INFO: task kworker/0:1:7 blocked for more than 143 seconds. Not tainted 5.12.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:1 state:D stack:25464 pid: 7 ppid: 2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:4322 [inline] __schedule+0x8d9/0x2160 kernel/sched/core.c:5073 schedule+0xcf/0x270 kernel/sched/core.c:5152 schedule_timeout+0x19d/0x210 kernel/time/timer.c:1868 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x168/0x270 kernel/sched/completion.c:138 cleanup_rng drivers/char/hw_random/core.c:81 [inline] kref_put include/linux/kref.h:65 [inline] drop_current_rng+0x79/0xa0 drivers/char/hw_random/core.c:109 set_current_rng+0x1fb/0x310 drivers/char/hw_random/core.c:96 hwrng_register+0x328/0x500 drivers/char/hw_random/core.c:505 chaoskey_probe+0x7a6/0xb50 drivers/usb/misc/chaoskey.c:205 usb_probe_interface+0x274/0x6a0 drivers/usb/core/driver.c:396 really_probe+0x1fd/0xc60 drivers/base/dd.c:557 driver_probe_device+0x1ed/0x380 drivers/base/dd.c:743 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:431 __device_attach+0x1db/0x400 drivers/base/dd.c:917 bus_probe_device+0x19d/0x250 drivers/base/bus.c:491 device_add+0x9eb/0x1ad0 drivers/base/core.c:3242 usb_set_configuration+0x9fc/0x1750 drivers/usb/core/message.c:2164 usb_generic_driver_probe+0x74/0xa0 drivers/usb/core/generic.c:238 usb_probe_device+0x98/0x240 drivers/usb/core/driver.c:293 really_probe+0x1fd/0xc60 drivers/base/dd.c:557 driver_probe_device+0x1ed/0x380 drivers/base/dd.c:743 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:431 __device_attach+0x1db/0x400 drivers/base/dd.c:917 bus_probe_device+0x19d/0x250 drivers/base/bus.c:491 device_add+0x9eb/0x1ad0 drivers/base/core.c:3242 usb_new_device.cold+0x69a/0xee1 drivers/usb/core/hub.c:2555 hub_port_connect drivers/usb/core/hub.c:5223 [inline] hub_port_connect_change drivers/usb/core/hub.c:5363 [inline] port_event drivers/usb/core/hub.c:5509 [inline] hub_event+0x10a3/0x36b0 drivers/usb/core/hub.c:5591 process_one_work+0x84c/0x13b0 kernel/workqueue.c:2275 worker_thread+0x598/0xf80 kernel/workqueue.c:2421 kthread+0x36f/0x450 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task kworker/1:1:35 blocked for more than 143 seconds. Not tainted 5.12.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:1 state:D stack:25512 pid: 35 ppid: 2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:4322 [inline] __schedule+0x8d9/0x2160 kernel/sched/core.c:5073 schedule+0xcf/0x270 kernel/sched/core.c:5152 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5211 __mutex_lock_common kernel/locking/mutex.c:1026 [inline] __mutex_lock+0x81f/0x1120 kernel/locking/mutex.c:1096 hwrng_register+0x6b/0x500 drivers/char/hw_random/core.c:478 chaoskey_probe+0x7a6/0xb50 drivers/usb/misc/chaoskey.c:205 usb_probe_interface+0x274/0x6a0 drivers/usb/core/driver.c:396 really_probe+0x1fd/0xc60 drivers/base/dd.c:557 driver_probe_device+0x1ed/0x380 drivers/base/dd.c:743 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:431 __device_attach+0x1db/0x400 drivers/base/dd.c:917 bus_probe_device+0x19d/0x250 drivers/base/bus.c:491 device_add+0x9eb/0x1ad0 drivers/base/core.c:3242 usb_set_configuration+0x9fc/0x1750 drivers/usb/core/message.c:2164 usb_generic_driver_probe+0x74/0xa0 drivers/usb/core/generic.c:238 usb_probe_device+0x98/0x240 drivers/usb/core/driver.c:293 really_probe+0x1fd/0xc60 drivers/base/dd.c:557 driver_probe_device+0x1ed/0x380 drivers/base/dd.c:743 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:431 __device_attach+0x1db/0x400 drivers/base/dd.c:917 bus_probe_device+0x19d/0x250 drivers/base/bus.c:491 device_add+0x9eb/0x1ad0 drivers/base/core.c:3242 usb_new_device.cold+0x69a/0xee1 drivers/usb/core/hub.c:2555 hub_port_connect drivers/usb/core/hub.c:5223 [inline] hub_port_connect_change drivers/usb/core/hub.c:5363 [inline] port_event drivers/usb/core/hub.c:5509 [inline] hub_event+0x10a3/0x36b0 drivers/usb/core/hub.c:5591 process_one_work+0x84c/0x13b0 kernel/workqueue.c:2275 worker_thread+0x598/0xf80 kernel/workqueue.c:2421 kthread+0x36f/0x450 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task kworker/0:2:257 blocked for more than 144 seconds. Not tainted 5.12.