BUG: sleeping function called from invalid context at kernel/locking/mutex.c:908
in_atomic(): 1, irqs_disabled(): 0, pid: 2491, name: kworker/0:2
12 locks held by kworker/0:2/2491:
 #0: 00000000751f5d6e ((wq_completion)usb_hub_wq){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline]
 #0: 00000000751f5d6e ((wq_completion)usb_hub_wq){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: 00000000751f5d6e ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline]
 #0: 00000000751f5d6e ((wq_completion)usb_hub_wq){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
 #0: 00000000751f5d6e ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data kernel/workqueue.c:619 [inline]
 #0: 00000000751f5d6e ((wq_completion)usb_hub_wq){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline]
 #0: 00000000751f5d6e ((wq_completion)usb_hub_wq){+.+.}, at: process_one_work+0x81a/0x1580 kernel/workqueue.c:2240
 #1: 00000000d6317963 ((work_completion)(&hub->events)){+.+.}, at: process_one_work+0x84e/0x1580 kernel/workqueue.c:2244
 #2: 00000000c652e6b4 (&dev->mutex){....}, at: device_lock include/linux/device.h:1207 [inline]
 #2: 00000000c652e6b4 (&dev->mutex){....}, at: hub_event+0x179/0x35a0 drivers/usb/core/hub.c:5378
 #3: 00000000da9386d5 (&dev->mutex){....}, at: device_lock include/linux/device.h:1207 [inline]
 #3: 00000000da9386d5 (&dev->mutex){....}, at: __device_attach+0x7b/0x360 drivers/base/dd.c:821
 #4: 0000000014dbaec7 (&dev->mutex){....}, at: device_lock include/linux/device.h:1207 [inline]
 #4: 0000000014dbaec7 (&dev->mutex){....}, at: __device_attach+0x7b/0x360 drivers/base/dd.c:821
 #5: 000000009f7d73d4 (drm_global_mutex){+.+.}, at: drm_dev_register+0x4a/0x530 drivers/gpu/drm/drm_drv.c:782
 #6: 0000000051dff9bc (&helper->lock){+.+.}, at: drm_fb_helper_initial_config drivers/gpu/drm/drm_fb_helper.c:2818 [inline]
 #6: 0000000051dff9bc (&helper->lock){+.+.}, at: drm_fb_helper_initial_config+0x3b/0x60 drivers/gpu/drm/drm_fb_helper.c:2811
 #7: 000000004a12ffc4 (&dev->mode_config.mutex){+.+.}, at: drm_modeset_lock_all+0x67/0x560 drivers/gpu/drm/drm_modeset_lock.c:105
 #8: 000000002d3cfa1b (crtc_ww_class_acquire){+.+.}, at: drm_modeset_lock_all+0x71/0x560 drivers/gpu/drm/drm_modeset_lock.c:107
 #9: 0000000079432109 (crtc_ww_class_mutex){+.+.}, at: modeset_lock drivers/gpu/drm/drm_modeset_lock.c:263 [inline]
 #9: 0000000079432109 (crtc_ww_class_mutex){+.+.}, at: drm_modeset_lock drivers/gpu/drm/drm_modeset_lock.c:342 [inline]
 #9: 0000000079432109 (crtc_ww_class_mutex){+.+.}, at: drm_modeset_lock+0x170/0x420 drivers/gpu/drm/drm_modeset_lock.c:338
 #10: 000000001bf5cae5 (console_lock){+.+.}, at: console_trylock_spinning kernel/printk/printk.c:1699 [inline]
 #10: 000000001bf5cae5 (console_lock){+.+.}, at: vprintk_emit+0x155/0x3a0 kernel/printk/printk.c:1974
 #11: 00000000e28be726 ((&toneport->timer)){+.-.}, at: lockdep_copy_map include/linux/lockdep.h:170 [inline]
 #11: 00000000e28be726 ((&toneport->timer)){+.-.}, at: call_timer_fn+0xc9/0x5e0 kernel/time/timer.c:1315
CPU: 0 PID: 2491 Comm: kworker/0:2 Not tainted 5.1.0-rc3+ #8
