Re: Runaway loop with the current git. [LWN.net]

From:		"Kay Sievers" <kay.sievers-AT-vrfy.org>
To:		"Evgeniy Polyakov" <zbr-AT-ioremap.net>
Subject:		Re: Runaway loop with the current git.
Date:		Sun, 7 Dec 2008 04:56:04 +0100
Message-ID:		<ac3eb2510812061956g6bb422d9r7c8032fb68552b4c@mail.gmail.com>
Cc:		"Alan Cox" <alan-AT-lxorguk.ukuu.org.uk>, linux-kernel-AT-vger.kernel.org
Archive‑link:		Article

On Sat, Dec 6, 2008 at 21:26, Evgeniy Polyakov <zbr@ioremap.net> wrote:
> On Sat, Dec 06, 2008 at 08:32:06PM +0100, Kay Sievers (kay.sievers@vrfy.org) wrote:
>> I don't know if it may have any bad side-effects. It moves the tty
>> registration earlier, before we do pci, framebuffer, video, acpi
>> registration.
>>
>> It boots fine here with and without initramfs.
>>
>> Maybe it makes the "dead" /dev/console in your initramfs working, then
>> we at least know the problem.
>
> I will try this patch this Monday and report back the results.

I was able to reproduce it with the .config you attached, and running it in kvm.

It is caused by:
  "modprobe cryptomgr" called from swapper[1]

This modprobe process does try to log an error, accesses /dev/console,
which is not initialized in the kernel at that time, and the kernel
module loader tries the load a module to support dev_t 5:1, which
again runs modprobe, and ...

Setting CONFIG_CRYPTO_MANAGER=y makes it disapper. The patch I sent
seems to fix it.

The bug is handled here: http://bugzilla.kernel.org/show_bug.cgi?id=12153

Thanks,
Kay