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Currently we belch some output to stderr but fail to abort, resulting in a busy loop. Fixes #15292. Test Plan: * Validate * try running program under environment without timerfd capabilities; ensure we don't busy-loop Reviewers: simonmar, erikd Reviewed By: simonmar Subscribers: rwbarton, thomie, carter GHC Trac Issues: #15929 Differential Revision: https://phabricator.haskell.org/D4875
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