[Bug 531240] Re: breaking raid: root raid_member opened as luks

[ceg]

** Description changed:

  Binary package hint: util-linux
  
  After the member is opened as luks device it is booted instead of the md
  device, while the raid remains "inactive".
  
  I first noticed /proc/mdstat reported the root raid as inactive
  (although the system seemed to run fine!).
  
  Looking further it seemed like during boot the system has unlocked and mounted the rootfs using (only) one raid_member located on an external usb disk directly. ("dmsetup deps" pointed to it for mdX_crypt)
  I guess since the usb raid_member was busy then, the system was not able to start the raid, and so it remained inactive.
  
  Which part of the system is involved in setting up the root and could
  have messed things up here?
  
  Calling "sudo blkid" reported what actually is an USB
  "linux_raid_member" as TYPE="crypto_LUKS".
  
  @util-linux
  I found the following in the util-linux changelog:
    * Always return encrypted block devices as the first detected encryption
       system (ie. LUKS, since that's the only one) rather than probing for
       additional metadata and returning an ambivalent result.  LP: #428435.
  might that cause the precedence of reporing luks over raid_member for the usb disk?
  
  @cryptsetup
- [0) cryptsetup (not beeing udev but boot script driven really needs to be hooked into the event driven startup properly and not search for disks itself. -> now added to Bug #251164]
+  "cryptsetup isLuks" and "cryptsetup luksOpen" are not checking for luks devices correctly: "cryptsetup isLuks <raid member device with luks on it>" returns $?=0 (success/true) which it should not.
  
- 1) "cryptsetup isLuks"is looking for/checking luks headers (without
- prioritizing( on its own? cryptsetup isLuks <raid member dev with luks
- on it> returns $?=0 (success/true) which it should not.
- 
- 
- I did not notice this happening with non-usb disks, and also it did not happen at first. (so it might happen related to a recent update or when the mountall/cryptsetup times out?) How to get more details? Edit: the alternate CD's rescue-mode wants to open internal raid members just as well.
+ [I first did not notice this happening with non-usb disks, and also it
+ did not happen right after initial install. (so it might happen related
+ to a recent update or when the mountall/cryptsetup times out?) How to
+ get more details? Edit: Happens according order of device enumeration on
+ boot (random assembly), the alternate CD's rescue-mode wants to open
+ internal raid members just as well, and it's not usb dependent.]

-- 
breaking raid: root raid_member opened as luks
https://bugs.launchpad.net/bugs/531240
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