For little more than year I've been battling with an issue, where after watching Youtube for hour or two, and having 5-6 open tabs with videos, at some point Firefox woul… (read more)
For little more than year I've been battling with an issue, where after watching Youtube for hour or two, and having 5-6 open tabs with videos, at some point Firefox would crawl to a stop with UI going down to 1-2 fps, and finally inability to click anything, until I restarted the browser.
Only today I have pieced together, that when it happens, task manager shows almost all of my GPU's VRAM (Dedicated GPU memory) is claimed by Firefox. It looks that there is a GPU memory leak somewhere.
How should I go on about this? If it's a bug, what I should include in a report?
Here is ~2 hrs of progress, PC and Firefox specs at the end:
This is after watching one ~20 minute video:
====================
GPU (pid 10124)
Explicit Allocations
0.24 MB (100.0%) -- explicit
└──0.24 MB (100.0%) -- gfx/webrender/gpu-cache
├──0.24 MB (100.0%) ── metadata
└──0.00 MB (00.00%) ── cpu-mirror
Other Measurements
0.78 MB (100.0%) -- gfx
└──0.78 MB (100.0%) ── webrender/textures/gpu-cache
265.84 MB ── gpu-committed
1,246.20 MB ── gpu-dedicated
11.72 MB ── gpu-shared
End of GPU (pid 10124)
====================
After second video, another 15 minutes later:
====================
GPU (pid 10124)
Explicit Allocations
0.29 MB (100.0%) -- explicit
└──0.29 MB (100.0%) -- gfx/webrender/gpu-cache
├──0.29 MB (100.0%) ── metadata
└──0.00 MB (00.00%) ── cpu-mirror
Other Measurements
0.63 MB (100.0%) -- gfx
└──0.63 MB (100.0%) ── webrender/textures/gpu-cache
277.34 MB ── gpu-committed
1,737.74 MB ── gpu-dedicated
16.55 MB ── gpu-shared
End of GPU (pid 10124)
====================
After opening and CLOSING several youtube tabs, withplaying 10-15 seconds of each video:
====================
GPU (pid 10124)
Explicit Allocations
0.19 MB (100.0%) -- explicit
└──0.19 MB (100.0%) -- gfx/webrender/gpu-cache
├──0.19 MB (100.0%) ── metadata
└──0.00 MB (00.00%) ── cpu-mirror
Other Measurements
0.78 MB (100.0%) -- gfx
└──0.78 MB (100.0%) ── webrender/textures/gpu-cache
390.18 MB ── gpu-committed
4,339.20 MB ── gpu-dedicated
4.27 MB ── gpu-shared
End of GPU (pid 10124)
================================
Here, I closed all tabs except about:memory. After another ~60 minutes of random browsing non-video pages (literally text pages and Google Docs):
====================
GPU (pid 10124)
Explicit Allocations
0.25 MB (100.0%) -- explicit
└──0.25 MB (100.0%) -- gfx/webrender/gpu-cache
├──0.25 MB (100.0%) ── metadata
└──0.00 MB (00.00%) ── cpu-mirror
Other Measurements
0.94 MB (100.0%) -- gfx
└──0.94 MB (100.0%) ── webrender/textures/gpu-cache
324.99 MB ── gpu-committed
4,396.21 MB ── gpu-dedicated
0.62 MB ── gpu-shared
End of GPU (pid 10124)
====================
It never goes down.
Then, I opened played for few seconds, stopped and closed (including tabs) ~15 youtube videos:
================================
GPU (pid 10124)
Explicit Allocations
52.08 MB (100.0%) -- explicit
├──23.07 MB (44.29%) -- gfx
│ ├──23.07 MB (44.29%) -- webrender
│ │ ├──10.00 MB (19.20%) ── upload-stagin-memory
│ │ ├───6.74 MB (12.95%) ── texture-cache/structures
│ │ ├───3.69 MB (07.08%) -- interning
│ │ │ ├──1.48 MB (02.84%) -- clip
│ │ │ │ ├──0.78 MB (01.50%) ── interners
│ │ │ │ └──0.70 MB (01.34%) ── data-stores
│ │ │ ├──1.24 MB (02.39%) -- text_run
│ │ │ │ ├──0.92 MB (01.77%) ── interners
│ │ │ │ └──0.32 MB (00.62%) ── data-stores
│ │ │ └──0.96 MB (01.85%) ++ (15 tiny)
│ │ ├───0.95 MB (01.83%) ++ (6 tiny)
│ │ ├───0.89 MB (01.71%) ── shader-cache
│ │ └───0.79 MB (01.52%) -- resource-cache
│ │ ├──0.79 MB (01.52%) ── fonts
│ │ └──0.00 MB (00.00%) ++ (3 tiny)
│ └───0.00 MB (00.00%) ++ (3 tiny)
├──19.94 MB (38.30%) ── heap-unclassified
├───4.00 MB (07.68%) ── ac2d/heap-resources
├───3.25 MB (06.25%) -- threads
│ ├──2.29 MB (04.40%) ++ stacks
│ └──0.96 MB (01.85%) -- overhead
│ ├──0.91 MB (01.76%) ── kernel
│ └──0.05 MB (00.09%) ++ (2 tiny)
├───1.35 MB (02.59%) -- phc
