linux-kernel - Re: Loading initrd above 4G causes freeze on boot

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Message-ID: <CAE9FiQVXkojPnTr4EQE7h2YhWqa5VBYRSCadB0B1qDL+eGY8jg@mail.gmail.com>
Date:	Sat, 9 Aug 2014 09:44:55 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Mantas Mikulėnas <grawity@...il.com>,
	Matt Fleming <matt.fleming@...el.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-efi@...r.kernel.org
Subject: Re: Loading initrd above 4G causes freeze on boot

On Sat, Aug 9, 2014 at 7:23 AM, Mantas Mikulėnas <grawity@...il.com> wrote:
> As of commit 4bf7111f5016 ("x86/efi: Support initrd loaded above 4G"),
> the kernel freezes at the earliest possible moment when trying to boot
> via UEFI on my Asus laptop. (It still boots via BIOS.)
>
> If I revert that commit on current master (c309bfa9b481), it boots
> correctly again [although I see "setup_efi_pci() failed" being printed].
>
> (Seems like it freezes when handle_cmdline_files() attempts to read
> the last chunk of the initramfs -- the last call to efi_file_read()
> never returns. Figuring out why that happens is beyond me, though.)
>

Matt found that efi_file_read()/firmware has problem that could not do
several reading. Please check if reverting that commit have any
difference.

---
I spent some time playing around with this bug and it appears to be
triggered by the read-a-chunk-at-a-time logic in handle_cmdline_files(),
(which is itself a bug workaround) introduced here,

  commit 2d2da60fb40a
  Author: Maarten Lankhorst <m.b.lankhorst@...il.com>
  Date:   Fri Dec 16 13:30:58 2011 +0100

      x86, efi: Break up large initrd reads
---
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