Description:
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I use php-fpm 7.3.25 .  For each user php-fpm.ini contains chroot= .  After I upgraded glbc 2.32 → 2.33 php started crashing like crazy, creating core dumps until it filled my entire disk.  I have not investigated the core dumps.  However, after the 2.32 → 2.33 upgrade openldap (which also runs in chroot) also stopped working.  Investigating the cause lead to the conclusion, that since glibc 2.33 chrooted programmes must first initiate NSS and then switch in the chrooted environment, as within the chrooted environment NSS cannot be initialized:

https://sourceware.org/bugzilla/show_bug.cgi?id=27077

In my particular example I had long time ago nscd long time ago running, then I disabled it and the system worked fine this way for many years.  Since the upgrade to glibc 2.33 I must run ncsd again and bind-mount /var/nscd/socket in the chroot(2)ed environment.  This makes php-fpm working again fine.

As outlined in the above PR, since glibc 2.33 NSS must be initialized before switching to chroot.  Please adjust php-fpm accordingly.