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lvm2 crashes and burns with 2.6.10-4 (svn snapshot 2298)

This is apparently related to #281831, so I am directing it there.

The "opendir failed" messages might be "harmless" on 2.6.10-3 and before,
but after I applied the patches in queue for 2.6.10-4, it causes lvm to
fail completely (thus, I am Cc'ing debian-kernel as well, so that they are
aware of the issue).

Unfortunately, I can't easily debug why, since at that time, I don't have
even strace working (because just about everything is on lvm...)

If this is not an issue with 2.6.10-4 (e.g. it is actually caused by lvm2
doing something really braindead -- which IS likely since it is doing
something stupid on the other kernels as well), then #281831 will have to be
raised to grave or critical.

vgscan --mknodes unlinks /dev/vg_raid1 (the VG where my LVM lvs live), but
apparently it fails to create it back.

/dev is udev-based (tmpfs).  Manually poking around it (mkdir, etc) works
just fine.

This same setup, with the exact same .config worked in 2.6.10-3.  Maybe one
of the new security clamps is hosing something lvm2 is trying to do?

  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh

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