[Wayland-bugs] [Bug 105370] Dragging the palm across touchpad crashes : Assertion `tp->tap.nfingers_down >= 1' failed.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105370

Peter Hutterer <peter.hutterer at who-t.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |DUPLICATE
             Status|NEW                         |RESOLVED
                 CC|                            |peter.hutterer at who-t.net

--- Comment #4 from Peter Hutterer <peter.hutterer at who-t.net> ---
Looks like a dupe of bug 105258. There's still a bug warning replaying this but
it doesn't crash after 440d94be57.

> Physical Dimension of touchpad (the actual area, without including buttons)
> Width = 10.8 cm
> Height = 6.1 cm

please run the touchpad-edge-detector, this needs to be fixed in a hwdb entry.

> For a newbie, how would I go about patching this issue? What steps do you 
> usually follow with the log and evemu log?

basically: 
in one terminal: sudo evemu-play evemu.log file
in the other terminal: sudo ./build/libinput-debug-events --enalbe-tap

hit enter for evemu-play, watch libinput crash, warn, or sail along smoothly.
If the former, run in gdb to get an idea of what the context is (if needed, in
this case it's easy enough).

Isolate the event sequence that triggers the crash (where needed/possible).
Then stare at the evemu log long enough until it's clear why the crash happens.
Write a test case for libinput, then keep failing that until the bug is fixed
or a goat needs to be sacrificed [1], whichever happens earlier.


[1] no animals were harmed in the making of this software

*** This bug has been marked as a duplicate of bug 105258 ***

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