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Bug #81453 JIT (tracing mode only): Undefined array key
Submitted: 2021-09-17 13:06 UTC Modified: 2021-10-04 08:34 UTC
Avg. Score:4.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: julien dot boudry at gmail dot com Assigned: krakjoe (profile)
Status: Closed Package: JIT
PHP Version: 8.1.0RC2 OS: Windows and Linux
Private report: No CVE-ID: None
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From: julien dot boudry at gmail dot com
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 [2021-09-17 13:06 UTC] julien dot boudry at gmail dot com
Happens only with JIT tracing mode (which is the default): working well in "function" mode, without JIT, and with or without opcache extension.

Impossible (for me) to reproduce in a simple PHP example. But I got the commit when the bug begin, and it's absolutely absurd. I hope that can help.

Test script:
#(ideal with Docker official images)

git clone
cd Condorcet

#(not necessary today)
git checkout 859c71c

# Working fine
php Dev/bugs/JitBug.php
# OR
php -dzend_extension=opcache -dopcache.enable_cli=1 Dev/bugs/JitBug.php
# OR
php -dzend_extension=opcache -dopcache.enable_cli=1 -dopcache.jit_buffer_size=100M -dopcache.jit=function Dev/bugs/JitBug.php
# Failing
php -dzend_extension=opcache -dopcache.enable_cli=1 -dopcache.jit_buffer_size=100M -dopcache.jit=tracing Dev/bugs/JitBug.php

# (the previous commit)
git checkout b3c8df1
# Retry the same commands and everything working fine

Expected result:
No error

Actual result:
Warning: Undefined array key...


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 [2021-09-17 14:52 UTC] julien dot boudry at gmail dot com
(Without any connection or action create this incredible mess with JIT. )
 [2021-10-03 13:43 UTC] julien dot boudry at gmail dot com
Not happening anymore with 8.1.0RC3
 [2021-10-04 08:34 UTC]
-Status: Open +Status: Closed -Assigned To: +Assigned To: krakjoe
 [2021-10-04 08:34 UTC]
Thank you for your bug report. This issue has already been fixed
in the latest released version of PHP, which you can download at

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Last updated: Thu Oct 21 05:03:35 2021 UTC