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type inference stackoverflow #43050

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type inference stackoverflow#43050

Description

@maartenvd

maartenvd
openedon Nov 12, 2021

An inference stackoverflow encountered rather deep in some code, so it's hard to provide a minimal example (I can post the full code if necessary, but it's really quite large). This same code errors on 1.6.x, but luckily keeps running on v1.7.0 rc2. There are a number of similar issues, but I didn't find the exact same one.

versioninfo

julia> versioninfo()
Julia Version 1.7.0-rc2
Commit f23fc0d27a (2021-10-20 12:45 UTC)
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-12.0.1 (ORCJIT, skylake)
Environment:
  JULIA_NUM_THREADS = 2

stacktrace

Internal error: encountered unexpected error in runtime:
StackOverflowError()
intersect_aside at /home/maarten/julia/src/subtype.c:2131
intersect_var at /home/maarten/julia/src/subtype.c:2284
intersect at /home/maarten/julia/src/subtype.c:3057
intersect_all at /home/maarten/julia/src/subtype.c:3175
intersect_aside at /home/maarten/julia/src/subtype.c:2131
intersect_var at /home/maarten/julia/src/subtype.c:2334
intersect at /home/maarten/julia/src/subtype.c:3057
intersect_all at /home/maarten/julia/src/subtype.c:3175
intersect_aside at /home/maarten/julia/src/subtype.c:2131
intersect_var at /home/maarten/julia/src/subtype.c:2284
intersect at /home/maarten/julia/src/subtype.c:3057
intersect_all at /home/maarten/julia/src/subtype.c:3175
intersect_aside at /home/maarten/julia/src/subtype.c:2131
intersect_var at /home/maarten/julia/src/subtype.c:2334
intersect at /home/maarten/julia/src/subtype.c:3057
intersect_all at /home/maarten/julia/src/subtype.c:3175
intersect_aside at /home/maarten/julia/src/subtype.c:2131
intersect_var at /home/maarten/julia/src/subtype.c:2284
intersect at /home/maarten/julia/src/subtype.c:3057
intersect_all at /home/maarten/julia/src/subtype.c:3175
intersect_aside at /home/maarten/julia/src/subtype.c:2131
intersect_var at /home/maarten/julia/src/subtype.c:2334
intersect at /home/maarten/julia/src/subtype.c:3057
intersect_all at /home/maarten/julia/src/subtype.c:3175
intersect_aside at /home/maarten/julia/src/subtype.c:2131
intersect_var at /home/maarten/julia/src/subtype.c:2284
intersect at /home/maarten/julia/src/subtype.c:3057
...
intersect_all at /home/maarten/julia/src/subtype.c:3175
intersect_aside at /home/maarten/julia/src/subtype.c:2131
intersect_var at /home/maarten/julia/src/subtype.c:2284
intersect at /home/maarten/julia/src/subtype.c:3057
intersect_all at /home/maarten/julia/src/subtype.c:3175
intersect_aside at /home/maarten/julia/src/subtype.c:2131
intersect_var at /home/maarten/julia/src/subtype.c:2334
intersect at /home/maarten/julia/src/subtype.c:3057
intersect_all at /home/maarten/julia/src/subtype.c:3175
intersect_aside at /home/maarten/julia/src/subtype.c:2131
intersect_var at /home/maarten/julia/src/subtype.c:2334
intersect at /home/maarten/julia/src/subtype.c:3057
intersect_union at /home/maarten/julia/src/subtype.c:2154
intersect at /home/maarten/julia/src/subtype.c:3073
intersect_unionall_ at /home/maarten/julia/src/subtype.c:2578
intersect_unionall at /home/maarten/julia/src/subtype.c:2623
intersect at /home/maarten/julia/src/subtype.c:3106
intersect_all at /home/maarten/julia/src/subtype.c:3175
intersect_aside at /home/maarten/julia/src/subtype.c:2131
var_lt at /home/maarten/julia/src/subtype.c:623
subtype at /home/maarten/julia/src/subtype.c:1231
forall_exists_equal at /home/maarten/julia/src/subtype.c:1383
subtype at /home/maarten/julia/src/subtype.c:1306
subtype_unionall at /home/maarten/julia/src/subtype.c:807
subtype at /home/maarten/julia/src/subtype.c:1257
subtype_unionall at /home/maarten/julia/src/subtype.c:807
subtype at /home/maarten/julia/src/subtype.c:1257
