BasiliskII intermittently fails to start on Debian/Linux and always fails to restart

[gorlik]

BasiliskII intermittently fails to start with the following error:

$ ./BasiliskII Basilisk II V1.1 by Christian Bauer et al. Reading ROM file... Using SDL/pulseaudio audio output Using SDL_Renderer driver: opengl Caught SIGSEGV at address 0x14067b000 [IP=0x419a48] D0: 00000000 D1: 0000003a D2: 00185bfc D3: 0000ffff D4: ffffffff D5: 000000f0 D6: 00000000 D7: 00030005 A0: 02000956 A1: 00185bfc A2: 00185cac A3: 00002120 A4: 04009ae6 A5: 03ffffa2 A6: 02000996 A7: 020008e6 USP=00000000 ISP=020008e6 MSP=00000000 VBR=00000000 T=00 S=1 M=0 X=0 N=0 Z=1 V=0 C=0 IMASK=0 FP0: nan FP1: nan FP2: nan FP3: nan FP4: nan FP5: nan FP6: nan FP7: nan N=0 Z=0 I=0 NAN=0 00185ce6: 7119 0c68 0001 001a 6604 EMULOP.L #$00000019 next PC: 00185ce8

the address of the SIGSEGV is different every time but the emulated address/instruction is always the same.

when it starts properly then it fails upon restart with: $ ./BasiliskII Basilisk II V1.1 by Christian Bauer et al. Reading ROM file... Using SDL/pulseaudio audio output Using SDL_Renderer driver: opengl WARNING: No FSM present, disabling ExtFS Caught SIGSEGV at address 0x108645008 [IP=0x444406] D0: fffffefa D1: ffffffff D2: 0000000d D3: ffffff47 D4: 00000000 D5: ffffffff D6: 00000000 D7: 00000007 A0: 00000004 A1: 0000fe56 A2: 0000f6d8 A3: 00000008 A4: 0000f7d8 A5: 041111c4 A6: 0000f940 A7: 0000f5c4 USP=00000000 ISP=0000f5c4 MSP=00000000 VBR=00000000 T=00 S=1 M=0 X=0 N=1 Z=0 V=0 C=0 IMASK=0 FP0: nan FP1: nan FP2: nan FP3: nan FP4: nan FP5: nan FP6: nan FP7: nan N=0 Z=0 I=0 NAN=0 0000feb4: 03f9 c66a 0008 0000 fb9e BSET.B D1,$c66a0008 next PC: 0000feba

BasiliskII 1.1 compiled from git with default options. Disabling jit does not help. Changing the sdl render also does not help. Same ROM/image combination works fine with the BasiliskII 1.0 that ships with debian.

Updated debian bullseye Linux tux7 5.10.0-18-amd64 #1 SMP Debian 5.10.140-1 (2022-09-02) x86_64 GNU/Linux

[kanjitalk755]

It was not reproduced in the following environment.

Host: Debian 11.4 (x86_64) Guest: Mac OS J1-8.1, centris650.rom

It may be possible to fix the issue if the reproduction conditions are clarified.

[gorlik]

I tried to use gdb to narrow down the problem. Unfortunately, vosf seems to interfere with gdb and I can't get it to do anything useful. I disabled vosf and now under gdb the emulator never fails to start. However without gdb still intermittently fails with the same signature as above.

any recommendation on how I can help?

[gorlik]

I narrowed down the intermittent startup issue with a modified system ROM. Using a pristine IIsi ROM seems to work all the time. The same modified ROM works well on both BasiliskII 1.0 and a real Mac.

However, even with the pristine IIsi rom restarting fails with: Illegal instruction: 00e0 at 07fd1d56 Your Mac program just did something terribly stupid Caught SIGSEGV at address (nil) [IP=0x43eb00] D0: 4081e254 D1: 00001214 D2: fffffffe D3: 00000000 D4: 00000028 D5: 0000813a D6: 0000000a D7: 00011d24 A0: 8202000c A1: 00001e44 A2: 00010b78 A3: 00011820 A4: 40810000 A5: 82020006 A6: 00001d52 A7: 00001d28 USP=00000000 ISP=00001d28 MSP=00000000 VBR=00000000 T=00 S=1 M=0 X=0 N=1 Z=0 V=0 C=0 IMASK=0 FP0: nan FP1: nan FP2: nan FP3: nan FP4: nan FP5: nan FP6: nan FP7: nan N=0 Z=0 I=0 NAN=0 8202000c: 0000 0000 0000 0000 0000 OR.B #$00,D0 next PC: 82020010

[kanjitalk755]

Does that mean some ROMs start normally? It was also reported in #134 that there is a problem with restarting.

[gorlik]

The unmodified ROM behaves better and starts up most of the times. Right now, I am using a unmodified IIsi ROM and I disabled vosf and jit and still got a very rare hang on startup but I didn't capture the dump. The restart problem is very easy to reproduce.

[kanjitalk755]

Fixed. Please let me know if you can reproduce this issue with the latest version.