Race condition for udev/persistent-net

[Matthias Schwarzott <zzam@gentoo.org>]

Hi there!

I am trying to find out why the persistent-net-rules only work sometimes for 
me (using udev-103-r3 on gentoo).

Steps to reproduce: (All files I use are relative to /etc/udev/rules.d)

1. Make sure 70-persistent-net.rules exists.
If not try reloading network modules
and running udevtrigger.

2. Modify NAME-Part of rules to something not used as default (either 
non "eth", or higher numbers like eth7 ...)

3. udevcontol reload_rules


After these steps one can try wheather the existing rules now get applied 
every time or not by:

4. rmmod and modprobe network module.

5. Verify name by "ifconfig -a|grep Ethernet"

6. If name is wrong executing udevtrigger and recheck.

For me the name was correct in 3 out of 15 tries.


The generated rules look like this for me (after changing NAME):
# PCI device 0x8086:0x1076 (e1000)
SUBSYSTEM="net", DRIVERS="?*", ATTRS{address}="xx:xx:xx:xx:xx:xx", 
NAME="eth8"

It seems that DRIVERS is not always set when trying this rule. Removing it, or 
adding next rule to 05-udev-early.rules helped:
ACTION="add", SUBSYSTEM="net", WAIT_FOR_SYSFS="device/driver"


But the problem with this rule is: udev now waits also for a driver entry for 
loopback/bridge devices. This gives ugly log/console output.

Is there a better place to put such a wait-rule?



It is also possible to just skip the DRIVERS="?*" part from the generated 
rules and only keep it in the generator (with the wait inside the generating 
part) to set a reasonable comment.


Greetings
Matthias Schwarzott

-- 
Matthias Schwarzott (zzam)

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