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[qemu-system-m68k] [q800] Ishar 1 makes Qemu crash
Description of problem:
qemu-system-m68k crashes when running the classic RPG game "Ishar", this is what can be seen on the TTY console on the host system:
```
qemu: fatal: DOUBLE MMU FAULT
D0 = 000000af A0 = 000b91d2 F0 = 7fff ffffffffffffffff ( nan)
D1 = 00000074 A1 = 50f02000 F1 = 7fff ffffffffffffffff ( nan)
D2 = 00000000 A2 = 00067274 F2 = 7fff ffffffffffffffff ( nan)
D3 = f7f6f600 A3 = 40809be0 F3 = 7fff ffffffffffffffff ( nan)
D4 = f8ff2a2a A4 = 00000000 F4 = 7fff ffffffffffffffff ( nan)
D5 = 54aa0027 A5 = 007ef2b8 F5 = 7fff ffffffffffffffff ( nan)
D6 = 0000000a A6 = 000001e3 F6 = 7fff ffffffffffffffff ( nan)
D7 = ffffffe6 A7 = 0000000a F7 = 7fff ffffffffffffffff ( nan)
PC = 00067288 SR = 2218 T:0 I:2 SI XN---
FPSR = 00000000 ----
FPCR = 0000 X RN
A7(MSP) = 00000000 A7(USP) = 00000000 ->A7(ISP) = 0000000a
VBR = 0x00000000
SFC = 0 DFC 5
SSW 00000445 TCR 0000c000 URP 00000000 SRP 01ff6c00
DTTR0/1: 00000000/00000000 ITTR0/1: 00000000/00000000
MMUSR 00000000, fault at fffffffe
./mac: line 5: 806788 Aborted (core dumped) qemu-system-m68k -M q800 -m 32 -bios q800.rom -display sdl -audio driver=alsa -device scsi-hd,scsi-id=0,drive=hd0 -drive file=system71.img,media=disk,format=raw,if=none,id=hd0 -display sdl
```
Steps to reproduce:
1. Download Ishar 1 Color version (available in https://www.grenier-du-mac.net/fiches/Jeux/ishar1.htm, on the lower part of the page).
2. Copy it to the emulated system and decompress the .sit archive with Stuffit Expander 5.5
3. Run the game by clicking on it's icon and clicking on "Commandes->Jouer" or pressing Command+J
4. Watch it making qemu-system-m68k crash'n burn!
Additional information:
The same game works fine on current MAME Mac II/Ci emulation, etc.
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