08615: mk4: Mortal Kombat 4 access violates running a benchmark, with -str 80 -norc -nothrottle switches

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08615	Crash/Freeze	Major	Always	Apr 27, 2023, 00:28	May 9, 2023, 12:46

Tester	john_iv	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows 10/11 (64-bit)
Status [?]	Acknowledged			Driver	midway/midzeus.cpp
Version	0.254	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	08615: mk4: Mortal Kombat 4 access violates running a benchmark, with -str 80 -norc -nothrottle switches
Description	Attempting to run video and sound benchmarks (vs. a simple -bench) I used the following command and see Mortal Kombat 4 access violate before the number of emulated seconds elapses. Interestingly, it doesn't AV if I use 60 emulated seconds. Be sure to use -norc to take any errant mame.ini settings out of the mix. mame mk4 -str 80 -nothrottle -norc c32boot.bin ROM NEEDS REDUMP WARNING: the machine might not run correctly. ----------------------------------------------------- Exception at EIP=00007ff7a220cdf2 (not found): ACCESS VIOLATION While attempting to read memory at 00000213dcd25e40 ----------------------------------------------------- RAX=000000008000bc00 RBX=000002135cd1a240 RCX=000002135cd1a240 RDX=000000008000bc00 RSI=000002135c12b2c0 RDI=0000000000000053 RBP=0000000000000000 RSP=00000064e1fffa58 R8=0000000000000000 R9=00000000c0005e00 R10=00000000546c6148 R11=000002135cf2518e R12=0000000000000100 R13=0000000000000000 R14=0000000000000001 R15=00000000ff8000bc ----------------------------------------------------- Stack crawl: 00000064e1fffa50: 00007ff7a220cdf2 (not found) 00000064e1f
Steps To Reproduce	1. Use the following commandline on x64 mame.exe. 2. mame mk4 -str 80 -nothrottle -norc 3. Observe abrupt early end to the benchmark with an access violation, as above.
Additional Information	Using the -bench switch for the same amount of time does not AV it. mame mk4 -bench 80 -norc System: i7-12700K @ 5.2Ghz OS: Win11 x64 22H2 (22621.1635) RAM: 64GB DDR5 5200MHz Video Card: AMD Radeon 5600XT
Github Commit

Flags
Regression Version
Affected Sets / Systems	mk4

Attached Files

No.21360 Robbbert Senior Tester Apr 27, 2023, 08:35	Unable to confirm, no crash here. Your dump is missing the symbols so there's no clue what caused it.
No.21364 Tafoid Administrator Apr 27, 2023, 18:18 edited on: Apr 27, 2023, 19:00	It crashes on my release builds starting with 0.252 - but for me it either shows nothing and drops to console/terminal window. I tried the daily builds I have and none of them seem to trigger a crash at all. The immediate conclusion is there may be a GCC issue - or something uninit'd - which started showing with the 0.252 release build. May also be something global changed during the extended dev time between 0.251/0.252, but that would take a bit more investigation.
No.21366 john_iv Senior Tester Apr 27, 2023, 19:32	I downloaded .254 mamedev.org release and put the .exe and the .sym file in my MAME directory per Robbbert and tried to repro this issue, and it didn't repro. I moved the .sym file out of the directory and then it AV'ed again. I don't know enough about programming to know what the presence or non-presence of the sym file interacting would have.
No.21372 Fujix Administrator Apr 30, 2023, 07:37	It works and quits normally here. mame mk4 -str 80 -norc -nothrottle c32boot.bin ROM NEEDS REDUMP WARNING: the machine might not run correctly. Average speed: 332.80% (79 seconds)
No.21424 Tafoid Administrator May 9, 2023, 12:46	This could be something un-init'd or some other weirdness. Acknowledging for now.