linux-kernel - Re: [GIT PULL] dma-mapping updates for Linux 6.12

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Message-ID: <Zu-kCdMau6127_vM@infradead.org>
Date: Sat, 21 Sep 2024 21:58:49 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Xi Ruoyao <xry111@...111.site>
Cc: Christoph Hellwig <hch@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, iommu@...ts.linux.dev
Subject: Re: [GIT PULL] dma-mapping updates for Linux 6.12

On Sun, Sep 22, 2024 at 01:49:35AM +0800, Xi Ruoyao wrote:
> On Sat, 2024-09-21 at 06:51 -0700, Christoph Hellwig wrote:
> > On Sat, Sep 21, 2024 at 03:56:11PM +0800, Xi Ruoyao wrote:
> > > because the laptop has no serial output.  And the behavior seems not
> > > deterministic.  I have some transcript of messages I photoed in several
> > > boot attempts though:
> > 
> > Can you send me the photos of the messages?  Probably best offlist
> > as the lists don't like attachments.
> 
> I've got something better: one attempt to boot
> b5c58b2fdc427e7958412ecb2de2804a1f7c1572 succeeded and I got a dmesg
> containing some Oops traces.
> 
> The camera does *not* work.  And when I rebooted the system it hung
> (presumably related to these Oops). 

So that oops actually comes from the sounds code and looks unrelated
to DMA.  I suspect that oops is what caused your crashes and thus
messed up the DMA bisection.  Can you try to boot with CONFIG_SND
disabled and see where the bisection for the video issues lands?

(Sorry that all this is such a mess)