testing Weston Wayland compositor on FreeBSD without Xorg

I'm trying to run Weston port:

https://reviews.freebsd.org/D10599

on a machine (let's say "host A") with and without using Xorg.
I'm using approach previously described by Greg:

https://lists.freebsd.org/pipermail/freebsd-x11/2018-July/021414.html

It works on the host A if launched under Xorg.
The same approach works on host B (drm-next-kmod, Intel drivers)
from under Xorg *and* via weston-launch.

It does not work on the host A if launched directly i.e. "% weston-launch".

The host A is:

% uname -a
FreeBSD AmaDeuS 11.2-RELEASE-p1 FreeBSD 11.2-RELEASE-p1 #0: Sun Aug 12 
19:40:55 JST 2018     denis@AmaDeuS:/usr/obj/usr/src/sys/AMADEUS  amd64
% pkg info | egrep "drm|gpu|mesa"
drm-next-kmod-4.11.g20180619
gpu-firmware-kmod-g20180319_1
libdrm-2.4.92,1
mesa-dri-18.1.2
mesa-libs-18.1.2

% kldstat -v | grep 0x
  1   83 0xffffffff80200000 203e7f0  kernel (/boot/kernel/kernel)
  2    1 0xffffffff82240000 5e80     ichsmb.ko (/boot/kernel/ichsmb.ko)
  3    3 0xffffffff82246000 2d10     smbus.ko (/boot/kernel/smbus.ko)
  4    1 0xffffffff82249000 2da0     smb.ko (/boot/kernel/smb.ko)
  5    1 0xffffffff82421000 20b2d8   amdgpu.ko (/boot/modules/amdgpu.ko)
  6    1 0xffffffff8262d000 bb4f0    drm.ko (/boot/modules/drm.ko)
  7    4 0xffffffff826e9000 edc8     linuxkpi.ko (/boot/kernel/linuxkpi.ko)
  8    3 0xffffffff826f8000 164a1    linuxkpi_gplv2.ko 
(/boot/modules/linuxkpi_gplv2.ko)
  9    2 0xffffffff8270f000 9e8      debugfs.ko (/boot/modules/debugfs.ko)
10    1 0xffffffff82710000 8158     amdgpu_polaris11_mc_bin.ko 
(/boot/modules/amdgpu_polaris11_mc_bin.ko)
11    1 0xffffffff82719000 4400     amdgpu_polaris11_pfp_bin.ko 
(/boot/modules/amdgpu_polaris11_pfp_bin.ko)
12    1 0xffffffff8271e000 4400     amdgpu_polaris11_me_bin.ko 
(/boot/modules/amdgpu_polaris11_me_bin.ko)
13    1 0xffffffff82723000 2400     amdgpu_polaris11_ce_bin.ko 
(/boot/modules/amdgpu_polaris11_ce_bin.ko)
14    1 0xffffffff82726000 5c10     amdgpu_polaris11_rlc_bin.ko 
(/boot/modules/amdgpu_polaris11_rlc_bin.ko)
15    1 0xffffffff8272c000 40400    amdgpu_polaris11_mec_bin.ko 
(/boot/modules/amdgpu_polaris11_mec_bin.ko)
16    1 0xffffffff8276d000 40400    amdgpu_polaris11_mec2_bin.ko 
(/boot/modules/amdgpu_polaris11_mec2_bin.ko)
17    1 0xffffffff827ae000 3318     amdgpu_polaris11_sdma_bin.ko 
(/boot/modules/amdgpu_polaris11_sdma_bin.ko)
18    1 0xffffffff827b2000 3320     amdgpu_polaris11_sdma1_bin.ko 
(/boot/modules/amdgpu_polaris11_sdma1_bin.ko)
19    1 0xffffffff827b6000 5bc00    amdgpu_polaris11_uvd_bin.ko 
(/boot/modules/amdgpu_polaris11_uvd_bin.ko)
20    1 0xffffffff82812000 28d20    amdgpu_polaris11_vce_bin.ko 
(/boot/modules/amdgpu_polaris11_vce_bin.ko)
21    1 0xffffffff8283b000 1fe18    amdgpu_polaris11_smc_bin.ko 
(/boot/modules/amdgpu_polaris11_smc_bin.ko)
22    1 0xffffffff8285b000 27a0     ums.ko (/boot/kernel/ums.ko)
23    1 0xffffffff8285e000 1780     uhid.ko (/boot/kernel/uhid.ko)
24    1 0xffffffff82860000 3698     ng_ubt.ko (/boot/kernel/ng_ubt.ko)
25    5 0xffffffff82864000 9a20     netgraph.ko (/boot/kernel/netgraph.ko)
26    1 0xffffffff8286e000 8e78     ng_hci.ko (/boot/kernel/ng_hci.ko)
27    3 0xffffffff82877000 95c      ng_bluetooth.ko 
(/boot/kernel/ng_bluetooth.ko)
28    1 0xffffffff82878000 bc0e     ng_l2cap.ko (/boot/kernel/ng_l2cap.ko)
29    1 0xffffffff82884000 176a8    ng_btsocket.ko 
(/boot/kernel/ng_btsocket.ko)
30    1 0xffffffff8289c000 1d40     ng_socket.ko (/boot/kernel/ng_socket.ko)

What exactly happend when I execute "weston-launch":

... skipped
[22:00:05.026] GL ES 2 renderer features:
                read-back format: BGRA
                wl_shm sub-image to texture: yes
                EGL Wayland extension: yes
[22:00:05.037] input device 'System mouse', /dev/input/event0 is tagged 
by udev as: Mouse
[22:00:05.037] input device 'System mouse', /dev/input/event0 is a 
pointer caps
[22:00:05.037] input device 'System keyboard multiplexer', 
/dev/input/event1 is tagged by udev as: Keyboard
[22:00:05.037] input device 'System keyboard multiplexer', 
/dev/input/event1 is a keyboard
[22:00:05.038] input device 'AT keyboard', /dev/input/event2 is tagged 
by udev as: Keyboard
[22:00:05.038] input device 'AT keyboard', /dev/input/event2 is a keyboard
[22:00:05.038] input device 'Dexin Corp. 2.4GHz Keyboardmouse set 
01242013A, class 0/0, rev 1.10/8.2c, addr ', /dev/input/event3 is tagged 
by udev as: Keyboard
[22:00:05.038] input device 'Dexin Corp. 2.4GHz Keyboardmouse set 
01242013A, class 0/0, rev 1.10/8.2c, addr ', /dev/input/event3 is a keyboard
weston-launch: opened /dev/dri/card0: ret: 0, fd: 4
weston-launch: opened /dev/input/event0: ret: 0, fd: 6
weston-launch: opened /dev/input/event1: ret: 0, fd: 7
weston-launch: opened /dev/input/event2: ret: 0, fd: 8
weston-launch: opened /dev/input/event3: ret: 0, fd: 9
handle_signal: SIGCHLD

If I load generated weston.core into debugger I can see that
all threads of weston process stopped by SIGBUS

Xorg works OK on the host A.
If I compare log output of successful launch of weston on the "host B" I 
can guess that something bad happen on the "host A" just before this line:
[22:18:45.420] Registered plugin API 'weston_drm_output_api_v1' of size 24

Question: how to debug this kind of problem?

Regards,
Denis

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