XWayland backtrace: #0 0x00007f313ed56777 in writev () from /usr/lib/libc.so.6 #1 0x0000561963d3d31b in _XSERVTransSocketWritev (ciptr=0x561965a611c0, buf=0x7fff1bf8fe20, size=0) at /usr/include/X11/Xtrans/Xtranssock.c:2367 #2 0x0000561963e36b5b in _XSERVTransWritev (size=, buf=0x7fff1bf8fe20, ciptr=) at /usr/include/X11/Xtrans/Xtrans.c:954 #3 FlushClient (who=who@entry=0x561965a0d650, oc=oc@entry=0x561965a74170, __extraBuf=__extraBuf@entry=0x7fff1bf8ff70, extraCount=extraCount@entry=-4) at ../xorg-server-1.20.0/os/io.c:882 #4 0x0000561963e37c04 in WriteToClient (who=0x561965a0d650, count=-4, __buf=0x7fff1bf8ff70) at ../xorg-server-1.20.0/os/io.c:795 #5 0x0000561963d3afa4 in proc_dri3_buffers_from_pixmap (client=0x561965a0d650) at ../xorg-server-1.20.0/dri3/dri3_request.c:555 #6 0x0000561963d39e6b in proc_dri3_dispatch (client=) at ../xorg-server-1.20.0/dri3/dri3_request.c:581 #7 0x0000561963d4ff3a in Dispatch () at ../xorg-server-1.20.0/dix/dispatch.c:478 #8 dix_main (envp=, argv=, argc=) at ../xorg-server-1.20.0/dix/main.c:276 #9 main (argc=, argv=, envp=) at ../xorg-server-1.20.0/dix/stubmain.c:34 Firefox (Web Content): #0 0x00007f8c01809ea9 in poll () at /usr/lib/libc.so.6 #1 0x00007f8bfbd9d9b2 in _xcb_conn_wait (c=0x7f8c00de1000, cond=0x7fffabeacd40, vector=0x0, count=0x0) at xcb_conn.c:479 #2 0x00007f8bfbd9fa9b in wait_for_reply (c=0x7f8c00de1000, request=182, e=0x0) at xcb_in.c:516 #3 0x00007f8bfbd9fbcf in xcb_wait_for_reply (c=0x7f8c00de1000, request=182, e=0x0) at xcb_in.c:546 #4 0x00007f8bdb280db7 in xcb_dri3_buffers_from_pixmap_reply (c=0x7f8c00de1000, cookie=..., e=0x0) at dri3.c:910 #5 0x00007f8bdbd6493b in dri3_get_pixmap_buffer (driDrawable=0x7f8bdc797b40, format=4099, buffer_type=loader_dri3_buffer_front, draw=0x7f8be8a02e98) at ../mesa-18.1.0/src/loader/loader_dri3_helper.c:1587 #6 0x00007f8bdbd65166 in loader_dri3_get_buffers (driDrawable=0x7f8bdc797b40, format=4099, stamp=0x7f8be748cc00, loaderPrivate=0x7f8be8a02e98, buffer_mask=2, buffers=0x7fffabeacff0) at ../mesa-18.1.0/src/loader/loader_dri3_helper.c:1854 #7 0x00007f8bd72013b1 in dri_image_drawable_get_buffers (drawable=0x7f8be748cc00, images=0x7fffabeacff0, statts=0x7f8bd1d91430, statts_count=1) at ../mesa-18.1.0/src/gallium/state_trackers/dri/dri2.c:547 #8 0x00007f8bd720174b in dri2_allocate_textures (ctx=0x7f8bdc73c150, drawable=0x7f8be748cc00, statts=0x7f8bd1d91430, statts_count=1) at ../mesa-18.1.0/src/gallium/state_trackers/dri/dri2.c:674 #9 0x00007f8bd7205d96 in dri_st_framebuffer_validate (stctx=0x7f8bd1da8000, stfbi=0x7f8be748cc00, statts=0x7f8bd1d91430, count=1, out=0x7fffabead170) at ../mesa-18.1.0/src/gallium/state_trackers/dri/dri_drawable.c:85 #10 0x00007f8bd782417c in st_framebuffer_validate (stfb=0x7f8bd1d91000, st=0x7f8bd1da8000) at ../mesa-18.1.0/src/mesa/state_tracker/st_manager.c:201 #11 0x00007f8bd7825e0d in st_api_make_current (stapi=0x7f8bd84665c0 , stctxi=0x7f8bd1da8000, stdrawi=0x7f8be748cc00, streadi=0x7f8be748cc00) at ../mesa-18.1.0/src/mesa/state_tracker/st_manager.c:1043 #12 0x00007f8bd72057f3 in dri_make_current (cPriv=0x7f8bdc770700, driDrawPriv=0x7f8bdc797b40, driReadPriv=0x7f8bdc797b40) at ../mesa-18.1.0/src/gallium/state_trackers/dri/dri_context.c:295 #13 0x00007f8bd71fd95b in driBindContext (pcp=0x7f8bdc770700, pdp=0x7f8bdc797b40, prp=0x7f8bdc797b40) at ../mesa-18.1.0/src/mesa/drivers/dri/common/dri_util.c:585 #14 0x00007f8bdbd5533f in dri3_bind_context (context=0x7f8be8a02ff0, old=0x7f8bdbf80020 , draw=8388611, read=8388611) at ../mesa-18.1.0/src/glx/dri3_glx.c:210 #15 0x00007f8bdbd36928 in MakeContextCurrent (dpy=0x7f8c00ddf000, draw=8388611, read=8388611, gc_user=0x7f8be8a02ff0) at ../mesa-18.1.0/src/glx/glxcurrent.c:213 #16 0x00007f8bdbd36aad in glXMakeCurrent (dpy=0x7f8c00ddf000, draw=8388611, gc=0x7f8be8a02ff0) at ../mesa-18.1.0/src/glx/glxcurrent.c:260 #17 0x00007f8bdc23ebe4 in InternalMakeCurrentVendor (dpy=0x7f8c00ddf000, draw=8388611, read=8388611, ctxInfo=0x7f8bdc742d80, callerOpcode=5 '\005', threadState=0x7f8bdc742ec0, vendor=0x7f8c00d163f0) at libglx.c:823 #18 0x00007f8bdc23ed08 in InternalMakeCurrentDispatch (dpy=0x7f8c00ddf000, draw=8388611, read=8388611, ctxInfo=0x7f8bdc742d80, callerOpcode=5 '\005', vendor=0x7f8c00d163f0) at libglx.c:878 #19 0x00007f8bdc23f507 in CommonMakeCurrent (dpy=0x7f8c00ddf000, draw=8388611, read=8388611, context=0x7f8be8a02ff0, callerOpcode=5 '\005') at libglx.c:1022 #20 0x00007f8bdc23f5f1 in glXMakeCurrent (dpy=0x7f8c00ddf000, drawable=8388611, context=0x7f8be8a02ff0) at libglx.c:1067 #21 0x00007f8bdc4b5c70 in glXMakeCurrent (dpy=0x7f8c00ddf000, drawable=8388611, ctx=0x7f8be8a02ff0) at g_libglglxwrapper.c:917 #22 0x00007f8bf3b14601 in () at /usr/lib/firefox/libxul.so #23 0x00007f8bf3b2fbc1 in () at /usr/lib/firefox/libxul.so #24 0x00007f8bf3b55732 in () at /usr/lib/firefox/libxul.so #25 0x00007f8bf3b56be9 in () at /usr/lib/firefox/libxul.so #26 0x00007f8bf3b146c6 in () at /usr/lib/firefox/libxul.so #27 0x00007f8bf3b15ac9 in () at /usr/lib/firefox/libxul.so #28 0x00007f8bf3b16116 in () at /usr/lib/firefox/libxul.so #29 0x00007f8bf3b16284 in () at /usr/lib/firefox/libxul.so #30 0x00007f8bf46f67cd in () at /usr/lib/firefox/libxul.so #31 0x00007f8bf46f6be5 in () at /usr/lib/firefox/libxul.so #32 0x00007f8bf46f727f in () at /usr/lib/firefox/libxul.so #33 0x00007f8bf46fcd31 in () at /usr/lib/firefox/libxul.so #34 0x00007f8bf46a8182 in () at /usr/lib/firefox/libxul.so #35 0x00007f8bf46b76af in () at /usr/lib/firefox/libxul.so #36 0x00007f8bf4908361 in () at /usr/lib/firefox/libxul.so #37 0x00007f8bf4593dd7 in () at /usr/lib/firefox/libxul.so #38 0x00007f8bf4675972 in () at /usr/lib/firefox/libxul.so #39 0x00007f8bf5fb50fb in () at /usr/lib/firefox/libxul.so #40 0x00007f8bf5fa7733 in () at /usr/lib/firefox/libxul.so #41 0x00007f8bf5fb4d25 in () at /usr/lib/firefox/libxul.so #42 0x00007f8bf5fb528c in () at /usr/lib/firefox/libxul.so #43 0x00007f8bf5fb54e8 in () at /usr/lib/firefox/libxul.so #44 0x00007f8bf6289190 in () at /usr/lib/firefox/libxul.so #45 0x00007f8bf453280f in () at /usr/lib/firefox/libxul.so #46 0x00007f8bf3e28bca in () at /usr/lib/firefox/libxul.so #47 0x00007f8bf3edd25e in () at /usr/lib/firefox/libxul.so #48 0x00007f8bf3eb7562 in () at /usr/lib/firefox/libxul.so #49 0x00007f8bf3eb75c9 in () at /usr/lib/firefox/libxul.so #50 0x00007f8bf32d32f9 in () at /usr/lib/firefox/libxul.so #51 0x00007f8bf32c52d5 in () at /usr/lib/firefox/libxul.so #52 0x00007f8bf32c4154 in () at /usr/lib/firefox/libxul.so #53 0x00007f8bf32bbd40 in () at /usr/lib/firefox/libxul.so #54 0x00007f8bf32c8dd7 in () at /usr/lib/firefox/libxul.so #55 0x00007f8bf32d1638 in () at /usr/lib/firefox/libxul.so #56 0x00007f8bf35d44fa in () at /usr/lib/firefox/libxul.so #57 0x00007f8bf35a96e5 in () at /usr/lib/firefox/libxul.so #58 0x00007f8bf50219b8 in () at /usr/lib/firefox/libxul.so #59 0x00007f8bf5eef9d7 in () at /usr/lib/firefox/libxul.so #60 0x00007f8bf35a96e5 in () at /usr/lib/firefox/libxul.so #61 0x00007f8bf5eefd44 in () at /usr/lib/firefox/libxul.so #62 0x000055d800ca7dc6 in () #63 0x000055d800ca7731 in () #64 0x00007f8c0173f06b in __libc_start_main () at /usr/lib/libc.so.6 #65 0x000055d800ca79ea in _start ()