Description

This article describes a scenario in which an EX2200 reboots unexpectedly, displaying the console message Triggering overheat circuitry.. and the syslog message Temp sensor EX-PFE1 caused fire shutdown .

Symptoms

EX2200 reboots unexpectedly, with the message Triggering overheat circuitry..  and the syslog message Temp sensor EX-PFE1 caused fire shutdown .

Solution

Due to a bug in reading the temperature from the EX2200, it may unexpectedly reboot. This issue occurs around or under 0 degrees Celsius. It does not occur with other EX platforms.

The following output is taken from the console: 

set interfaces me0 unit 0 family inet
set interfaces vlan unit 0 family inet
set protocols igmp-snooping vlan all
set protocols rstp
set protocols lldp interface all
set protocols lldp-med interface all
---(more 95%)---Jun 26 21:37:17 init: event-processing (PID 628) exited with sta
tus=1
Jun 26 21:37:17 init: event-processing (PID 1267) started
Waiting (max 300 seconds) for system process `vnlru' to stop...done
Waiting (max 300 seconds) for system process `vnlru_mem' to stop...done
Waiting (max 300 seconds) for system process `bufdaemon' to stop...done
Waiting (max 300 seconds) for system process `syncer' to stop...
Syncing disks, vnodes remaining...3 5 5 JJJJJJJJJJJJJJJJJJJJ3 JJJJJJJ
Amnesiac (ttyu0)

login: Jun 26 21:37:23 init: sntp (PID 878) exited with status=0 Normal Exit
Jun 26 21:37:23 init: inet-process (PID 877) exited with status=0 Normal Exit
Jun 26 21:37:23 init: management (PID 874) exited with status=0 Normal Exit
Jun 26 21:37:23 init: craft-control (PID 873) exited with status=0 Normal Exit
Jun 26 21:37:23 init: alarm-control (PID 872) exited with status=0 Normal Exit
Jun 26 21:37:23 init: tnp-process (PID 869) exited with status=0 Normal Exit
Jun 26 21:37:23 init: watchdog (PID 868) exited with status=0 Normal Exit
3 2 1 1 0 0 0 done

syncing disks... All buffers synced.
Uptime: 5m5s
Triggering overheat circuitry...

The following output is taken from the syslog:

 
Nov 15 18:35:42 SPHC-ZJF-EX22-239 mib2d[984]: SNMP_TRAP_LINK_DOWN: ifIndex 536, ifAdminStatus up(1), ifOperStatus down(2), ifName ge-0/0/20
Nov 15 18:35:43 SPHC-ZJF-EX22-239 chassism[955]: System shutting down... Temp sensor EX-PFE1 caused fire shutdown
Nov 15 18:35:43 SPHC-ZJF-EX22-239 eventd: exiting on signal 15
Nov 15 18:35:43 EX2200 eventd[1004]: SYSTEM_ABNORMAL_SHUTDOWN: System abnormally shut down
Nov 15 18:35:43 EX2200 eventd[1004]: SYSTEM_OPERATIONAL: System is operational
Nov 15 18:35:44 EX2200 fpc0 MRVL-L2:mrvl_fdb_mac_entry_uc_set(),966:FDb SP HW-overwrite failed(3) for VLANIdx=5:24:be:05:11:9d:32/48:IFL=93
Nov 15 18:38:07 EX2200 eventd[701]: SYSTEM_ABNORMAL_SHUTDOWN: System abnormally shut down
Nov 15 18:38:07 EX22-239 eventd[701]: SYSTEM_OPERATIONAL: System is operational
Nov 15 18:38:07 EX2200 /kernel: GDB: debug ports: uart
Nov 15 18:38:07 EX2200 /kernel: GDB: current port: uart
Nov 15 18:38:07 EX2200 /kernel: KDB: debugger backends: ddb gdb
Nov 15 18:38:07 EX2200 /kernel: KDB: current backend: ddb

This issue has been fixed in 11.1R4, 11.2R2, 11.3R1, 11.4R7 and later Junos versions.


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