(gdb) t a a bt

Thread 3 (Thread 0x7f40c3c4d700 (LWP 1732)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f40c893a973 in cnd_wait (mtx=0xed53f8, cond=0xed5420) at ../../../../include/c11/threads_posix.h:159
#2  pipe_semaphore_wait (sema=0xed53f8) at ../../../../src/gallium/auxiliary/os/os_thread.h:275
#3  thread_function (init_data=init_data@entry=0xed5350) at lp_rast.c:805
#4  0x00007f40c893a7d7 in impl_thrd_routine (p=<optimized out>) at ../../../../include/c11/threads_posix.h:87
#5  0x00007f40cd9306ca in start_thread (arg=0x7f40c3c4d700) at pthread_create.c:333
#6  0x00007f40cd66af6f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 2 (Thread 0x7f40c444e700 (LWP 1731)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f40c893a973 in cnd_wait (mtx=0xed5290, cond=0xed52b8) at ../../../../include/c11/threads_posix.h:159
#2  pipe_semaphore_wait (sema=0xed5290) at ../../../../src/gallium/auxiliary/os/os_thread.h:275
#3  thread_function (init_data=init_data@entry=0xed51e8) at lp_rast.c:805
#4  0x00007f40c893a7d7 in impl_thrd_routine (p=<optimized out>) at ../../../../include/c11/threads_posix.h:87
#5  0x00007f40cd9306ca in start_thread (arg=0x7f40c444e700) at pthread_create.c:333
#6  0x00007f40cd66af6f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 1 (Thread 0x7f40d051fa40 (LWP 1728)):
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:58
#1  0x00007f40cd59a52a in __GI_abort () at abort.c:89
#2  0x00007f40cd590e37 in __assert_fail_base (fmt=<optimized out>, assertion=assertion@entry=0x7f40c7d4c8ca "bkref", file=file@entry=0x7f40c7d4c8ba "pushbuf.c", 
    line=line@entry=238, function=function@entry=0x7f40c7d4c908 <__PRETTY_FUNCTION__.6018> "pushbuf_krel") at assert.c:92
#3  0x00007f40cd590ee2 in __GI___assert_fail (assertion=assertion@entry=0x7f40c7d4c8ca "bkref", file=file@entry=0x7f40c7d4c8ba "pushbuf.c", line=line@entry=238, 
    function=function@entry=0x7f40c7d4c908 <__PRETTY_FUNCTION__.6018> "pushbuf_krel") at assert.c:101
#4  0x00007f40c7d4a66b in pushbuf_krel (push=push@entry=0x9a0c70, bo=<optimized out>, data=data@entry=0, flags=flags@entry=4096, vor=vor@entry=0, tor=tor@entry=0)
    at pushbuf.c:238
#5  0x00007f40c7d4bb12 in nouveau_pushbuf_reloc (push=push@entry=0x9a0c70, bo=<optimized out>, data=data@entry=0, flags=flags@entry=4096, vor=vor@entry=0, tor=tor@entry=0)
    at pushbuf.c:746
#6  0x00007f40c869ff8b in PUSH_RELOC (tor=0, vor=0, flags=4096, offset=0, bo=<optimized out>, push=0x9a0c70) at nv30/nv30_winsys.h:26
#7  nv30_transfer_rect_m2mf (nv30=<optimized out>, filter=<optimized out>, src=0x7ffe84fc8df0, dst=0x7ffe84fc8e30) at nv30/nv30_transfer.c:524
#8  0x00007f40c8697985 in nv30_resource_copy_region (pipe=0x9bab90, dstres=0x1335a40, dst_level=0, dstx=1, dsty=278, dstz=<optimized out>, srcres=0x133f550, src_level=0, 
    src_box=0x7ffe84fc8fe4) at nv30/nv30_miptree.c:145
#9  0x00007f40c857eb04 in util_try_blit_via_copy_region (ctx=ctx@entry=0x9bab90, blit=blit@entry=0x7ffe84fc8fb0) at util/u_surface.c:775
#10 0x00007f40c8697bb8 in nv30_blit (pipe=0x9bab90, blit_info=0x7ffe84fc91e0) at nv30/nv30_miptree.c:213
#11 0x00007f40c835d807 in st_TexSubImage (ctx=<optimized out>, dims=2, texImage=<optimized out>, xoffset=1, yoffset=278, zoffset=0, width=1907, height=399, depth=1, 
    format=32993, type=33639, pixels=0x7f40c1fe4000, unpack=0x7f40d05de278) at state_tracker/st_cb_texture.c:1595
#12 0x00007f40c82e25eb in _mesa_texture_sub_image (ctx=ctx@entry=0x7f40d05c3010 <sd_bus_add_match+3096>, dims=dims@entry=2, texObj=texObj@entry=0x1342e20, 
