Description:
Since recent update, my system randomly boot and detect my RAID array:
"waiting for /dev/md0 for 10 seconds" message and fallback to initrd shell

Booting with linux-lts fix the issue, so but in current kernel version/package.


[root@arch gnumdk]# lspci
00:00.0 Host bridge: Intel Corporation 82G33/G31/P35/P31 Express DRAM Controller (rev 10)
00:01.0 PCI bridge: Intel Corporation 82G33/G31/P35/P31 Express PCI Express Root Port (rev 10)
00:1b.0 Audio device: Intel Corporation N10/ICH 7 Family High Definition Audio Controller (rev 01)
00:1c.0 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 1 (rev 01)
00:1c.1 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 2 (rev 01)
00:1d.0 USB controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #1 (rev 01)
00:1d.1 USB controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #2 (rev 01)
00:1d.2 USB controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #3 (rev 01)
00:1d.3 USB controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #4 (rev 01)
00:1d.7 USB controller: Intel Corporation N10/ICH 7 Family USB2 EHCI Controller (rev 01)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev e1)
00:1f.0 ISA bridge: Intel Corporation 82801GB/GR (ICH7 Family) LPC Interface Bridge (rev 01)
00:1f.2 IDE interface: Intel Corporation N10/ICH7 Family SATA Controller [IDE mode] (rev 01)
00:1f.3 SMBus: Intel Corporation N10/ICH 7 Family SMBus Controller (rev 01)
01:00.0 VGA compatible controller: NVIDIA Corporation G94 [GeForce 9600 GT] (rev a1)
03:00.0 Ethernet controller: Realtek Sem

[gnumdk@arch ~]$ cat /etc/mdadm.conf
ARRAY /dev/md0 metadata=0.90 UUID=2fc26e1a:69c59d06:28ce60cc:cdc1a7b9
ARRAY /dev/md1 metadata=0.90 UUID=882d9949:7f392ef1:bab67cfc:812a4213

[gnumdk@arch ~]$ cat /etc/fstab
#
# /etc/fstab: static file system information
#
# <file system> <dir> <type> <options> <dump> <pass>
tmpfs /tmp tmpfs nodev,nosuid 0 0
/dev/md1 /home ext4 defaults,noatime 0 1
/dev/md0 / ext4 defaults,noatime 0 1
/dev/sda2 swap swap defaults 0 0
/dev/sdb2 swap swap defaults 0 0

[root@arch gnumdk]# LANG=C fdisk -l /dev/sdb

Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000c88c4

Device Boot Start End Blocks Id System
/dev/sdb1 * 63 39070079 19535008+ fd Linux raid autodetect
/dev/sdb2 39070080 39568094 249007+ 82 Linux swap / Solaris
/dev/sdb3 39568095 976768064 468599985 fd Linux raid autodetect

[gnumdk@arch ~]$ grep HOOK /etc/mkinitcpio.conf
HOOKS="base udev autodetect scsi sata mdadm filesystems usbinput"

[gnumdk@arch ~]$ grep MODULES /etc/mkinitcpio.conf
MODULES="dm_mod"