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:2 state:D stack:25904 pid: 257 ppid: 2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:4322 [inline] __schedule+0x8d9/0x2160 kernel/sched/core.c:5073 schedule+0xcf/0x270 kernel/sched/core.c:5152 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5211 __mutex_lock_common kernel/locking/mutex.c:1026 [inline] __mutex_lock+0x81f/0x1120 kernel/locking/mutex.c:1096 hwrng_register+0x6b/0x500 drivers/char/hw_random/core.c:478 chaoskey_probe+0x7a6/0xb50 drivers/usb/misc/chaoskey.c:205 usb_probe_interface+0x274/0x6a0 drivers/usb/core/driver.c:396 really_probe+0x1fd/0xc60 drivers/base/dd.c:557 driver_probe_device+0x1ed/0x380 drivers/base/dd.c:743 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:431 __device_attach+0x1db/0x400 drivers/base/dd.c:917 bus_probe_device+0x19d/0x250 drivers/base/bus.c:491 device_add+0x9eb/0x1ad0 drivers/base/core.c:3242 usb_set_configuration+0x9fc/0x1750 drivers/usb/core/message.c:2164 usb_generic_driver_probe+0x74/0xa0 drivers/usb/core/generic.c:238 usb_probe_device+0x98/0x240 drivers/usb/core/driver.c:293 really_probe+0x1fd/0xc60 drivers/base/dd.c:557 driver_probe_device+0x1ed/0x380 drivers/base/dd.c:743 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:431 __device_attach+0x1db/0x400 drivers/base/dd.c:917 bus_probe_device+0x19d/0x250 drivers/base/bus.c:491 device_add+0x9eb/0x1ad0 drivers/base/core.c:3242 usb_new_device.cold+0x69a/0xee1 drivers/usb/core/hub.c:2555 hub_port_connect drivers/usb/core/hub.c:5223 [inline] hub_port_connect_change drivers/usb/core/hub.c:5363 [inline] port_event drivers/usb/core/hub.c:5509 [inline] hub_event+0x10a3/0x36b0 drivers/usb/core/hub.c:5591 process_one_work+0x84c/0x13b0 kernel/workqueue.c:2275 worker_thread+0x598/0xf80 kernel/workqueue.c:2421 kthread+0x36f/0x450 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task kworker/1:3:8639 blocked for more than 145 seconds. Not tainted 5.12.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:3 state:D stack:24560 pid: 8639 ppid: 2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:4322 [inline] __schedule+0x8d9/0x2160 kernel/sched/core.c:5073 schedule+0xcf/0x270 kernel/sched/core.c:5152 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5211 __mutex_lock_common kernel/locking/mutex.c:1026 [inline] __mutex_lock+0x81f/0x1120 kernel/locking/mutex.c:1096 hwrng_register+0x6b/0x500 drivers/char/hw_random/core.c:478 chaoskey_probe+0x7a6/0xb50 drivers/usb/misc/chaoskey.c:205 usb_probe_interface+0x274/0x6a0 drivers/usb/core/driver.c:396 really_probe+0x1fd/0xc60 drivers/base/dd.c:557 driver_probe_device+0x1ed/0x380 drivers/base/dd.c:743 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:431 __device_attach+0x1db/0x400 drivers/base/dd.c:917 bus_probe_device+0x19d/0x250 drivers/base/bus.c:491 device_add+0x9eb/0x1ad0 drivers/base/core.c:3242 usb_set_configuration+0x9fc/0x1750 drivers/usb/core/message.c:2164 usb_generic_driver_probe+0x74/0xa0 drivers/usb/core/generic.c:238 usb_probe_device+0x98/0x240 drivers/usb/core/driver.c:293 really_probe+0x1fd/0xc60 drivers/base/dd.c:557 driver_probe_device+0x1ed/0x380 drivers/base/dd.c:743 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:431 __device_attach+0x1db/0x400 drivers/base/dd.c:917 bus_probe_device+0x19d/0x250 drivers/base/bus.c:491 device_add+0x9eb/0x1ad0 drivers/base/core.c:3242 usb_new_device.cold+0x69a/0xee1 drivers/usb/core/hub.c:2555 hub_port_connect drivers/usb/core/hub.c:5223 [inline] hub_port_connect_change drivers/usb/core/hub.c:5363 [inline] port_event drivers/usb/core/hub.c:5509 [inline] hub_event+0x10a3/0x36b0 drivers/usb/core/hub.c:5591 process_one_work+0x84c/0x13b0 kernel/workqueue.c:2275 worker_thread+0x598/0xf80 kernel/workqueue.c:2421 kthread+0x36f/0x450 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task kworker/1:4:8640 blocked for more than 145 seconds. Not tainted 5.12.