Created attachment 100519 [details] gdb stacktrace Tested on ubuntu 13.10 64bit dell xps 13 cypress touchpad weston: 6d1d1121a58b19db6e4a60939cbede1fed3d93e2 wayland: 3de6a1de3f860fdb4e0eb8c09e9a868295f44643 pixman: 9cd283b2eb8279824406bfd47b020d21fc00cf82 mesa: dfd117b8570a69a429e660c069997e78b181ab6d cairo: ead5c7909f3db1d0d81121fc2775c458871891b2 mesa/drm: 8fc62ca8ac010659023bb63c4759eb683de4f9af Steps to reproduce: 1. start weston 2. start weston-dnd 3. click quickly on flowers 4. SIGSEGV in data_device_start_drag (stack trace below) due to (seat->touch == NULL) gdb-stacktrace: #0 data_device_start_drag (client=0x8bbb40, resource=0x8b98e0, source_resource=0x9099a0, origin_resource=0x8cd630, icon_resource=0x90abe0, serial=355) at src/data-device.c:656 #1 0x00007ffff67bbadc in ffi_call_unix64 () from /usr/lib/x86_64-linux-gnu/libffi.so.6 #2 0x00007ffff67bb40c in ffi_call () from /usr/lib/x86_64-linux-gnu/libffi.so.6 #3 0x00007ffff7bd377a in wl_closure_invoke (closure=<optimized out>, flags=<optimized out>, target=0x8b98e0, opcode=0, data=0x8bbb40) at src/connection.c:936 #4 0x00007ffff7bcfcae in wl_client_connection_data (fd=<optimized out>, mask=<optimized out>, data=0x8bbb40) at src/wayland-server.c:333 #5 0x00007ffff7bd1c22 in wl_event_loop_dispatch (loop=0x628240, timeout=timeout@entry=-1) at src/event-loop.c:419 #6 0x00007ffff7bd0265 in wl_display_run (display=display@entry=0x6281b0) at src/wayland-server.c:969 #7 0x0000000000407a24 in main (argc=1, argv=<optimized out>) at src/compositor.c:4316 Error is 100% reproducible on both x11 and drm backend
Possible fix sent to mailing list http://lists.freedesktop.org/archives/wayland-devel/2014-June/015350.html In case it is important. Cypress touchpad was used for input.
Marking as fixed, in Weston master: commit 8202d72054575bea0cd20cb252c119cac6b12561 Author: Jason Ekstrand <jason.ekstrand@intel.com> Date: Tue Jun 24 21:19:24 2014 -0700 data-device: Clean up the logic in start_drag Previoiusly, we had a mess of logic that was repeated with one of the repeats negated. Not only was this unnecisaraly confusing, but it segfaulted and one of the negations was wrong. This cleans the whole mess up and should fix bug #79725.
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