StacktraceTop: pushbuf_kref () from /tmp/apport_sandbox_wEJVpY/usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2 pushbuf_validate () from /tmp/apport_sandbox_wEJVpY/usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2 PUSH_KICK (push=<optimized out>) at ../../../../../src/gallium/drivers/nouveau/nouveau_winsys.h:59 nv50_flush (pipe=0x7f0ef000ec30, fence=<optimized out>, flags=<optimized out>) at ../../../../../src/gallium/drivers/nouveau/nv50/nv50_context.c:40 _mesa_FenceSync (condition=<optimized out>, flags=<optimized out>) at ../../../src/mesa/main/syncobj.c:295
StacktraceTop: sandbox_ wEJVpY/ usr/lib/ x86_64- linux-gnu/ libdrm_ nouveau. so.2 sandbox_ wEJVpY/ usr/lib/ x86_64- linux-gnu/ libdrm_ nouveau. so.2 ./../.. /src/gallium/ drivers/ nouveau/ nouveau_ winsys. h:59 0ec30, fence=<optimized out>, flags=<optimized out>) at ../../. ./../.. /src/gallium/ drivers/ nouveau/ nv50/nv50_ context. c:40 <optimized out>, flags=<optimized out>) at ../../. ./src/mesa/ main/syncobj. c:295
pushbuf_kref () from /tmp/apport_
pushbuf_validate () from /tmp/apport_
PUSH_KICK (push=<optimized out>) at ../../.
nv50_flush (pipe=0x7f0ef00
_mesa_FenceSync (condition=