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:4 state:D stack:24840 pid: 8640 ppid: 2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:4322 [inline] __schedule+0x8d9/0x2160 kernel/sched/core.c:5073 schedule+0xcf/0x270 kernel/sched/core.c:5152 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5211 __mutex_lock_common kernel/locking/mutex.c:1026 [inline] __mutex_lock+0x81f/0x1120 kernel/locking/mutex.c:1096 hwrng_register+0x6b/0x500 drivers/char/hw_random/core.c:478 chaoskey_probe+0x7a6/0xb50 drivers/usb/misc/chaoskey.c:205 usb_probe_interface+0x274/0x6a0 drivers/usb/core/driver.c:396 really_probe+0x1fd/0xc60 drivers/base/dd.c:557 driver_probe_device+0x1ed/0x380 drivers/base/dd.c:743 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:431 __device_attach+0x1db/0x400 drivers/base/dd.c:917 bus_probe_device+0x19d/0x250 drivers/base/bus.c:491 device_add+0x9eb/0x1ad0 drivers/base/core.c:3242 usb_set_configuration+0x9fc/0x1750 drivers/usb/core/message.c:2164 usb_generic_driver_probe+0x74/0xa0 drivers/usb/core/generic.c:238 usb_probe_device+0x98/0x240 drivers/usb/core/driver.c:293 really_probe+0x1fd/0xc60 drivers/base/dd.c:557 driver_probe_device+0x1ed/0x380 drivers/base/dd.c:743 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:431 __device_attach+0x1db/0x400 drivers/base/dd.c:917 bus_probe_device+0x19d/0x250 drivers/base/bus.c:491 device_add+0x9eb/0x1ad0 drivers/base/core.c:3242 usb_new_device.cold+0x69a/0xee1 drivers/usb/core/hub.c:2555 hub_port_connect drivers/usb/core/hub.c:5223 [inline] hub_port_connect_change drivers/usb/core/hub.c:5363 [inline] port_event drivers/usb/core/hub.c:5509 [inline] hub_event+0x10a3/0x36b0 drivers/usb/core/hub.c:5591 process_one_work+0x84c/0x13b0 kernel/workqueue.c:2275 worker_thread+0x598/0xf80 kernel/workqueue.c:2421 kthread+0x36f/0x450 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task kworker/0:5:8642 blocked for more than 146 seconds. Not tainted 5.12.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:5 state:D stack:26040 pid: 8642 ppid: 2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:4322 [inline] __schedule+0x8d9/0x2160 kernel/sched/core.c:5073 schedule+0xcf/0x270 kernel/sched/core.c:5152 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5211 __mutex_lock_common kernel/locking/mutex.c:1026 [inline] __mutex_lock+0x81f/0x1120 kernel/locking/mutex.c:1096 hwrng_register+0x6b/0x500 drivers/char/hw_random/core.c:478 chaoskey_probe+0x7a6/0xb50 drivers/usb/misc/chaoskey.c:205 usb_probe_interface+0x274/0x6a0 drivers/usb/core/driver.c:396 really_probe+0x1fd/0xc60 drivers/base/dd.c:557 driver_probe_device+0x1ed/0x380 drivers/base/dd.c:743 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:431 __device_attach+0x1db/0x400 drivers/base/dd.c:917 bus_probe_device+0x19d/0x250 drivers/base/bus.c:491 device_add+0x9eb/0x1ad0 drivers/base/core.c:3242 usb_set_configuration+0x9fc/0x1750 drivers/usb/core/message.c:2164 usb_generic_driver_probe+0x74/0xa0 drivers/usb/core/generic.c:238 usb_probe_device+0x98/0x240 drivers/usb/core/driver.c:293 really_probe+0x1fd/0xc60 drivers/base/dd.c:557 driver_probe_device+0x1ed/0x380 drivers/base/dd.c:743 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:431 __device_attach+0x1db/0x400 drivers/base/dd.c:917 bus_probe_device+0x19d/0x250 drivers/base/bus.c:491 device_add+0x9eb/0x1ad0 drivers/base/core.c:3242 usb_new_device.cold+0x69a/0xee1 drivers/usb/core/hub.c:2555 hub_port_connect drivers/usb/core/hub.c:5223 [inline] hub_port_connect_change drivers/usb/core/hub.c:5363 [inline] port_event drivers/usb/core/hub.c:5509 [inline] hub_event+0x10a3/0x36b0 drivers/usb/core/hub.c:5591 process_one_work+0x84c/0x13b0 kernel/workqueue.c:2275 worker_thread+0x598/0xf80 kernel/workqueue.c:2421 kthread+0x36f/0x450 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Showing all locks held in the system: 6 locks held by kworker/0:1/7: #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x771/0x13b0 kernel/workqueue.c:2246 #1: ffffc90000cc7db0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x79e/0x13b0 kernel/workqueue.c:2250 #2: ffff8881447dc218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:740 [inline] #2: ffff8881447dc218 (&dev->mutex){....