[Qemu-devel] [Bug 1459626] [NEW] emacs (gtk3) core dumped with -vga qxl

[Tom Yan]

Public bug reported:

Emacs (gtk3) exited with bus error and core dumped with -vga qxl. If I
use the builtin modesetting xorg driver, emacs could survive for a short
while sometimes. If I use xf86-video-qxl (git r587.8babd05), it dies
right away with the same error. It seems to corrupt xorg at some point
as well, because sometimes I cannot exit i3 properly and gnome-terminal
can go crazy afterwards (all letters become empty retangles).

It doesn't seem to happen with other -vga driver.

Error message is attached. Can also provide the core dumped but it's of
47M.

I started the vm as root (sudo) with the following command: qemu-system-
x86_64 -enable-kvm -m 4G -virtfs
local,mount_tag=qemu,security_model=passthrough,path=/mnt/qemu/ -kernel
/mnt/qemu/boot/vmlinuz-linux -initrd /mnt/qemu/boot/initramfs-linux-
fallback.img -append 'rw root=qemu fstype=9p' -usbdevice tablet -vga qxl
-spice port=12345,disable-ticketing

/mnt/qemu is a btrfs snapshot of the subvolume used as the host root

Arch Linux, qemu 2.3.0, emacs 24.5, xorg-server 1.17.1, linux 4.0.4, gtk
3.16.3, glib 2.44.1

** Affects: qemu
     Importance: Undecided
         Status: New


** Tags: bus core dump emacs error gtk qemu qxl spice

** Attachment added: "Error message"
   
https://bugs.launchpad.net/bugs/1459626/+attachment/4406109/+files/emacs_error

** Tags added: bus core dump emacs error gtk qemu qxl spice

** Description changed:

  Emacs (gtk3) exited with bus error and core dumped with -vga qxl. If I
  use the builtin modesetting xorg driver, emacs could survive for a short
  while sometimes. If I use xf86-video-qxl (git r587.8babd05), it dies
  right away with the same error. It seems to corrupt xorg at some point
  as well, because sometimes I cannot exit i3 properly and gnome-terminal
  can go crazy afterwards (all letters become empty retangles).
  
  It doesn't seem to happen with other -vga driver.
  
  Error message is attached. Can also provide the core dumped but it's of
  47M.
  
  I started the vm as root (sudo) with the following command: qemu-system-
  x86_64 -enable-kvm -m 4G -virtfs
  local,mount_tag=qemu,security_model=passthrough,path=/mnt/qemu/ -kernel
  /mnt/qemu/boot/vmlinuz-linux -initrd /mnt/qemu/boot/initramfs-linux-
  fallback.img -append 'rw root=qemu fstype=9p' -usbdevice tablet -vga qxl
  -spice port=12345,disable-ticketing
  
  /mnt/qemu is a btrfs snapshot of the subvolume used as the host root
  
- Arch Linux, qemu 2.3.0, xorg-server 1.17.1, linux 4.0.4, gtk 3.16.3,
- glib 2.44.1
+ Arch Linux, qemu 2.3.0, emacs 24.5, xorg-server 1.17.1, linux 4.0.4, gtk
+ 3.16.3, glib 2.44.1

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https://bugs.launchpad.net/bugs/1459626

Title:
  emacs (gtk3) core dumped with -vga qxl

Status in QEMU:
  New

Bug description:
  Emacs (gtk3) exited with bus error and core dumped with -vga qxl. If I
  use the builtin modesetting xorg driver, emacs could survive for a
  short while sometimes. If I use xf86-video-qxl (git r587.8babd05), it
  dies right away with the same error. It seems to corrupt xorg at some
  point as well, because sometimes I cannot exit i3 properly and gnome-
  terminal can go crazy afterwards (all letters become empty retangles).

  It doesn't seem to happen with other -vga driver.

  Error message is attached. Can also provide the core dumped but it's
  of 47M.

  I started the vm as root (sudo) with the following command: qemu-
  system-x86_64 -enable-kvm -m 4G -virtfs
  local,mount_tag=qemu,security_model=passthrough,path=/mnt/qemu/
  -kernel /mnt/qemu/boot/vmlinuz-linux -initrd /mnt/qemu/boot/initramfs-
  linux-fallback.img -append 'rw root=qemu fstype=9p' -usbdevice tablet
  -vga qxl -spice port=12345,disable-ticketing

  /mnt/qemu is a btrfs snapshot of the subvolume used as the host root

  Arch Linux, qemu 2.3.0, emacs 24.5, xorg-server 1.17.1, linux 4.0.4,
  gtk 3.16.3, glib 2.44.1

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