Reported as a bug at: https://bugs.launchpad.net/qemu/+bug/1034423
First observed with OpenSolaris 2009.06, and also applies to the latest OpenIndiana release. Version: qemu-kvm 1.1.1 Hardware: 2 x AMD Opteron 6128 8-core processors, 64GB RAM. These guests boot on equivalent Intel hardware. To reproduce: qemu-kvm -nodefaults -m 512 -cpu host -vga cirrus -usbdevice tablet -vnc :99 -monitor stdio -hda drive.img -cdrom oi-dev-151a5-live-x86.iso -boot order=dc I've tested with "-vga std" and various different emulated CPU types, to no effect. What happens: GRUB loads, and offers multiple boot options, but none work. Some kind of kernel panic flies by very fast before restarting the VM, and careful use of the screenshot button reveals that it reads as follows: panic[cpu0]/thread=fec22de0: BAD TRAP: type=8 (#df Double fault) rp=fec2b48c add r=0 #df Double fault pid=0, pc=0xault pid=0, pc=0xfe800377, sp=0xfec40090, eflags=0x202 cr0: 80050011<pg,wp,et,pe> cr4:b8<pge,pae,pse,de> cr2: 0cr3: ae2f000 gs: 1b0 fs: 0 es: 160 ds: 160 edi: 0 esi: 0 ebp: 0 esp: fec2b4c4 ebx: c0010015 edx: 0 ecx: 0 eax: fec40400 trp: 8 err: 0 eip: fe800377 cs: 158 efl: 202 usp: fec40090 ss: 160 tss.tss_link: 0x0 tss.tss_esp0: 0x0 tss.tss_ss0: 0x160 tss.tss_esp1: 0x0 tss.tss_ss1: 0x0 tss.tss esp2: 0x0 tss.tss_ss2: 0x0 tss.tss_cr3: 0xae2f000 tss.tss_eip: 0xfec40400 tss.tss_eflags: 0x202 tss.tss_eax: 0xfec40400 tss.tss_ebx: 0xc0010015 tss.tss_ecx: 0xc0010000 tss.tss_edx: 0x0 tss.tss_esp: 0xfec40090 Warning - stack not written to the dumpbuf fec2b3c8 unix:due+e4 (8, fec2b48c, 0, 0) fec2b478 unix:trap+12fa (fec2b48c, 0, 0) fec2b48c unix:_cmntrap+7c (1b0, 0, 160, 160, 0) If there's any more, I haven't managed to catch it. Solaris 11 does not seem to suffer from the same issue, although the first message that appears at boot (after the version info) is "trap: Unkown trap type 8 in user mode". Could be related? As always, thanks in advance and please let me know if I can help to test, or provide any more information. Thanks, Owen