Here is a backtrace:

#0  0x00007ffff61f4e08 in unlink_block (info=0x555555612a00) at ../src/util/ralloc.c:274
#1  ralloc_free (ptr=0x555555612a30) at ../src/util/ralloc.c:265
#2  ralloc_free (ptr=0x555555612a30) at ../src/util/ralloc.c:257
#3  0x00007ffff6135f0c in (anonymous namespace)::builtin_builder::release (this=0x7ffff711feb0 <builtins>) at ../src/compiler/glsl/builtin_functions.cpp:7662
#4  _mesa_glsl_builtin_functions_decref () at ../src/compiler/glsl/builtin_functions.cpp:7662
#5  0x00007ffff5f0a48d in _mesa_free_context_data (ctx=ctx@entry=0x55555586eb40, destroy_debug_output=destroy_debug_output@entry=false) at ../src/mesa/main/context.c:1405
#6  0x00007ffff5e9c237 in st_destroy_context (st=0x555555609a60) at ../src/mesa/state_tracker/st_context.c:1115
#7  0x00007ffff5e7da12 in dri_destroy_context (cPriv=<optimized out>) at ../src/gallium/frontends/dri/dri_context.c:247
#8  0x00007ffff63173d7 in driDestroyContext (pcp=0x5555555e85a0) at ../src/mesa/drivers/dri/common/dri_util.c:528
#9  0x00007ffff7643fb3 in dri3_destroy_context (context=0x5555555e8410) at ../src/glx/dri3_glx.c:181
#10 0x00007ffff762e539 in glXDestroyContext (ctx=0x5555555e8410, dpy=0x55555558d960) at ../src/glx/glxcmds.c:511
#11 glXDestroyContext (dpy=0x55555558d960, ctx=0x5555555e8410) at ../src/glx/glxcmds.c:492
#12 0x00007ffff7fb1934 in vdp::GLXManagedContext::destroy (this=0x55555560e668) at ./src/x-display-ref.hh:70
#13 vdp::GLXManagedContext::destroy (this=0x55555560e668) at ./src/glx-context.cc:79
#14 0x00007ffff7fb212e in vdp::GLXManagedContext::~GLXManagedContext (this=0x55555560e668, __in_chrg=<optimized out>) at ./src/glx-context.hh:54
#15 std::pair<int const, vdp::GLXManagedContext>::~pair (this=0x55555560e660, __in_chrg=<optimized out>) at /usr/include/c++/9/bits/stl_pair.h:208
#16 __gnu_cxx::new_allocator<std::_Rb_tree_node<std::pair<int const, vdp::GLXManagedContext> > >::destroy<std::pair<int const, vdp::GLXManagedContext> > (this=0x7ffff7fc7700 <(anonymous namespace)::g_glc_map>, __p=0x55555560e660)
    at /usr/include/c++/9/ext/new_allocator.h:153
#17 std::allocator_traits<std::allocator<std::_Rb_tree_node<std::pair<int const, vdp::GLXManagedContext> > > >::destroy<std::pair<int const, vdp::GLXManagedContext> > (__a=..., __p=0x55555560e660)
    at /usr/include/c++/9/bits/alloc_traits.h:497
#18 std::_Rb_tree<int, std::pair<int const, vdp::GLXManagedContext>, std::_Select1st<std::pair<int const, vdp::GLXManagedContext> >, std::less<int>, std::allocator<std::pair<int const, vdp::GLXManagedContext> > >::_M_destroy_node (
    this=0x7ffff7fc7700 <(anonymous namespace)::g_glc_map>, __p=0x55555560e640) at /usr/include/c++/9/bits/stl_tree.h:642
#19 std::_Rb_tree<int, std::pair<int const, vdp::GLXManagedContext>, std::_Select1st<std::pair<int const, vdp::GLXManagedContext> >, std::less<int>, std::allocator<std::pair<int const, vdp::GLXManagedContext> > >::_M_drop_node (
    this=0x7ffff7fc7700 <(anonymous namespace)::g_glc_map>, __p=0x55555560e640) at /usr/include/c++/9/bits/stl_tree.h:650
#20 std::_Rb_tree<int, std::pair<int const, vdp::GLXManagedContext>, std::_Select1st<std::pair<int const, vdp::GLXManagedContext> >, std::less<int>, std::allocator<std::pair<int const, vdp::GLXManagedContext> > >::_M_erase (
    this=this@entry=0x7ffff7fc7700 <(anonymous namespace)::g_glc_map>, __x=0x55555560e640) at /usr/include/c++/9/bits/stl_tree.h:1915
#21 0x00007ffff7fb1c7a in std::_Rb_tree<int, std::pair<int const, vdp::GLXManagedContext>, std::_Select1st<std::pair<int const, vdp::GLXManagedContext> >, std::less<int>, std::allocator<std::pair<int const, vdp::GLXManagedContext> > >::clear (this=0x7ffff7fc7700 <(anonymous namespace)::g_glc_map>) at /usr/include/c++/9/bits/stl_tree.h:1264
#22 std::map<int, vdp::GLXManagedContext, std::less<int>, std::allocator<std::pair<int const, vdp::GLXManagedContext> > >::clear (this=0x7ffff7fc7700 <(anonymous namespace)::g_glc_map>) at /usr/include/c++/9/bits/stl_map.h:1133
#23 vdp::GLXGlobalContext::~GLXGlobalContext (this=0x55555558d8f0, __in_chrg=<optimized out>) at ./src/glx-context.cc:195
#24 0x00007ffff7f9e3d6 in vdp::Device::Resource::~Resource (this=0x55555558d8a0, __in_chrg=<optimized out>) at ./src/api-device.cc:482
#25 0x00007ffff7f9f6a8 in std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release (this=0x55555558d890) at /usr/include/c++/9/bits/shared_ptr_base.h:148
