# Segfault in DataStructures.jl

**URL:** <https://discourse.julialang.org/t/segfault-in-datastructures-jl/92913>\
**Category:** General Usage\
**Tags:** segfault\
**Created:** [January 13, 2023, 9:44am UTC](https://discourse.julialang.org/t/segfault-in-datastructures-jl/92913 "2023-01-13T09:44:01Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Joseph\_Bradley](https://avatars.discourse-cdn.com/v4/letter/j/49beb7/32.png) [@Joseph\_Bradley](https://discourse.julialang.org/u/Joseph_Bradley)\
**Post date:** [January 13, 2023, 9:44am UTC](https://discourse.julialang.org/t/segfault-in-datastructures-jl/92913/1 "2023-01-13T09:44:01Z")

</div>

I am getting the following segfault in the midst of some other code:

```julia
signal (11): Segmentation fault: 11
in expression starting at REPL[67]:1
gc_mark_loop at /Applications/Julia-1.8.app/Contents/Resources/julia/lib/julia/libjulia-internal.1.8.dylib (unknown line)
_jl_gc_collect at /Applications/Julia-1.8.app/Contents/Resources/julia/lib/julia/libjulia-internal.1.8.dylib (unknown line)
ijl_gc_collect at /Applications/Julia-1.8.app/Contents/Resources/julia/lib/julia/libjulia-internal.1.8.dylib (unknown line)
jl_gc_pool_alloc_inner at /Applications/Julia-1.8.app/Contents/Resources/julia/lib/julia/libjulia-internal.1.8.dylib (unknown line)
jl_gc_alloc at /Applications/Julia-1.8.app/Contents/Resources/julia/lib/julia/libjulia-internal.1.8.dylib (unknown line)
ijl_new_bits at /Applications/Julia-1.8.app/Contents/Resources/julia/lib/julia/libjulia-internal.1.8.dylib (unknown line)
ijl_get_nth_field at /Applications/Julia-1.8.app/Contents/Resources/julia/lib/julia/libjulia-internal.1.8.dylib (unknown line)
ijl_get_nth_field_checked at /Applications/Julia-1.8.app/Contents/Resources/julia/lib/julia/libjulia-internal.1.8.dylib (unknown line)
jl_f_getfield at /Applications/Julia-1.8.app/Contents/Resources/julia/lib/julia/libjulia-internal.1.8.dylib (unknown line)
getproperty at ./Base.jl:38 [inlined]
setindex! at /Users/josephbradley/.julia/packages/DataStructures/59MD0/src/delegate.jl:37 [inlined]
...

```

I can’t share an easy MWE but ATM I’m just looking for advice on how to go about debugging the segfault, and wondering if anyone else has had similar crashes with DataStructures.jl/Base in the past?