06326: megadriv, 32x and clones, some segac2.c sets: Selecting machine and game via softlist though internal menu results exception/crash

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
06326	Crash/Freeze	Critical (emulator)	Always	Jul 27, 2016, 15:36	Jul 29, 2016, 16:12

Tester	Zaghadka	View Status	Public	Platform	MESS (Official Binary)
Assigned To	Osso	Resolution	Fixed	OS	Windows 10 (64-bit)
Status [?]	Resolved			Driver	sega/mdconsole.cpp
Version	0.176	Fixed in Version	0.177	Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	06326: megadriv, 32x and clones, some segac2.c sets: Selecting machine and game via softlist though internal menu results exception/crash
Description	In the Genesis, NTSC driver, Sonic the Hedgehog 2 and Sonic the Hedgehog 3 crash to desktop. When Sonic 2, World Rev. A is run with Mega drive, Europe it succeeds. Mega Drive, Japan crashes. When Sonic 3 is run with any driver, it crashes. This may affect more Genesis/Mega Drive games, but I'm getting CTDs on various Sonic sets. I am using HLSL with NTSC processing turned on. Turning off HLSL does not help, though.
Steps To Reproduce	Launch Sonic the Hedgehog games with various Mega Drive/Genesis drivers. mame genesis flicky should be enough to verify exception
Additional Information	Likely GCC 6.1.0 related Exception at EIP=0000000002b2ec33 (ioport_port::read()+0x0023): ACCESS VIOLATION While attempting to read memory at 0000000000000029 Stack crawl: 0000000000228840: 0000000002b2ec33 (ioport_port::read()+0x0023) 0000000000228910: 0000000000c3e701 (md_cons_state::screen_eof_console(screen_device&, bool)+0x0021) 0000000000228970: 0000000002b86736 (screen_device::vblank_begin()+0x00e6) 00000000002289e0: 0000000002b8a3e5 (screen_device::device_timer(emu_timer&, unsigned int, int, void)+0x0275) 0000000000228a80: 0000000002b802c9 (device_scheduler::timeslice()+0x0479) 0000000000228b00: 0000000002b4a5d8 (running_machine::run(bool)+0x01a8) 000000000022f440: 00000000017df41f (mame_machine_manager::execute()+0x015f) 000000000022f8c0: 000000000183b384 (cli_frontend::execute(int, char)+0x0e04) 000000000022f930: 00000000017de4c5 (emulator_info::start_frontend(emu_options&, osd_interface&, int, char)+0x0035) 000000000022fd70: 00000000017409bb (utf8_main(int, char*)+0x012b) 000000000022fe50: 0000000002f6453c (wmain+0x018c) 000000000022ff20: 000000000040140c (__tmainCRTStartup+0x025c) 000000000022ff50: 000000000040153b (mainCRTStartup+0x001b) 000000000022ff80: 00000000774559bd (BaseThreadInitThunk+0x000d) 000000000022ffd0: 000000007768a2e1 (RtlUserThreadStart+0x0021)
Github Commit

Flags
Regression Version	0.176
Affected Sets / Systems	megadriv, 32x and clones, some segac2.c sets

Attached Files

No.12983 Zaghadka Tester Jul 27, 2016, 15:39	Okay, it happens with Alisia Dragoon (USA) on Genesis, USA NTSC as well. There seems to be a problem with the driver. I am launching these games from the GUI through the software list picker.
No.12984 Zaghadka Tester Jul 27, 2016, 15:42	I also checked the games with Mame 0.175. They work in that version, so the regression is at 0.176.
No.12991 Tafoid Administrator Jul 28, 2016, 01:14 edited on: Jul 28, 2016, 01:22	I can confirm with those using GCC 6.1.0 only (mamedev.org's release) and those who are using GCC 5.4.0 or earlier don't seem to be having this issue. It appears to affect most all megadriv.cpp drivers to various extents.