Error with lock

const LOCK = ReentrantLock()

function inference(imgs)
    lock(LOCK)
    try
        out = nn(imgs)
        return maximum(cpu(out))
    finally
        unlock(LOCK)
    end
end

### ERROR:

WARNING: Error while freeing DeviceBuffer(3.906 MiB at 0x000000030a95a000):
ErrorException("val already in a list")

Stacktrace:
  [1] WARNING: Error while freeing DeviceBuffer(3.906 MiB at 0x0000000306de3200):
ErrorException("task switch not allowed from inside gc finalizer")

Stacktrace:
  [1] error(try_yieldto(s::String)
    @ undo::typeof(Base.ensure_rescheduled))
    @ Base ./Base ./task.jl:767error.jl:33
 
  [2] push! [2]
    @  ./linked_list.jl:53 [inlined]
 wait [3] _wait2(c::()
    @ Base ./task.jl:837
  [3]Base.GenericCondition wait(c::Base.GenericCondition{Base.Threads.SpinLock})
{Base.Threads.SpinLock}, waiter::    @ TaskBase ./condition.jl:123)

    @ Base ./  [4] condition.jl:84
 lock(rl:: [4] wait(c::ReentrantLock)
    @ Base.GenericCondition{Base.Threads.SpinLock}Base ./lock.jl:100
  [5] )
    @ Base ./condition.jl:120
  [5] lock(rl::ReentrantLock)
    @ Base ./lock.jl:100
  [6] macro expansion
    @ ./lock.jl:226 [inlined]
  [7] macro expansion
    @ ./lock.jl:226 [inlined]
  [6] (::CUDA.var"#new_unique#10")(handle::Ptr{Nothing})
    @ CUDA ~/.julia/packages/CUDA/0IDh2/lib/cudadrv/context.jl:42
  [8] current_context
    @ ~/.julia/packages/CUDA/0IDh2/lib/cudadrv/context.jl:63 [inlined]
  [9] (::CUDA.var"#new_unique#10")(handle::Ptr{Nothing})
    @ CUDA ~/.julia/packages/CUDA/0IDh2/lib/cudadrv/context.jl:42
  [7] current_context
    @ ~/.julia/packages/CUDA/0IDh2/lib/cudadrv/context.jl:63 [inlined]
  [8] CUDA.CuStream(; flags::CUDA.CUstream_flags_enum, priority::Nothing)
    @ CUDA ~/.julia/packages/CUDA/0IDh2/lib/cudadrv/stream.jl:26
 [10] CuStream
    @ ~/.julia/packages/CUDA/0IDh2/lib/cudadrv/stream.jl:18 [inlined]
 [11] create_stream()
    @ CUDA ~/.julia/packages/CUDA/0IDh2/src/state.jl:379
 [12] stream
    @ ~/.julia/packages/CUDA/0IDh2/src/state.jl:373 [inlined]
 [13] active_state
    @ ~/.julia/packages/CUDA/0IDh2/src/state.jl:107 [inlined]
 [14] #_free#183
    @ ~/.julia/packages/CUDA/0IDh2/src/pool.jl:262 [inlined]
 [15] macro expansion
    @ ~/.julia/packages/CUDA/0IDh2/src/pool.jl:247 [inlined]
 [16] macro expansion
    @ ./timing.jl:299 [inlined]
 [17] #free#182
    @ ~/.julia/packages/CUDA/0IDh2/src/pool.jl:246 [inlined]
 [18] macro expansion
    @ ~/.julia/packages/CUDA/0IDh2/src/array.jl:81 [inlined]
 [19] macro expansion
    @ ~/.julia/packages/CUDA/0IDh2/src/state.jl:182 [inlined]
 [20] unsafe_free!(xs::CUDA.CuArrayCUDA.CuStream({Float32, 4, CUDA.Mem.DeviceBuffer}, stream::CUDA.CuStream)
    @ CUDA ~/.julia/packages/CUDA/0IDh2/src/array.jl:80
 [21] unsafe_finalize!(xs::CUDA.CuArray{Float32, 4, CUDA.Mem.DeviceBuffer})
    @ CUDA ~/.julia/packages/CUDA/0IDh2/src/array.jl:101
 [22] enable_finalizers
    @ ./gcutils.jl:123 [inlined]
 [23] unlock(l::Base.Threads.SpinLock)
    @ Base.Threads ./locks-mt.jl:92
 [24] unlockall
    @ ./condition.jl:23 [inlined]