}-{3:3}, at: hub_event+0x127/0x36b0 drivers/usb/core/hub.c:5537 #3: ffff888019668218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:740 [inline] #3: ffff888019668218 (&dev->mutex){....}-{3:3}, at: __device_attach+0x74/0x400 drivers/base/dd.c:892 #4: ffff88803ccdc1a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:740 [inline] #4: ffff88803ccdc1a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x74/0x400 drivers/base/dd.c:892 #5: ffffffff8b325aa8 (rng_mutex){+.+.}-{3:3}, at: hwrng_register+0x6b/0x500 drivers/char/hw_random/core.c:478 6 locks held by kworker/1:1/35: #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x771/0x13b0 kernel/workqueue.c:2246 #1: ffffc90000e1fdb0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x79e/0x13b0 kernel/workqueue.c:2250 #2: ffff88814482c218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:740 [inline] #2: ffff88814482c218 (&dev->mutex){....}-{3:3}, at: hub_event+0x127/0x36b0 drivers/usb/core/hub.c:5537 #3: ffff88803f272218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:740 [inline] #3: ffff88803f272218 (&dev->mutex){....}-{3:3}, at: __device_attach+0x74/0x400 drivers/base/dd.c:892 #4: ffff88803d0fc1a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:740 [inline] #4: ffff88803d0fc1a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x74/0x400 drivers/base/dd.c:892 #5: ffffffff8b325aa8 (rng_mutex){+.+.}-{3:3}, at: hwrng_register+0x6b/0x500 drivers/char/hw_random/core.c:478 6 locks held by kworker/0:2/257: #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x771/0x13b0 kernel/workqueue.c:2246 #1: ffffc9000180fdb0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x79e/0x13b0 kernel/workqueue.c:2250 #2: ffff88814480c218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:740 [inline] #2: ffff88814480c218 (&dev->mutex){....}-{3:3}, at: hub_event+0x127/0x36b0 drivers/usb/core/hub.c:5537 #3: ffff8880226f7218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:740 [inline] #3: ffff8880226f7218 (&dev->mutex){....}-{3:3}, at: __device_attach+0x74/0x400 drivers/base/dd.c:892 #4: ffff88803d3731a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:740 [inline] #4: ffff88803d3731a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x74/0x400 drivers/base/dd.c:892 #5: ffffffff8b325aa8 (rng_mutex){+.+.}-{3:3}, at: hwrng_register+0x6b/0x500 drivers/char/hw_random/core.c:478 1 lock held by khungtaskd/1670: #0: ffffffff8a96a6c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6327 1 lock held by in:imklog/8117: #0: ffff88801fcf00f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x9c/0xb0 fs/file.c:961 6 locks held by kworker/1:3/8639: #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x771/0x13b0 kernel/workqueue.c:2246 #1: ffffc90001d1fdb0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x79e/0x13b0 kernel/workqueue.c:2250 #2: ffff8881447a4218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:740 [inline] #2: ffff8881447a4218 (&dev->mutex){....}-{3:3}, at: hub_event+0x127/0x36b0 drivers/usb/core/hub.c:5537 #3: ffff88803cd5d218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:740 [inline] #3: ffff88803cd5d218 (&dev->mutex){....}-{3:3}, at: __device_attach+0x74/0x400 drivers/base/dd.c:892 #4: ffff88803c5421a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:740 [inline] #4: ffff88803c5421a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x74/0x400 drivers/base/dd.c:892 #5: ffffffff8b325aa8 (rng_mutex){+.