Failed to map NvKmsKapiMemory

The reason graphics memory is full and the whole computer freezes. How to do it? Open many instances (40) of mpv with a video.

[63184.586515] [drm:__nv_drm_gem_nvkms_map [nvidia_drm]] *ERROR* [nvidia-drm] [GPU ID 0x00000900] Failed to map NvKmsKapiMemory 0x0000000018bac5cf
[63184.603793] traps: Media[158588] trap invalid opcode ip:556262f1be1a sp:7f468e6311f0 error:0 in chromium[a1a4e1a,55625b83a000+f5c4000]
[63191.575709] NVRM: dmaAllocMapping_GM107: can't alloc VA space for mapping.
[63191.575724] NVRM: nvAssertOkFailedNoLog: Assertion failed: Out of memory [NV_ERR_NO_MEMORY] (0x00000051) returned from pReuseMappingDb->pMapCb(pReuseMappingDb->pGlobalCtx, pAllocCtx, range, cachingFlags, &token, _reusemappingdbAddMappingCallback) @ mapping_reuse.c:273
[63191.575737] NVRM: dmaAllocMapping_GM107: can't alloc VA space for mapping.
[63191.575790] NVRM: dmaAllocMapping_GM107: can't alloc VA space for mapping.
[63191.575818] NVRM: dmaAllocMapping_GM107: can't alloc VA space for mapping.
[63191.578706] NVRM: dmaAllocMapping_GM107: can't alloc VA space for mapping.
[63191.578715] NVRM: nvAssertOkFailedNoLog: Assertion failed: Out of memory [NV_ERR_NO_MEMORY] (0x00000051) returned from pReuseMappingDb->pMapCb(pReuseMappingDb->pGlobalCtx, pAllocCtx, range, cachingFlags, &token, _reusemappingdbAddMappingCallback) @ mapping_reuse.c:273
[63191.578723] NVRM: dmaAllocMapping_GM107: can't alloc VA space for mapping.
[63191.578729] NVRM: dmaAllocMapping_GM107: can't alloc VA space for mapping.
[63191.578732] NVRM: dmaAllocMapping_GM107: can't alloc VA space for mapping.
[63191.578769] NVRM: dmaAllocMapping_GM107: can't alloc VA space for mapping.
[63191.578773] NVRM: dmaAllocMapping_GM107: can't alloc VA space for mapping.
[63191.578841] NVRM: dmaAllocMapping_GM107: can't alloc VA space for mapping.
[63191.578874] NVRM: dmaAllocMapping_GM107: can't alloc VA space for mapping.
[63191.578908] NVRM: dmaAllocMapping_GM107: can't alloc VA space for mapping.
[63191.578913] NVRM: dmaAllocMapping_GM107: can't alloc VA space for mapping.
[63191.578963] NVRM: dmaAllocMapping_GM107: can't alloc VA space for mapping.
[63191.578967] NVRM: nvAssertOkFailedNoLog: Assertion failed: Out of memory [NV_ERR_NO_MEMORY] (0x00000051) returned from pReuseMappingDb->pMapCb(pReuseMappingDb->pGlobalCtx, pAllocCtx, range, cachingFlags, &token, _reusemappingdbAddMappingCallback) @ mapping_reuse.c:273
[63191.579081] NVRM: nvAssertOkFailedNoLog: Assertion failed: Out of memory [NV_ERR_NO_MEMORY] (0x00000051) returned from reusemappingdbMap(&pBar1VaInfo->reuseDb, pMappingType, mapRange, pMemArea, cachingFlags) @ kern_bus_gm107.c:3152
[63191.579097] [drm:__nv_drm_gem_nvkms_map [nvidia_drm]] *ERROR* [nvidia-drm] [GPU ID 0x00000900] Failed to map NvKmsKapiMemory 0x00000000e0d9252d
[63191.597800] traps: Media[159051] trap invalid opcode ip:556262f1be1a sp:7f468dc301f0 error:0 in chromium[a1a4e1a,55625b83a000+f5c4000]
root@rapthalia:~#

And the output from nvidia-smi processes:

|    0   N/A  N/A          100530    C+G   /usr/bin/mpv                            417MiB |
|    0   N/A  N/A          100617    C+G   /usr/bin/mpv                            357MiB |

One instance of mpv takes 350-420MB, depends on a video resolution and bitrate.