Intermittent crash on hotplugging monitors

[J0nnyMak0]

sway version 1.0-rc1-81-ga1e17108 (Feb 18 2019, branch 'master')

From time to time when I hotplug external monitors, I either get a system freeze or a crash. I was able get a trace this time.

gdb.txt

#0  0x00007f0916053660 in gbm_bo_get_user_data () at /usr/lib/libgbm.so.1
#1  0x00007f0916a5f1e9 in get_tex_for_bo (renderer=0x55ae57773488, bo=0x0) at ../subprojects/wlroots/backend/drm/renderer.c:203
        tex = 0x40
        attribs = {width = -442485344, height = 32767, format = 0, flags = 0, modifier = 0, n_planes = 380039049, offset = {32521, 0, 0, 0}, stride = {0, 1471040656, 21934, 1467430040}, fd = {21934, -442487440, 32767, 379973214}}
#2  0x00007f0916a5f2b7 in copy_drm_surface_mgpu (dest=0x55ae57774428, src=0x0) at ../subprojects/wlroots/backend/drm/renderer.c:225
        tex = 0x0
        __PRETTY_FUNCTION__ = "copy_drm_surface_mgpu"
        mat = {2.38220739e-44, 8.96831017e-44, 8.96831017e-44, 0, -9.45542631e+22, 4.59163468e-41, -9.45542631e+22, 4.59163468e-41, 0}
        renderer = 0x55ae57ae4c90
#3  0x00007f0916a5b767 in drm_connector_set_cursor (output=0x55ae578281b0, texture=0x0, scale=1, transform=WL_OUTPUT_TRANSFORM_NORMAL, hotspot_x=0, hotspot_y=0, update_texture=true) at ../subprojects/wlroots/backend/drm/drm.c:725
        conn = 0x55ae578281b0
        drm = 0x55ae57773380
        crtc = 0x55ae577737c0
        plane = 0x55ae577743e8
        hotspot = {x = 0, y = 0, width = 0, height = 0}
        bo = 0x0
        ok = 22
#4  0x00007f0916a9d44e in output_cursor_attempt_hardware (cursor=0x55ae57da5ac0) at ../subprojects/wlroots/types/wlr_output.c:727
        scale = 1
        transform = WL_OUTPUT_TRANSFORM_NORMAL
        texture = 0x0
        hwcur = 0x0
        __PRETTY_FUNCTION__ = "output_cursor_attempt_hardware"
#5  0x00007f0916a9d594 in wlr_output_cursor_set_image (cursor=0x55ae57da5ac0, pixels=0x0, stride=0, width=0, height=0, hotspot_x=0, hotspot_y=0) at ../subprojects/wlroots/types/wlr_output.c:764
        renderer = 0x55ae57764620
        __PRETTY_FUNCTION__ = "wlr_output_cursor_set_image"
#6  0x00007f0916a8bccd in wlr_cursor_set_image (cur=0x55ae57826540, pixels=0x0, stride=0, width=0, height=0, hotspot_x=0, hotspot_y=0, scale=0) at ../subprojects/wlroots/types/wlr_cursor.c:333
        output_scale = 1
        output_cursor = 0x55ae57dd15f0
#7  0x000055ae56c42f3a in cursor_set_image (cursor=0x55ae57853b50, image=0x0, client=0x0) at ../sway/input/cursor.c:1176
        current_image = 0x55ae56c766b3 "left_ptr"
#8  0x000055ae56c3b5a4 in seat_update_capabilities (seat=0x55ae5783ef70) at ../sway/input/seat.c:441
        caps = 2
        seat_device = 0x55ae5783f050
#9  0x000055ae56c3be80 in seat_remove_device (seat=0x55ae5783ef70, input_device=0x55ae57ab9280) at ../sway/input/seat.c:644
        seat_device = 0x55ae57a84120
#10 0x000055ae56c3954c in handle_device_destroy (listener=0x55ae57ab92a0, data=0x55ae57a85340) at ../sway/input/input-manager.c:441
