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Subject: [Bug 211136] [Hyper-V]mount root may fail because vfs' mount starts
 early than VMBUS
Date: Fri, 15 Jul 2016 07:40:21 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D211136

            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: honzhan@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=3D18,sub=3D1
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=3Dufs:/dev/da0p2
  vfs.root.mountfrom.options=3Drw

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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