[Bug 279226] sort(1) can deadlock with poorly timed signal

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From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 22 May 2024 17:35:13 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=279226

            Bug ID: 279226
           Summary: sort(1) can deadlock with poorly timed signal
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: kevans@freebsd.org

sort(1) has a semapahore to protect the tmp file list, and it catches numerous
signals to trigger tmp cleanup before bailing out.  If we receive a signal
while tmp_files_sem is held, we can easily deadlock sort(1) as the signal
handler tries to take it again.

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