From mboxrd@z Thu Jan  1 00:00:00 1970
From: Hai Zaar <haizaar@gmail.com>
Date: Tue, 31 Jan 2006 12:29:39 +0000
Subject: udevd "got lost" after moving /dev
Message-Id: <cfb54190601310429n35d835afi10c445627b168444@mail.gmail.com>
List-Id: <linux-hotplug.vger.kernel.org>
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To: linux-hotplug@vger.kernel.org

In initramfs I run udevd and populate /dev.
Then I mount new root to $NEWROOT.
Then I do the following:
            cd $NEWROOT
            udevcontrol stop_exec_queue
            mount -n --move /dev ./dev
            mount -n --move / .
            chroot /sbin/init >/dev/console </dev/console

In initramfs I have only storage-related modules. So some of the
events have failed. So in bootscripts, instead of triggering all of
the events again, I just want to:
            udevcontrols start_exec_queue
and then replay failed events. This would complete the coldplugging.

The problem is that after --move'ing and chrooting, udev behaves very
strange. It looks like it do not see the rules or something like that.
For example when I plug USB disk (logs are in the end of the message).
If I restart udevd somewhere in bootscripts, everythings works fine.

Is there something inconsistent in my setup?

udev logs (when I plug USB disk):
--------------------------------
1138709838 udevd[331] : udev_event_run: seq 577 forked, pid [2056],
'add' 'usb', 0 seconds old
1138709838 udevd[331] : udev_done: seq 577, pid [2056] exit with 0, 0
seconds old
1138709838 udevd[331] : udev_event_run: seq 578 forked, pid [2057],
'add' 'usb', 0 seconds old
1138709838 udevd[331] : udev_done: seq 578, pid [2057] exit with 0, 0
seconds old
1138709838 udevd[331] : udev_event_run: seq 579 forked, pid [2058],
'add' 'usb_device', 0 seconds old
1138709838 udevd[331] : udev_done: seq 579, pid [2058] exit with 0, 0
seconds old

udevmonitor output (when I plug USB disk):
-------------------------------------------
UEVENT[1138709934.391279] add@/devices/pci0000:00/0000:00:1d.7/usb1/1-8
ACTION=ADd
DEVPATH=3D/devices/pci0000:00/0000:00:1d.7/usb1/1-8
SUBSYSTEM=3Dusb
SEQNUMX3
PHYSDEVBUS=3Dusb
PHYSDEVDRIVER=3Dusb

UEVENT[1138709934.391438] add@/devices/pci0000:00/0000:00:1d.7/usb1/1-8/1-8=
:1.0
ACTION=ADd
DEVPATH=3D/devices/pci0000:00/0000:00:1d.7/usb1/1-8/1-8:1.0
SUBSYSTEM=3Dusb
SEQNUMX4
PHYSDEVBUS=3Dusb
DEVICE=3D/proc/bus/usb/001/007
PRODUCT=1058/701/240
TYPE=3D0/0/0
INTERFACE=3D8/6/80
MODALIAS=3Dusb:v1058p0701d0240dc00dsc00dp00ic08isc06ip50

UEVENT[1138709934.391488] add@/class/usb_device/usbdev1.7
ACTION=ADd
DEVPATH=3D/class/usb_device/usbdev1.7
SUBSYSTEM=3Dusb_device
SEQNUMX5
PHYSDEVPATH=3D/devices/pci0000:00/0000:00:1d.7/usb1/1-8
PHYSDEVBUS=3Dusb
PHYSDEVDRIVER=3Dusb
MAJOR=189
MINOR=3D6

--
Zaar


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