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Subject4.16-rc1: UBSAN warning in nouveau/nvkm/subdev/therm/base.c + oops in nvkm_therm_clkgate_fini
This is 4.16-rc1+todays git ona lowly P4 with NV5, worked fine in 4.15:

[ 7.361155] nouveau 0000:01:00.0: NVIDIA NV05 (20154000)
[ 7.386601] nouveau 0000:01:00.0: bios: version 02.05.19.03.00
[ 7.386715] nouveau 0000:01:00.0: bios: DCB table not found
[ 7.386983] nouveau 0000:01:00.0: bios: DCB table not found
[ 7.387166] nouveau 0000:01:00.0: bios: DCB table not found
[ 7.387266] nouveau 0000:01:00.0: bios: DCB table not found
[ 7.397578] agpgart-intel 0000:00:00.0: AGP 2.0 bridge
[ 7.397705] agpgart-intel 0000:00:00.0: putting AGP V2 device into 4x mode
[ 7.397827] nouveau 0000:01:00.0: putting AGP V2 device into 4x mode
[ 7.398021] ================================================================================
[ 7.398163] UBSAN: Undefined behaviour in drivers/gpu/drm/nouveau/nvkm/subdev/therm/base.c:315:12
[ 7.398302] member access within null pointer of type 'struct nvkm_therm'
[ 7.398403] CPU: 0 PID: 125 Comm: systemd-udevd Not tainted 4.16.0-rc1-00010-g178e834c47b0 #65
[ 7.398543] Hardware name: /D850GB , BIOS GB85010A.86A.0078.P18.0110081719 10/08/2001
[ 7.398686] Call Trace:
[ 7.398788] dump_stack+0x16/0x18
[ 7.398885] ubsan_epilogue+0xe/0x2f
[ 7.398979] ubsan_type_mismatch_common+0xdc/0x152
[ 7.399079] __ubsan_handle_type_mismatch+0x24/0x26
[ 7.399368] nvkm_therm_clkgate_fini+0x14d/0x174 [nouveau]
[ 7.399638] ? nvkm_device_subdev+0x1b9/0x1fa [nouveau]
[ 7.399907] nvkm_device_fini+0x113/0x3e9 [nouveau]
[ 7.400010] ? ktime_get+0x4b/0x135
[ 7.400253] ? nvkm_devinit_post+0x35/0xbf [nouveau]
[ 7.400519] nvkm_device_init+0x228/0x5b0 [nouveau]
[ 7.400626] ? kmem_cache_alloc+0xbd/0x12a
[ 7.400893] nvkm_udevice_init+0x51/0xa9 [nouveau]
[ 7.401137] nvkm_object_init+0xc8/0x442 [nouveau]
[ 7.401244] ? check_preempt_wakeup+0xc2/0x1c1
[ 7.401487] ? nvkm_client_child_new+0x1d/0x38 [nouveau]
[ 7.401729] nvkm_ioctl_new+0x152/0x3d9 [nouveau]
[ 7.401835] ? default_wake_function+0x1a/0x35
[ 7.402077] ? nvif_vmm_init+0x2ce/0x2ce [nouveau]
[ 7.402345] ? nvkm_udevice_rd08+0x5b/0x5b [nouveau]
[ 7.402587] nvkm_ioctl+0x1c6/0x48d [nouveau]
[ 7.402829] ? nvif_client_init+0xc3/0x114 [nouveau]
[ 7.403094] ? nvkm_client_map+0xf/0xf [nouveau]
[ 7.403382] nvkm_client_ioctl+0x1c/0x22 [nouveau]
[ 7.403643] nvif_object_ioctl+0x6f/0xff [nouveau]
[ 7.403903] nvif_object_init+0xd4/0x1de [nouveau]
[ 7.404164] nvif_device_init+0x21/0x5c [nouveau]
[ 7.404453] nouveau_cli_init+0x21f/0xe1f [nouveau]
[ 7.404733] ? nouveau_drm_load+0x1d/0xe11 [nouveau]
[ 7.405011] nouveau_drm_load+0x54/0xe11 [nouveau]
[ 7.405112] ? kernfs_new_node+0x2b/0x8e
[ 7.405209] ? kernfs_create_link+0x55/0xcd
[ 7.405323] ? drm_dev_register+0x12f/0x2e0 [drm]
[ 7.405437] drm_dev_register+0x168/0x2e0 [drm]
[ 7.405538] ? pci_enable_device_flags+0xeb/0x15e