    texImage=0x124d5b0, target=target@entry=3553, level=level@entry=0, xoffset=1, yoffset=278, zoffset=0, width=1907, height=399, depth=1, format=32993, type=33639, 
    pixels=0x7f40c1fe4000, dsa=false) at main/teximage.c:3239
#13 0x00007f40c82e2856 in texsubimage (ctx=0x7f40d05c3010 <sd_bus_add_match+3096>, dims=2, target=3553, level=0, xoffset=1, yoffset=278, zoffset=0, width=1907, height=399, 
    depth=1, format=32993, type=33639, pixels=0x7f40c1fe4000, callerName=0x7f40c89df0ce "glTexSubImage2D") at main/teximage.c:3297
#14 0x00007f40c82e2c78 in _mesa_TexSubImage2D (target=<optimized out>, level=<optimized out>, xoffset=<optimized out>, yoffset=<optimized out>, width=<optimized out>, 
    height=<optimized out>, format=32993, type=33639, pixels=0x7f40c1fe4000) at main/teximage.c:3438
#15 0x000000000043e830 in glamor_upload_boxes (pixmap=<optimized out>, in_boxes=0x12b3b80, in_nbox=<optimized out>, dx_src=-1, dy_src=-38, dx_dst=dx_dst@entry=0, dy_dst=0, 
    bits=0x7f40c1e22000 "\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\346\347\347\377\345\346\346\377\343\344\344\377\343\343\343\377\341\342\341\377\337\340\337\377\337\340\340\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377"..., byte_stride=7680)
    at glamor_transfer.c:106
#16 0x000000000043e8f2 in glamor_upload_region (pixmap=<optimized out>, region=region@entry=0x7ffe84fc95d0, region_x=region_x@entry=1, region_y=region_y@entry=38, 
    bits=bits@entry=0x7f40c1e22000 "\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\346\347\347\377\345\346\346\377\343\344\344\377\343\343\343\377\341\342\341\377\337\340\337\377\337\340\340\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377"..., 
    byte_stride=<optimized out>) at glamor_transfer.c:135
#17 0x000000000043142f in glamor_put_image_gl (depth=<optimized out>, 
    bits=0x7f40c1e22000 "\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\346\347\347\377\345\346\346\377\343\344\344\377\343\343\343\377\341\342\341\377\337\340\337\377\337\340\340\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377"..., format=<optimized out>, 
    leftPad=0, h=1071, w=<optimized out>, y=38, x=1, gc=0x121a8b0, drawable=0x117cd00) at glamor_image.c:79
#18 glamor_put_image (drawable=0x117cd00, gc=0x121a8b0, depth=<optimized out>, x=<optimized out>, y=<optimized out>, w=<optimized out>, h=1071, leftPad=0, format=2, 
    bits=0x7f40c1e22000 "\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\346\347\347\377\345\346\346\377\343\344\344\377\343\343\343\377\341\342\341\377\337\340\337\377\337\340\340\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377"...) at glamor_image.c:100
#19 0x00000000004fb229 in damagePutImage (pDrawable=0x117cd00, pGC=0x121a8b0, depth=24, x=0, y=0, w=<optimized out>, h=1071, leftPad=0, format=2, 
    pImage=0x7f40c1e22000 "\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\347\350\350\377\346\347\347\377\345\346\346\377\343\344\344\377\343\343\343\377\341\342\341\377\337\340\337\377\337\340\340\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377\335\336\336\377"...) at damage.c:737
#20 0x000000000048b450 in ProcShmPutImage (client=0x117f8c0) at shm.c:584
#21 0x000000000048cca5 in ProcShmDispatch (client=0x117f8c0) at shm.c:1315
#22 0x0000000000556715 in Dispatch () at dispatch.c:469
#23 0x000000000055a698 in dix_main (argc=10, argv=0x7ffe84fc9a18, envp=<optimized out>) at main.c:287
#24 0x00007f40cd583401 in __libc_start_main (main=0x423d50 <main>, argc=10, argv=0x7ffe84fc9a18, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, 
    stack_end=0x7ffe84fc9a08) at ../csu/libc-start.c:289
#25 0x0000000000423d8a in _start ()