某局点 S6800-54QT 设备WatchDog重启

单台S6800交换机

设备运行过程中出现异常重启，设备发生异常重启，重启原因为WatchDog

1． 查看诊断中kernel exception中

Description 描述字段有received  pcie exception error 子样

display kernel exception 10 verbose slot 1 =============== 

--------------------- Exception record 1 ---------------------

Description           : cpu_0 received a pcie exception error

Recorded at           : 2022-03-21  01:22:27.620672

Occurred at           : 2022-03-21  01:22:27.620672

Instruction address   : 0xffffffffc0ee073c

Thread                : swapper (TID: 0)

Context               : irq context

Slot                  : 1

Cpu                   : 0

VCPU ID               : 0

2． 寄存器中v0 的val= 0x90。。。。寄存器v0的高位是90，也就是0x90开头。

Register content:

Reg:     zero, Val = 0x0000000000000000 ; Reg:       at, Val = 0x0000100000000000 ;

Reg:       v0, Val = 0x9000000010031400 ; Reg:       v1, Val = 0x0000000000031400 ;

Reg:       a0, Val = 0xffffffffc77b9208 ; Reg:       a1, Val = 0x0000000000031400 ;

Reg:       a2, Val = 0xffffffffc0ee0000 ; Reg:       a3, Val = 0x000000000000002c ;

Reg:       t0, Val = 0x00000000000000a0 ; Reg:       t1, Val = 0x0000000000000001 ;

Reg:       t2, Val = 0xffffffff806d99d0 ; Reg:       t3, Val = 0x0000000000005678 ;

Reg:       t4, Val = 0x0000000000031400 ; Reg:       t5, Val = 0x0000000000000000 ;

Reg:       t6, Val = 0x0000000000000000 ; Reg:       t7, Val = 0xc000000002420000 ;

Reg:       s0, Val = 0x0000000000000000 ; Reg:       s1, Val = 0x0000000000031400 ; 

因此确认该问题为版本已知问题PCIE 抖动

问题现象：极低概率设备运行过程中异常重启。

 问题产生条件：pcie链路抖动或信号不稳定 

该问题在R2612P02版本H30 有优化，建议升级到R2612P02H30