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Thanks for reporting the bug. >=20 > I have an idea how to fix this, but it would likely just trigger the next= issue. >=20 > Christian, can we revert this patch, and also the other patches that swit= ch from import_attach->dmabuf to ->dma_buf that cased the problem? Sure we can, but I would rather vote for fixing this at least for now. Thos= e patches are not just cleanup, but are fixing rare occurring real world pr= oblems. If we can't get it working in the next week or so we can still revert back = to a working state. What exactly is the issue? That cursors don't necessarily have GEM handles?= If yes how we grab/drop handle refs when we have a DMA-buf? Regards, Christian. >=20 > Best regards > Thomas >=20 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703007] [=C2=A0=C2=A0 T16= 28] Modules linked in: snd_seq_dummy snd_hrtimer snd_seq_midi snd_seq_midi_= event snd_rawmidi snd_seq snd_seq_device rfcomm bnep nls_ascii nls_cp437 vf= at fat snd_ctl_led snd_hda_codec_realtek snd_hda_codec_generic snd_hda_scod= ec_component snd_hda_codec_hdmi snd_hda_intel btusb snd_intel_dspcfg btrtl = btintel snd_hda_codec uvcvideo snd_soc_dmic snd_acp3x_pdm_dma btbcm snd_acp= 3x_rn btmtk snd_hwdep videobuf2_vmalloc snd_soc_core snd_hda_core videobuf2= _memops snd_pcm_oss uvc videobuf2_v4l2 bluetooth snd_mixer_oss videodev snd= _pcm snd_rn_pci_acp3x videobuf2_common snd_acp_config snd_timer msi_wmi ecd= h_generic snd_soc_acpi ecc mc sparse_keymap snd wmi_bmof edac_mce_amd k10te= mp soundcore snd_pci_acp3x ccp ac battery button joydev hid_sensor_accel_3d= hid_sensor_prox hid_sensor_als hid_sensor_magn_3d hid_sensor_gyro_3d hid_s= ensor_trigger industrialio_triggered_buffer kfifo_buf industrialio hid_sens= or_iio_common amd_pmc evdev mt7921e mt7921_common mt792x_lib >> mt76_connac_lib mt76 mac80211 libarc4 cfg80211 rfkill msr fuse >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703056] [=C2=A0=C2=A0 T16= 28]=C2=A0 nvme_fabrics efi_pstore configfs efivarfs autofs4 ext4 mbcache jb= d2 usbhid amdgpu drm_client_lib i2c_algo_bit drm_ttm_helper ttm drm_panel_b= acklight_quirks drm_exec drm_suballoc_helper amdxcp drm_buddy xhci_pci gpu_= sched xhci_hcd drm_display_helper hid_sensor_hub hid_multitouch mfd_core hi= d_generic drm_kms_helper psmouse i2c_hid_acpi nvme usbcore amd_sfh i2c_hid = hid cec serio_raw nvme_core r8169 crc16 i2c_piix4 usb_common i2c_smbus i2c_= designware_platform i2c_designware_core >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703082] [=C2=A0=C2=A0 T16= 28] CPU: 14 UID: 1000 PID: 1628 Comm: Xorg Not tainted 6.16.0-rc4-next-2025= 0703-master #127 PREEMPT_{RT,(full)} >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703085] [=C2=A0=C2=A0 T16= 28] Hardware name: Micro-Star International Co., Ltd. Alpha 15 B5EEK/MS-158= L, BIOS E158LAMS.10F 11/11/2024 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703086] [=C2=A0=C2=A0 T16= 28] RIP: 0010:drm_gem_object_handle_put_unlocked+0xaa/0xe0 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703088] [=C2=A0=C2=A0 T16= 28] Code: c7 f6 8a ff 48 89 ef e8 94 d4 2e 00 eb d8 48 8b 43 08 48 8d b8 d8= 06 00 00 e8 52 78 2b 00 c7 83 08 01 00 00 00 00 00 00 eb 98 <0f> 0b 5b 5d = e9 98 f6 8a ff 48 8b 83 68 01 00 00 48 8b 00 48 85 c0 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703089] [=C2=A0=C2=A0 T16= 28] RSP: 0018:ffffb8e8c7fbfb00 EFLAGS: 00010246 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703091] [=C2=A0=C2=A0 T16= 28] RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703092] [=C2=A0=C2=A0 T16= 28] RDX: 0000000000000000 RSI: ffff94cdc062b478 RDI: ffff94ce71390448 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703093] [=C2=A0=C2=A0 T16= 28] RBP: ffff94ce14780010 R08: ffff94cdc062b618 R09: ffff94ce14780278 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703094] [=C2=A0=C2=A0 T16= 28] R10: 0000000000000001 R11: ffff94cdc062b478 R12: ffff94ce14780010 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703095] [=C2=A0=C2=A0 T16= 28] R13: 0000000000000007 R14: 0000000000000004 R15: ffff94ce14780010 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703096] [=C2=A0=C2=A0 T16= 28] FS:=C2=A0 00007fc164276b00(0000) GS:ffff94dcb49cf000(0000) knlGS:000000= 0000000000 