Uknown error during pdf export

[denisdal]

Describe the bug
Hi all, during pdf export of a book with many pages (177 in my example) the process exit with an error

Steps To Reproduce
Steps to reproduce the behavior:

1. Go to the desired book
2. Click on PDF Export
3. wait
4. See error

Expected behavior
prompt pdf download/open

Screenshots

Your Configuration (please complete the following information):

• Exact BookStack Version (Found in settings): v0.25.5
• PHP Version: PHP 7.2.19-0ubuntu0.18.04.2
• Hosting Method (Nginx/Apache/Docker): Apache2

Additional context
I tried:

• switch to wkhtmltopdf (https://www.bookstackapp.com/docs/admin/pdf-rendering/) with no results. Same error but I see that wkhtmltopdf was called.
• Increase php memory_limit and max_execution_time

With a small book (< 10 pages) pdf export is fine.
Any suggestions ?

[over-soul]

What did you change memory limit and execution time to?

After you made the changes, did you run:

sudo systemctl restart php7.2.19-fpm.service

[denisdal]

memory_limit = 256M
max_execution_time = 300

I restarted apache2 service directly as works in prefork not via FPM

[over-soul]

When you check phpinfo do you see the right limit and execution time?

[denisdal]

Yes

[over-soul]

which version of wkhtmltopdf do you have?

[denisdal]

root@usermanual:~# wkhtmltopdf -V
wkhtmltopdf 0.12.5 (with patched qt)

[over-soul]

What happens if you un-restrict the execution time by entering it as -1? Does it work then?
Also, are your pages primarily made up of text?

Also, how much ram does your server have?

[denisdal]

Tried with max_execution_time = 0 and -1 and there are same error:
[Fri Aug 30 09:26:41.881842 2019] [php7:error] [pid 13038] [client 10.10.1.5:43413] PHP Fatal error: Maximum execution time of 0 seconds exceeded in /var/www/html/bookstack/vendor/symfony/polyfill-mbstring/Mbstring.php on line 500
Fatal error: Maximum execution time of -1+2 seconds exceeded (terminated) in /var/www/html/bookstack/vendor/symfony/polyfill-mbstring/Mbstring.php on line 500

Pages is primarily text but there are also images, not in all pages but they may have it.
Server with 1 GB RAM.

Thank you

[ssddanbrown]

@denisdal When you set max_execution_time to 300 was the browse loading for 5 minutes and did you see 300 in the resulting error log or were the experience/logged times different?

[denisdal]

Well, no.
Browser return unknown error way before then 300 seconds.

[denisdal]

Any help figuring out how to solve this ?
Thanks

[denisdal]

Any update ?