linux-kernel - Re: [Bug 216859] New: PCI bridge to bus boot hang at enumeration

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Date:   Wed, 28 Dec 2022 18:42:38 +0100
From:   Zeno Davatz <zdavatz@...il.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [Bug 216859] New: PCI bridge to bus boot hang at enumeration

Dear Bjorn

On Wed, Dec 28, 2022 at 1:02 PM Bjorn Helgaas <helgaas@...nel.org> wrote:
>
> [+cc linux-pci, linux-kernel]
>
> On Wed, Dec 28, 2022 at 08:37:52AM +0000, bugzilla-daemon@...nel.org wrote:
> > https://bugzilla.kernel.org/show_bug.cgi?id=216859
>
> >            Summary: PCI bridge to bus boot hang at enumeration
> >     Kernel Version: 6.1-rc1
> > ...
>
> > With Kernel 6.1-rc1 the enumeration process stopped working for me,
> > see attachments.
> >
> > The enumeration works fine with Kernel 6.0 and below.
> >
> > Same problem still exists with v6.1. and v6.2.-rc1
>
> Thank you very much for your report, Zeno!
>
> v6.0 works, v6.1-rc1 fails.  Would you mind booting v6.1-rc1 with the
> "ignore_loglevel initcall_debug" kernel parameters and taking a photo
> when it hangs?

I will try this after Januar 7th 2023.

> How did you conclude that the hang is related to a PCI bridge?  I see
> recent PCI messages in the photo, but it looks like the last message
> is from NFS, so I'm wondering if I'm missing some context.  The v6.0
> dmesg shows several other ntfs, fuse, JFS, etc messages before more
> PCI-related things.  Anyway, the "initcall_debug" might help us narrow
> it down a bit.

I did not really conclude that. I just saw "PCI" as one of the last
messages being outputted before the boot process stopped.

Best
Zeno