exists_subtype at /home/maarten/julia/src/subtype.c:1395 [inlined]
forall_exists_subtype at /home/maarten/julia/src/subtype.c:1423
subtype_ccheck at /home/maarten/julia/src/subtype.c:555
var_lt at /home/maarten/julia/src/subtype.c:618
subtype at /home/maarten/julia/src/subtype.c:1231
exists_subtype at /home/maarten/julia/src/subtype.c:1395 [inlined]
forall_exists_subtype at /home/maarten/julia/src/subtype.c:1423
subtype_in_env_ at /home/maarten/julia/src/subtype.c:1899
subtype_bounds_in_env at /home/maarten/julia/src/subtype.c:1909 [inlined]
subtype_in_env_existential at /home/maarten/julia/src/subtype.c:2241
intersect_invariant at /home/maarten/julia/src/subtype.c:2889
intersect at /home/maarten/julia/src/subtype.c:3130
intersect_tuple at /home/maarten/julia/src/subtype.c:2770 [inlined]
intersect at /home/maarten/julia/src/subtype.c:3124
intersect_unionall_ at /home/maarten/julia/src/subtype.c:2574
intersect_unionall at /home/maarten/julia/src/subtype.c:2623
intersect at /home/maarten/julia/src/subtype.c:3109
intersect_unionall_ at /home/maarten/julia/src/subtype.c:2574
intersect_unionall at /home/maarten/julia/src/subtype.c:2623
intersect at /home/maarten/julia/src/subtype.c:3109
intersect_unionall_ at /home/maarten/julia/src/subtype.c:2578
intersect_unionall at /home/maarten/julia/src/subtype.c:2623
intersect at /home/maarten/julia/src/subtype.c:3083
intersect_all at /home/maarten/julia/src/subtype.c:3175
jl_type_intersection_env_s at /home/maarten/julia/src/subtype.c:3417
jl_type_intersection2 at /home/maarten/julia/src/gf.c:1609 [inlined]
ml_matches at /home/maarten/julia/src/gf.c:2959
jl_matching_methods at /home/maarten/julia/src/gf.c:1895
_methods_by_ftype at ./reflection.jl:908 [inlined]
#findall#246 at ./compiler/methodtable.jl:68 [inlined]
findall##kw at ./compiler/methodtable.jl:65
jfptr_findallYY.YY.kw_8814 at /home/maarten/julia/usr/lib/julia/sys.so (unknown line)
_jl_invoke at /home/maarten/julia/src/gf.c:2247 [inlined]
jl_apply_generic at /home/maarten/julia/src/gf.c:2429
#249 at ./compiler/methodtable.jl:97
get! at ./iddict.jl:178 [inlined]
#findall#248 at ./compiler/methodtable.jl:96 [inlined]
findall##kw at ./compiler/methodtable.jl:95
jfptr_findallYY.YY.kw_8807 at /home/maarten/julia/usr/lib/julia/sys.so (unknown line)
_jl_invoke at /home/maarten/julia/src/gf.c:2247 [inlined]
jl_apply_generic at /home/maarten/julia/src/gf.c:2429
find_matching_methods at ./compiler/abstractinterpretation.jl:308
abstract_call_gf_by_type at ./compiler/abstractinterpretation.jl:39
abstract_call_known at ./compiler/abstractinterpretation.jl:1319
abstract_call at ./compiler/abstractinterpretation.jl:1374
abstract_call at ./compiler/abstractinterpretation.jl:1359
abstract_eval_statement at ./compiler/abstractinterpretation.jl:1514
typeinf_local at ./compiler/abstractinterpretation.jl:1897
typeinf_nocycle at ./compiler/abstractinterpretation.jl:1993
_typeinf at ./compiler/typeinfer.jl:226
typeinf at ./compiler/typeinfer.jl:209
typeinf_edge at ./compiler/typeinfer.jl:823 [inlined]
abstract_call_method at ./compiler/abstractinterpretation.jl:504
abstract_call_gf_by_type at ./compiler/abstractinterpretation.jl:105
abstract_call at ./compiler/abstractinterpretation.jl:1372
abstract_call at ./compiler/abstractinterpretation.jl:1359
abstract_eval_statement at ./compiler/abstractinterpretation.jl:1514
typeinf_local at ./compiler/abstractinterpretation.jl:1897
typeinf_nocycle at ./compiler/abstractinterpretation.jl:1993
_typeinf at ./compiler/typeinfer.jl:226
typeinf at ./compiler/typeinfer.jl:209
typeinf_edge at ./compiler/typeinfer.jl:823 [inlined]
abstract_call_method at ./compiler/abstractinterpretation.jl:504
abstract_call_gf_by_type at ./compiler/abstractinterpretation.jl:105
abstract_call_known at ./compiler/abstractinterpretation.jl:1319
abstract_call at ./compiler/abstractinterpretation.jl:1374
abstract_call at ./compiler/abstractinterpretation.jl:1359
