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

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Date:   Fri, 30 Dec 2022 12:50:06 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Zeno Davatz <zdavatz@...il.com>
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bruno Moreira-Guedes <brunodout.dev@...il.com>
Subject: Re: [Bug 216859] New: PCI bridge to bus boot hang at enumeration

[+cc Bruno, to include you here as well as the bugzilla]

On Wed, Dec 28, 2022 at 12:42:34PM -0600, Bjorn Helgaas wrote:
> On Wed, Dec 28, 2022 at 06:42:38PM +0100, Zeno Davatz wrote:
> > On Wed, Dec 28, 2022 at 1:02 PM Bjorn Helgaas <helgaas@...nel.org> wrote:
> > > 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.
> 
> Sounds good, thanks!
> 
> > > 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.
> 
> OK.  We'll figure it out!
> 
> Bjorn