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0xca/0x13e lib/dump_stack.c:113
 ___might_sleep.cold+0x10f/0x129 kernel/sched/core.c:6190
 __mutex_lock_common kernel/locking/mutex.c:908 [inline]
 __mutex_lock+0xc8/0x12b0 kernel/locking/mutex.c:1072
 line6_pcm_acquire+0x30/0x210 sound/usb/line6/pcm.c:311
 call_timer_fn+0x15c/0x5e0 kernel/time/timer.c:1325
 expire_timers kernel/time/timer.c:1362 [inline]
 __run_timers kernel/time/timer.c:1681 [inline]
 __run_timers kernel/time/timer.c:1649 [inline]
 run_timer_softirq+0x586/0x1400 kernel/time/timer.c:1694
 __do_softirq+0x21f/0x8bc kernel/softirq.c:293
 invoke_softirq kernel/softirq.c:374 [inline]
 irq_exit+0x17c/0x1a0 kernel/softirq.c:414
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0xf1/0x490 arch/x86/kernel/apic/apic.c:1062
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:81 [inline]
RIP: 0010:console_unlock+0x98e/0xb70 kernel/printk/printk.c:2460
Code: 00 89 ee 48 c7 c7 40 24 d3 86 e8 cd a4 03 00 65 ff 0d 06 79 da 7e e9 5e fa ff ff e8 0c 03 15 00 e8 c7 1b 1a 00 ff 74 24 30 9d <e9> 2d fe ff ff e8 f8 02 15 00 48 8b bc 24 80 00 00 00 c7 05 e6 48
RSP: 0018:ffff8881d18c6a80 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000007 RBX: 0000000000000200 RCX: 1ffff1103a30373d
RDX: 0000000000000000 RSI: ffff8881d181b9c8 RDI: ffff8881d181b834
RBP: 0000000000000000 R08: ffff8881d181b000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000052
R13: ffffffff828a0a60 R14: 0000000000000001 R15: dffffc0000000000
 vprintk_emit+0x16e/0x3a0 kernel/printk/printk.c:1975
 vprintk_func+0x75/0x113 kernel/printk/printk_safe.c:398
 printk+0xba/0xed kernel/printk/printk.c:2035
 drm_err+0xdc/0x110 drivers/gpu/drm/drm_print.c:250
 udl_submit_urb+0x137/0x180 drivers/gpu/drm/udl/udl_main.c:309
 udl_crtc_dpms+0x5b8/0x6f0 drivers/gpu/drm/udl/udl_modeset.c:270
 __drm_helper_disable_unused_functions+0x11f/0x2e0 drivers/gpu/drm/drm_crtc_helper.c:190
 drm_crtc_helper_disable drivers/gpu/drm/drm_crtc_helper.c:478 [inline]
 drm_crtc_helper_set_config+0x1d15/0x2620 drivers/gpu/drm/drm_crtc_helper.c:561
 __drm_mode_set_config_internal+0x2b6/0x600 drivers/gpu/drm/drm_crtc.c:443
 restore_fbdev_mode_legacy drivers/gpu/drm/drm_fb_helper.c:502 [inline]
 restore_fbdev_mode+0x31a/0x550 drivers/gpu/drm/drm_fb_helper.c:519
 drm_fb_helper_single_fb_probe drivers/gpu/drm/drm_fb_helper.c:2022 [inline]
 __drm_fb_helper_initial_config_and_unlock.cold+0xff/0x2c2 drivers/gpu/drm/drm_fb_helper.c:2723
 drm_fb_helper_initial_config drivers/gpu/drm/drm_fb_helper.c:2819 [inline]
 drm_fb_helper_initial_config+0x46/0x60 drivers/gpu/drm/drm_fb_helper.c:2811
 udl_fbdev_init+0x130/0x180 drivers/gpu/drm/udl/udl_fb.c:468
 udl_driver_load+0xa5c/0xfa0 drivers/gpu/drm/udl/udl_main.c:350
 drm_dev_register+0x3b2/0x530 drivers/gpu/drm/drm_drv.c:799
 udl_usb_probe+0x6d/0xbf drivers/gpu/drm/udl/udl_drv.c:88
 usb_probe_interface+0x30d/0x7b0 drivers/usb/core/driver.c:361
 really_probe+0x296/0x680 drivers/base/dd.c:509
 driver_probe_device+0xf9/0x200 drivers/base/dd.c:671
 __device_attach_driver+0x1c4/0x230 drivers/base/dd.c:778
 bus_for_each_drv+0x15e/0x1e0 drivers/base/bus.c:454
