I have a Centos 6 server that's been running fine for 6mths on Google Compute Platform for the past 6mths.
Without a restart - it froze this morning and on reboot is producing the following errors on boot:
[ 3.205240] VFS: Cannot open root device "UUID=e2eb8dc4-d9f9-48e8-9194-cdbff5f4513f" or unknown-block(0,0)
[ 3.208204] Please append a correct "root=" boot option; here are the available partitions:
[ 3.210557] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
[ 3.213256] Pid: 1, comm: swapper veid: 0 Not tainted 2.6.32-673.8.1.lve1.4.3.1.el6.x86_64 #1
[ 3.215642] Call Trace:
[ 3.216263] [<ffffffff81546288>] ? panic+0xa7/0x16f
[ 3.217749] [<ffffffff81c45515>] ? mount_block_root+0x208/0x2bd
[ 3.219708] [<ffffffff81002930>] ? bstat+0x200/0x8d0
[ 3.221633] [<ffffffff81c45620>] ? mount_root+0x56/0x5a
[ 3.223300] [<ffffffff81c45794>] ? prepare_namespace+0x170/0x1a9
[ 3.225390] [<ffffffff81c44ac2>] ? kernel_init+0x2e6/0x2fc
[ 3.227119] [<ffffffff8100971d>] ? __switch_to+0x7d/0x340
[ 3.228979] [<ffffffff8100c3ca>] ? child_rip+0xa/0x20
[ 3.231076] [<ffffffff81c447dc>] ? kernel_init+0x0/0x2fc
[ 3.232883] [<ffffffff8100c3c0>] ? child_rip+0x0/0x20
I have shut down the instance and attached the disk to another machine and:
- Checked boot partition is not full (there is no separate boot partition)
- Checked grub default is set to 0 (not 1)
- Checked /etc/fstab has the correct UUID for the disk