[Bug 1005457] [NEW] [patch] mdadm - initramfs script doesn't wait for udev rules to complete

[Ynot]

Public bug reported:

I have a system using software RAID that seems to take a long time for the on-boot udev rules to complete.
This means that mdadm incorrectly thinks the array had degraded, when in fact the component devices are not yet ready

Symptoms:
- System fails to boot correctly, and drops into the initramfs recovery prompt
- On exiting the initramfs recovery prompt, mdadm array not assembled
- Array has to be assembled manually

Altering the initramfs mdadm script to wait for udev to settle down
seems to solve the issue

--- /usr/share/initramfs-tools/scripts/mdadm-functions	2012-05-28 10:45:28.068832673 +0100
+++ /usr/share/initramfs-tools/scripts/mdadm-functions-new	2012-05-28 10:45:19.156845003 +0100
@@ -3,6 +3,7 @@
 
 degraded_arrays()
 {
+	udevadm settle
 	mdadm --misc --scan --detail --test >/dev/null 2>&1
 	return $((! $?))
 }

then rebuilding the initramfs
# update-initramfs -u

** Affects: initramfs-tools (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1005457

Title:
  [patch] mdadm - initramfs script doesn't wait for udev rules to
  complete

Status in “initramfs-tools” package in Ubuntu:
  New

Bug description:
  I have a system using software RAID that seems to take a long time for the on-boot udev rules to complete.
  This means that mdadm incorrectly thinks the array had degraded, when in fact the component devices are not yet ready

  Symptoms:
  - System fails to boot correctly, and drops into the initramfs recovery prompt
  - On exiting the initramfs recovery prompt, mdadm array not assembled
  - Array has to be assembled manually

  Altering the initramfs mdadm script to wait for udev to settle down
  seems to solve the issue

  --- /usr/share/initramfs-tools/scripts/mdadm-functions	2012-05-28 10:45:28.068832673 +0100
  +++ /usr/share/initramfs-tools/scripts/mdadm-functions-new	2012-05-28 10:45:19.156845003 +0100
  @@ -3,6 +3,7 @@
   
   degraded_arrays()
   {
  +	udevadm settle
   	mdadm --misc --scan --detail --test >/dev/null 2>&1
   	return $((! $?))
   }

  then rebuilding the initramfs
  # update-initramfs -u

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