(500) Cannot save settings after upgrading from 5.8 to 5.9.2

[chr1st0ph9]

Hello,
was running 5.8.x since a while and wanted to run the last version 5.9.2
_from the GUI disable "cron" and set on the maintenance mode
_ran the CLI php upgrade command (no error)
_can access flawlessly to espocrm but ... unable to switch back the maintenance mode and cron !
Espo log shown:
[2020-06-12 19:48:17] Espo.ERROR: (500) Cannot save settings; PUT /espocrm/api/v1/Settings; line: 209, file: /var/www/html/espocrm/application/Espo/Services/Settings.php [] []

cleared cache by cli command
rebuitd database by cli command
check index.php access right
did not found anything, any help will be grandly appreciated

have a goot week end
Christophe

[chr1st0ph9]

I forgot to mention that:
_I installed also the last ubuntu 18 updates (so perhaps this has nothing to do with espocrm)
_Machine was rebooted but this did not improve anything
_all settings in the administration section are concerned (changes cannot be saved)

[chr1st0ph9]

Reading the log deeper, gave this information
[2020-06-12 19:32:03] Espo.WARNING: E_WARNING: rename(data/config.php): failed to open stream: Permission denied {"code":2,"message":"rename(data/config.php): failed to open stream: Permission denied"

looking into the data directory
drwxrwxr-x 3 www-data www-data 4096 Jun 12 22:08 cache
-rw-rw-r-- 1 root root 7487 Jun 12 21:52 config.php <<< ????????

Changing the access right for config.php like following
-rw-rw-r-- 1 www-data www-data 7489 Jun 12 22:42 config.php
solved the problem :-)

if anybody has an idea why/how a permission problem appeared with the config.php file, I would be glad to have it ...
Best Regards,
Christophe

[yuri]

It seems that during upgrade, an owner for config.php was changed to root. It should not happen, Espo should change owner to www-data if everything is configured right. Not sure why it didn't work for you.

As a workaround, for the next time, you can run upgrade under www-data user.

[chr1st0ph9]

Merci Yuri for your answer!
I had a look into the last backup before upgrade, the data/config.php was already owned by root but with 666 permissions.
Meilleures salutations,
Christophe