[Bug 247323] Assertion failed: (((flags[i] & VRING_DESC_F_WRITE) == 0) == writeop), function pci_vtblk_proc, file /usr/src/usr.sbin/bhyve/pci_virtio_block.c, line 250.

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247323

            Bug ID: 247323
           Summary: Assertion failed: (((flags[i] & VRING_DESC_F_WRITE) ==
                    0) == writeop), function pci_vtblk_proc, file
                    /usr/src/usr.sbin/bhyve/pci_virtio_block.c, line 250.
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bhyve
          Assignee: virtualization at FreeBSD.org
          Reporter: bugs-syssec at rub.de

Created attachment 215624
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=215624&action=edit
virtio_blk_7.zip

To reproduce run the following commands:
```
bhyvectl --vm=testvm --destroy
bhyve.full -s 2:0,ahci-cd,hypertrash_os_bios_crash.iso -w -H -s 0:0,hostbridge
-s 1:0,lpc -l com1,stdio -s 3,fbuf,tcp=0.0.0.0:5900,w=800,h=600 -c 1 -m 320M -s
4:0,virtio-blk,disk.img -l
bootrom,/usr/local/share/uefi-firmware/BHYVE_UEFI_CSM.fd testvm
```

bhyve version:
```
# freebsd 12.1
$ svnlite checkout https://svn.freebsd.org/base/releng/12.1 /usr/src
$ cd /usr/src/usr.sbin/bhyve/; make -m /usr/src/share/mk
$ ls /usr/obj/usr/src/amd64.amd64/usr.sbin/bhyve/bhyve.full
```

setup:
```
kldload vmm
dd if=/dev/zero of=disk.img bs=1024 count=1024
```

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