Short answer: Check messages.pl In tyring to locate the source of this error message % The following threads wouldn't die: ['httpd@8080_1'] First searched GitHub for The following threads wouldn't die with no luck. Then Googled for The following threads wouldn't die which a few entries down lis…

git grep also does miracles :slight_smile: The actual cause is hinted at with halt/1: threads are aborted and joined, but those not responding within a second are forcefully cancelled. Typically is because they are running foreign code that does not do signal processing.

Sometimes you just can't get an exact match on an SWI-Prolog error message

Nice to know

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Sometimes you just can't get an exact match on an SWI-Prolog error message

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