Public bug reported:
1. Problem:
PHP (8.5.3) started giving me this warning:
"Allocation of JIT memory failed, PCRE JIT will be disabled"
This message arises from any call to preg_match().
2. Root cause:
This is caused by the MemoryDenyWriteExecute=yes option being turned on
in the Apache systemd service file.
The bug occurs in Resolute, and it did not occur in 25.04 (I never had a
25.10 instance to test).
3. Solution:
sudo systemctl edit apache2
add the lines
[Service]
MemoryDenyWriteExecute=no
sudo service apache2 restart
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: apache2 2.4.66-2ubuntu1
ProcVersionSignature: Ubuntu 6.19.0-9.9-generic 6.19.5
Uname: Linux 6.19.0-9-generic x86_64
Apache2ConfdDirListing: False
Apache2Modules:
AH00558: apache2: Could not reliably determine the server's fully qualified
domain name, using 127.0.1.1. Set the 'ServerName' directive globally to
suppress this message
httpd (pid 396646) already running
ApportVersion: 2.33.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: MATE
Date: Sun Mar 15 01:29:41 2026
InstallationDate: Installed on 2024-04-29 (684 days ago)
InstallationMedia: Ubuntu-MATE 24.04 LTS "Noble Numbat" - Release amd64
(20240424)
SourcePackage: apache2
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.apache2.sites-available.000-default.conf: [modified]
mtime.conffile..etc.apache2.sites-available.000-default.conf:
2024-06-13T23:07:58.764283
** Affects: apache2 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug jit pcre resolute systemd
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https://bugs.launchpad.net/bugs/2144455
Title:
Apache's systemd option "MemoryDenyWriteExecute" breaks PHP JIT
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