Bug#830770: mdadm: initramfs broken

[Jamie Heilman]

Package: mdadm
Version: 3.4-2
Severity: important

With 3.4-2 my lvm on partitioned md system has stopped initializing
correctly.  For starters when upgrading from 3.4-1 to 3.4-2 I get
this:
W: mdadm: the array /dev/md/d0 with UUID 4c4bcb71:267c92fc:fe08e7ef:27569e0b
W: mdadm: is currently active, but it is not listed in mdadm.conf. if
W: mdadm: it is needed for boot, then YOUR SYSTEM IS NOW UNBOOTABLE!
W: mdadm: please inspect the output of /usr/share/mdadm/mkconf, compare
W: mdadm: it to /etc/mdadm/mdadm.conf, and make the necessary changes.

This is thanks to the change of:
    if ! grep -qi "uuid=$uuid" $DESTMDADMCONF; then
to
                        if ! grep -q "UUID=$uuid" $DESTMDADMCONF; then

The manpage uses uuid=, the examples use both uuid= and UUID=, and the
uuid itself had better be treated as case-insensitive... so if you ask
me, it's cleaner and more correct, to just do:

  uuid=`echo "$params" | grep -oi ' uuid=[0-9a-f:]\+'`
  if ! grep -qi "$uuid" $DESTMDADMCONF; then
    ...

That said, this isn't why my system stopped booting after updating to
3.4-2, it's just an irritating distraction.

AFAICT, the new initramfs-tools scripts simply never assemble
any arrays.  The old local-top/mdadm script ran either
$MDADM --assemble --scan --run --auto=yes${extra_args:+ $extra_args}
or $MDADM --assemble --scan --run --auto=yes $dev
depending on $MD_DEVS.

If run I mdadm --assemble --scan manually after the initramfs has
dumped me to a shell, and then keep kicking various lvm scripts until
I get my root device to show up, I can proceed, but this new package
strikes me as very, very broken.

Here's some of the blather from /usr/share/bug/mdadm/script but let me
prefix this with, I've pruned out detail that wasn't germane, and my
topology is lvm on top of md raid1 on a traditional sysvinit system.

--- mdadm.conf
DEVICE /dev/sd[ab]
HOMEHOST <system>
MAILADDR root
ARRAY /dev/md/d0 metadata=1.0 UUID=4c4bcb71:267c92fc:fe08e7ef:27569e0b name=cucamonga:d0

--- /etc/default/mdadm
AUTOCHECK=true
START_DAEMON=true
DAEMON_OPTIONS="--syslog"
VERBOSE=false

--- /proc/mdstat:
Personalities : [raid1] 
md_d0 : active raid1 sda[0] sdb[1]
      976762448 blocks super 1.0 [2/2] [UU]
      
unused devices: <none>

--- /proc/partitions:
major minor  #blocks  name

   8        0  976762584 sda
   8       16  976762584 sdb
 253        0  976762448 md_d0
 253        1  968373248 md_d0p1
 253        2    8388176 md_d0p2

--- LVM physical volumes:
File descriptor 3 (/dev/pts/5) leaked on pvs invocation. Parent PID 16632: /bin/bash
  PV           VG Fmt  Attr PSize   PFree  
  /dev/md_d0p1 S  lvm2 a--  923.51g 545.51g

--- /proc/modules:
dm_crypt 24576 1 - Live 0xffffffffa0222000
raid1 32768 1 - Live 0xffffffffa0016000
md_mod 98304 4 raid1, Live 0xffffffffa0021000
dm_mod 86016 26 dm_crypt, Live 0xffffffffa0000000

--- volume detail:
/dev/sda:
          Magic : a92b4efc
        Version : 1.0
    Feature Map : 0x0
     Array UUID : 4c4bcb71:267c92fc:fe08e7ef:27569e0b
           Name : cucamonga:d0  (local to host cucamonga)
  Creation Time : Fri Feb 11 07:29:10 2011
     Raid Level : raid1
   Raid Devices : 2

 Avail Dev Size : 1953524896 (931.51 GiB 1000.20 GB)
     Array Size : 976762448 (931.51 GiB 1000.20 GB)
   Super Offset : 1953525152 sectors
   Unused Space : before=0 sectors, after=256 sectors
          State : clean
    Device UUID : 03d87172:57951a8c:b9b40189:051ed01b

    Update Time : Mon Jul 11 09:27:06 2016
       Checksum : b10e71e7 - correct
         Events : 2479


   Device Role : Active device 0
   Array State : AA ('A' == active, '.' == missing, 'R' == replacing)
--
/dev/sdb:
          Magic : a92b4efc
        Version : 1.0
    Feature Map : 0x0
     Array UUID : 4c4bcb71:267c92fc:fe08e7ef:27569e0b
           Name : cucamonga:d0  (local to host cucamonga)
  Creation Time : Fri Feb 11 07:29:10 2011
     Raid Level : raid1
   Raid Devices : 2

 Avail Dev Size : 1953524896 (931.51 GiB 1000.20 GB)
     Array Size : 976762448 (931.51 GiB 1000.20 GB)
   Super Offset : 1953525152 sectors
   Unused Space : before=0 sectors, after=256 sectors
          State : clean
    Device UUID : dcee8016:570d79ee:40fd87f0:26c35131

    Update Time : Mon Jul 11 09:27:06 2016
       Checksum : 3483ee6a - correct
         Events : 2479


   Device Role : Active device 1
   Array State : AA ('A' == active, '.' == missing, 'R' == replacing)

--- /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-4.6.1 root=/dev/mapper/S-root ro rng-core.default_quality=512

--- udev:
ii  udev           230-7        amd64        /dev/ and hotplug management daem
aa83f41de49462d05e446cfc5e14e74b  /lib/udev/rules.d/63-md-raid-arrays.rules
5de7d0b70cd948d00bb38ca75ad5f288  /lib/udev/rules.d/64-md-raid-assembly.rules

--- /dev:
brw-rw---- 1 root disk 253, 0 Jul 11 05:47 /dev/md_d0
brw-rw---- 1 root disk 253, 1 Jul 11 05:47 /dev/md_d0p1
brw-rw---- 1 root disk 253, 2 Jul 11 05:47 /dev/md_d0p2




-- 
Jamie Heilman                     http://audible.transient.net/~jamie/