Bug 178534 - Missing rules causes hal and module loading problems
Summary: Missing rules causes hal and module loading problems
Alias: None
Product: Fedora
Classification: Fedora
Component: udev
Version: rawhide
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Harald Hoyer
QA Contact:
Depends On:
Blocks: FC5Blocker
TreeView+ depends on / blocked
Reported: 2006-01-21 15:15 UTC by David Zeuthen
Modified: 2013-03-06 03:44 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2006-01-24 16:40:46 UTC
Type: ---

Attachments (Terms of Use)

Description David Zeuthen 2006-01-21 15:15:18 UTC
While discussing a patch that broke hal, Kay Sievers (upstream udev maintainer)
pointed out (he checked our latest RPM) we're missing rules to cope with the
kernel. Pasting from IRC:

kay you should add this as 05-udev-early.rules:
kay # sysfs is populated after the event is sent
kay ACTION=="add", DEVPATH=="/devices/*", ENV{PHYSDEVBUS}=="?*",
kay ACTION=="add", SUBSYSTEM=="scsi", WAIT_FOR_SYSFS="ioerr_cnt"
kay ACTION=="add", SUBSYSTEM=="net", WAIT_FOR_SYSFS="address"
kay otherwise a lot of stuff does not work
kay including udev itself can't use BUS=="... 

Please fix this soon... Thanks!

Comment 1 Bill Nottingham 2006-01-23 04:24:13 UTC
What specifically is broken here that users would notice?

Comment 2 David Zeuthen 2006-01-23 14:04:54 UTC
Without these rules the events come out of order which messes
up the logic in HAL to e.g. reliably detect hotplugged drives.
Kay (he is the upstream udev maintainer now) also says it
affects module loading etc. I've seen noise on f-d-l about
this, maybe this is the root cause... I dunno though. I do
know that with

 ACTION=="add", SUBSYSTEM=="scsi", WAIT_FOR_SYSFS="ioerr_cnt"

hal CVS was broken (0.5.6 which is in rawhide was fine but
you never know..)

Suggest to talk to kay, he normally hangs hangs out on #hal
on Freenode. 

Also suggest to look at the udev rules that e.g. SUSE ships.

One of these days we should also rip out the hotplug.d and
dev.d interfaces from udev - these interfaces are old and
broken though interestingly enough we still rely on them
in hal. This will change in the next hal release where we
don't install a helper in hotplug.d but rather install a
udev rule to use SOCKET+=...

Comment 3 Bill Nottingham 2006-01-23 15:48:29 UTC
Still, this implies some sort of kernel bug, it seems - you shouldn't need to
wait for the bus in sysfs if you get a event for that bus. Mmmm, racy.

Comment 4 David Zeuthen 2006-01-23 16:31:29 UTC
Maybe. Talk to Kay.

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