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Crash in rendering (wlr_egl_swap_buffers)

I'm not sure if this is phosh or Mesa, or something else. Anyway, what I did is run qemu, open kgx, connect via ssh a couple times, and run https://source.puri.sm/dorota.czaplejewicz/phosh/commits/layers a couple of times. When killing it, this happened:

purism@pureos:~$ coredumpctl -1 debug
Hint: You are currently not seeing messages from other users and the system.
      Users in groups 'adm', 'systemd-journal' can see all messages.
      Pass -q to turn off this notice.
           PID: 361 (phoc)
           UID: 1000 (purism)
           GID: 1000 (purism)
        Signal: 11 (SEGV)
     Timestamp: Wed 2019-09-18 11:36:00 UTC (52s ago)
  Command Line: /usr/bin/phoc -C /usr/share/phosh/rootston.ini -E bash -lc 'gnome-session --disable-acceleration-check --session=phosh'
    Executable: /usr/bin/phoc
 Control Group: /user.slice/user-1000.slice/session-1.scope
          Unit: session-1.scope
         Slice: user-1000.slice
       Session: 1
     Owner UID: 1000 (purism)
       Boot ID: 1c7ff308b004432997919d96dbcbe5d6
    Machine ID: 708e68dddc194663bf1ebaf795baad61
      Hostname: pureos
       Storage: /var/lib/systemd/coredump/core.phoc.1000.1c7ff308b004432997919d96dbcbe5d6.361.1568806560000000.lz4
       Message: Process 361 (phoc) of user 1000 dumped core.
                
                Stack trace of thread 361:
                #0  0x00007f0b6ad7e454 n/a (n/a)
                #1  0x00007f0b6854c7f7 n/a (kms_swrast_dri.so)
                #2  0x00007f0b6854db79 n/a (kms_swrast_dri.so)
                #3  0x00007f0b6854bed5 n/a (kms_swrast_dri.so)
                #4  0x00007f0b6854c854 n/a (kms_swrast_dri.so)
                #5  0x00007f0b68557471 n/a (kms_swrast_dri.so)
                #6  0x00007f0b68557fa3 n/a (kms_swrast_dri.so)
                #7  0x00007f0b688d2faf n/a (kms_swrast_dri.so)
                #8  0x00007f0b684adaba n/a (kms_swrast_dri.so)
                #9  0x00007f0b6478b38d n/a (libEGL_mesa.so.0)
                #10 0x00007f0b6477c8c6 eglSwapBuffers (libEGL_mesa.so.0)
                #11 0x000055700c69ca00 wlr_egl_swap_buffers (phoc)
                #12 0x000055700c68f4a1 swap_drm_surface_buffers (phoc)
                #13 0x000055700c68d4cc drm_connector_commit (phoc)
                #14 0x000055700c6be6ee wlr_output_commit (phoc)
                #15 0x000055700c67b722 output_render (phoc)
                #16 0x000055700c6c95bc wlr_signal_emit_safe (phoc)
                #17 0x000055700c6c95bc wlr_signal_emit_safe (phoc)
                #18 0x000055700c68b64b page_flip_handler (phoc)
                #19 0x00007f0b6a6c7e65 drmHandleEvent (libdrm.so.2)
                #20 0x000055700c68e955 handle_drm_event (phoc)
                #21 0x00007f0b6a7c4b72 wl_event_loop_dispatch (libwayland-server.so.0)
                #22 0x000055700c678c17 wayland_event_source_dispatch (phoc)
                #23 0x00007f0b6aa47f2e g_main_dispatch (libglib-2.0.so.0)
                #24 0x00007f0b6aa481c8 g_main_context_iterate (libglib-2.0.so.0)
                #25 0x00007f0b6aa484c2 g_main_loop_run (libglib-2.0.so.0)
                #26 0x000055700c671a0f main (phoc)
                #27 0x00007f0b6a2e009b __libc_start_main (libc.so.6)
                #28 0x000055700c671baa _start (phoc)
                
                Stack trace of thread 411:
                #0  0x00007f0b6a3aa819 __poll (libc.so.6)
                #1  0x00007f0b6aa48136 g_main_context_poll (libglib-2.0.so.0)
                #2  0x00007f0b6aa4825c g_main_context_iteration (libglib-2.0.so.0)
                #3  0x00007f0b6aa482a1 glib_worker_main (libglib-2.0.so.0)
                #4  0x00007f0b6aa70415 g_thread_proxy (libglib-2.0.so.0)
                #5  0x00007f0b69ba5fa3 start_thread (libpthread.so.0)
                #6  0x00007f0b6a3b54cf __clone (libc.so.6)
                
                Stack trace of thread 412:
                #0  0x00007f0b6a3aa819 __poll (libc.so.6)
                #1  0x00007f0b6aa48136 g_main_context_poll (libglib-2.0.so.0)
                #2  0x00007f0b6aa4825c g_main_context_iteration (libglib-2.0.so.0)
                #3  0x00007f0b644bdffd n/a (libdconfsettings.so)
                #4  0x00007f0b6aa70415 g_thread_proxy (libglib-2.0.so.0)
                #5  0x00007f0b69ba5fa3 start_thread (libpthread.so.0)
                #6  0x00007f0b6a3b54cf __clone (libc.so.6)
                
                Stack trace of thread 413:
                #0  0x00007f0b6a3aa819 __poll (libc.so.6)
                #1  0x00007f0b6aa48136 g_main_context_poll (libglib-2.0.so.0)
                #2  0x00007f0b6aa484c2 g_main_loop_run (libglib-2.0.so.0)
                #3  0x00007f0b6ac740d6 gdbus_shared_thread_func (libgio-2.0.so.0)
                #4  0x00007f0b6aa70415 g_thread_proxy (libglib-2.0.so.0)
                #5  0x00007f0b69ba5fa3 start_thread (libpthread.so.0)
                #6  0x00007f0b6a3b54cf __clone (libc.so.6)

GNU gdb (Debian 8.2.1-2+b1) 8.2.1
Edited by Sebastian Krzyszkowiak