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

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Message-ID: <20221228120248.GA508080@bhelgaas>
Date:   Wed, 28 Dec 2022 06:02:48 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     "Zeno R.R. Davatz" <zdavatz@...il.com>
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [Bug 216859] New: PCI bridge to bus boot hang at enumeration

[+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?

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.

Bjorn