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We see sequences like:
UEVENT[1176966403.907336] add@/block/dasda
UDEV [1176966403.920359] add@/block/dasda
UEVENT[1176966403.964379] add@/block/dasda/dasda1
UEVENT[1176966403.964438] add@/block/dasda/dasda2
UEVENT[1176966403.964483] online@/block/dasda
UEVENT[1176966403.964519] online@/block/dasda/dasda1
UEVENT[1176966403.964555] online@/block/dasda/dasda2
UDEV [1176966403.967413] add@/block/dasda/dasda1
UDEV [1176966403.968719] add@/block/dasda/dasda2
UDEV [1176966403.974750] online@/block/dasda/dasda1
UDEV [1176966403.982241] online@/block/dasda/dasda2
UDEV [1176966403.999847] online@/block/dasda
where the event for the disk (last event) should come before the
events for the partitons. We skipped events for dependency reasons,
but the dependency check for later events did not see the skipped
events.
It occurs, when root-partition has no /dev/console, meaning that kernel
could not open it, and such udevd is started without open filedescriptors
0 1 2. In that case udevd openes its sockets (netlink and control). They
get fds between 0 and 2. Later duping /dev/null to 0 1 2 closes the sockets
and replaces them with /dev/null.
The error condition can also be reproduced by starting udevd with this
command-line:
udevd --daemon <&- >&- 2>&-
For renamed network interfaces, the udev socket message header
contained the original devpath, which we have updated in the
environment after the kernel has silently renamed the netif.
Identified by Joachim Plack <jplack@suse.de> while working around
the problem that the device nodes appear and disappear while the
partitiontable is re-read and the application need to waait for an
empty udevd queue.