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Thanks for reporting the bug. >>> >>> I have an idea how to fix this, but it would likely just trigger the ne= xt issue. >>> >>> Christian, can we revert this patch, and also the other patches that sw= itch 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. T= hose patches are not just cleanup, but are fixing rare occurring real world= problems. >> >> If we can't get it working in the next week or so we can still revert ba= ck to a working state. >> >> What exactly is the issue? That cursors don't necessarily have GEM handl= es? If yes how we grab/drop handle refs when we have a DMA-buf? >=20 > A dozen drivers apparently use drm_gem_fb_destroy() but not drm_gem_fb_in= it_with_funcs(). So they don't take the ref on the handle. That's what we'r= e seeing here. Fixing this would mean to go through all affected drivers an= d take the handle refs an needed. The shortcut would be to take the handle = refs in drm_framebuffer_init() and put them in drm_framebuffer_cleanup(). T= hose are the minimal calls for all implementations. But there's the fbdev c= ode of some drivers that does magic hackery on framebuffer and object alloc= ation. so whatever we do, it's likely not a quick fixup. Best regards Thoma= s Ok that sounds worse than I thought it would be. Feel free to add my Acked-= by to a revert for now. Thanks, Christian. >> >> Regards, >> Christian. >> >>> Best regards >>> Thomas >>> >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703007] [=C2=A0= =C2=A0 T1628] 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 nl= s_cp437 vfat fat snd_ctl_led snd_hda_codec_realtek snd_hda_codec_generic sn= d_hda_scodec_component snd_hda_codec_hdmi snd_hda_intel btusb snd_intel_dsp= cfg btrtl btintel snd_hda_codec uvcvideo snd_soc_dmic snd_acp3x_pdm_dma btb= cm snd_acp3x_rn btmtk snd_hwdep videobuf2_vmalloc snd_soc_core snd_hda_core= videobuf2_memops snd_pcm_oss uvc videobuf2_v4l2 bluetooth snd_mixer_oss vi= deodev snd_pcm snd_rn_pci_acp3x videobuf2_common snd_acp_config snd_timer m= si_wmi ecdh_generic snd_soc_acpi ecc mc sparse_keymap snd wmi_bmof edac_mce= _amd k10temp soundcore snd_pci_acp3x ccp ac battery button joydev hid_senso= r_accel_3d hid_sensor_prox hid_sensor_als hid_sensor_magn_3d hid_sensor_gyr= o_3d hid_sensor_trigger industrialio_triggered_buffer kfifo_buf industriali= o hid_sensor_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=C2=A0 8.703056] [=C2=A0= =C2=A0 T1628]=C2=A0 nvme_fabrics efi_pstore configfs efivarfs autofs4 ext4 = mbcache jbd2 usbhid amdgpu drm_client_lib i2c_algo_bit drm_ttm_helper ttm d= rm_panel_backlight_quirks drm_exec drm_suballoc_helper amdxcp drm_buddy xhc= i_pci gpu_sched xhci_hcd drm_display_helper hid_sensor_hub hid_multitouch m= fd_core hid_generic drm_kms_helper psmouse i2c_hid_acpi nvme usbcore amd_sf= h 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=C2=A0 8.703082] [=C2=A0= =C2=A0 T1628] CPU: 14 UID: 1000 PID: 1628 Comm: Xorg Not tainted 6.16.0-rc4= -next-20250703-master #127 PREEMPT_{RT,(full)} >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703085] [=C2=A0= =C2=A0 T1628] Hardware name: Micro-Star International Co., Ltd. Alpha 15 B5= EEK/MS-158L, BIOS E158LAMS.10F 11/11/2024 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703086] [=C2=A0= =C2=A0 T1628] RIP: 0010:drm_gem_object_handle_put_unlocked+0xaa/0xe0 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703088] [=C2=A0= =C2=A0 T1628] Code: c7 f6 8a ff 48 89 ef e8 94 d4 2e 00 eb d8 48 8b 43 08 4= 8 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=C2=A0 8.703089] [=C2=A0= =C2=A0 T1628] RSP: 0018:ffffb8e8c7fbfb00 EFLAGS: 00010246 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703091] [=C2=A0= =C2=A0 T1628] RAX: 0000000000000000 RBX: 0000000000000001 RCX: 000000000000= 0000 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703092] [=C2=A0= =C2=A0 T1628] RDX: 0000000000000000 RSI: ffff94cdc062b478 RDI: ffff94ce7139= 0448 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703093] [=C2=A0= =C2=A0 T1628] RBP: ffff94ce14780010 R08: ffff94cdc062b618 R09: ffff94ce1478= 0278 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703094] [=C2=A0= =C2=A0 T1628] R10: 0000000000000001 R11: ffff94cdc062b478 R12: ffff94ce1478= 0010 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703095] [=C2=A0= =C2=A0 T1628] R13: 0000000000000007 R14: 0000000000000004 R15: ffff94ce1478= 0010 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703096] [=C2=A0= =C2=A0 T1628] FS:=C2=A0 00007fc164276b00(0000) GS:ffff94dcb49cf000(0000) kn= lGS:0000000000000000 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703097] [=C2=A0= =C2=A0 T1628] CS:=C2=A0 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703098] [=C2=A0= =C2=A0 T1628] CR2: 00005647ccd53008 CR3: 000000012533f000 CR4: 000000000075= 0ef0 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703099] [=C2=A0= =C2=A0 T1628] PKRU: 55555554 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703100] [=C2=A0= =C2=A0 T1628] Call Trace: >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703101] [=C2=A0= =C2=A0 T1628]=C2=A0 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703104] [=C2=A0= =C2=A0 T1628]=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=C2=A0 8.703113] [=C2=A0= =C2=A0 T1628]=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=C2=A0 8.703119] [=C2=A0= =C2=A0 T1628]=C2=A0 drm_atomic_helper_plane_destroy_state+0x10/0x20 [drm_km= s_helper] >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703124] [=C2=A0= =C2=A0 T1628]=C2=A0 drm_atomic_state_default_clear+0x1c0/0x2e0 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703127] [=C2=A0= =C2=A0 T1628]=C2=A0 __drm_atomic_state_free+0x6c/0xb0 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703129] [=C2=A0= =C2=A0 T1628]=C2=A0 drm_atomic_helper_disable_plane+0x92/0xe0 [drm_kms_help= er] >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703135] [=C2=A0= =C2=A0 T1628]=C2=A0 drm_mode_cursor_universal+0xf2/0x2a0 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703140] [=C2=A0= =C2=A0 T1628]=C2=A0 drm_mode_cursor_common.part.0+0x9c/0x1e0 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703144] [=C2=A0= =C2=A0 T1628]=C2=A0 ? drm_mode_setplane+0x320/0x320 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703146] [=C2=A0= =C2=A0 T1628]=C2=A0 drm_mode_cursor_ioctl+0x8a/0xa0 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703148] [=C2=A0= =C2=A0 T1628]=C2=A0 drm_ioctl_kernel+0xa1/0xf0 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703151] [=C2=A0= =C2=A0 T1628]=C2=A0 drm_ioctl+0x26a/0x510 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703153] [=C2=A0= =C2=A0 T1628]=C2=A0 ? drm_mode_setplane+0x320/0x320 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703155] [=C2=A0= =C2=A0 T1628]=C2=A0 ? srso_alias_return_thunk+0x5/0xfbef5 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703157] [=C2=A0= =C2=A0 T1628]=C2=A0 ? rt_spin_unlock+0x12/0x40 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703159] [=C2=A0= =C2=A0 T1628]=C2=A0 ? do_setitimer+0x185/0x1d0 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703161] [=C2=A0= =C2=A0 T1628]=C2=A0 ? srso_alias_return_thunk+0x5/0xfbef5 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703164] [=C2=A0= =C2=A0 T1628]=C2=A0 amdgpu_drm_ioctl+0x46/0x90 [amdgpu] >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703283] [=C2=A0= =C2=A0 T1628]=C2=A0 __x64_sys_ioctl+0x91/0xe0 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703286] [=C2=A0= =C2=A0 T1628]=C2=A0 do_syscall_64+0x65/0xfc0 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703289] [=C2=A0= =C2=A0 T1628]=C2=A0 entry_SYSCALL_64_after_hwframe+0x55/0x5d >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703291] [=C2=A0= =C2=A0 T1628] RIP: 0033:0x7fc1645f78db >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703292] [=C2=A0= =C2=A0 T1628] Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 0= 0 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=C2=A0 8.703294] [=C2=A0= =C2=A0 T1628] RSP: 002b:00007ffd75bce430 EFLAGS: 00000246 ORIG_RAX: 0000000= 000000010 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703295] [=C2=A0= =C2=A0 T1628] RAX: ffffffffffffffda RBX: 000056224e896ea0 RCX: 00007fc1645f= 78db >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703296] [=C2=A0= =C2=A0 T1628] RDX: 00007ffd75bce4c0 RSI: 00000000c01c64a3 RDI: 000000000000= 000f >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703297] [=C2=A0= =C2=A0 