[qvm86-devel] Oops on Linux 2.6.12-rc3 when booting Windows 95

[Ross Kendall Axe]

Attempting to boot Windows 95 using qvm86 causes the oops shown below.
FWIW, kqemu seems to get no further, but Windows stops with the error
message 'Windows protection error. You must restart your computer'
rather than oopsing the host.

Ross


dmesg output follows:

qvm86: Creating guest VM
esp:00002f7c 00083000 ff400000
Unable to handle kernel NULL pointer dereference at virtual address 00000000
 printing eip:
c89a9260
*pde = 00000000
Oops: 0000 [#6]
PREEMPT
Modules linked in: qvm86 autofs4 realtime floppy via_agp agpgart
binfmt_misc tun w83627hf eeprom i2c_sensor i2c_isa i2c_viapro
snd_seq_virmidi snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq
snd_pcm_oss snd_mixer_oss snd_via82xx snd_ac97_codec snd_pcm snd_timer
snd_page_alloc snd_mpu401_uart snd_rawmidi snd_seq_device snd ne2k_pci
8390 ide_cd cdrom analog ns558 gameport joydev lp evdev parport_pc
parport psmouse
CPU:    0
EIP:    0060:[<c89a9260>]    Tainted: P      VLI
EFLAGS: 00010206   (2.6.12-rc3)
EIP is at qvm86_flush_shadow+0x90/0x120 [qvm86]
eax: c897c000   ebx: c5825000   ecx: 0000000c   edx: 00005000
esi: 00000000   edi: 002cd267   ebp: 00005000   esp: c2efddac
ds: 007b   es: 007b   ss: 0068
Process qemu (pid: 9382, threadinfo=c2efd000 task=c15970a0)
Stack: 0000000c 00000000 000003ff 00000001 c88c0000 00000003 c2efded4
c16b0000
       c88c0000 c89a99d2 c89aa93f 00002f7c 00083000 ff400000 c2efde8c
c4af44e0
       c2efdec4 00000001 c020fa55 00000000 00000200 c2efde38 c2efde38
c88c0000
Call Trace:
 [<c89a99d2>] qvm86_exec+0x452/0x680 [qvm86]
 [<c020fa55>] inode_has_perm+0x45/0x80
 [<c89a82dd>] qvm86_linux_ioctl+0xad/0x110 [qvm86]
 [<c0103a0e>] common_interrupt+0x1a/0x20
 [<c0166b65>] do_ioctl+0x65/0x90
 [<c0166d0e>] vfs_ioctl+0x5e/0x1b0
 [<c012827e>] sys_times+0x13e/0x1a0
 [<c0166eb9>] sys_ioctl+0x59/0xa0
 [<c0103051>] syscall_call+0x7/0xb
Code: d0 83 c8 20 89 04 8b 8b 4c 24 10 89 d5 81 e5 00 f0 ff ff 8b 41 20
8b 0c 24 8b 34 08 c7 44 24 08 ff 03 00 00 8d b4 26 00 00 00 00 <8b> 1e
f6 c3 01 75 19 c7 06 00 00 00 00 83 c6 04 83 c5 04 ff 4c
 <6>qvm86: Device closed

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