 __device_attach+0x21e/0x360 drivers/base/dd.c:844
 bus_probe_device+0x1ec/0x2a0 drivers/base/bus.c:514
 device_add+0xaf4/0x1700 drivers/base/core.c:2106
 usb_set_configuration+0xdf2/0x1670 drivers/usb/core/message.c:2023
 generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
 usb_probe_device+0xa8/0x110 drivers/usb/core/driver.c:266
 really_probe+0x296/0x680 drivers/base/dd.c:509
 driver_probe_device+0xf9/0x200 drivers/base/dd.c:671
 __device_attach_driver+0x1c4/0x230 drivers/base/dd.c:778
 bus_for_each_drv+0x15e/0x1e0 drivers/base/bus.c:454
 __device_attach+0x21e/0x360 drivers/base/dd.c:844
 bus_probe_device+0x1ec/0x2a0 drivers/base/bus.c:514
 device_add+0xaf4/0x1700 drivers/base/core.c:2106
 usb_new_device.cold+0x8b8/0x1030 drivers/usb/core/hub.c:2534
 hub_port_connect drivers/usb/core/hub.c:5089 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5204 [inline]
 port_event drivers/usb/core/hub.c:5350 [inline]
 hub_event+0x1ac9/0x35a0 drivers/usb/core/hub.c:5432
 process_one_work+0x90a/0x1580 kernel/workqueue.c:2269
 process_scheduled_works kernel/workqueue.c:2331 [inline]
 worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417
 kthread+0x30e/0x420 kernel/kthread.c:253
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
==================================================================
BUG: KASAN: null-ptr-deref in memset include/linux/string.h:337 [inline]
BUG: KASAN: null-ptr-deref in submit_audio_out_urb+0x919/0x1780 sound/usb/line6/playback.c:246
Write of size 20 at addr 0000000000000010 by task kworker/0:2/2491

CPU: 0 PID: 2491 Comm: kworker/0:2 Tainted: G        W         5.1.0-rc3+ #8
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0xca/0x13e lib/dump_stack.c:113
 kasan_report.cold+0x5/0x35 mm/kasan/report.c:321
 memset+0x20/0x40 mm/kasan/common.c:115
 memset include/linux/string.h:337 [inline]
 submit_audio_out_urb+0x919/0x1780 sound/usb/line6/playback.c:246
 line6_submit_audio_out_all_urbs+0xc9/0x120 sound/usb/line6/playback.c:295
 line6_stream_start+0x156/0x1f0 sound/usb/line6/pcm.c:199
 line6_pcm_acquire+0x134/0x210 sound/usb/line6/pcm.c:322
 call_timer_fn+0x15c/0x5e0 kernel/time/timer.c:1325
 expire_timers kernel/time/timer.c:1362 [inline]
 __run_timers kernel/time/timer.c:1681 [inline]
 __run_timers kernel/time/timer.c:1649 [inline]
 run_timer_softirq+0x586/0x1400 kernel/time/timer.c:1694
 __do_softirq+0x21f/0x8bc kernel/softirq.c:293
 invoke_softirq kernel/softirq.c:374 [inline]
 irq_exit+0x17c/0x1a0 kernel/softirq.c:414
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0xf1/0x490 arch/x86/kernel/apic/apic.c:1062
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:81 [inline]
RIP: 0010:console_unlock+0x98e/0xb70 kernel/printk/printk.c:2460
Code: 00 89 ee 48 c7 c7 40 24 d3 86 e8 cd a4 03 00 65 ff 0d 06 79 da 7e e9 5e fa ff ff e8 0c 03 15 00 e8 c7 1b 1a 00 ff 74 24 30 9d <e9> 2d fe ff ff e8 f8 02 15 00 48 8b bc 24 80 00 00 00 c7 05 e6 48
RSP: 0018:ffff8881d18c6a80 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000007 RBX: 0000000000000200 RCX: 1ffff1103a30373d
RDX: 0000000000000000 RSI: ffff8881d181b9c8 RDI: ffff8881d181b834
