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I am running LAMP in VBox6.1 with Ubnutu Server 20.04.

Cause
This morning I removed all attachments to my vdi (optical disk & shared folders) and then used vboxmanage to --compact my vdi as recommended. (Compacting may be the cause of the problem or a bad php update.)

Problem
In any case, after reattaching my shared folders and rebooting my vdi, I was greeted by

● php8.0-fpm.service loaded failed failed The PHP 8.0 FastCGI Process Manager
...
Starting The PHP 8.0 FastCGI Process Manager...
php-fpm8.0[5192]: [15-Jan-2023 07:41:57] NOTICE: PHP message: PHP Warning:  PHP Startup: Unable to load dynamic library 'apcu.so' (tried: /usr/lib/php/20200930/apcu.so (/usr/lib/php/20200930/apcu.so: cannot open shared object file: No such file or directory), /usr/lib/php/20200930/apcu.so.so (/usr/lib/php/20200930/apcu.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
php-fpm8.0[5192]: [15-Jan-2023 07:41:57] NOTICE: PHP message: PHP Warning:  PHP Startup: Unable to load dynamic library 'redis.so' (tried: /usr/lib/php/20200930/redis.so (/usr/lib/php/20200930/redis.so: cannot open shared object file: No such file or directory), /usr/lib/php/20200930/redis.so.so (/usr/lib/php/20200930/redis.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
php-fpm8.0[5192]: Sun Jan 15 07:41:57 2023 (5192): Fatal Error Insufficient shared memory!
php8.0-fpm.service: Main process exited, code=exited, status=254/n/a
php8.0-fpm.service: Failed with result 'exit-code'.
ystemd[1]: Failed to start The PHP 8.0 FastCGI Process Manager.
....

Troubleshooting
I figured a bad php update knocked out apcu and redis so I ran: apt install --reinstall php8.0-apcu && apt install --reinstall php8.0-redis and this solved two parts of my problem.

However, I am currently stuck with this error:

● php8.0-fpm.service loaded failed failed The PHP 8.0 FastCGI Process Manager
...
Starting The PHP 8.0 FastCGI Process Manager...
php-fpm8.0[4226]: Sun Jan 15 08:39:51 2023 (4226): Fatal Error Insufficient shared memory!
php8.0-fpm.service: Main process exited, code=exited, status=254/n/a
php8.0-fpm.service: Failed with result 'exit-code'.
Failed to start The PHP 8.0 FastCGI Process Manager.
...

Useful Info

  • All other versions of php-fpm are working correctly
  • Attempting to reinstall php8.0-fpm results i the same problem
  • The are zero limits on my shared memory:
  • # sysctl -a | grep kernel.shm
    kernel.shm_next_id = -1
    kernel.shm_rmid_forced = 0
    kernel.shmall = 18446744073692774399
    kernel.shmmax = 18446744073692774399
    kernel.shmmni = 4096
    
  • I booted from LiveCD and ran e2fsck -cfyv /dev/mapper/vgubuntu-vg (no errors)
  • The php8.0 php.ini confirms that shared memory is configured properly:
    root@test:~# php8.0 -i | grep -i sysvshm
    /etc/php/8.0/cli/conf.d/20-sysvshm.ini,
    sysvshm
    sysvshm support => enabled
    root@test:~# php8.0 -i | grep -i sysvsem
    /etc/php/8.0/cli/conf.d/20-sysvsem.ini,
    sysvsem
    sysvsem support => enabled
    root@test:~# php8.0 -i | grep -i sysvmsg
    /etc/php/8.0/cli/conf.d/20-sysvmsg.ini,
    sysvmsg
    sysvmsg support => enabled
    root@test:~# php8.0 -i | grep -i shmop
    /etc/php/8.0/cli/conf.d/20-shmop.ini,
    shmop
    shmop support => enabled
    

I also considered that maybe another application was consuming allof the shared memory and causing php8.0-fpm to fail... not the case:

# ipcs -m --human

------ Shared Memory Segments --------
key        shmid      owner      perms      size       nattch     status      
0x64000630 4          root       600          1.1M     4                     

So at this point, I am stumped. 🤔🤔🤔

Question:
How do I get php8.0-fpm-running again?

1
  • Solution: apt remove --purge php8.0* && apt install php8.0
    – nightwatch
    Jan 15, 2023 at 12:14

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