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703097] [=C2=A0=C2=A0 T16= 28] CS:=C2=A0 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703098] [=C2=A0=C2=A0 T16= 28] CR2: 00005647ccd53008 CR3: 000000012533f000 CR4: 0000000000750ef0 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703099] [=C2=A0=C2=A0 T16= 28] PKRU: 55555554 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703100] [=C2=A0=C2=A0 T16= 28] Call Trace: >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703101] [=C2=A0=C2=A0 T16= 28]=C2=A0 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703104] [=C2=A0=C2=A0 T16= 28]=C2=A0 drm_gem_fb_destroy+0x27/0x50 [drm_kms_helper] >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703113] [=C2=A0=C2=A0 T16= 28]=C2=A0 __drm_atomic_helper_plane_destroy_state+0x1a/0xa0 [drm_kms_helper= ] >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703119] [=C2=A0=C2=A0 T16= 28]=C2=A0 drm_atomic_helper_plane_destroy_state+0x10/0x20 [drm_kms_helper] >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703124] [=C2=A0=C2=A0 T16= 28]=C2=A0 drm_atomic_state_default_clear+0x1c0/0x2e0 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703127] [=C2=A0=C2=A0 T16= 28]=C2=A0 __drm_atomic_state_free+0x6c/0xb0 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703129] [=C2=A0=C2=A0 T16= 28]=C2=A0 drm_atomic_helper_disable_plane+0x92/0xe0 [drm_kms_helper] >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703135] [=C2=A0=C2=A0 T16= 28]=C2=A0 drm_mode_cursor_universal+0xf2/0x2a0 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703140] [=C2=A0=C2=A0 T16= 28]=C2=A0 drm_mode_cursor_common.part.0+0x9c/0x1e0 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703144] [=C2=A0=C2=A0 T16= 28]=C2=A0 ? drm_mode_setplane+0x320/0x320 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703146] [=C2=A0=C2=A0 T16= 28]=C2=A0 drm_mode_cursor_ioctl+0x8a/0xa0 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703148] [=C2=A0=C2=A0 T16= 28]=C2=A0 drm_ioctl_kernel+0xa1/0xf0 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703151] [=C2=A0=C2=A0 T16= 28]=C2=A0 drm_ioctl+0x26a/0x510 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703153] [=C2=A0=C2=A0 T16= 28]=C2=A0 ? drm_mode_setplane+0x320/0x320 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703155] [=C2=A0=C2=A0 T16= 28]=C2=A0 ? srso_alias_return_thunk+0x5/0xfbef5 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703157] [=C2=A0=C2=A0 T16= 28]=C2=A0 ? rt_spin_unlock+0x12/0x40 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703159] [=C2=A0=C2=A0 T16= 28]=C2=A0 ? do_setitimer+0x185/0x1d0 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703161] [=C2=A0=C2=A0 T16= 28]=C2=A0 ? srso_alias_return_thunk+0x5/0xfbef5 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703164] [=C2=A0=C2=A0 T16= 28]=C2=A0 amdgpu_drm_ioctl+0x46/0x90 [amdgpu] >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703283] [=C2=A0=C2=A0 T16= 28]=C2=A0 __x64_sys_ioctl+0x91/0xe0 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703286] [=C2=A0=C2=A0 T16= 28]=C2=A0 do_syscall_64+0x65/0xfc0 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703289] [=C2=A0=C2=A0 T16= 28]=C2=A0 entry_SYSCALL_64_after_hwframe+0x55/0x5d >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703291] [=C2=A0=C2=A0 T16= 28] RIP: 0033:0x7fc1645f78db >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703292] [=C2=A0=C2=A0 T16= 28] Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89= 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 = f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703294] [=C2=A0=C2=A0 T16= 28] RSP: 002b:00007ffd75bce430 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703295] [=C2=A0=C2=A0 T16= 28] RAX: ffffffffffffffda RBX: 000056224e896ea0 RCX: 00007fc1645f78db >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703296] [=C2=A0=C2=A0 T16= 28] RDX: 00007ffd75bce4c0 RSI: 00000000c01c64a3 RDI: 000000000000000f >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703297] [=C2=A0=C2=A0 T16= 28] RBP: 00007ffd75bce4c0 R08: 0000000000000100 R09: 0000562210547ab0 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703298] [=C2=A0=C2=A0 T16= 28] R10: 000000000000004c R11: 0000000000000246 R12: 00000000c01c64a3 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703298] [=C2=A0=C2=A0 