linux-kernel - Re: WARNING: CPU: 12 PID: 44394 at arch/powerpc/kernel/process.c:437 giveup

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Message-ID: <aDfsemssEVATfP80@linux.ibm.com>
Date: Thu, 29 May 2025 10:41:22 +0530
From: Srikar Dronamraju <srikar@...ux.ibm.com>
To: Erhard Furtner <erhard_f@...lbox.org>
Cc: linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: WARNING: CPU: 12 PID: 44394 at arch/powerpc/kernel/process.c:437
 giveup_all+0x90/0x1d0 (v6.14.8, Talos II)

* Erhard Furtner <erhard_f@...lbox.org> [2025-05-27 20:47:28]:

> On Tue, 27 May 2025 14:19:13 +0530
> Srikar Dronamraju <srikar@...ux.ibm.com> wrote:
> 
> > > Getting these from time to time when I run the machine for longer periods building:
> > > 
> > > [...]
> > > ------------[ cut here ]------------
> > > WARNING: CPU: 12 PID: 44394 at arch/powerpc/kernel/process.c:437 giveup_all+0x90/0x1d0  
> > 
> > Its a warning with says that the task's userspace MSR register has
> > VSX set but not the VEC or FP.
> > 
> > Were you building the kernel or were you building something else.
> > Can you paste the command you attempted?
> 
> I was doing an 'emerge -e @world' in Gentoo Linux and probably building a kernel in another shell. Noticed it only in the logs on the next day so I can't tell exactly which command triggered the issue.
> 
> But I will pay closer attention from now on.
> 
> > If this is happening with only the recent kernel and working with a previous
> > kernel, do you happen to know the previous kernel version.
> > In which case, is there a possibility of doing a git bisect?
> 
> I think I have not seen this in v6.13, certainly not in v6.12.
> 

I did go through the git log from v6.12 till v6.15-rc7 and I dont see any
direct changes that could affect VSX VEC or FP changes in kernel.

On a side note, Was there any significant userspace updates like library,
compiler updates from when you saw it working to now?

-- 
Thanks and Regards
Srikar Dronamraju