Dear all,

Background : I want to store the printk message checksum in the dict field of structured log entry.

What I tried : I have made a following changes in the printk.c file,

• Calculate the message checksum using crc32_le function in vprintk_emit function
• Append the checksum to the dict field
• update the dict_len
• Compile the source

After the successful compilation, I restarted the machine but it didn't start booting now.. It just got stuck..

So, I'm not sure what went wrong?

Any pointers or help is welcome...

Thanks

It's very hard to say what went wrong. Quite possibly you have a big in your code and this bug crashes the system before it even boots. This is quite probable: printks are used at the boot time.

What you need to do now is to restore the old kernel to be able to boot. Use a live cd or boot with any other spare kernel you have (like the kernel of yur distribution).

Then I recommend you to start making changes one by one, if possible in a virtual machine: it's much easier to fix it. Do not implement everything at once. Just add the field at first, compile, debug. Then add the checksum etc.