[ 7.405651] drm_get_pci_dev+0xbf/0x230 [drm]
[ 7.405924] nouveau_drm_probe+0x183/0x1ea [nouveau]
[ 7.406035] pci_device_probe+0xaa/0x163
[ 7.406136] driver_probe_device+0x1db/0x383
[ 7.406234] __driver_attach+0x86/0xb8
[ 7.406330] ? driver_probe_device+0x383/0x383
[ 7.406427] bus_for_each_dev+0x4e/0x83
[ 7.406522] driver_attach+0x1d/0x33
[ 7.406618] ? driver_probe_device+0x383/0x383
[ 7.406714] bus_add_driver+0x184/0x273
[ 7.406810] driver_register+0x66/0x107
[ 7.407039] ? nouveau_drm_init+0x66/0x1000 [nouveau]
[ 7.407146] __pci_register_driver+0x47/0x71
[ 7.407379] nouveau_drm_init+0x18a/0x1000 [nouveau]
[ 7.407478] ? 0xf831a000
[ 7.407575] do_one_initcall+0x4f/0x1e2
[ 7.407672] ? free_unref_page_commit.isra.88+0xd5/0x176
[ 7.407771] ? kvfree+0x3c/0x3e
[ 7.407864] ? __vunmap+0x89/0xef
[ 7.407960] ? do_init_module+0x1a/0x23f
[ 7.408055] do_init_module+0x82/0x23f
[ 7.408153] load_module+0x243c/0x36ae
[ 7.408253] ? kernel_read+0x4c/0xa1
[ 7.408350] SyS_finit_module+0x78/0x8d
[ 7.408447] do_fast_syscall_32+0xc1/0x31b
[ 7.408545] entry_SYSENTER_32+0x4e/0x7c
[ 7.408640] EIP: 0xb7ee9ad5
[ 7.408730] EFLAGS: 00000296 CPU: 0
[ 7.408823] EAX: ffffffda EBX: 00000019 ECX: b7ce0bdd EDX: 00000000
[ 7.408920] ESI: 00eb6670 EDI: 00ebe610 EBP: 00000000 ESP: bff8704c
[ 7.409017] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b
[ 7.409113] ================================================================================
[ 7.409344] BUG: unable to handle kernel NULL pointer dereference at (null)
[ 7.409640] IP: nvkm_therm_clkgate_fini+0x15/0x174 [nouveau]
[ 7.409738] *pde = 00000000
[ 7.409833] Oops: 0000 [#1]
[ 7.409923] Modules linked in: nouveau(+) evdev wmi video i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops uhci_hcd ttm ehci_hcd usbcore drm pcspkr psmouse sr_mod cdrom sg drm_panel_orientation_quirks parport_pc floppy i2c_i801 parport usb_common snd_intel8x0 snd_ac97_codec button rng_core ac97_bus snd_pcm snd_timer snd soundcore eeprom adm1031 adm1025 hwmon_vid i2c_core ip_tables x_tables ipv6 autofs4
[ 7.410357] CPU: 0 PID: 125 Comm: systemd-udevd Not tainted 4.16.0-rc1-00010-g178e834c47b0 #65
[ 7.410499] Hardware name: /D850GB , BIOS GB85010A.86A.0078.P18.0110081719 10/08/2001
[ 7.410824] EIP: nvkm_therm_clkgate_fini+0x15/0x174 [nouveau]
[ 7.410921] EFLAGS: 00010286 CPU: 0
[ 7.411014] EAX: f6b3b800 EBX: 00000000 ECX: 00000006 EDX: 00000007
[ 7.411109] ESI: 00000000 EDI: 00000000 EBP: f6155858 ESP: f6155834
[ 7.411205] DS: 007b ES: 007b FS: 0000 GS: 00e0 SS: 0068
[ 7.411299] CR0: 80050033 CR2: 00000000 CR3: 3614b000 CR4: 000006d0
[ 7.411395] Call Trace:
[ 7.411662] ? nvkm_device_subdev+0x1b9/0x1fa [nouveau]
[ 7.411926] nvkm_device_fini+0x113/0x3e9 [nouveau]
[ 7.412030] ? ktime_get+0x4b/0x135
[ 7.412274] ? nvkm_devinit_post+0x35/0xbf [nouveau]
[ 7.412536] nvkm_device_init+0x228/0x5b0 [nouveau]
[ 7.412640] ? kmem_cache_alloc+0xbd/0x12a
