https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211136
Bug ID: 211136
Summary: [Hyper-V]mount root may fail because vfs' mount starts
early than VMBUS
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: honz...@microsoft.com
FreeBSD 10.3/head on Azure may fail to boot for the failure of "mount root".
The reason is vfs's mounting starts early than storage driver attaching
(included in VMBUS).
If it happened, the error looks like:
VMBUS: Total online cpus 8, assign perf channel 2 to vcpu 7, cpu 7
VMBUS get multi-channel offer, rel=18,sub=1
VMBUS: new multi-channel offer <0xfffff80011719c00>, its primary channel is
<0xfffff80011766c00>.
VMBUS: channel <0xfffff80011719c00> open success.
Trying to mount root from ufs:/dev/da0p2 [rw]...
mountroot: waiting for device /dev/da0p2 ...
Mounting from ufs:/dev/da0p2 failed with error 19.
Loader variables:
vfs.root.mountfrom=ufs:/dev/da0p2
vfs.root.mountfrom.options=rw
Manual root filesystem specification:
<fstype>:<device> [options]
Mount <device> using filesystem <fstype>
and with the specified (optional) option list.
eg. ufs:/dev/da0s1a
zfs:tank
cd9660:/dev/acd0 ro
(which is equivalent to: mount -t cd9660 -o ro /dev/acd0 /)
? List valid disk boot devices
. Yield 1 second (for background tasks)
<empty line> Abort manual input
mountroot>
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