#26 std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release (this=0x55555558d890) at /usr/include/c++/9/bits/shared_ptr_base.h:148
#27 std::__shared_count<(__gnu_cxx::_Lock_policy)2>::~__shared_count (this=0x555555e087e0, __in_chrg=<optimized out>) at /usr/include/c++/9/bits/shared_ptr_base.h:730
#28 std::__shared_ptr<vdp::Device::Resource, (__gnu_cxx::_Lock_policy)2>::~__shared_ptr (this=0x555555e087d8, __in_chrg=<optimized out>) at /usr/include/c++/9/bits/shared_ptr_base.h:1169
#29 std::shared_ptr<vdp::Device::Resource>::~shared_ptr (this=0x555555e087d8, __in_chrg=<optimized out>) at /usr/include/c++/9/bits/shared_ptr.h:103
#30 std::pair<unsigned int const, std::shared_ptr<vdp::Device::Resource> >::~pair (this=0x555555e087d0, __in_chrg=<optimized out>) at /usr/include/c++/9/bits/stl_pair.h:208
#31 __gnu_cxx::new_allocator<std::_Rb_tree_node<std::pair<unsigned int const, std::shared_ptr<vdp::Device::Resource> > > >::destroy<std::pair<unsigned int const, std::shared_ptr<vdp::Device::Resource> > > (
    this=0x7ffff7fc77c0 <(anonymous namespace)::storage+128>, __p=0x555555e087d0) at /usr/include/c++/9/ext/new_allocator.h:153
#32 std::allocator_traits<std::allocator<std::_Rb_tree_node<std::pair<unsigned int const, std::shared_ptr<vdp::Device::Resource> > > > >::destroy<std::pair<unsigned int const, std::shared_ptr<vdp::Device::Resource> > > (__a=...,
    __p=0x555555e087d0) at /usr/include/c++/9/bits/alloc_traits.h:497
#33 std::_Rb_tree<unsigned int, std::pair<unsigned int const, std::shared_ptr<vdp::Device::Resource> >, std::_Select1st<std::pair<unsigned int const, std::shared_ptr<vdp::Device::Resource> > >, std::less<unsigned int>, std::allocator<std::pair<unsigned int const, std::shared_ptr<vdp::Device::Resource> > > >::_M_destroy_node (this=0x7ffff7fc77c0 <(anonymous namespace)::storage+128>, __p=0x555555e087b0) at /usr/include/c++/9/bits/stl_tree.h:642
#34 std::_Rb_tree<unsigned int, std::pair<unsigned int const, std::shared_ptr<vdp::Device::Resource> >, std::_Select1st<std::pair<unsigned int const, std::shared_ptr<vdp::Device::Resource> > >, std::less<unsigned int>, std::allocator<std::pair<unsigned int const, std::shared_ptr<vdp::Device::Resource> > > >::_M_drop_node (this=0x7ffff7fc77c0 <(anonymous namespace)::storage+128>, __p=0x555555e087b0) at /usr/include/c++/9/bits/stl_tree.h:650
#35 std::_Rb_tree<unsigned int, std::pair<unsigned int const, std::shared_ptr<vdp::Device::Resource> >, std::_Select1st<std::pair<unsigned int const, std::shared_ptr<vdp::Device::Resource> > >, std::less<unsigned int>, std::allocator<std::pair<unsigned int const, std::shared_ptr<vdp::Device::Resource> > > >::_M_erase (this=0x7ffff7fc77c0 <(anonymous namespace)::storage+128>, __x=0x555555e087b0) at /usr/include/c++/9/bits/stl_tree.h:1915
#36 0x00007ffff7fb878d in std::_Rb_tree<unsigned int, std::pair<unsigned int const, std::shared_ptr<vdp::Device::Resource> >, std::_Select1st<std::pair<unsigned int const, std::shared_ptr<vdp::Device::Resource> > >, std::less<unsigned int>, std::allocator<std::pair<unsigned int const, std::shared_ptr<vdp::Device::Resource> > > >::~_Rb_tree (this=0x7ffff7fc77c0 <(anonymous namespace)::storage+128>, __in_chrg=<optimized out>) at /usr/include/c++/9/bits/stl_tree.h:994
#37 std::map<unsigned int, std::shared_ptr<vdp::Device::Resource>, std::less<unsigned int>, std::allocator<std::pair<unsigned int const, std::shared_ptr<vdp::Device::Resource> > > >::~map (
    this=0x7ffff7fc77c0 <(anonymous namespace)::storage+128>, __in_chrg=<optimized out>) at /usr/include/c++/9/bits/stl_map.h:300
#38 vdp::ResourceStorage<vdp::Device::Resource>::~ResourceStorage (this=0x7ffff7fc7798 <(anonymous namespace)::storage+88>, __in_chrg=<optimized out>) at ./src/handle-storage.hh:77
#39 ~<constructor>(void) (this=0x7ffff7fc7740 <(anonymous namespace)::storage>, __in_chrg=<optimized out>) at ./src/handle-storage.cc:38
#40 0x00007ffff7a9fa57 in __run_exit_handlers (status=0, listp=0x7ffff7c3e738 <__exit_funcs>, run_list_atexit=run_list_atexit@entry=true, run_dtors=run_dtors@entry=true) at exit.c:108
#41 0x00007ffff7a9fc00 in __GI_exit (status=<optimized out>) at exit.c:139
#42 0x00007ffff7a83cb9 in __libc_start_main (main=0x555555556280 <main(int, char**)>, argc=1, argv=0x7fffffffdba8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffdb98)
    at ../csu/libc-start.c:348
#43 0x000055555555661e in _start () at vdpauinfo.cpp:507