[Bug] ymdk_np21 works unreliably after update

[gudvinr]

I used some older version of QMK for probably a year or so and decided to upgrade recently.
Everything worked without issues before update but then suddenly I have multiple problems with QMK.

I didn't pay attention to which version was working because I didn't think I could get malfunctioning keyboard after update.

Describe the Bug

1. When I press any configured key (e.g. C(KC_F13), C(KC_V) and both tapdance actions for ACTION_TAP_DANCE_DOUBLE(S(KC_F16), C(S(KC_F16))) are ones that I use often) it can sometimes be ignore.
   I don't see any correlation with time between keypresses in any case.
2. Sometimes I get multiple events fired. For example. one of the keys is A(KC_F4) and it could just happily wipe out all the windows I have.

System Information

• Keyboard: ymdk_np21
• Operating system: Arch Linux
• AVR GCC version: one inside qmkfm/qmk_cli container

• ARM GCC version: one inside qmkfm/qmk_cli container

• QMK Firmware version:
  • 0.15.3-b98280bf5 right now
  • noticed at 0.14.32 (-ish)
  • got keyboard at 2020-06-02 so not older than that

• Any keyboard related software installed?
  No

Additional information

config.h diff

+#define TAPPING_TOGGLE 3
+#define TAPPING_TERM   175

rules.mk diff

-BACKLIGHT_ENABLE = yes      # Enable keyboard backlight functionality
-RGBLIGHT_ENABLE = yes       # Enable keyboard RGB underglow
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow
 
-LAYOUTS = ortho_6x4 numpad_6x4
+LAYOUTS = ortho_6x4
+KEY_LOCK_ENABLE = yes
+TAP_DANCE_ENABLE=yes

dmesg

I also looked to dmesg and I see messages like that:
usb 1-4.3: reset low-speed USB device number 12 using xhci_hcd

This device is indeed that keyboard:

Bus 001 Device 012: ID 594d:5021 YMDK NP21

/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/16p, 480M
    ID 1d6b:0002 Linux Foundation 2.0 root hub
    |__ Port 4: Dev 11, If 0, Class=Hub, Driver=hub/4p, 480M
        ID 05e3:0610 Genesys Logic, Inc. Hub
        |__ Port 3: Dev 12, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M
            ID 594d:5021  
        |__ Port 3: Dev 12, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
            ID 594d:5021

This keyboard plugged in USB3.0 hub which is plugged into USB3.0 port. I cannot test it with 2.0 port because I don't have neither USB2.0 ports nor USB2.0 hub.

[gudvinr]

So I did some git bisect and found out that issue started to happen (if it is indeed caused by qmk) before 0.14.3 because 0.14.3 produces this error. Looking at the date, good release was 0.8.141

However, it's impossible to build image with util/docker_build.sh because container produces an error about missing python packages and docker images in registry are not tagged properly.

Also still happens as of 0.19.10

Flashed ps2avrGB and kb doesn't do that with this firmware, which was what they had originally.

[gudvinr]

I finally got some time to debug this, built qmkfm/base_container at 9fc31b63ac2ef521853438aaba577852cf4701af and found out through bisect that c66df16 is the first bad commit. Thus 0.10.54 is the latest working release.

@noroadsleft it looks like your commit and seems rather large

[noroadsleft]

I have a commitment this morning, but I should be able to investigate this in the afternoon. (It's 8:21 AM local time right now.)

[gudvinr]

I mean, I can wait a bit more since I was able to cope with that for more than a year, lol. It's not an urgent matter at all.

[gudvinr]

So, I did some more digging, since this commit looks like it was merged squashed from PR #11053, I did bisect from 0.10.54 to pre-develop-merge-nov20 and pinpoint first bad commit there:
75a18e6 is the first bad commit

It appears to be the same issue as #11389

[drashna]

Considering that the atomic block commit may be the issue, does adding #define IGNORE_ATOMIC_BLOCK to your config.h fix the issue?

[gudvinr]

Yes, with this workaround I no longer see the issue but I don't think that this is a fix if users need to add this themselves for each board. This bug is rather obscure so it is kinda tricky to figure this out.
There should be more general approach.