4586.0 ms, R:     3.646 ms vlib/json/tests/json_decode_option_alias_test.v
 FAIL  [19/47] C:  4591.0 ms, R:     2.634 ms vlib/json/tests/json_encode_primite_test.v
[/home/jalon/git/v/vlib/json/tests/json_encode_primite_test.v:16] encoded: {"field":"foo"}
/home/jalon/git/v/vlib/json/tests/json_encode_primite_test.v:17: ✗ fn test_alias_to_primitive
  > assert json.decode(TypeNode(main.Test), '{'field':  'foo'}')!.field == MySumType('foo')
    Left value (len: 22):
      `unknown sum type value`
    Right value (len: 16):
      `MySumType('foo')`
 OK    [20/47] C:  4630.2 ms, R:     2.497 ms vlib/json/tests/json_decode_embed_test.v
 OK    [21/47] C:  4648.1 ms, R:     2.531 ms vlib/json/tests/json_encode_embed_test.v
 OK    [22/47] C:  4645.8 ms, R:     6.468 ms vlib/json/tests/json_decode_sumtype_option_test.v
 OK    [23/47] C:  4662.7 ms, R:     3.170 ms vlib/json/tests/json_decode_with_generic_test.v
 FAIL  [24/47] C:  4661.5 ms, R:    20.764 ms vlib/json/tests/json_decode_with_sumtype_test.v
signal 11: segmentation fault
                                                        | 0x563e7bf68348 | /tmp/v_1000/tsession_7fa8673b0740_01KGJ35X8V8AZC68Y3B35WAF3V/17_17/json_decode_with_sumtype_test(+0x1d348) 
                                                        | 0x563e7bf694b6 | /tmp/v_1000/tsession_7fa8673b0740_01KGJ35X8V8AZC68Y3B35WAF3V/17_17/json_decode_with_sumtype_test(+0x1e4b6) 
                                                        | 0x563e7bf4dce5 | /tmp/v_1000/tsession_7fa8673b0740_01KGJ35X8V8AZC68Y3B35WAF3V/17_17/json_decode_with_sumtype_test(+0x2ce5) 
                                                        | 0x7f7df3da7635 | /usr/lib/libc.so.6(+0x27635) 
                                                        | 0x7f7df3da76e9 | /usr/lib/libc.so.6(__libc_start_main+0x89) 
                                                        | 0x563e7bf4df75 | /tmp/v_1000/tsession_7fa8673b0740_01KGJ35X8V8AZC68Y3B35WAF3V/17_17/json_decode_with_sumtype_test(+0x2f75)
 OK    [25/47] C:  4726.7 ms, R:     2.628 ms vlib/json/tests/json_alias_test.v
 OK    [26/47] C:  4727.0 ms, R:     1.737 ms vlib/json/tests/json_encode_struct_with_option_field_test.v
 OK    [27/47] C:  4730.5 ms, R:     1.585 ms vlib/json/tests/json_decode_with_generic_array_test.v
 OK    [28/47] C:  4788.1 ms, R:     3.069 ms vlib/json/tests/json_decode_test.v
 OK    [29/47] C:  4789.2 ms, R:     3.346 ms vlib/json/tests/json_decode_struct_with_default_test.v
 OK    [30/47] C:  4824.2 ms, R:     1.902 ms vlib/json/tests/json_embed_test.v
 OK    [31/47] C:  4940.6 ms, R:     1.761 ms vlib/json/tests/json_encode_enum_test.v
 OK    [32/47] C:  4669.2 ms, R:     1.767 ms vlib/json/tests/json_generic_array_test.v
 OK    [33/47] C:  3157.2 ms, R:     1.732 ms vlib/json/tests/json_i32_test.v
 OK    [34/47] C:  2835.1 ms, R:     1.980 ms vlib/json/tests/json_omitempty_test.v
 OK    [35/47] C:  3089.4 ms, R:     1.612 ms vlib/json/tests/json_is_null_attr_test.v
 OK    [36/47] C:  2994.7 ms, R:     1.522 ms vlib/json/tests/json_omitempty_types_test.v
 OK    [37/47] C:  2891.9 ms, R:     1.536 ms vlib/json/tests/json_option_struct_test.v
 OK    [38/47] C:  2836.1 ms, R:     1.748 ms vlib/json/tests/json_prim_type_validation_test.v
 OK    [39/47] C:  2832.5 ms, R:     1.814 ms vlib/json/tests/json_raw_test.v
 OK    [40/47] C:  2964.8 ms, R:     1.766 ms vlib/json/tests/json_option_alias_test.v
 OK    [41/47] C:  2920.1 ms, R:     1.595 ms vlib/json/tests/json_option_raw_test.v
 OK    [42/47] C:  3093.1 ms, R:     1.573 ms vlib/json/tests/json_mut_map_test.v
 OK    [43/47] C:  2960.2 ms, R:     1.491 ms vlib/json/tests/json_option_none_test.v
 OK    [44/47] C:  2983.9 ms, R:     1.445 ms vlib/json/tests/json_option_test.v
 OK    [45/47] C:  2942.3 ms, R:     1.485 ms vlib/json/tests/json_struct_option_test.v
 OK    [46/47] C:  3113.9 ms, R:     1.489 ms vlib/json/tests/json_sumtype_test.v
 OK    [47/47] C:  4298.6 ms, R:     1.625 ms vlib/json/tests/json_test.v
--------------------------------------------------------------------------------------------------------------------------------------------
To reproduce just failure 1 run:    '/home/jalon/git/v/v' -prod -w '/home/jalon/git/v/vlib/json/tests/json_encode_default_option_none_test.v'
To reproduce just failure 2 run:    '/home/jalon/git/v/v' -prod '/home/jalon/git/v/vlib/json/tests/json_encode_primite_test.v'
To reproduce just failure 3 run:    '/home/jalon/git/v/v' -prod '/home/jalon/git/v/vlib/json/tests/json_decode_with_sumtype_test.v'
Summary for all V _test.v files: 3 failed, 44 passed, 47 total. Elapsed time: 8872 ms, on 31 parallel jobs. Comptime: 187212 ms. Runtime: 139 ms.