        device = 0x55ae57a85340
        input_device = 0x55ae57ab9280
        __PRETTY_FUNCTION__ = "handle_device_destroy"
        seat = 0x55ae5783ef70
#11 0x00007f0916aace86 in wlr_signal_emit_safe (signal=0x55ae57a85380, data=0x55ae57a85340) at ../subprojects/wlroots/util/signal.c:29
        pos = 0x55ae57ab92a0
        l = 0x55ae57ab92a0
        cursor = {link = {prev = 0x55ae57ab92a0, next = 0x7fffe5a03130}, notify = 0x7f0916aacdd0 <handle_noop>}
        end = {link = {prev = 0x7fffe5a03110, next = 0x55ae57a85380}, notify = 0x7f0916aacdd0 <handle_noop>}
#12 0x00007f0916a941d3 in wlr_input_device_destroy (dev=0x55ae57a85340) at ../subprojects/wlroots/types/wlr_input_device.c:34
#13 0x00007f0916a6274e in handle_device_removed (backend=0x55ae575d5230, libinput_dev=0x55ae57e44480) at ../subprojects/wlroots/backend/libinput/events.c:214
        wlr_devices = 0x55ae57e43a90
        vendor = 2
        product = 7
        name = 0x55ae57e43580 "SynPS/2 Synaptics TouchPad"
        dev = 0x55ae57a85340
        tmp_dev = 0x55ae57e43a38
#14 0x00007f0916a629f1 in handle_libinput_event (backend=0x55ae575d5230, event=0x55ae57e49b80) at ../subprojects/wlroots/backend/libinput/events.c:234
        libinput_dev = 0x55ae57e44480
        event_type = LIBINPUT_EVENT_DEVICE_REMOVED
#15 0x00007f0916a61849 in handle_libinput_readable (fd=34, mask=1, _backend=0x55ae575d5230) at ../subprojects/wlroots/backend/libinput/backend.c:41
        backend = 0x55ae575d5230
        event = 0x55ae57e49b80
#16 0x00007f09163aa702 in wl_event_loop_dispatch () at /usr/lib/libwayland-server.so.0
#17 0x00007f09163a92ac in wl_display_run () at /usr/lib/libwayland-server.so.0
#18 0x000055ae56c2cffb in server_run (server=0x55ae56c8dd40 <server>) at ../sway/server.c:212
#19 0x000055ae56c2c544 in main (argc=1, argv=0x7fffe5a035a8) at ../sway/main.c:403
        verbose = 0
        debug = 0
        validate = 0
        allow_unsupported_gpu = 0
        long_options = {{name = 0x55ae56c74e70 "help", has_arg = 0, flag = 0x0, val = 104}, {name = 0x55ae56c74e75 "config", has_arg = 1, flag = 0x0, val = 99}, {name = 0x55ae56c74e7c "validate", has_arg = 0, flag = 0x0, val = 67}, {name = 0x55ae56c74e85 "debug", has_arg = 0, flag = 0x0, val = 100}, {name = 0x55ae56c74e8b "version", has_arg = 0, flag = 0x0, val = 118}, {name = 0x55ae56c74e93 "verbose", has_arg = 0, flag = 0x0, val = 86}, {name = 0x55ae56c74e9b "get-socketpath", has_arg = 0, flag = 0x0, val = 112}, {name = 0x55ae56c74eaa "unsupported-gpu", has_arg = 0, flag = 0x0, val = 117}, {name = 0x55ae56c74eba "my-next-gpu-wont-be-nvidia", has_arg = 0, flag = 0x0, val = 117}, {name = 0x0, has_arg = 0, flag = 0x0, val = 0}}
        config_path = 0x0
        usage = 0x55ae56c74938 "Usage: sway [options] [command]\n\n  -h, --help", ' ' <repeats 13 times>, "Show help message and quit.\n  -c, --config <config>  Specify a config file.\n  -C, --validate         Check the validity of the config file, th"...
        c = -1