https://bugzilla.kernel.org/show_bug.cgi?id=212311
--- Comment #1 from Nirmoy (nirmoy.aiemd@gmail.com) --- DCN also calls into SMU which can sleep because of mutex_lock(&smu->mutex)
[ 6.547189] amdgpu 0000:44:00.0: amdgpu: SMU is initialized successfully! [ 6.547217] BUG: sleeping function called from invalid context at kernel/locking/mutex.c:935 [ 6.547248] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 581, name: kworker/6:2 [ 6.547262] 2 locks held by kworker/6:2/581: [ 6.547264] #0: ffff8906c7c59148 ((wq_completion)events){....}-{0:0}, at: process_one_work+0x1fb/0x4f0 [ 6.547275] #1: ffffa398447e3e68 ((work_completion)(&wfc.work)){....}-{0:0}, at: process_one_work+0x1fb/0x4f0 [ 6.547282] CPU: 6 PID: 581 Comm: kworker/6:2 Tainted: G E 5.11.0-1-default+ #171 [ 6.547285] Hardware name: Gigabyte Technology Co., Ltd. X399 DESIGNARE EX/X399 DESIGNARE EX-CF, BIOS F12i 09/24/2019 [ 6.547287] Workqueue: events work_for_cpu_fn [ 6.547291] Call Trace: [ 6.547296] dump_stack+0x6b/0x83 [ 6.547300] ___might_sleep.cold+0xa7/0xb7 [ 6.547305] ? smu_get_max_sustainable_clocks_by_dc+0x38/0x80 [amdgpu] [ 6.547494] __mutex_lock+0x45/0x8c0 [ 6.547500] ? ___slab_alloc+0x42d/0x640 [ 6.547505] smu_get_max_sustainable_clocks_by_dc+0x38/0x80 [amdgpu] [ 6.547654] pp_nv_get_maximum_sustainable_clocks+0x2f/0x50 [amdgpu] [ 6.547810] init_soc_bounding_box+0x111/0x200 [amdgpu] [ 6.547975] dcn20_resource_construct+0x440/0xd30 [amdgpu] [ 6.548134] ? fs_reclaim_release+0x46/0x80 [ 6.548138] ? dcn20_create_resource_pool+0x25/0x80 [amdgpu] [ 6.548294] ? kmem_cache_alloc_trace+0x1a4/0x360 [ 6.548296] ? __kmalloc+0x1c1/0x3c0 [ 6.548301] dcn20_create_resource_pool+0x3c/0x80 [amdgpu] [ 6.548457] dc_create_resource_pool+0x13f/0x1d0 [amdgpu] [ 6.548611] dc_create+0x203/0x7b0 [amdgpu] [ 6.548768] amdgpu_dm_init.isra.0+0x1de/0x270 [amdgpu] [ 6.548923] ? dev_vprintk_emit+0x12c/0x150 [ 6.548931] ? dev_printk_emit+0x4e/0x65 [ 6.548941] dm_hw_init+0xe/0x20 [amdgpu] [ 6.549094] amdgpu_device_init.cold+0x13e6/0x17ad [amdgpu] [ 6.549248] ? pci_bus_read_config_word+0x49/0x70 [ 6.549254] amdgpu_driver_load_kms+0x64/0x260 [amdgpu] [ 6.549376] amdgpu_pci_probe+0x122/0x1b0 [amdgpu] [ 6.549497] local_pci_probe+0x42/0x80 [ 6.549501] work_for_cpu_fn+0x16/0x20 [ 6.549503] process_one_work+0x28c/0x4f0 [ 6.549509] worker_thread+0x20d/0x3f0 [ 6.549512] ? rescuer_thread+0x390/0x390 [ 6.549515] kthread+0x13a/0x150 [ 6.549517] ? __kthread_bind_mask+0x60/0x60 [ 6.549521] ret_from_fork+0x22/0x30 [ 6.549969] [drm] Display Core initialized with v3.2.127!