[ 7.412906] nvkm_udevice_init+0x51/0xa9 [nouveau]
[ 7.413146] nvkm_object_init+0xc8/0x442 [nouveau]
[ 7.413248] ? check_preempt_wakeup+0xc2/0x1c1
[ 7.413602] ? nvkm_client_child_new+0x1d/0x38 [nouveau]
[ 7.413956] nvkm_ioctl_new+0x152/0x3d9 [nouveau]
[ 7.414055] ? default_wake_function+0x1a/0x35
[ 7.414409] ? nvif_vmm_init+0x2ce/0x2ce [nouveau]
[ 7.414788] ? nvkm_udevice_rd08+0x5b/0x5b [nouveau]
[ 7.415150] nvkm_ioctl+0x1c6/0x48d [nouveau]
[ 7.416466] ? nvif_client_init+0xc3/0x114 [nouveau]
[ 7.416832] ? nvkm_client_map+0xf/0xf [nouveau]
[ 7.417201] nvkm_client_ioctl+0x1c/0x22 [nouveau]
[ 7.417554] nvif_object_ioctl+0x6f/0xff [nouveau]
[ 7.417909] nvif_object_init+0xd4/0x1de [nouveau]
[ 7.418271] nvif_device_init+0x21/0x5c [nouveau]
[ 7.418536] nouveau_cli_init+0x21f/0xe1f [nouveau]
[ 7.418799] ? nouveau_drm_load+0x1d/0xe11 [nouveau]
[ 7.419058] nouveau_drm_load+0x54/0xe11 [nouveau]
[ 7.419158] ? kernfs_new_node+0x2b/0x8e
[ 7.419255] ? kernfs_create_link+0x55/0xcd
[ 7.419369] ? drm_dev_register+0x12f/0x2e0 [drm]
[ 7.419496] drm_dev_register+0x168/0x2e0 [drm]
[ 7.419596] ? pci_enable_device_flags+0xeb/0x15e
[ 7.419724] drm_get_pci_dev+0xbf/0x230 [drm]
[ 7.420102] nouveau_drm_probe+0x183/0x1ea [nouveau]
[ 7.420207] pci_device_probe+0xaa/0x163
[ 7.420305] driver_probe_device+0x1db/0x383
[ 7.420402] __driver_attach+0x86/0xb8
[ 7.420497] ? driver_probe_device+0x383/0x383
[ 7.420597] bus_for_each_dev+0x4e/0x83
[ 7.420694] driver_attach+0x1d/0x33
[ 7.420790] ? driver_probe_device+0x383/0x383
[ 7.420886] bus_add_driver+0x184/0x273
[ 7.420983] driver_register+0x66/0x107
[ 7.421215] ? nouveau_drm_init+0x66/0x1000 [nouveau]
[ 7.421322] __pci_register_driver+0x47/0x71
[ 7.421555] nouveau_drm_init+0x18a/0x1000 [nouveau]
[ 7.421654] ? 0xf831a000
[ 7.421751] do_one_initcall+0x4f/0x1e2
[ 7.421850] ? free_unref_page_commit.isra.88+0xd5/0x176
[ 7.421947] ? kvfree+0x3c/0x3e
[ 7.422041] ? __vunmap+0x89/0xef
[ 7.422136] ? do_init_module+0x1a/0x23f
[ 7.422232] do_init_module+0x82/0x23f
[ 7.422329] load_module+0x243c/0x36ae
[ 7.422428] ? kernel_read+0x4c/0xa1
[ 7.422524] SyS_finit_module+0x78/0x8d
[ 7.422624] do_fast_syscall_32+0xc1/0x31b
[ 7.422722] entry_SYSENTER_32+0x4e/0x7c
[ 7.422817] EIP: 0xb7ee9ad5
[ 7.422907] EFLAGS: 00000296 CPU: 0
[ 7.423001] EAX: ffffffda EBX: 00000019 ECX: b7ce0bdd EDX: 00000000
[ 7.423098] ESI: 00eb6670 EDI: 00ebe610 EBP: 00000000 ESP: bff8704c
[ 7.423195] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b
[ 7.423291] Code: e9 30 ff ff ff 31 d2 b8 78 cf b0 f8 e8 ba 07 a2 c8 e9 0f ff ff ff 55 89 e5 57 56 53 83 ec 18 89 c3 89 d6 85 c0 0f 84 2c 01 00 00 <8b> 3b 85 ff 0f 84 11 01 00 00 8b 47 30 85 c0 0f 84 a1 00 00 00
[ 7.423757] EIP: nvkm_therm_clkgate_fini+0x15/0x174 [nouveau] SS:ESP: 0068:f6155834
[ 7.423899] CR2: 0000000000000000
[ 7.424033] ---[ end trace cad535783d11d7b9 ]---

--
Meelis Roos (mroos@linux.ee)

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