Reproducing the issue in mantic with the script provided in the SRU test
plan:
+ echo 'Number of SIGSEGV failures:'
Number of SIGSEGV failures:
+ lxc exec php-fpm-segfault -- sh -c 'cat /var/log/php8.2-fpm.log | grep -c
SIGSEGV'
5102
Which confirms the issue.
When tryong to verify the fix, I got the following result:
+ echo 'Number of SIGSEGV failures:'
Number of SIGSEGV failures:
+ lxc exec php-fpm-segfault -- sh -c 'cat /var/log/php8.2-fpm.log | grep -c
SIGSEGV'
315
Further runs with and without the fix are quite consistent: I get
thousands of failures for the package in the release pocket, and a few
hundreds with the package in proposed.
Before marking this as a verification failure, I would like to dig a bit
more to ensure this is not a different bug or a a issue with local
resources.
This is the modified test plan script used to install the packages from
the proposed pocket:
#!/bin/bash
set -eux
trap cleanup EXIT
UBUNTU_SERIES=${UBUNTU_SERIES:-mantic}
PHP_VERSION=${PHP_VERSION:-8.2}
TEST_CONTAINER=php-fpm-segfault
PHP_TEST_FILE=$(mktemp)
PROPOSED_REPO_FILE=$(mktemp)
PROPOSED_PREF=$(mktemp)
cleanup() {
rm -f ${PHP_TEST_FILE}
rm -f ${PROPOSED_REPO_FILE}
rm -f ${PROPOSED_PREF}
lxc delete -f ${TEST_CONTAINER}
}
cat > ${PHP_TEST_FILE} <<EOF
testing...
<br/>
<?php
phpinfo();
fpm_get_status();
EOF
cat > ${PROPOSED_REPO_FILE} <<EOF
# Enable Ubuntu proposed archive
deb http://archive.ubuntu.com/ubuntu/ ${UBUNTU_SERIES}-proposed restricted main
multiverse universe
EOF
cat > ${PROPOSED_PREF} <<EOF
# Configure apt to allow selective installs of packages from proposed
Package: *
Pin: release a=${UBUNTU_SERIES}-proposed
Pin-Priority: 500
EOF
lxc launch ubuntu-daily:${UBUNTU_SERIES} ${TEST_CONTAINER}
lxc file push ${PROPOSED_REPO_FILE}
${TEST_CONTAINER}/etc/apt/sources.list.d/ubuntu-${UBUNTU_SERIES}-proposed.list
lxc file push ${PROPOSED_PREF}
${TEST_CONTAINER}/etc/apt/preferences.d/proposed-updates
lxc exec ${TEST_CONTAINER} -- apt update
lxc exec ${TEST_CONTAINER} -- apt install -y php php-fpm apache2-utils apache2
libapache2-mod-fcgid
lxc exec ${TEST_CONTAINER} -- systemctl start php${PHP_VERSION}-fpm
lxc exec ${TEST_CONTAINER} -- a2dismod php${PHP_VERSION}
lxc exec ${TEST_CONTAINER} -- a2dismod mpm_prefork
lxc exec ${TEST_CONTAINER} -- a2enconf php${PHP_VERSION}-fpm
lxc exec ${TEST_CONTAINER} -- a2enmod proxy_fcgi proxy mpm_event
lxc file push ${PHP_TEST_FILE} ${TEST_CONTAINER}/var/www/html/test.php --mode
0644
lxc exec ${TEST_CONTAINER} -- systemctl restart apache2.service
lxc exec ${TEST_CONTAINER} -- sh -c "curl -s localhost/test.php | grep -o
'FPM/FastCGI'"
lxc exec ${TEST_CONTAINER} -- ab -n 10000 -c 99 http://localhost/test.php
echo 'Number of SIGSEGV failures:'
lxc exec ${TEST_CONTAINER} -- sh -c "cat /var/log/php${PHP_VERSION}-fpm.log |
grep -c SIGSEGV"
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https://bugs.launchpad.net/bugs/2057576
Title:
php-fpm sometimes SIGSEGVs (signal 11) when running fpm_get_status
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https://bugs.launchpad.net/ubuntu/+source/php7.4/+bug/2057576/+subscriptions
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