│ ├──1.35 MB (02.59%) ── metadata
│ └──0.00 MB (00.00%) ── fragmentation
└───0.46 MB (00.89%) ++ (9 tiny)
Other Measurements
134,217,727.94 MB (100.0%) -- address-space
├──132,114,625.34 MB (98.43%) ── free(segments=370)
├────2,101,793.05 MB (01.57%) -- reserved
│ ├──2,097,077.34 MB (01.56%) ── mapped(segments=14)
│ └──────4,715.70 MB (00.00%) ── private(segments=550)
└────────1,309.55 MB (00.00%) ++ commit
72.73 MB (100.0%) -- decommitted
└──72.73 MB (100.0%) -- heap
├──61.39 MB (84.41%) ── decommitted
└──11.34 MB (15.59%) -- unused-pages
├──11.34 MB (15.59%) ── fresh
└───0.00 MB (00.00%) ── madvised
304.62 MB (100.0%) -- gfx
└──304.62 MB (100.0%) -- webrender
├──302.79 MB (99.40%) -- textures
│ ├──192.00 MB (63.03%) ── render-targets
│ ├───44.00 MB (14.44%) -- texture-cache
│ │ ├──44.00 MB (14.44%) ── atlas
│ │ └───0.00 MB (00.00%) ── standalone
│ ├───32.00 MB (10.51%) ── depth-targets
│ ├───18.93 MB (06.21%) ── swap-chains
│ ├───11.25 MB (03.69%) ── upload-staging-textures
│ └────4.61 MB (01.51%) ++ (5 tiny)
└────1.83 MB (00.60%) ++ images/mapped_from_owner
128.00 MB (100.0%) -- heap
├───72.73 MB (56.82%) -- decommitted
│ ├──61.39 MB (47.96%) ── unmapped
│ └──11.34 MB (08.86%) -- unused-pages
│ ├──11.34 MB (08.86%) ── fresh
│ └───0.00 MB (00.00%) ── madvised
└───55.27 MB (43.18%) -- committed
├──48.27 MB (37.71%) ── allocated
├───3.95 MB (03.09%) -- bin-unused
│ ├──2.35 MB (01.84%) ++ (44 tiny)
│ └──1.60 MB (01.25%) ── bin-1024
├───1.96 MB (01.53%) ── bookkeeping
└───1.09 MB (00.85%) ── unused-pages/dirty
41 (100.0%) -- ipc-channels
├───7 (17.07%) ── PCompositorManagerParent
├───7 (17.07%) ── PImageBridgeParent
├───7 (17.07%) ── PVRManagerParent
├───6 (14.63%) ── PRemoteDecoderManagerParent
├───5 (12.20%) ── PAPZInputBridgeParent
├───4 (09.76%) ── PCanvasManagerParent
├───2 (04.88%) ── PVideoBridgeParent
├───1 (02.44%) ── PGPUParent
├───1 (02.44%) ── PProfilerChild
└───1 (02.44%) ── PVsyncBridgeParent
78 (100.0%) -- ipc-channels-peak
├──14 (17.95%) ── PCompositorManagerParent
├──14 (17.95%) ── PImageBridgeParent
├──14 (17.95%) ── PVRManagerParent
├──13 (16.67%) ── PRemoteDecoderManagerParent
├──10 (12.82%) ── PCanvasManagerParent
├───8 (10.26%) ── PAPZInputBridgeParent
├───2 (02.56%) ── PVideoBridgeParent
├───1 (01.28%) ── PGPUParent
├───1 (01.28%) ── PProfilerChild
└───1 (01.28%) ── PVsyncBridgeParent
25 (100.0%) -- observer-service
└──25 (100.0%) -- referent
├──22 (88.00%) ── strong
└───3 (12.00%) -- weak
├──3 (12.00%) ── alive
└──0 (00.00%) ── dead
1 (100.0%) -- preference-service
└──1 (100.0%) -- referent
├──1 (100.0%) ── strong
└──0 (00.00%) ++ weak
1 ── ac2d-context-count
0 ── ac2d-target-count
4.00 MB ── ac2d-texture-memory
0.00 MB ── gfx-d2d-vram-draw-target
0.00 MB ── gfx-d2d-vram-source-surface
462.87 MB ── gpu-committed
6,829.63 MB ── gpu-dedicated
0.62 MB ── gpu-shared
48.27 MB ── heap-allocated
1.00 MB ── heap-chunksize
686.68 MB ── private
558.20 MB ── resident
481.14 MB ── resident-unique
44.44 MB ── system-heap-allocated
2,103,102.59 MB ── vsize
129,414,503.44 MB ── vsize-max-contiguous
0 ── webgl-buffer-count
0.00 MB ── webgl-buffer-memory
0 ── webgl-context-count
0 ── webgl-renderbuffer-count
0.00 MB ── webgl-renderbuffer-memory
0 ── webgl-shader-count
0 ── webgl-texture-count
0.00 MB ── webgl-texture-memory
End of GPU (pid 10124)
====================
This just continues, when gpu-dedicated hits ~7.8 GB, Firefox becomes unusable, and rest of the system appears a bit sluggish.
I can't say if this is regression, since I haven't been watching YT at all until recently.
Windows 10 Pro 22H2
Firefox Nightly 64 bit EN, 139.0a1 build 20250405211119
Checked in my normal everyday profile and with new clean one.
GPU acceleration enabled, all video codecs installed.
Hardware: Core i7 9750H, 32 GB DDR4, GeForce 4060 8 GB.
this is NOT a RAM issue, RAM usage never goes above ~19 GB on this PC.
It happens a tad bit slower than before, when I had 1060 6 GB.
I also noticed it on my laptop with integrated Intel GPU, but I don't have it anymore, so can't really check.