T1628] RBP: 00007ffd75bce4c0 R08: 0000000000000100 R09: 000056221054= 7ab0 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703298] [=C2=A0= =C2=A0 T1628] R10: 000000000000004c R11: 0000000000000246 R12: 00000000c01c= 64a3 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703298] [=C2=A0= =C2=A0 T1628] R13: 000000000000000f R14: 0000000000000000 R15: 000056224e5c= 1cd0 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703302] [=C2=A0= =C2=A0 T1628]=C2=A0 >>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [=C2=A0=C2=A0=C2=A0 8.703303] [=C2=A0= =C2=A0 T1628] ---[ end trace 0000000000000000 ]--- >>>> >>>> As the warnings do not occur in next-20250702, I looked at the commits= given 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 f= ramebuffers"), >>>> 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= Root 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 Du= mmy Host Bridge >>>> 00:01.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe GPP= Bridge >>>> 00:02.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Du= mmy Host Bridge >>>> 00:02.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir/Cezanne = PCIe GPP Bridge >>>> 00:02.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir/Cezanne = PCIe GPP Bridge >>>> 00:02.3 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir/Cezanne = PCIe GPP Bridge >>>> 00:02.4 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir/Cezanne = PCIe GPP Bridge >>>> 00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Du= mmy Host Bridge >>>> 00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir Internal= PCIe 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 = (rev 51) >>>> 00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Cezanne Data F= abric; Function 0 >>>> 00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Cezanne Data F= abric; Function 1 >>>> 00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Cezanne Data F= abric; Function 2 >>>> 00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Cezanne Data F= abric; Function 3 >>>> 00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Cezanne Data F= abric; Function 4 >>>> 00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Cezanne Data F= abric; Function 5 >>>> 00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Cezanne Data F= abric; Function 6 >>>> 00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Cezanne Data F= abric; Function 7 >>>> 01:00.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] Navi 10 XL = Upstream Port of PCI Express Switch (rev c3) >>>> 02:00.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] Navi 10 XL = Downstream Port of PCI Express Switch >>>> 03:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Nav= i 23 [Radeon RX 6600/6600 XT/6600M] (rev c3) >>>> 03:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Navi 21/2= 3 HDMI/DP Audio Controller >>>> 04:00.0 Network controller: MEDIATEK Corp. MT7921K (RZ608) Wi-Fi 6E 80= MHz >>>> 05:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8= 168/8211/8411 PCI Express Gigabit Ethernet Controller (rev 15) >>>> 06:00.0 Non-Volatile memory controller: Kingston Technology Company, I= nc. KC3000/FURY Renegade NVMe SSD [E18] (rev 01) >>>> 07:00.0 Non-Volatile memory controller: Micron/Crucial Technology P1 N= VMe PCIe SSD[Frampton] (rev 03) >>>> 08:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/A= TI] Cezanne [Radeon Vega Series / Radeon Vega Mobile Series] (rev c5) >>>> 08:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Renoir Ra= deon High Definition Audio Controller >>>> 08:00.2 Encryption controller: Advanced Micro Devices, Inc. [AMD] Fami= ly 17h (Models 10h-1fh) Platform Security Processor >>>> 08:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Renoir/Ceza= nne USB 3.1 >>>> 08:00.4 USB controller: Advanced Micro Devices, Inc. [AMD] Renoir/Ceza= nne USB 3.1 >>>> 08:00.5 Multimedia controller: Advanced Micro Devices, Inc. [AMD] Audi= o Coprocessor (rev 01) >>>> 08:00.6 Audio device: Advanced Micro Devices, Inc. [AMD] Family 17h/19= h/1ah HD Audio Controller >>>> 08:00.7 Signal processing controller: Advanced Micro Devices, Inc. [AM= D] Sensor Fusion Hub >>>> >>>> >>>> Bert Karwatzki >=20