Zabbix Documentation 4.4

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manual:installation:known_issues

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manual:installation:known_issues [2019/04/18 08:58]
martins-v flipping frontend locales
manual:installation:known_issues [2020/02/18 10:18] (current)
martins-v snmp data spikes
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 If the OpenBSD operating system is used, a use-after-free bug in the Net-SNMP library up to the 5.7.3 version can cause a crash of Zabbix server if the SourceIP parameter is set in the Zabbix server configuration file. As a workaround, please do not set the SourceIP parameter. The same problem applies also for Linux, but it does not cause Zabbix server to stop working. If the OpenBSD operating system is used, a use-after-free bug in the Net-SNMP library up to the 5.7.3 version can cause a crash of Zabbix server if the SourceIP parameter is set in the Zabbix server configuration file. As a workaround, please do not set the SourceIP parameter. The same problem applies also for Linux, but it does not cause Zabbix server to stop working.
 A local patch for the net-snmp package on OpenBSD was applied and will be released with OpenBSD 6.3. A local patch for the net-snmp package on OpenBSD was applied and will be released with OpenBSD 6.3.
 +
 +=== SNMP data spikes ===
 +
 +Spikes in SNMP data have been observed that may be related to certain physical factors like voltage spikes in the mains. See [[https://​support.zabbix.com/​browse/​ZBX-14318|ZBX-14318]] more details.
 +
 +=== Alerter process crash in Centos/RHEL 7 ===
 +
 +Instances of a Zabbix server alerter process crash have been encountered in Centos/RHEL 7. Please see [[https://​support.zabbix.com/​browse/​ZBX-10461|ZBX-10461]] for details.
 +
 +=== Compiling Zabbix agent on HP-UX ===
 +
 +If you install the PCRE library from a popular HP-UX package site http://​hpux.connect.org.uk,​ for example from file ''​pcre-8.42-ia64_64-11.31.depot'',​ you get only the 64-bit version of the library installed in the /​usr/​local/​lib/​hpux64 directory.
 +
 +In this case, for successful agent compilation customized options need to be used for the %%"​%%configure%%"​%% script, e.g.: 
 +
 +  CFLAGS="​+DD64"​ ./configure --enable-agent --with-libpcre-include=/​usr/​local/​include --with-libpcre-lib=/​usr/​local/​lib/​hpux64
  
 === Flipping frontend locales === === Flipping frontend locales ===
  
-It has been observed that frontend locales may flip without apparent logic. A known workaround to this is to disable multithreading in PHP and Apache. ​Please ​see  [[https://​support.zabbix.com/​browse/​ZBX-10911|ZBX-10911]] ​for more information.+It has been observed that frontend locales may flip without apparent logic, ie. some pages (or parts of pages) are displayed in one language while other pages (or parts of pages) in a different language. Typically the problem may appear when there are several users, some of whom use one locale, while others use another. 
 + 
 +A known workaround to this is to disable multithreading in PHP and Apache. 
 + 
 +The problem is related to how setting the locale works [[https://​www.php.net/​manual/​en/​function.setlocale|in PHP]]: locale information is maintained per process, not per thread. So in a multi-thread environment,​ when there are several projects run by same Apache process, it is possible that the locale gets changed in another thread and that changes how data can be processed in the Zabbix thread. 
 + 
 +For more information,​ please ​see related problem reports: 
 + 
 +  [[https://​support.zabbix.com/​browse/​ZBX-10911|ZBX-10911]] ​(Problem with flipping frontend locales) 
 +  * [[https://​support.zabbix.com/​browse/​ZBX-16297|ZBX-16297]] (Problem with number processing in graphs using the ''​bcdiv''​ function of BC Math functions)
  
 === Compatibility issue with PHP 7.0 === === Compatibility issue with PHP 7.0 ===
  
 It has been observed that with PHP 7.0 importing a template with web monitoring triggers may fail due to incorrectly added double quotes to the web monitoring items in the trigger expressions. The issue goes away when upgrading PHP to 7.1. It has been observed that with PHP 7.0 importing a template with web monitoring triggers may fail due to incorrectly added double quotes to the web monitoring items in the trigger expressions. The issue goes away when upgrading PHP to 7.1.
 +
 +=== PHP 7.3 opcache configuration ===
 +
 +If %%"​%%opcache%%"​%% is enabled in the PHP 7.3 configuration,​ Zabbix frontend may show a blank screen when loaded for the first time. This is a registered [[https://​bugs.php.net/​bug.php?​id=78015|PHP bug]]. To work around this, please set the %%"​%%opcache.optimization_level%%"​%% parameter to ''​0x7FFFBFDF''​ in the PHP configuration (php.ini file).
  
 === Graphs === === Graphs ===
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 Maps, in Internet Explorer 11, are cut off on the right side if the map content is larger than the dashboard widget area (instead of being resized proportionately). This is intentional because of an IE11-related issue with proper resizing of SVG images. Maps, in Internet Explorer 11, are cut off on the right side if the map content is larger than the dashboard widget area (instead of being resized proportionately). This is intentional because of an IE11-related issue with proper resizing of SVG images.
 +
 +=== Known issues in 4.4.0 - 4.4.3 ===
 +
 +  * High memory usage has been observed during process startup with SQLite 3.7.17 on Centos/RHEL 7. The startup process has been improved in 4.4.4 to avoid similar issues with other databases as well. See [[https://​support.zabbix.com/​browse/​ZBX-9084|ZBX-9084]] for more details.