abstract_eval_statement at ./compiler/abstractinterpretation.jl:1514
typeinf_local at ./compiler/abstractinterpretation.jl:1897
typeinf_nocycle at ./compiler/abstractinterpretation.jl:1993
_typeinf at ./compiler/typeinfer.jl:226
typeinf at ./compiler/typeinfer.jl:209
typeinf_edge at ./compiler/typeinfer.jl:823 [inlined]
abstract_call_method at ./compiler/abstractinterpretation.jl:504
abstract_call_gf_by_type at ./compiler/abstractinterpretation.jl:105
abstract_call_known at ./compiler/abstractinterpretation.jl:1319
abstract_call at ./compiler/abstractinterpretation.jl:1374
abstract_call at ./compiler/abstractinterpretation.jl:1359
abstract_eval_statement at ./compiler/abstractinterpretation.jl:1514
typeinf_local at ./compiler/abstractinterpretation.jl:1879
typeinf_nocycle at ./compiler/abstractinterpretation.jl:1993
_typeinf at ./compiler/typeinfer.jl:226
typeinf at ./compiler/typeinfer.jl:209
typeinf_edge at ./compiler/typeinfer.jl:823 [inlined]
abstract_call_method at ./compiler/abstractinterpretation.jl:504
abstract_call_gf_by_type at ./compiler/abstractinterpretation.jl:105
abstract_call_known at ./compiler/abstractinterpretation.jl:1319
abstract_call at ./compiler/abstractinterpretation.jl:1374
abstract_call at ./compiler/abstractinterpretation.jl:1359
abstract_eval_statement at ./compiler/abstractinterpretation.jl:1514
typeinf_local at ./compiler/abstractinterpretation.jl:1897
typeinf_nocycle at ./compiler/abstractinterpretation.jl:1993
_typeinf at ./compiler/typeinfer.jl:226
typeinf at ./compiler/typeinfer.jl:209
typeinf_edge at ./compiler/typeinfer.jl:823 [inlined]
abstract_call_method at ./compiler/abstractinterpretation.jl:504
abstract_call_gf_by_type at ./compiler/abstractinterpretation.jl:105
abstract_call_known at ./compiler/abstractinterpretation.jl:1319
abstract_call at ./compiler/abstractinterpretation.jl:1374
abstract_call at ./compiler/abstractinterpretation.jl:1359
abstract_eval_statement at ./compiler/abstractinterpretation.jl:1514
typeinf_local at ./compiler/abstractinterpretation.jl:1897
typeinf_nocycle at ./compiler/abstractinterpretation.jl:1993
_typeinf at ./compiler/typeinfer.jl:226
typeinf at ./compiler/typeinfer.jl:209
typeinf_edge at ./compiler/typeinfer.jl:823 [inlined]
abstract_call_method at ./compiler/abstractinterpretation.jl:504
abstract_call_gf_by_type at ./compiler/abstractinterpretation.jl:105
abstract_call_known at ./compiler/abstractinterpretation.jl:1319
abstract_call at ./compiler/abstractinterpretation.jl:1374
abstract_call at ./compiler/abstractinterpretation.jl:1359
abstract_eval_statement at ./compiler/abstractinterpretation.jl:1514
typeinf_local at ./compiler/abstractinterpretation.jl:1879
typeinf_nocycle at ./compiler/abstractinterpretation.jl:1993
_typeinf at ./compiler/typeinfer.jl:226
typeinf at ./compiler/typeinfer.jl:209
typeinf_ext at ./compiler/typeinfer.jl:909
typeinf_ext_toplevel at ./compiler/typeinfer.jl:942
typeinf_ext_toplevel at ./compiler/typeinfer.jl:938
jfptr_typeinf_ext_toplevel_9135 at /home/maarten/julia/usr/lib/julia/sys.so (unknown line)
_jl_invoke at /home/maarten/julia/src/gf.c:2247 [inlined]
jl_apply_generic at /home/maarten/julia/src/gf.c:2429
jl_apply at /home/maarten/julia/src/julia.h:1790 [inlined]
jl_type_infer at /home/maarten/julia/src/gf.c:295
jl_generate_fptr at /home/maarten/julia/src/jitlayers.cpp:338
jl_compile_method_internal at /home/maarten/julia/src/gf.c:1980
jl_compile_method_internal at /home/maarten/julia/src/gf.c:2246 [inlined]
_jl_invoke at /home/maarten/julia/src/gf.c:2239 [inlined]
jl_apply_generic at /home/maarten/julia/src/gf.c:2429
jl_apply at /home/maarten/julia/src/julia.h:1790 [inlined]
start_task at /home/maarten/julia/src/task.c:875
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    bugIndicates an unexpected problem or unintended behaviorcompiler:inferenceType inference

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