When booting a virtual machine with this kernel version under Xen bootup fails because the root fs cannot be mounted; it appears that the Xen block devices (xvd) are missing, as no options are shown by the kernel. Last part of bootup says:<br />
<br />
drivers/rtc/hctosys.c: unable to open rtc device (rtc0)<br />
Initalizing network drop monitor service<br />
md: Waiting for all devices to be available before autodetect<br />
md: If you don't use raid, use raid=noautodetect<br />
md: Autodetecting RAID arrays.<br />
md: Scanned 0 and added 0 devices.<br />
md: autorun ...<br />
md: ... autorun DONE.<br />
VFS: Cannot open root device "UUID=113b4ba4-7d83-4bb0-bbdb-c49fa254d92e" or unknown-block(0,0)<br />
Please append a correct "root=" boot option; here are the available partitions:<br />
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)<br />
Pid: 1, comm: swapper Not tainted 2.6.32-504.el6.centos.plus.x86_64 <a href="http://bugs.centos.org/view.php?id=1">0000001</a><br />
Call Trace:<br />
[<ffffffff81530b5c>] ? panic+0xa7/0x16f<br />
[<ffffffff81c2b432>] ? mount_block_root+0x216/0x2cb<br />
[<ffffffff81002930>] ? bstat+0x2b0/0x980<br />
[<ffffffff81c2b53d>] ? mount_root+0x56/0x5a<br />
[<ffffffff81c2b6b1>] ? prepare_namespace+0x170/0x1a9<br />
[<ffffffff81c2a92a>] ? kernel_init+0x2e1/0x2f7<br />
[<ffffffff8100c20a>] ? child_rip+0xa/0x20<br />
[<ffffffff8100b294>] ? int_ret_from_sys_call+0x7/0x1b<br />
[<ffffffff8100ba1d>] ? retint_restore_args+0x5/0x6<br />
[<ffffffff8100c200>] ? child_rip+0x0/0x20<br />
<br />
The same VM works fine when booted with kernel 2.6.32-431.29.2.el6.centos.plus.x86_64.
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