[Bug 253087] Timeout of bufdaemon happens at shutdown time with -CURRENT amd64 and VirtualBox VM

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253087

--- Comment #1 from Yasuhiro Kimura <yasu at utahime.org> ---
Following is detailed step of reproducing this problem.

1.  Download FreeBSD-14-CURRENT-20210211-c511a5ab53b-256609-disc1.iso from
FreeBSD.org download server (https://download.freebsd.org/)

2.  Create new VirtualBox VM with following settings. -- (*1)

    General:
      Name: FreeBSD
      Operating System: FreeBSD (64-bit)
    System:
      Base Memory: 8192 MB
      Processors: 4
      Boot Order: Hard Disk
      EFI: Enabled
      Acceleration: VT-x/AMD-V, Nested Paging
    Display:
      Video Memory: 16 MB
      Graphic Controller: VMSVGA
      Remote Desktop Server: Disabled
      Recording: Disabled
    Storage:
      Controller: AHCI
        SATA Port 0: FreeBSD.vdi (Normal 100GB)
        SATA Port 1: [Optical Drive]
FreeBSD-14-CURRENT-20210211-c511a5ab53b-256609-disc1.iso 
    Audio:
      Disabled
    Network:
      Adapter 1: Intal PRO/1000 MT Desktop (Bridged Adapter, Realtek PCIe GBE
Family Controller)
    USB:
      USB Controller: OHCI EHCI
      Device Filters: 0 (0 active)
    Shared folders:
      None

3.  Start VM

4.  Install OS with following settings. -- (*2)

    * Use default keymap
    * Install base, kernel and lib32
    * Select 'Auto (ZFS)' as partitioning
    * Change 2 items of ZFS configuration
      - Partition scheme -> GPT (UEF1)
      - Swap Size -> 8g
    * Select 'stripe' as Virtual Device Type
    * Select 'ada0: VBOX HEADDISK'
    * Configure 'em0' as following
      IPv4: manual configuration
      IPv6: disabled
    * Set Time Zone to 'Asia/Japan'
    * Enable 'sshd', 'ntpdate', 'ntpd' and 'dumpdev'
    * No security hardening options
    * Don't add user accounts
    * Do nothing at final configuration
    * Don't do manual configuration
    * Reboot

5.  Login as root

6.  cd /usr

7.  pkg install git-tiny

8.  git clone https://git.freebsd.org/src.git

9.  cd src

10. make -j 4 buildworld

11 shutdown -h now

Note: (*1),(*2)
Not sure if each setting affects the problem. I just wrote what I did while
creating VM and installing OS.

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