RBP: 0000000000000000 R08: ffff8881d181b000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000052
R13: ffffffff828a0a60 R14: 0000000000000001 R15: dffffc0000000000
 vprintk_emit+0x16e/0x3a0 kernel/printk/printk.c:1975
 vprintk_func+0x75/0x113 kernel/printk/printk_safe.c:398
 printk+0xba/0xed kernel/printk/printk.c:2035
 drm_err+0xdc/0x110 drivers/gpu/drm/drm_print.c:250
 udl_submit_urb+0x137/0x180 drivers/gpu/drm/udl/udl_main.c:309
 udl_crtc_dpms+0x5b8/0x6f0 drivers/gpu/drm/udl/udl_modeset.c:270
 __drm_helper_disable_unused_functions+0x11f/0x2e0 drivers/gpu/drm/drm_crtc_helper.c:190
 drm_crtc_helper_disable drivers/gpu/drm/drm_crtc_helper.c:478 [inline]
 drm_crtc_helper_set_config+0x1d15/0x2620 drivers/gpu/drm/drm_crtc_helper.c:561
 __drm_mode_set_config_internal+0x2b6/0x600 drivers/gpu/drm/drm_crtc.c:443
 restore_fbdev_mode_legacy drivers/gpu/drm/drm_fb_helper.c:502 [inline]
 restore_fbdev_mode+0x31a/0x550 drivers/gpu/drm/drm_fb_helper.c:519
 drm_fb_helper_single_fb_probe drivers/gpu/drm/drm_fb_helper.c:2022 [inline]
 __drm_fb_helper_initial_config_and_unlock.cold+0xff/0x2c2 drivers/gpu/drm/drm_fb_helper.c:2723
 drm_fb_helper_initial_config drivers/gpu/drm/drm_fb_helper.c:2819 [inline]
 drm_fb_helper_initial_config+0x46/0x60 drivers/gpu/drm/drm_fb_helper.c:2811
 udl_fbdev_init+0x130/0x180 drivers/gpu/drm/udl/udl_fb.c:468
 udl_driver_load+0xa5c/0xfa0 drivers/gpu/drm/udl/udl_main.c:350
 drm_dev_register+0x3b2/0x530 drivers/gpu/drm/drm_drv.c:799
 udl_usb_probe+0x6d/0xbf drivers/gpu/drm/udl/udl_drv.c:88
 usb_probe_interface+0x30d/0x7b0 drivers/usb/core/driver.c:361
 really_probe+0x296/0x680 drivers/base/dd.c:509
 driver_probe_device+0xf9/0x200 drivers/base/dd.c:671
 __device_attach_driver+0x1c4/0x230 drivers/base/dd.c:778
 bus_for_each_drv+0x15e/0x1e0 drivers/base/bus.c:454
 __device_attach+0x21e/0x360 drivers/base/dd.c:844
 bus_probe_device+0x1ec/0x2a0 drivers/base/bus.c:514
 device_add+0xaf4/0x1700 drivers/base/core.c:2106
 usb_set_configuration+0xdf2/0x1670 drivers/usb/core/message.c:2023
 generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
 usb_probe_device+0xa8/0x110 drivers/usb/core/driver.c:266
 really_probe+0x296/0x680 drivers/base/dd.c:509
 driver_probe_device+0xf9/0x200 drivers/base/dd.c:671
 __device_attach_driver+0x1c4/0x230 drivers/base/dd.c:778
 bus_for_each_drv+0x15e/0x1e0 drivers/base/bus.c:454
 __device_attach+0x21e/0x360 drivers/base/dd.c:844
 bus_probe_device+0x1ec/0x2a0 drivers/base/bus.c:514
 device_add+0xaf4/0x1700 drivers/base/core.c:2106
 usb_new_device.cold+0x8b8/0x1030 drivers/usb/core/hub.c:2534
 hub_port_connect drivers/usb/core/hub.c:5089 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5204 [inline]
 port_event drivers/usb/core/hub.c:5350 [inline]
 hub_event+0x1ac9/0x35a0 drivers/usb/core/hub.c:5432
 process_one_work+0x90a/0x1580 kernel/workqueue.c:2269
 process_scheduled_works kernel/workqueue.c:2331 [inline]
 worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417
 kthread+0x30e/0x420 kernel/kthread.c:253
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
==================================================================