[Qemu-devel] [Bug 1839428] Re: qemu core dumped when repeat "system_reset" multiple times during guest boot

[Xujun Ma]

Upstream qemu-v3.1.0 pass
Upstream qemu-v3.1.1 pass
Upstream qemu-v4.0.0 fail
Upstream qemu-v4.0.0-rc0 fail

So the problem occurs due to patch between qemu-v3.1.1 to
qemu-v4.0.0-rc0.

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https://bugs.launchpad.net/bugs/1839428

Title:
   qemu core dumped when repeat "system_reset" multiple times during
  guest boot

Status in QEMU:
  New

Bug description:
  commit 864ab314f1d924129d06ac7b571f105a2b76a4b2 (HEAD, tag: v4.1.0-rc4, 
origin/master, origin/HEAD, master)
  Test arch:x86 and power

  Steps:
  1.Boot up guest with command
  power cmdline:
  /usr/libexec/backup/qemu-kvm \
   -smp 8 \
   -m 4096 \
   -nodefaults \
   -device 
virtio-blk-pci,id=image1,drive=drive_image1,bootindex=1,bus=pci.0,addr=0x7 \
   -drive 
file=rhel77-ppc64le-virtio.qcow2,if=none,id=drive_image1,format=qcow2,cache=none
 \
   -chardev stdio,mux=on,id=serial_id_serial0,server,nowait,signal=off \
   -device spapr-vty,id=serial111,chardev=serial_id_serial0 \
   -mon chardev=serial_id_serial0,mode=readline \
  x86 cmdline:
  /usr/libexec/qemu-kvm \
   -m 4096 -smp 8 \
   -boot menu=on \
   -device virtio-blk-pci,id=image1,drive=drive_image1\
   -drive 
file=rhel77-64-virtio.qcow2,if=none,id=drive_image1,format=qcow2,cache=none \
   -vga std \
   -vnc :9 \
   -nographic \
   -device virtio-net-pci,netdev=net0,id=nic0,mac=52:54:00:c4:e7:84 \
   -netdev 
tap,id=net0,script=/etc/qemu-ifup,downscript=/etc/qemu-ifdown,vhost=on \

  2.when guest start to boot up kernel(when no output infomation),run
  hmp command "system_reset"

  
  Result:

  Sometimes,qemu core dumped with error as following:
  system_reset
  (qemu) qemu-system-ppc64: /root/qemu/hw/virtio/virtio.c:225: 
vring_get_region_caches: Assertion `caches != NULL' failed.
  b.sh: line 11: 73679 Aborted                 (core dumped) 
/usr/local/bin/qemu-system-ppc64 -enable-kvm -smp 8 -m 4096 -nodefaults -device 
virtio-blk-pci,id=image1,drive=drive_image1,bootindex=1,bus=pci.0,addr=0x7 
-drive 
file=rhel77-ppc64le-virtio.qcow2,if=none,id=drive_image1,format=qcow2,cache=none
 -chardev stdio,mux=on,id=serial_id_serial0,server,nowait,signal=off -device 
spapr-vty,id=serial111,chardev=serial_id_serial0 -mon 
chardev=serial_id_serial0,mode=readline

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