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Assertion failure in mrb_write_barrier #3689

clayton-shopify opened this issue Jun 2, 2017 · 1 comment

Assertion failure in mrb_write_barrier #3689

clayton-shopify opened this issue Jun 2, 2017 · 1 comment


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@clayton-shopify clayton-shopify commented Jun 2, 2017

The following input demonstrates an assertion failure:

ObjectSpace.each_object{ GC.generational_mode = nil }

Assertion failed: (((gc)->generational) || gc->state != MRB_GC_STATE_ROOT), function mrb_write_barrier, file /Users/clayton/git/mruby/src/gc.c, line 1304.

This issue was reported by Dinko Galetic & Denis Kasak (

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@matz matz commented Jun 3, 2017

It turns out it's (almost) impossible to keep consistency in GC after changing generational mode during iteration. I will make it impossible by raising an exception.

@matz matz closed this as completed in c9a4f8a Jun 3, 2017
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