The "Uninitialized Read Error" message is caused by a transient hardware or software error. This is a Troubleshooting Article for a PFE ASIC Syslog Event. To view other documented syslog events related to XMCHIP, XLCHIP, MQCHIP, LUCHIP, EACHIP, and PECHIP, see KB31893 - Master Index of Articles for Troubleshooting PFE ASIC Syslog Events [juniper.net] . .
When a "Uninitialized Read Error" event occurs messages similar of the following are reported:
Aug 11 08:39:32 router : %PFE-3: fpc5 Uninitialized Read Error @ EDMEM[0x7d1d1bca]
Indications:
No alarm
Traffic impact or PFE wedge may be seen if errors occur repeatedly.
This error is caused by a transient hardware or software defect. PR1032958 fixes false positive double-bit ECC error conditions. Access to unintialized memory with predefined patterns are software errors and the rest are hardware errors. LUCHIP, XLCHIP and EACHIP predifined, scrub, pattern is 0x05B6DB6D6DB6DB6. Therefore, if an uninitialized read error log reports with 0x05B6DB6D6DB6DB6, then this is a software problem.
Perform these steps to determine the cause and resolve the problem (if any). Continue through each step until the problem is resolved.
Collect the show command output.
Capture the output to a file (in case you have to open a technical support case). To do this, configure each SSH client/terminal emulator to log your session.
show log messages show log chassisd start shell network pfe <fpc#> show nvram show syslog messages exit
Analyze the show command output.
In the 'show log messages', review the events that occurred at or just before the appearance of the "Uninitialized Read Error" message. Frequently these events help identify the cause.
No RMA is required
No actions required if errors occur only a few times
If errors are seen repeatedly, collect data with KB31922 - shell script collecting data if packet forwarding at Packet Forwarding Engine is compromised [juniper.net] and FPC restart during a maintenance window. Also, collect debug and ttrace files if any are found in /var/tmp.
Contact your technical support representative with the data collected for further guidance
This article is indexed in KB31893 - Primary Index of Articles for Troubleshooting PFE ASIC Syslog Events [juniper.net] ; tag EACHIPTSG XLCHIPTSG LUCHIPTSG