 [25] wait(c::Base.GenericCondition{Base.Threads.SpinLock})
    @ Base ./condition.jl:121
 [26] lock(rl::ReentrantLock)
    @ Base ./lock.jl:100
 [27] inference(imgs::CUDA.CuArray{Float32, 4, CUDA.Mem.DeviceBuffer})
    @ Main ~/knightvision/piece_recognition/KnightVisionServer/test/test_cuda.jl:17
;  flags[28] (::var"#5#6")()
    @ Main ./threadingconstructs.jl:178
::CUDA.CUstream_flags_enum, priority::Nothing)
    @ CUDA ~/.julia/packages/CUDA/0IDh2/lib/cudadrv/stream.jl:26
  [9] CuStream
    @ ~/.julia/packages/CUDA/0IDh2/lib/cudadrv/stream.jl:18 [inlined]
 [10] create_stream()
    @ CUDA ~/.julia/packages/CUDA/0IDh2/src/state.jl:379
 [11] stream
    @ ~/.julia/packages/CUDA/0IDh2/src/state.jl:373 [inlined]
 [12] active_state
    @ ~/.julia/packages/CUDA/0IDh2/src/state.jl:107 [inlined]
 [13] #_free#183
    @ ~/.julia/packages/CUDA/0IDh2/src/pool.jl:262 [inlined]
 [14] macro expansion
    @ ~/.julia/packages/CUDA/0IDh2/src/pool.jl:247 [inlined]
 [15] macro expansion
    @ ./timing.jl:299 [inlined]
 [16] #free#182
    @ ~/.julia/packages/CUDA/0IDh2/src/pool.jl:246 [inlined]
 [17] macro expansion
    @ ~/.julia/packages/CUDA/0IDh2/src/array.jl:81 [inlined]
 [18] macro expansion
    @ ~/.julia/packages/CUDA/0IDh2/src/state.jl:182 [inlined]
 [19] unsafe_free!(xs::CUDA.CuArray{Float32, 4, CUDA.Mem.DeviceBuffer}, stream::CUDA.CuStream)
    @ CUDA ~/.julia/packages/CUDA/0IDh2/src/array.jl:80
 [20] unsafe_finalize!(xs::CUDA.CuArray{Float32, 4, CUDA.Mem.DeviceBuffer})
    @ CUDA ~/.julia/packages/CUDA/0IDh2/src/array.jl:101
 [21] process_events
    @ ./libuv.jl:104 [inlined]
 [22] wait()
    @ Base ./task.jl:838
 [23] wait(c::Base.GenericCondition{Base.Threads.SpinLock})
    @ Base ./condition.jl:123
 [24] lock(rl::ReentrantLock)
    @ Base ./lock.jl:100
 [25] inference(imgs::CUDA.CuArray{Float32, 4, CUDA.Mem.DeviceBuffer})
    @ Main ~/knightvision/piece_recognition/KnightVisionServer/test/test_cuda.jl:17
 [26] (::var"#5#6")()
    @ Main ./threadingconstructs.jl:178
ERROR: LoadError: TaskFailedException

    nested task error: schedule: Task not runnable
    Stacktrace:
     [1] error(s::String)
       @ Base ./error.jl:33
     [2] schedule(t::Task, arg::Any; error::Bool)
       @ Base ./task.jl:697
     [3] notify(c::Base.GenericCondition{Base.Threads.SpinLock}, arg::Any, all::Bool, error::Bool)
       @ Base ./condition.jl:147
     [4] #notify#558
       @ ./condition.jl:141 [inlined]
     [5] notify (repeats 2 times)
       @ ./condition.jl:141 [inlined]
     [6] unlock(rl::ReentrantLock)
       @ Base ./lock.jl:132
     [7] inference(imgs::CUDA.CuArray{Float32, 4, CUDA.Mem.DeviceBuffer})
       @ Main ~/knightvision/piece_recognition/KnightVisionServer/test/test_cuda.jl:22
     [8] (::var"#5#6")()
       @ Main ./threadingconstructs.jl:178

...and 1 more exception.

Stacktrace:
 [1] sync_end(c::Channel{Any})
   @ Base ./task.jl:381
 [2] top-level scope
   @ task.jl:400
in expression starting at /home/mattias/knightvision/piece_recognition/KnightVisionServer/test/test_cuda.jl:35