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It seems bug Bug 559844 is present in Redhat 6 beta

Retrigger failed udev eventstrigger: unrecognized option '--retry-failed'

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux major release.  Product Management has requested further
review of this request by Red Hat Engineering, for potential inclusion in a Red
Hat Enterprise Linux Major release.  This request is not yet committed for
inclusion.

This is a regression. RHEL6b udev packages are version 147-2.6.el6. This is newer than the Fedora 12's 145-17.fc12. Fedora 12 packages don't exhibit this issue.

already fixed in udev >= 147-2.7.el6

the actual version (udev-147-2.29.el6) does not use the "--retry-failed" option

comparing with pre-fix version:

# diff udev-post /etc/init.d/udev-post 
29c29
<       /sbin/udevadm trigger --retry-failed
---
>       /sbin/udevadm trigger --type=failed

Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.