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+id = 2807
+title = "DOUBLE MMU FAULT when running -M virt in qemu-system-m68k"
+state = "closed"
+created_at = "2025-02-10T17:10:09.117Z"
+closed_at = "2025-02-10T18:34:05.422Z"
+labels = ["target: m68k", "workflow::Needs Info"]
+url = "https://gitlab.com/qemu-project/qemu/-/issues/2807"
+host-os = "Windows 11"
+host-arch = "x86_64"
+qemu-version = "QEMU emulator version 9.2.0 (v9.2.0-12071-g3dd0aeb44b)"
+guest-os = "None, I'm writing one."
+guest-arch = "m68k"
+description = """When running qemu-system-m68k with the -M virt machine type, a DOUBLE MMU FAULT occurs immediately upon startup, even without any BIOS, disk image, or additional configuration."""
+reproduce = """1. qemu-system-m68k -M virt -m 4M -serial stdio
+
+QEMU crashes immediately with the following output:
+```
+qemu: fatal: DOUBLE MMU FAULT
+D0 = 00000000   A0 = 00000000   F0 = 7fff ffffffffffffffff  (         nan)
+D1 = 00000000   A1 = 00000000   F1 = 7fff ffffffffffffffff  (         nan)
+D2 = 00000000   A2 = 00000000   F2 = 7fff ffffffffffffffff  (         nan)
+D3 = 00000000   A3 = 00000000   F3 = 7fff ffffffffffffffff  (         nan)
+D4 = 00000000   A4 = 00000000   F4 = 7fff ffffffffffffffff  (         nan)
+D5 = 00000000   A5 = 00000000   F5 = 7fff ffffffffffffffff  (         nan)
+D6 = 00000000   A6 = 00000000   F6 = 7fff ffffffffffffffff  (         nan)
+D7 = 00000000   A7 = 00000000   F7 = 7fff ffffffffffffffff  (         nan)
+PC = 00400000   SR = 2704 T:0 I:7 SI --Z--
+FPSR = 00000000 ----
+                                FPCR =     0000 X RN
+  A7(MSP) = 00000000   A7(USP) = 00000000 ->A7(ISP) = 00000000
+VBR = 0x00000000
+SFC = 0 DFC 0
+SSW 00000105 TCR 00000000 URP 00000000 SRP 00000000
+DTTR0/1: 00000000/00000000 ITTR0/1: 00000000/00000000
+MMUSR 00000000, fault at fffffffc
+```"""
+additional = """The issue seems to be related to incorrect memory initialization, causing a fault at address fffffffc.
+The PC = 00400000 suggests that QEMU is jumping to an invalid address early in the boot process.
+The fact that the fault is consistent across different configurations (q800, next-cube, etc) points to a possible regression or incomplete memory initialization in the virt machine."""