Description

ACX7024 doesn't boot while rebooted after "request system zeroize".
this is a bug.

Symptoms

ACX7024 doesn't boot when rebooted after request system zeroize.

Router land to the state from where they can only recover with USB upgrade.

DEVICE MODEL:- ACX7024

Version affected:- 22.4-R2-EVO 
R2> request system zeroize 
warning: System will be rebooted and may not boot without configuration
warning: RE nodes will be rebooted and may become unreachable over the network until re-configuration
Erase all data, including configuration and log files? [yes,no] (no) yes 

warning: zeroizing... 


BIOS Reset Reason: iTCO WDT

Primary BIOS version CDEN_P_EX1_00.19.01.00

Total Memory Size = 16GB

Checking Primary BIOS code integrity...Passed!
Press Esc for boot options
ME is in normal operational state

Booting ETH00 (2C-4C-15-61-13-FF) ...

Secure boot is enforced

>>Start PXE over IPv4, Press [ESC] to EXIT...
  PXE-E18: Server response timeout.

Press Esc for boot options

Press Esc for boot options

Booting ETH00 (2C-4C-15-61-13-FF) ...

Secure boot is enforced

>>Start PXE over IPv4, Press [ESC] to

Solution

This is BUG and fixed through PR.

external content of the PR is available on below link.

https://prsearch.juniper.net/problemreport/PR1740989

RCA:- 
zeroize does secure erase of disk on available platforms. However, few platforms do not support secure erase and hence "dd" is used to erase contents of disk. In ACX based platforms, "dd" of 40GiB disk was taking more time which raised watchdog timeout  resulting in kernel panic. The solution was to reset watchdog timer to 500s just before "dd" procedure starts

Please be informed that you have contact JTAC or raise a case incase you need to get releases on which fix are available

 

Modification History

2023-11-23 : Article Created