On Mon, 22 Mar 2021 at 11:34, Christian König <ckoenig.leichtzumerken@xxxxxxxxx> wrote: > > Hi Daniel, > > Am 22.03.21 um 10:38 schrieb Daniel Gomez: > > On Fri, 19 Mar 2021 at 21:29, Felix Kuehling <felix.kuehling@xxxxxxx> wrote: > >> This caused a regression in kfdtest in a large-buffer stress test after > >> memory allocation for user pages fails: > > I'm sorry to hear that. BTW, I guess you meant amdgpu leak patch and > > not this one. > > Just some background for the mem leak patch if helps to understand this: > > The leak was introduce here: > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0b988ca1c7c4c73983b4ea96ef7c2af2263c87eb > > where the bound status was introduced for all drm drivers including > > radeon and amdgpu. So this patch just reverts the logic to the > > original code but keeping the bound status. In my case, the binding > > code allocates the user pages memory and returns without bounding (at > > amdgpu_gtt_mgr_has_gart_addr). So, > > when the unbinding happens, the memory needs to be cleared to prevent the leak. > > Ah, now I understand what's happening here. Daniel your patch is not > really correct. > > The problem is rather that we don't set the tt object to bound if it > doesn't have a GTT address. Okay, I understand. > > Going to provide a patch for this. Looking forward to your patch. Thanks Christian! > > Regards, > Christian. > > > > >> [17359.536303] amdgpu: init_user_pages: Failed to get user pages: -16 > >> [17359.543746] BUG: kernel NULL pointer dereference, address: 0000000000000000 > >> [17359.551494] #PF: supervisor read access in kernel mode > >> [17359.557375] #PF: error_code(0x0000) - not-present page > >> [17359.563247] PGD 0 P4D 0 > >> [17359.566514] Oops: 0000 [#1] SMP PTI > >> [17359.570728] CPU: 8 PID: 5944 Comm: kfdtest Not tainted 5.11.0-kfd-fkuehlin #193 > >> [17359.578760] Hardware name: ASUS All Series/X99-E WS/USB 3.1, BIOS 3201 06/17/2016 > >> [17359.586971] RIP: 0010:amdgpu_ttm_backend_unbind+0x52/0x110 [amdgpu] > >> [17359.594075] Code: 48 39 c6 74 1b 8b 53 0c 48 8d bd 80 a1 ff ff e8 24 62 00 00 85 c0 0f 85 ab 00 00 00 c6 43 54 00 5b 5d c3 48 8b 46 10 8b 4e 50 <48> 8b 30 48 85 f6 74 ba 8b 50 0c 48 8b bf 80 a1 ff ff 83 e1 01 45 > >> [17359.614340] RSP: 0018:ffffa4764971fc98 EFLAGS: 00010206 > >> [17359.620315] RAX: 0000000000000000 RBX: ffff950e8d4edf00 RCX: 0000000000000000 > >> [17359.628204] RDX: 0000000000000000 RSI: ffff950e8d4edf00 RDI: ffff950eadec5e80 > >> [17359.636084] RBP: ffff950eadec5e80 R08: 0000000000000000 R09: 0000000000000000 > >> [17359.643958] R10: 0000000000000246 R11: 0000000000000001 R12: ffff950c03377800 > >> [17359.651833] R13: ffff950eadec5e80 R14: ffff950c03377858 R15: 0000000000000000 > >> [17359.659701] FS: 00007febb20cb740(0000) GS:ffff950ebfc00000(0000) knlGS:0000000000000000 > >> [17359.668528] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > >> [17359.675012] CR2: 0000000000000000 CR3: 00000006d700e005 CR4: 00000000001706e0 > >> [17359.682883] Call Trace: > >> [17359.686063] amdgpu_ttm_backend_destroy+0x12/0x70 [amdgpu] > >> [17359.692349] ttm_bo_cleanup_memtype_use+0x37/0x60 [ttm] > >> [17359.698307] ttm_bo_release+0x278/0x5e0 [ttm] > >> [17359.703385] amdgpu_bo_unref+0x1a/0x30 [amdgpu] > >> [17359.708701] amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu+0x7e5/0x910 [amdgpu] > >> [17359.716307] kfd_ioctl_alloc_memory_of_gpu+0x11a/0x220 [amdgpu] > >> [17359.723036] kfd_ioctl+0x223/0x400 [amdgpu] > >> [17359.728017] ? kfd_dev_is_large_bar+0x90/0x90 [amdgpu] > >> [17359.734152] __x64_sys_ioctl+0x8b/0xd0 > >> [17359.738796] do_syscall_64+0x2d/0x40 > >> [17359.743259] entry_SYSCALL_64_after_hwframe+0x44/0xa9 > >> [17359.749205] RIP: 0033:0x7febb083b6d7 > >> [17359.753681] Code: b3 66 90 48 8b 05 b1 47 2d 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 81 47 2d 00 f7 d8 64 89 01 48 > >> [17359.774340] RSP: 002b:00007ffdb5522cd8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 > >> [17359.782668] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007febb083b6d7 > >> [17359.790566] RDX: 00007ffdb5522d60 RSI: 00000000c0284b16 RDI: 0000000000000003 > >> [17359.798459] RBP: 00007ffdb5522d10 R08: 00007ffdb5522dd0 R09: 00000000c4000004 > >> [17359.806352] R10: 0000000000000000 R11: 0000000000000202 R12: 0000559416e4e2aa > >> [17359.814251] R13: 0000000000000000 R14: 0000000000000021 R15: 0000000000000000 > >> [17359.822140] Modules linked in: ip6table_filter ip6_tables iptable_filter amdgpu x86_pkg_temp_thermal drm_ttm_helper ttm iommu_v2 gpu_sched ip_tables x_tables > >> [17359.837776] CR2: 0000000000000000 > >> [17359.841888] ---[ end trace a6f27d64475b28c8 ]--- > >> [17359.847318] RIP: 0010:amdgpu_ttm_backend_unbind+0x52/0x110 [amdgpu] > >> [17359.854479] Code: 48 39 c6 74 1b 8b 53 0c 48 8d bd 80 a1 ff ff e8 24 62 00 00 85 c0 0f 85 ab 00 00 00 c6 43 54 00 5b 5d c3 48 8b 46 10 8b 4e 50 <48> 8b 30 48 85 f6 74 ba 8b 50 0c 48 8b bf 80 a1 ff ff 83 e1 01 45 > >> [17359.874929] RSP: 0018:ffffa4764971fc98 EFLAGS: 00010206 > >> [17359.881014] RAX: 0000000000000000 RBX: ffff950e8d4edf00 RCX: 0000000000000000 > >> [17359.889007] RDX: 0000000000000000 RSI: ffff950e8d4edf00 RDI: ffff950eadec5e80 > >> [17359.897008] RBP: ffff950eadec5e80 R08: 0000000000000000 R09: 0000000000000000 > >> [17359.905020] R10: 0000000000000246 R11: 0000000000000001 R12: ffff950c03377800 > >> [17359.913034] R13: ffff950eadec5e80 R14: ffff950c03377858 R15: 0000000000000000 > >> [17359.921050] FS: 00007febb20cb740(0000) GS:ffff950ebfc00000(0000) knlGS:0000000000000000 > >> [17359.930047] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > >> [17359.936674] CR2: 0000000000000000 CR3: 00000006d700e005 CR4: 00000000001706e0 > > From what I understand, the init_user_pages fails (returns EBUSY) and > > the code goes to allocate_init_user_pages_failed where the unbind and > > the userptr clear occurs. > > Can we prevent this if we save the bounding status + userptr alloc? so > > the function amdgpu_ttm_backend_unbind returns without trying to clear > > the userptr memory? > > > > Something like: > > > > amdgpu_ttm_backend_bind: > > if (gtt->userptr) { > > r = amdgpu_ttm_tt_pin_userptr(bdev, ttm); > > if (r) ... > > gtt->sg_table = true; > > } > > > > amdgpu_ttm_backend_unbind: > > if (gtt->sg_table) { > > if (gtt->user_ptr) ... > > } > > > > If you agree, I'll send a v2 patch. Otherwise, maybe we could return > > within amdgpu_ttm_tt_unpin_userptr if memory hasn't been allocated. > > > > Any other ideas? > > > > Regards, > > Daniel > > > >> Reverting this patch fixes the problem for me. > >> > >> Regards, > >> Felix > >> > >> On 2021-03-18 10:57 p.m., Alex Deucher wrote: > >>> Applied. Thanks! > >>> > >>> Alex > >>> > >>> On Thu, Mar 18, 2021 at 5:00 AM Koenig, Christian > >>> <Christian.Koenig@xxxxxxx> wrote: > >>>> Reviewed-by: Christian König <christian.koenig@xxxxxxx> > >>>> ________________________________ > >>>> Von: Daniel Gomez <daniel@xxxxxxxx> > >>>> Gesendet: Donnerstag, 18. März 2021 09:32 > >>>> Cc: dagmcr@xxxxxxxxx <dagmcr@xxxxxxxxx>; Daniel Gomez <daniel@xxxxxxxx>; Deucher, Alexander <Alexander.Deucher@xxxxxxx>; Koenig, Christian <Christian.Koenig@xxxxxxx>; David Airlie <airlied@xxxxxxxx>; Daniel Vetter <daniel@xxxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx <amd-gfx@xxxxxxxxxxxxxxxxxxxxx>; dri-devel@xxxxxxxxxxxxxxxxxxxxx <dri-devel@xxxxxxxxxxxxxxxxxxxxx>; linux-kernel@xxxxxxxxxxxxxxx <linux-kernel@xxxxxxxxxxxxxxx> > >>>> Betreff: [PATCH] drm/radeon/ttm: Fix memory leak userptr pages > >>>> > >>>> If userptr pages have been pinned but not bounded, > >>>> they remain uncleared. > >>>> > >>>> Signed-off-by: Daniel Gomez <daniel@xxxxxxxx> > >>>> --- > >>>> drivers/gpu/drm/radeon/radeon_ttm.c | 5 +++-- > >>>> 1 file changed, 3 insertions(+), 2 deletions(-) > >>>> > >>>> diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c > >>>> index e8c66d10478f..bbcc6264d48f 100644 > >>>> --- a/drivers/gpu/drm/radeon/radeon_ttm.c > >>>> +++ b/drivers/gpu/drm/radeon/radeon_ttm.c > >>>> @@ -485,13 +485,14 @@ static void radeon_ttm_backend_unbind(struct ttm_bo_device *bdev, struct ttm_tt > >>>> struct radeon_ttm_tt *gtt = (void *)ttm; > >>>> struct radeon_device *rdev = radeon_get_rdev(bdev); > >>>> > >>>> + if (gtt->userptr) > >>>> + radeon_ttm_tt_unpin_userptr(bdev, ttm); > >>>> + > >>>> if (!gtt->bound) > >>>> return; > >>>> > >>>> radeon_gart_unbind(rdev, gtt->offset, ttm->num_pages); > >>>> > >>>> - if (gtt->userptr) > >>>> - radeon_ttm_tt_unpin_userptr(bdev, ttm); > >>>> gtt->bound = false; > >>>> } > >>>> > >>>> -- > >>>> 2.30.2 > >>>> > >>>> _______________________________________________ > >>>> dri-devel mailing list > >>>> dri-devel@xxxxxxxxxxxxxxxxxxxxx > >>>> https://lists.freedesktop.org/mailman/listinfo/dri-devel > >>> _______________________________________________ > >>> dri-devel mailing list > >>> dri-devel@xxxxxxxxxxxxxxxxxxxxx > >>> https://lists.freedesktop.org/mailman/listinfo/dri-devel > > _______________________________________________ > > amd-gfx mailing list > > amd-gfx@xxxxxxxxxxxxxxxxxxxxx > > https://lists.freedesktop.org/mailman/listinfo/amd-gfx > _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
