| Summary: | Enabling button scrolling on L/R with middle button emulation enabled triggers a bug | ||
|---|---|---|---|
| Product: | Wayland | Reporter: | Peter Hutterer <peter.hutterer> |
| Component: | libinput | Assignee: | Wayland bug list <wayland-bugs> |
| Status: | RESOLVED FIXED | QA Contact: | |
| Severity: | normal | ||
| Priority: | medium | CC: | peter.hutterer |
| Version: | unspecified | ||
| Hardware: | Other | ||
| OS: | All | ||
| Whiteboard: | |||
| i915 platform: | i915 features: | ||
| Bug Depends on: | 94856 | ||
| Bug Blocks: | |||
Given d76263a00fc0b82906043c276d93b7081f6ab81e, we've basically committed to not using middle button emulation and scroll button on the same button anyway, so the fix for this race condition is to not allow both on the same button instead of relying on undefined behaviour. commit e43f9da9ecea6d17100c0012a89f5d162b2d7d7b Author: Peter Hutterer <peter.hutterer@who-t.net> Date: Mon Feb 20 09:14:42 2017 +1000 evdev: allow button scrolling on the L/R button with middle emulation active Here are the update to all players online just visit here http://mahjongfreegames.online/dark-dimensions and play the amazing Play free mahjong dark dimensions online. |
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Enabling button scrolling on the left or right button with middle button emulation enabled triggers a timer bug assertion in libinput. Cause is that once the middle button expires, it sends the button event with the original event timestamp (but delayed by the timeout). That feeds into the scroll button emulation code which triggers the next timer for the scroll expiry, based on the event timestamp. That triggers the assertion in the timer system because it checks the current time against the event timestamp (which is now in the past). Output from the test suite: litest debug: event18: tagged as LIBINPUT_MODEL_TRACKBALL litest debug: event18: tagged as LIBINPUT_MODEL_LOGITECH_MARBLE_MOUSE litest debug: event18: tagged as ID_INPUT_TRACKBALL litest info: input device 'litest Logitech USB Trackball', /dev/input/event18 is tagged by udev as: Mouse Trackball litest info: input device 'litest Logitech USB Trackball', /dev/input/event18 is a pointer caps litest debug: middlebuttonstate: MIDDLEBUTTON_IDLE → MIDDLEBUTTON_EVENT_L_DOWN → MIDDLEBUTTON_LEFT_DOWN, rc 1 litest error: libinput bug: timer offset negative (-100109) FAILED: aborting libinput bug triggered, aborting. in litest_log_handler() (litest.c:803) Backtrace: 0: litest_fail_condition() (.today/libinput/test/litest.c:284) 1: litest_log_handler() (.today/libinput/test/litest.c:804) 2: /home/whot/tmp/today/libinput/src/.libs/libinput.so.10 (log_msg_va+0x52) [0x7fab423f5206] 3: /home/whot/tmp/today/libinput/src/.libs/libinput.so.10 (log_msg+0xba) [0x7fab423f52c3] 4: /home/whot/tmp/today/libinput/src/.libs/libinput.so.10 (libinput_timer_set+0x5c) [0x7fab4241d6c0] 5: /home/whot/tmp/today/libinput/src/.libs/libinput.so.10 (evdev_button_scroll_button+0x53) [0x7fab423fda3c] 6: /home/whot/tmp/today/libinput/src/.libs/libinput.so.10 (evdev_pointer_notify_button+0x4a) [0x7fab423fdb28] 7: /home/whot/tmp/today/libinput/src/.libs/libinput.so.10 (middlebutton_post_event+0x2c) [0x7fab42405246] 8: /home/whot/tmp/today/libinput/src/.libs/libinput.so.10 (evdev_middlebutton_ldown_handle_event+0x14d) [0x7fab42405423] 9: /home/whot/tmp/today/libinput/src/.libs/libinput.so.10 (evdev_middlebutton_handle_event+0x87) [0x7fab42405b8f] 10: /home/whot/tmp/today/libinput/src/.libs/libinput.so.10 (evdev_middlebutton_handle_timeout+0x38) [0x7fab42405f26] 11: /home/whot/tmp/today/libinput/src/.libs/libinput.so.10 (libinput_timer_handler+0x110) [0x7fab4241d8d7] 12: /home/whot/tmp/today/libinput/src/.libs/libinput.so.10 (libinput_dispatch+0xbe) [0x7fab423f8e10] 13: litest_button_scroll() (.today/libinput/test/litest.c:2094) 14: pointer_scroll_button() (.today/libinput/test/test-pointer.c:999) 15: /lib64/libcheck.so.0 (srunner_run+0x869) [0x7fab42839db9] 16: litest_run_suite() (.today/libinput/test/litest.c:945) 17: litest_run() (.today/libinput/test/litest.c:998) 18: main() (.today/libinput/test/litest.c:3581) 19: /lib64/libc.so.6 (__libc_start_main+0xf1) [0x7fab412ed401] 20: ./test/libinput-test-suite-runner (_start+0x2a) [0x40980a] 21: ? (?+0x2a) [0x2a]