06371: schasercv: Crashes on reload (-str 8) in a staggered -str 20 run

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
06371	Save/Restore	Critical (emulator)	Always	Sep 5, 2016, 22:49	Sep 16, 2016, 07:26

Tester	Tafoid	View Status	Public	Platform	MAME (Official Binary)
Assigned To	Osso	Resolution	Fixed	OS	Windows Vista/7/8 (64-bit)
Status [?]	Resolved			Driver	midw8080/8080bw.cpp
Version	0.177	Fixed in Version	0.178	Build	Normal
		Fixed in Git Commit		Github Pull Request #

Summary	06371: schasercv: Crashes on reload (-str 8) in a staggered -str 20 run
Description	Exception at EIP=00000000026823a8 (discrete_device::write(address_space&, unsigned int, unsigned char, unsigned char)+0x0018): ACCESS VIOLATION While attempting to read memory at 0000000000000390 ----------------------------------------------------- Stack crawl: 0000000000228390: 00000000026823a8 (discrete_device::write(address_space&, unsigned int, unsigned char, unsigned char)+0x0018) 0000000000228420: 00000000009d5ac3 (_8080bw_state::schaser_reinit_555_time_remain()+0x0083) 00000000002284c0: 0000000002c15ab0 (save_manager::read_file(emu_file&)+0x01c0) 0000000000228910: 0000000002bdc26d (running_machine::handle_saveload()+0x044d) 0000000000228990: 0000000002bdfdb0 (running_machine::run(bool)+0x02e0) 000000000022f3b0: 000000000181efef (mame_machine_manager::execute()+0x015f) 000000000022f8b0: 00000000018833d1 (cli_frontend::execute(int, char)+0x0fa1) 000000000022f920: 000000000181dcc5 (emulator_info::start_frontend(emu_options&, osd_interface&, int, char)+0x0035) 000000000022fd60: 000000000177d3bb (utf8_main(int, char**)+0x012b) 000000000022fe50: 000000000300322c (wmain+0x018c) 000000000022ff20: 000000000040140c (__tmainCRTStartup+0x025c) 000000000022ff50: 000000000040153b (mainCRTStartup+0x001b) 000000000022ff80: 0000000076ab59bd (BaseThreadInitThunk+0x000d) 000000000022ffd0: 0000000076cea2e1 (RtlUserThreadStart+0x0021)
Steps To Reproduce	clear any nvram/sta files for schasercv == mame schasercv -autosave -str 4 let run and return to prompt == mame schasercv -autosave -str 8 crash happens
Additional Information
Github Commit

Flags
Regression Version	0.175
Affected Sets / Systems	schasercv

Attached Files

No.13115 NekoEd Senior Tester Sep 6, 2016, 02:40	Confirmed, SDLMAME64 0.177 on Linux/x64.