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boolightning

Member

Registered: 2025-10-25

Posts: 15

[SOLVED] what is at address ending in 343?

I'm doing regular system maintenance and I read this message in journal:

BUG: kernel NULL pointer dereference, address: 0000000000000343

What I would like to know:

1. what data is stored by what program at that address
2. what is a kernel pointer in this context? (explanations exist online but I am seeking a better explanation)
3. what does dereference mean in this context?
4. does NULL mean that the value stored here is FALSE?

here is the output of  journalctl -p 1

Nov 01 01:12:38 archlinux kernel: BUG: kernel NULL pointer dereference, address: 0000000000000343
Nov 01 01:12:38 archlinux kernel: #PF: supervisor read access in kernel mode
Nov 01 01:12:38 archlinux kernel: #PF: error_code(0x0000) - not-present page
-- Boot e69388721d174c378c7fb3ae7ad3cfdd --
Nov 03 11:38:49 archlinux kernel: BUG: kernel NULL pointer dereference, address: 0000000000000343
Nov 03 11:38:49 archlinux kernel: #PF: supervisor read access in kernel mode
Nov 03 11:38:49 archlinux kernel: #PF: error_code(0x0000) - not-present page
Nov 03 11:43:53 archlinux kernel: BUG: kernel NULL pointer dereference, address: 0000000000000343
Nov 03 11:43:53 archlinux kernel: #PF: supervisor read access in kernel mode
Nov 03 11:43:53 archlinux kernel: #PF: error_code(0x0000) - not-present page

I'm not posting this for help fixing my pc, I am posting this to ask for the meanings of these words. If there is a better place to ask this please redirect me. If I have made an error in formatting or left out relevant information please let me know.

Last edited by boolightning (2025-11-06 21:12:40)

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 75,086

Re: [SOLVED] what is at address ending in 343?

I'm not posting this for help fixing my pc, I am posting this to ask for the meanings of these words.

https://www.merriam-webster.com
https://en.wikipedia.org/wiki/Pointer_( … ogramming)

There's a bug in some kernel module that results in an (illegal) nullptr deref (the code wants to look at what that pointer points to but the pointer itself is not valid) - the kernel can isolate that, otherwise you'd get a BSOD.
If you want to know what's going on, the contextual lines matter A LOT.
If you want to know what BSOD is, I'm sure google knows that…

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boolightning

Member

Registered: 2025-10-25

Posts: 15

Re: [SOLVED] what is at address ending in 343?

Thank you for your help, that essentially answers my question.