linux-kernel - Log crash to nvsram

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Message-Id: <90A41B49-400C-42FF-9C77-A17032F219D0@gmail.com>
Date:   Fri, 20 Oct 2023 16:32:20 +0530
From:   "Subin C. P." <subincp@...il.com>
To:     linux-kernel@...r.kernel.org
Subject: Log crash to nvsram

Hi,

Apologies if I’m intruding. I got this mail id while reading Documentation/oops-tracing.txt. 

I’m getting below kernel crash. This is logged to serial console. I wanted to write this to a non volatile RAM. I’ve registered to panic _notifier_list, die_notifier _list, cpu_notifier _list, memory _notifier _list, oom_notifier _list. But my callback is not getting called during this crash in order to write this to the nvsram. 
Is this log happening outside kernel? Can’t we get a notification when this crash occurs?

*******************************************************************************************
cpu_4 received a bus/cache error(warning)
*******************************************************************************************
CPU (XLP specific) registers dump: Node=0
    COP2: TxMsgStatus = 0x00000000, MsgStatus1 = 0x0f0f0000
     ICU: log0 = 0x00000000, log1 = 0x00000000, log2 = 0x00000000
     LSU: log0 = 0x00000000, log1 = 0x0000000000000000
     SCU: log0 = 0x00000000, log1 = 0x00000000, log2 = 0x00000000
     TCU: reg0 = 0x00000000, reg1 = 0x00000000, reg2 = 0x00000000
     NBU: reg0 = 0x00000000, reg1 = 0x00000000, reg2 = 0x00000000
  DRAM_A: reg1 = 0x00000000, reg2 = 0x00000000
  DRAM_B: reg1 = 0x00000000, reg2 = 0x00000000
  DRAM_C: reg1 = 0x00000000, reg2 = 0x00000000
  DRAM_D: reg1 = 0x00000000, reg2 = 0x00000000

     CPU: epc = 0x105bc310, errorepc = 0xffffffffc1024270, cacheerr = 0x00000000
*******************************************************************************************
 Unknown Cache error in exception handler!
Can not handle bus/cache error - Halting cpu

Thanks,
Subin.