It turns out that my previous attempt to reproduce the vga crash using an image generated by grub-mkrescue (which is easier to work with than dealing with a full Ubuntu image) is invalid due to bad instrumentation in the "normal" module init and a stack overflow produced similar results including the boot loop and internal emulation error. It suggests, however, that the vga problem and other grub-related crashes are also caused by memory corruption in guest.
-- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/502107 Title: qemu-kvm 0.12.1.2 crashes booting Ubuntu 9.10 with "-vga std" Status in QEMU: Confirmed Bug description: I have an Ubuntu VM that works fine without "-vga std" but crashes if I add "-vga std". This is the full command line: qemu-system-x86_64 -vga std -drive cache=writeback,index=0,media=disk,file=ubuntu.img -k en-us -m 2048 -smp 2 -vnc :3102 -usbdevice tablet -enable-kvm & I get this error: KVM internal error. Suberror: 1 rax 00007f789177e000 rbx 0000000000000000 rcx 0000000000000000 rdx 0000000000000000 rsi 0000000000000000 rdi 00007f789177e000 rsp 00007fff361775e8 rbp 00007fff36177600 r8 000000000000ff80 r9 0000000000200000 r10 0000000000000000 r11 00007f789100a3f0 r12 00000000004017c0 r13 00007fff36178cf0 r14 0000000000000000 r15 0000000000000000 rip 00007f789100aa7b rflags 00013206 cs 0033 (00000000/ffffffff p 1 dpl 3 db 0 s 1 type b l 1 g 1 avl 0) ds 0000 (00000000/ffffffff p 0 dpl 0 db 0 s 0 type 0 l 0 g 0 avl 0) es 0000 (00000000/ffffffff p 0 dpl 0 db 0 s 0 type 0 l 0 g 0 avl 0) ss 002b (00000000/ffffffff p 1 dpl 3 db 1 s 1 type 3 l 0 g 1 avl 0) fs 0000 (7f78917906f0/ffffffff p 0 dpl 0 db 0 s 0 type 0 l 0 g 0 avl 0) gs 0000 (00000000/ffffffff p 0 dpl 0 db 0 s 0 type 0 l 0 g 0 avl 0) tr 0040 (ffff880001a09440/00002087 p 1 dpl 0 db 0 s 0 type b l 0 g 0 avl 0) ldt 0000 (00000000/ffffffff p 0 dpl 0 db 0 s 0 type 0 l 0 g 0 avl 0) gdt ffff8800019fa000/7f idt ffffffff818fd000/fff cr0 80050033 cr2 2408000 cr3 379d4000 cr4 6f0 cr8 0 efer d01 emulation failure, check dmesg for details I'm running kernel 2.6.32, and I have the kvm stuff compiled directly into the kernel. There's nothing in dmesg about kvm at all. Note that in the VM grub comes up, but the VM dies when I boot the kernel. This command line works: qemu-system-x86_64 -drive cache=writeback,index=0,media=disk,file=ubuntu.img -k en-us -m 2048 -smp 2 -vnc :3102 -usbdevice tablet -enable-kvm & That is, removing "-vga std" fixes the problem. I recently added this option to both my Ubuntu and Windows XP VMs. The Windows VM still works fine. If Windows can detect that the graphics card has changed, then Ubuntu should also have no problem. That being said, I added the std option when using 0.12.1.1, so there may be a qemu regression. I have reported this bug elsewhere: http://bugs.gentoo.org/show_bug.cgi?id=299211 To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/502107/+subscriptions
