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Bug #15360

Updated by brockspratlen (Brock Spratlen) about 1 year ago

I think I've discovered a Ruby bug, possibly introduced in 2.5.

I've attached a reproduction script; running it on Ruby 2.5.0+ (including previews of 2.6.0) seems to always produce a flood of printed `ThreadError: deadlock; recursive locking` exceptions, even though the reproduction code doesn't appear to do any recursive locking.

Running the same script on Ruby 2.4.5 doesn't produce any `ThreadError: deadlock; recursive locking` exceptions. I've run the script several times on Ruby 2.4.5, I simply can't reproduce the raising of `ThreadError: deadlock; recursive locking` with this script on 2.4.5.

Curiously, removing the `puts e.class` on line 24 25 causes the bug to go away: `ThreadError: deadlock; recursive locking` never gets raised regardless of which Ruby version I'm running. Given this oddity, I can't help but think the issue is something around writing to stdout. This change in particular looks suspect: https://bugs.ruby-lang.org/issues/9323

Thank you!
Brock

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