+.}-{3:3}, at: hwrng_register+0x6b/0x500 drivers/char/hw_random/core.c:478 6 locks held by kworker/1:4/8640: #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x771/0x13b0 kernel/workqueue.c:2246 #1: ffffc90001d4fdb0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x79e/0x13b0 kernel/workqueue.c:2250 #2: ffff8881447f4218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:740 [inline] #2: ffff8881447f4218 (&dev->mutex){....}-{3:3}, at: hub_event+0x127/0x36b0 drivers/usb/core/hub.c:5537 #3: ffff88803bb51218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:740 [inline] #3: ffff88803bb51218 (&dev->mutex){....}-{3:3}, at: __device_attach+0x74/0x400 drivers/base/dd.c:892 #4: ffff888016c001a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:740 [inline] #4: ffff888016c001a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x74/0x400 drivers/base/dd.c:892 #5: ffffffff8b325aa8 (rng_mutex){+.+.}-{3:3}, at: hwrng_register+0x6b/0x500 drivers/char/hw_random/core.c:478 6 locks held by kworker/0:5/8642: #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888013f1b538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x771/0x13b0 kernel/workqueue.c:2246 #1: ffffc90001e7fdb0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x79e/0x13b0 kernel/workqueue.c:2250 #2: ffff88814484c218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:740 [inline] #2: ffff88814484c218 (&dev->mutex){....}-{3:3}, at: hub_event+0x127/0x36b0 drivers/usb/core/hub.c:5537 #3: ffff88801249c218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:740 [inline] #3: ffff88801249c218 (&dev->mutex){....}-{3:3}, at: __device_attach+0x74/0x400 drivers/base/dd.c:892 #4: ffff88803d3721a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:740 [inline] #4: ffff88803d3721a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x74/0x400 drivers/base/dd.c:892 #5: ffffffff8b325aa8 (rng_mutex){+.+.}-{3:3}, at: hwrng_register+0x6b/0x500 drivers/char/hw_random/core.c:478 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1670 Comm: khungtaskd Not tainted 5.12.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x93/0xc2 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x30/0x99 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x11f/0x170 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0x956/0xc30 kernel/hung_task.c:294 kthread+0x36f/0x450 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 158 Comm: kworker/u4:3 Not tainted 5.12.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:lock_is_held_type+0xe/0x130 kernel/locking/lockdep.c:5538 Code: 88 48 c7 c7 20 e2 aa 88 89 44 24 04 e8 55 e5 c0 ff 0f 0b 8b 44 24 04 e9 08 ff ff ff 41 57 41 56 41 55 41 bd 01 00 00 00 41 54 <55> 53 48 83 ec 08 8b 0d b2 53 18 04 85 c9 0f 84 d0 00 00 00 65 8b RSP: 0018:ffffc9000121fb68 EFLAGS: 00000202 RAX: 0000000000000001 RBX: 1ffff92000243f76 RCX: ffffffff81513268 RDX: 1ffffffff152e59e RSI: 00000000ffffffff RDI: ffffffff8a96a600 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8c56f3cf R10: fffffbfff18ade79 R11: 0000000000000001 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3f08bad028 CR3: 0000000021b53000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_is_held include/linux/lockdep.h:278 [inline] rcu_read_lock_sched_held+0x3a/0x70 kernel/rcu/update.c:125 trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x5d4/0x730 kernel/locking/lockdep.c:5481 rcu_lock_acquire include/linux/rcupdate.h:267 [inline] rcu_read_lock include/linux/rcupdate.h:656 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:404 [inline] batadv_nc_worker+0x108/0xcc0 net/batman-adv/network-coding.c:715 process_one_work+0x84c/0x13b0 kernel/workqueue.c:2275 worker_thread+0x598/0xf80 kernel/workqueue.c:2421 kthread+0x36f/0x450 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294