Bug#286756: marked as done (udev gets tmpfs kernel support test wrong)
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Date: Wed, 22 Dec 2004 13:39:16 +1300
From: "John R. McPherson" <jrm+udevbug@wlug.org.nz>
To: submit@bugs.debian.org
Subject: udev gets tmpfs kernel support test wrong
Message-ID: <20041222003916.GA11219@wlug.org.nz>
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Package: udev
Version: 0.048-2
Severity: grave
Justification: renders computer unusable
Debian sarge/x86, custom kernel 2.6.9.
I built a kernel and didn't set CONFIG_TMPFS, and after installing the
kernel and rebooting, udev mounts an unusable tmpfs over /dev, so
no device files are accessible. The mount doesn't fail, but the
directory is unusable.
If I use 'strace', any accesses to files or dirs in "/dev" return ENODIR.
The init process complains that it can't mount filesystems and only
single-user login prompt is available.
Changing this kernel option and recompiling/installed fixed it.
The problem seems to be that the kernel lists "tmpfs" in
/proc/filesystems even if CONFIG_TMPFS is not set, and /etc/init.d/udev
tests for that to assume tmpfs can be used.
As seen in /usr/src/linux/Documentation/filesystems/tmpfs.txt:
1) There is always a kernel internal mount which you will not see at
all. This is used for shared anonymous mappings and SYSV shared
memory.
This mount does not depend on CONFIG_TMPFS. If CONFIG_TMPFS is not
set, the user visible part of tmpfs is not build. But the internal
mechanisms are always present.
So maybe the kernel will list tmpfs in /proc/filesystems if other
options are set, even if tmpfs ramdisks are not available?
I can provide a kernel config if more information is required.
John McPherson
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for 286756-done@bugs.debian.org; Wed, 11 Jan 2006 11:43:22 +0100
Date: Wed, 11 Jan 2006 11:43:22 +0100
From: maximilian attems <maks@sternwelten.at>
To: 286756-done@bugs.debian.org
Subject: Re: Bug#286756: udev gets tmpfs kernel support test wrong
Message-ID: <20060111104322.GI7691@nancy>
References: <[🔎] 200601022136.24282@zion.black.co.at> <[🔎] 20060103035250.GA32695@wlug.org.nz>
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Version: linux-image-2.6.15
On Tue, 03 Jan 2006, John R. McPherson wrote:
> On Mon, Jan 02, 2006 at 09:36:23PM +0100, David Schmitt wrote:
> > Hi John!
> >
> > Could you please retest with a current kernel (testing:2.6.12,
> > unstable:2.6.14) and a current udev (>= 0.076)?
>
> Hi,
> I thought this was fixed some time ago... the /etc/init.d/udev
> script now checks if files can successfully be created in the tmpfs
> /dev dir:
>
> # using ln to test if /dev works, because touch is in /usr/bin/
> if ln -s test /dev/test-file; then
> rm /dev/test-file
> log_end_msg 0
> else
> log_failure_msg "FATAL: udev requires tmpfs support, not started."
> umount /etc/udev
> umount /dev
> log_end_msg 1
> exit 1
> fi
>
> (This is from udev version 0.060-1ubuntu1, I'm not sure which version
> in debian fixed it).
ok cool.
> The problem only occurred if someone was using a kernel that they compiled
> themselves, since the debian provided kernels had the required support.
well then he gains some experience about badly chosen .configs ;)
> So it's fixed for udev, at least. I thought it had been re-assigned to
> linux-2.6 because someone thought the bug was for listing tmpfs in
> /proc/filesystems when tmpfs wasn't available.
egrep tmpfs /proc/filesystems
nodev tmpfs
closing therefor
--
maks
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