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  1. Bug #1346043
  2. Comment #1

Comment 1 for bug 1346043

Revision history for this message
In , Petr (petr-redhat-bugs) wrote :

Created attachment 730746
Test case

As reported to upstream, there is a possible dead lock when using fork from threads and PerlIO <https://rt.perl.org/rt3/Public/Bug/Display.html?id=106212>.

This has been fixed in commit:

From 4da80956418bbe1fdc23cad0b1cbb24cd7b87609 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Patrik=20H=C3=A4gglund?= <email address hidden>
Date: Sat, 2 Feb 2013 20:21:05 +0100
Subject: [PATCH] PATCH [perl #106212] Add PL_perlio_mutex to
 atfork_lock/unlock

Using threads + fork() on Linux, and IO operations in the threads, the
PL_perlio_mutex may be left in a locked state at the call of fork(),
potentially leading to deadlock in the child process at subsequent IO
operations. (Threads are pre-empted and not continued in the child
process after the fork.)

Therefore, ensure that the PL_perlio_mutex is unlocked in the child
process, right after fork(), by using atfork_lock/unlock.

(The RT text gives ways to reproduce the problem, but are not easily
added to Perl's test suite)

Probably all Fedoras are affected.