IUP gc segfault

[vtjnash]

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|__/                   |  x86_64-linux-gnu

julia> Pkg.clone("git@github.com:joa-quim/IUP.jl.git")
INFO: Cloning IUP from git@github.com:joa-quim/IUP.jl.git
INFO: Computing changes...

julia> push!(LOAD_PATH,"/home/jameson/.julia/IUP/src")
3-element Array{Union(UTF8String,ASCIIString),1}:
 "/home/jameson/julia/usr/local/share/julia/site/v0.4"
 "/home/jameson/julia/usr/share/julia/site/v0.4"      
 "/home/jameson/.julia/IUP/src"                       

julia> using IUP_CD

julia> gc()

signal (11): Segmentation fault
unknown function (ip: 1621591399)
unknown function (ip: 1621592616)
unknown function (ip: 1621590694)
unknown function (ip: 1621592616)
unknown function (ip: 1621590694)
unknown function (ip: 1621590694)
unknown function (ip: 1621592616)
unknown function (ip: 1621590694)
unknown function (ip: 1621590694)
unknown function (ip: 1621590694)
unknown function (ip: 1621597526)
unknown function (ip: 1621594102)
unknown function (ip: 1621590694)
unknown function (ip: 1621590694)
unknown function (ip: 1621592616)
unknown function (ip: 1621590694)
unknown function (ip: 1621601038)
jl_gc_collect at /home/jameson/julia/usr/bin/../lib/libjulia.so (unknown line)
gc at base.jl:159
jlcall_gc_42631 at  (unknown line)
jl_apply_generic at /home/jameson/julia/usr/bin/../lib/libjulia.so (unknown line)
unknown function (ip: 1621491212)
unknown function (ip: 1621488418)
unknown function (ip: 1621563269)
jl_toplevel_eval_in at /home/jameson/julia/usr/bin/../lib/libjulia.so (unknown line)
eval_user_input at REPL.jl:54
jlcall_eval_user_input_42551 at  (unknown line)
jl_apply_generic at /home/jameson/julia/usr/bin/../lib/libjulia.so (unknown line)
anonymous at task.jl:83
unknown function (ip: 1621518049)
unknown function (ip: 0)
Segmentation fault (core dumped)

(no IUP binaries needed to reproduce, we're just testing the parsing stuff here)

[vtjnash]

@carnaval / @JeffBezanson the problem is that the generational gc doesn't realize that a datatype's size is dependent on it's nfields:

e.g., we branch from here with v == IUP_CD.Array_1024_Uint8

gc.c
1627         MARK(v, bits = gc_setmark(v, jl_datatype_size(dt), GC_MARKED_NOESC));

but we allocated it from here:

jl_datatype_t *jl_new_uninitialized_datatype(size_t nfields)
{
    return (jl_datatype_t*)
        newobj((jl_value_t*)jl_datatype_type,
               NWORDS(sizeof(jl_datatype_t) - sizeof(void*) +
                      nfields*sizeof(jl_fielddesc_t)));
}

[pao]

Note to self to check #10249 once #10591 is fixed, in the unlikely event that this helped.

[vtjnash]

Unlikely, given that this was a deterministic segfault

[pao]

#10249 is deterministic as well (100% failure rate when gc() is run).

[vtjnash]

Ah ok, I didn't quite realize that. Although this one happens on all computers, not just windows.

[tkelman]

And just a subset of Windows machines, likely having to do with some corporate policy setting or common piece of other software installed at the same time. (maybe #10390, restrictions on large virtual memory allocation?)

[pao]

maybe #10390, restrictions on large virtual memory allocation?

I don't think that's it, but interesting thought (though this is the wrong issue).