Segfault on dictionary update in do block

Adam

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Oct 30, 2019, 7:41:36 AM10/30/19

to Kona Users

{p[`a]:1;do[1;p[`b]:2];p}[]

Causes a core dump (for me at least) on the current codebase (on Ubuntu 18.04.2 LTS)

pahihu

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Oct 30, 2019, 8:41:48 AM10/30/19

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Using https://github.com/pahihu/kona on macOS 10.13.6 gives me

{p[`a]:1;do[1;p[`b]:2];p}[]

.((`a;1;)

(`b;2;()))

pahihu

Adam

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Oct 30, 2019, 9:57:22 AM10/30/19

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Ubuntu gives the same segfault on this fork too for me.

Adam

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Oct 30, 2019, 10:19:04 AM10/30/19

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In either case, we're getting in to an unhappy loop on line 77 of km.c. We seem to be attemping to free an object that is has a 2-cycle in it.

Tom Szczesny

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Oct 30, 2019, 6:29:27 PM10/30/19

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Hey Adam --

Thanks again.

The bug causing the segfault in Kona was introduced by the commit made on April 3, 2016 attempting to fix issue #423: 'value error' for any defined variable

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