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SubjectRe: udevd induced deadlock in loading kernel modules?
On Sat, Feb 02, 2008 at 03:21:16AM -0800, Petr Vandrovec wrote:
> Mailer on sf.net says that email address in udev's README is obsolete.
> Oops...
> Petr
>
> -------- Original Message --------
> Subject: udevd induced deadlock in loading kernel modules?
> Date: Sat, 2 Feb 2008 12:07:19 +0100
> From: Petr Vandrovec <petr@vandrovec.name>
> To: linux-kernel@vger.kernel.org
> CC: linux-hotplug-devel@lists.sourceforge.net
>
> Hello,
> today my system hung during boot, while loading ftdi_sio & loop - I have
> two ftdi serial ports,
> and apparently this tricked udevd to start two concurrent modprobes for
> them - so I ended up with
> strance "ftdi_sio: gave up waiting for init of module usbserial." for each
> symbol it tried to
> import, until I kill-9 process 3137 (see below). After that loop got
> loaded, and second ftdi's
> load finished as well.
>
> Unfortunately I do not have stacktraces of hung modprobe processes. Maybe
> next time, but it
> does not look very reproducible.
>
> Kernel is current git (2.6.24, ed50d6cbc394cd0966469d3e249353c9dd1d38b9),
> udev is Debian's 0.114-2,
> and module-init-tools are Debian's 3.3-pre11-4. Kernel is 64bit amd64 with
> almost all debugging
> enabled, userspace is 32bit.

This sounds like a Debian bug in the init process logic. Care to file a
bug in their system for it?

thanks,

greg k-h


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