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While everything works correctly on kernel >> 7.1.0-rc5, upgrading to 7.1.0-rc7 causes GPU memory operations to hang >> indefinitely. This occurs during tasks like torch.empty() or model weight >> transfers in ComfyUI (PyTorch 2.11.0+rocm7.13). >> >> I have bisected the changes in drivers/gpu/drm/amd/ between rc5 and rc7 and >> identified the following potential causes: > > Hi Jonathan, > > Can you please bisect which of those four patches causes your issue? > > Thanks, > Timur > >> >> 1. amdgpu_hmm.c (Christian König): >> >> - 1c824497d: Changing the invalidate callback to wait on the VM root BO >> reservation lock may be introducing a deadlock. No, that was done before anyway. Just with a different BO. >> - 962d684b5: Moving the notifier_seq read outside the retry loop could >> cause infinite retries with a stale sequence number. That was indeed an issue but should be fixed on amd-staging-drm-next. Can you re-test with that branch? Thanks, Christian. >> - 58bafc666: Changes to userptr submission waiting. >> >> 2. gfxhub_v12_0.c (Timur Kristóf): >> >> - 40bab7c60: The change to CRASH_ON_*_FAULT bits might be causing the GPU >> to retry failed memory accesses indefinitely rather than surfacing a fault. > > Your Strix Halo chip has a GFX11.5 core which uses gfxhub_v11_5.c > Changes to gfxhub_v12_0.c will not affect your chip. > > Note that retry faults are not enabled on Strix Halo by default, and don't > behave the way you described. > >> >> 3. gmc_v12_0.c (Harish Kasiviswanathan): >> >> - ae4e30f24 and e3fa02872: If the new per-version PTE address masks for >> gfx1151 are incorrect, it could result in corrupted page table entries. >> >> 4. amdgpu_gart.c (Donet Tom): >> >> - ec4c462e2: The updated PTE iteration grouping may be producing >> incorrect page tables when combined with the new PTE mask. >> >> Downgrading to 7.1.0-rc5 resolves the issue. Please let me know if you >> require any specific debug output or further testing. >> >> Best regards, >> Jonathan > > >