[ZBX-2252] server crashes on telnet checks Created: 2010 Apr 01  Updated: 2017 May 30  Resolved: 2010 Apr 06

Status: Closed
Project: ZABBIX BUGS AND ISSUES
Component/s: Server (S)
Affects Version/s: 1.8.2
Fix Version/s: 1.8.3, 1.9.0 (alpha)

Type: Incident report Priority: Major
Reporter: Aleksandrs Saveljevs Assignee: Unassigned
Resolution: Fixed Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Attachments: File zabbix_server.telnet.log.gz    
Issue Links:
Duplicate

 Description   

The easiest way to reproduce is to create a telnet check that executes: echo -n '$ '.

With this item, server dies immediately:

22109:20100401:122531.335 In get_value() key:'telnet.run[uname]'
22109:20100401:122531.335 In telnet_run()
22109:20100401:122531.339 In telnet_login()
...
22109:20100401:122532.263 End of telnet_login():SUCCEED
22109:20100401:122532.263 In telnet_execute()
22109:20100401:122532.263 In telnet_read()
22109:20100401:122532.363 End of telnet_read():0
22109:20100401:122532.363 telnet_execute() command output:'$ '
22102:20100401:122532.363 One child process died (PID:22109). Exiting ...

Other related issues were also discovered, like telnet check going into an infinite loop.

 Comments   
Comment by Alexander Vladishev [ 2010 Apr 01 ]

100% CPU usage when processing Telnet checks.

Comment by Aleksandrs Saveljevs [ 2010 Apr 07 ]

Fixed in pre-1.8.3 in r11361.

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