Re: _msgbufp vs msgbufp in the kernel - no symbols for dmesg -N ?

Reply: Marcin Cieslak : "Re: _msgbufp vs msgbufp in the kernel - no symbols for dmesg -N ?"
In reply to: Marcin Cieslak : "_msgbufp vs msgbufp in the kernel - no symbols for dmesg -N ?"
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From: Navdeep Parhar <nparhar_at_gmail.com>
Date: Wed, 09 Sep 2026 16:17:18 UTC

On 9/9/26 5:56 AM, Marcin Cieslak wrote:
> I have noticed that most of the tools like dmesg, vmcore, ps
> do not seem to work on my amd64 minidump kernel core dumps anymore.
> 
> I noticed that those tools expect C-mangled symbol names ("_msgbufp")
> but they are simply not available:
> 
>> dmesg -N /boot/kernel/kernel -M /big/crash/ieee80211_sta_join/vmcore.7
> dmesg: /boot/kernel/kernel: msgbufp not found
> 
> (the message is misleading, dmesg looks for _msgbufp)
> 
>> nm /boot/kernel/kernel |grep msgbufp 
> ffffffff8210b1d0 B msgbufp

What exact revision of main is this?  Do you have cdfc673811ac?

Regards,
Navdeep