Bug 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 Reporter: bugs-syssec
Component: bhyveAssignee: freebsd-virtualization (Nobody) <virtualization>
Status: New ---    
Severity: Affects Only Me    
Priority: ---    
Version: 12.1-RELEASE   
Hardware: Any   
OS: Any   
Attachments:
Description Flags
virtio_blk_7.zip none

Description bugs-syssec 2020-06-16 16:42:53 UTC 
Created attachment 215624 [details]
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
```