T16= 28] R13: 000000000000000f R14: 0000000000000000 R15: 000056224e5c1cd0 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703302] [=C2=A0=C2=A0 T16= 28]=C2=A0 >> =C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703303] [=C2=A0=C2=A0 T16= 28] ---[ end trace 0000000000000000 ]--- >> >> As the warnings do not occur in next-20250702, I looked at the commits g= iven by >> $ git log --oneline next-20250702..next-20250703 drivers/gpu/drm >> to search for a culprit. So I reverted the most likely candidate, >> commit 582111e630f5 ("drm/gem: Acquire references on GEM handles for fra= mebuffers"), >> in next-20250703 and the warnings disappeared. >> This is the hardware I used: >> $ lspci >> 00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir/Cezanne R= oot Complex >> 00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Renoir/Cezanne IOMMU >> 00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dumm= y Host Bridge >> 00:01.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe GPP B= ridge >> 00:02.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dumm= y Host Bridge >> 00:02.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir/Cezanne PC= Ie GPP Bridge >> 00:02.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir/Cezanne PC= Ie GPP Bridge >> 00:02.3 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir/Cezanne PC= Ie GPP Bridge >> 00:02.4 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir/Cezanne PC= Ie GPP Bridge >> 00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dumm= y Host Bridge >> 00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir Internal P= CIe GPP Bridge to Bus >> 00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (= rev 51) >> 00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (r= ev 51) >> 00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Cezanne Data Fab= ric; Function 0 >> 00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Cezanne Data Fab= ric; Function 1 >> 00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Cezanne Data Fab= ric; Function 2 >> 00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Cezanne Data Fab= ric; Function 3 >> 00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Cezanne Data Fab= ric; Function 4 >> 00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Cezanne Data Fab= ric; Function 5 >> 00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Cezanne Data Fab= ric; Function 6 >> 00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Cezanne Data Fab= ric; Function 7 >> 01:00.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] Navi 10 XL Up= stream Port of PCI Express Switch (rev c3) >> 02:00.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] Navi 10 XL Do= wnstream Port of PCI Express Switch >> 03:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Navi = 23 [Radeon RX 6600/6600 XT/6600M] (rev c3) >> 03:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Navi 21/23 = HDMI/DP Audio Controller >> 04:00.0 Network controller: MEDIATEK Corp. MT7921K (RZ608) Wi-Fi 6E 80MH= z >> 05:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/816= 8/8211/8411 PCI Express Gigabit Ethernet Controller (rev 15) >> 06:00.0 Non-Volatile memory controller: Kingston Technology Company, Inc= . KC3000/FURY Renegade NVMe SSD [E18] (rev 01) >> 07:00.0 Non-Volatile memory controller: Micron/Crucial Technology P1 NVM= e PCIe SSD[Frampton] (rev 03) >> 08:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI= ] Cezanne [Radeon Vega Series / Radeon Vega Mobile Series] (rev c5) >> 08:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Renoir Rade= on High Definition Audio Controller >> 08:00.2 Encryption controller: Advanced Micro Devices, Inc. [AMD] Family= 17h (Models 10h-1fh) Platform Security Processor >> 08:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Renoir/Cezann= e USB 3.1 >> 08:00.4 USB controller: Advanced Micro Devices, Inc. [AMD] Renoir/Cezann= e USB 3.1 >> 08:00.5 Multimedia controller: Advanced Micro Devices, Inc. [AMD] Audio = Coprocessor (rev 01) >> 08:00.6 Audio device: Advanced Micro Devices, Inc. [AMD] Family 17h/19h/= 1ah HD Audio Controller >> 08:00.7 Signal processing controller: Advanced Micro Devices, Inc. [AMD]= Sensor Fusion Hub >> >> >> Bert Karwatzki >=20