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[QFX5100] "dc-pfe: PANIC PANIC PANIC PANIC PANIC PANIC" error after downgrading QFX5100

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Article ID: KB34144 KB Last Updated: 08 May 2019Version: 1.0
Summary:

After downgrading the QFX5100 switch from Junos OS version ​14.1X53-D47.3 to Junos OS 14.1X53-D28.15, the switch may be seen to generate the fxpc core continuously, while reporting PANIC errors on the console. This problem can be seen in stand-alone mode and in virtual-chassis mode of operation.

Note: The errors are seen until the switch is upgraded again to Junos OS release ​​14.1X53-D47.3.

In this article, the cause for the PANIC errors to be reported is given, along with the solution.

 

Symptoms:

The following errors are seen on the console after the software downgrade:

Message from syslogd@Juniper at Mar  2 05:34:31 2019  ...
Juniper dc-pfe: Registers:

Message from syslogd@Juniper at Mar  2 05:34:31 2019  ...
Juniper dc-pfe: eip: 0x08f400c2 eflags: 0x00000246    trapno: 0

Message from syslogd@Juniper at Mar  2 05:34:31 2019  ...
Juniper dc-pfe: eax: 0x00000054    ebx: 0x00000000    ecx: 0x58813f95    edx: 0x00000054

Message from syslogd@Juniper at Mar  2 05:34:31 2019  ...
Juniper dc-pfe: esi: 0x00000000    edi: 0x00000000    esp: 0x217d77b8    ebp: 0x217d77e0

Message from syslogd@Juniper at Mar  2 05:34:31 2019  ...
Juniper dc-pfe: cs: 0x0033 ds: 0x20c3003b es: 0x003b fs: 0x003b gs: 0x001b ss: 0x003b

Message from syslogd@Juniper Mar  2 05:34:31 2019  ...
Juniper dc-pfe: 

Message from syslogd@Juniper at Mar  2 05:34:31 2019  ...
Juniper dc-pfe: PANIC PANIC PANIC PANIC PANIC PANIC

Message from syslogd@Juniper at Mar  2 05:34:31 2019  ...
Juniper dc-pfe: Watchdog fired delta=3 sig_watchdog_counter=10 watchdog_counter=10

Message from syslogd@Juniperat Mar  2 05:34:31 2019  ...
Juniper dc-pfe: Traceback:

Message from syslogd@Juniper at Mar  2 05:34:31 2019  ...
Juniper dc-pfe: Frame 0: sp = 0x217d7418, pc = 0x8048ada

Message from syslogd@Juniper at Mar  2 05:34:31 2019  ...
Juniper dc-pfe: Frame 1: sp = 0x217d7428, pc = 0x806bc5e

Message from syslogd@Juniper at Mar  2 05:34:31 2019  ...
Juniper dc-pfe: Frame 2: sp = 0x217d7448, pc = 0x806bca8
 

The core dump is seen as below:

> show system core-dumps

fpc0:
--------------------------------------------------------------------------
-rw-rw----  1 root  field    3724275 Mar 2  05:33 /var/tmp/fxpc.core.0.gz
-rw-rw----  1 root  field    3737886 Mar 2  05:36 /var/tmp/fxpc.core.1.gz
-rw-rw----  1 root  field    3747609 Mar 2  05:37 /var/tmp/fxpc.core.2.gz
-rw-rw----  1 root  field    3781011 Mar 2  05:38 /var/tmp/fxpc.core.3.gz
-rw-rw----  1 root  field    2261002 Mar 2  06:15 /var/tmp/fxpc.core.4.gz

 

Cause:

This issue is caused when there is a mismatch between the Junos OS host software version and the version that is currently used on the switch.

Hostname: Juniper
Model: qfx5100-96s-8q
Junos: 14.1X53-D28.15
JUNOS Base OS Software Suite [14.1X53-D28.15]
JUNOS Base OS boot [14.1X53-D28.15]
JUNOS Crypto Software Suite [14.1X53-D28.15]
JUNOS Online Documentation [14.1X53-D28.15]
JUNOS Kernel Software Suite [14.1X53-D28.15]
JUNOS Packet Forwarding Engine Support (qfx-ex-x86-32) [14.1X53-D28.15]
JUNOS Routing Software Suite [14.1X53-D28.15]
JUNOS Enterprise Software Suite [14.1X53-D28.15]
JUNOS Web Management Platform Package [14.1X53-D28.15]
JUNOS py-base-i386 [14.1X53-D28.15]
JUNOS Host Software [14.1X53-D47.3]

 

Solution:

To ensure that the Junos OS version and the host software version are the same, use the force-host option while downgrading the switch.

>request system software add  <upgrade image file name and location> force-host

 

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