Determinism issues possibly due to frontend issues

[nattthebear]

This is a lot of tickets, and by gathering them all together here I'm not stating with certainty that all of them are the same issue, or even that all of them are frontend issues. The truth is always more nuanced than that. But this is a lot of issues, all of them recently created. A small number of users reported most of them, suggesting that those users may inadvertently "trigger" things with their style of usage. Some of the referenced cores haven't seen any major work in a long time, so it seems unlikely that those cores are broken.

I want to investigate and fix core determinism issues, but the water is very muddy right now.

Possible desyncs caused by frontend:

• #3417
  • REPRO'D AND FIXED!
• #2738
  • REPRO'D AND FIXED!
• #2560
  • REPRO'D AND FIXED!
• #2523
  • not enough detail
• #2496
  • not enough detail, leaving open because there might be a real bug in MAME core
• #2473
  • mGBA in 2.4.2, waiting on user outdated build
• #2469
  • movie uses autofire, but leaving open due to 'randomizeinitialstate' discussion new issue opened for randomize, this one is closed
• #2470
  • many NES + 2 SNES + 1 PSX, user is adamant repro is easy and never provided a video recording when asked movies used autofire in effected builds, fixed
• #2438
  • NesHawk in 2.6, not TAStudio but "Record From: Now" autofire and SRAM issues in effected builds, fixed
• #2406, #2452
  • GBHawk movies used autofire in effected builds, fixed
• #2388
  • REPRO'D AND FIXED!
• #2384
  • adelikat said no-one uses this feature anyway Fixed
• Octoshock

  • 3090

    • 2.8 dev, w/ TAStudio

  • 2849

    • 2.6.3 dev, w/ TAStudio

  • 2830

    • 2.6.2, w/o TAStudio

  • 2743

    • w/ TAStudio

  • 2598

    • maybe w/o TAStudio

  • 2540

    • w/ TAStudio

  • 2214

    • maybe w/o TAStudio

Planned improvements to file management in frontend:

• 2484

• 2437

• 3061

Desyncs through unrelated, but known, causes:

• 2498

[YoshiRulz]

This makes a lot of sense actually. I think #2484 should be priority number 1 for 2.7.

edit: s/2.6.1/2.7/, can't always get what you want edit edit: sadly this isn't going to make 2.8 and I doubt it'll make 2.8.1

[ThunderAxe31]

Please include this in the list: https://github.com/TASVideos/BizHawk/issues/2214

[nattthebear]

Please include this in the list: #2214

Agreed and done. Since that ticket has a whole lot of "not sure, can't reproduce" in it, it might be frontend issues.