INFO: task syz-executor:4828 blocked for more than 144 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:4828 tgid:4828 ppid:1 task_flags:0x400140 flags:0x00800001 Call trace: __switch_to+0x2b0/0x6e0 arch/arm64/kernel/process.c:775 (T) context_switch kernel/sched/core.c:5510 [inline] __schedule+0x1370/0x2d80 kernel/sched/core.c:7234 __schedule_loop kernel/sched/core.c:7311 [inline] schedule+0x13c/0x20c kernel/sched/core.c:7326 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7383 __mutex_lock_common kernel/locking/mutex.c:726 [inline] __mutex_lock+0x4ec/0xf14 kernel/locking/mutex.c:821 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874 new_device_store+0x138/0x5c0 drivers/net/netdevsim/bus.c:184 bus_attr_store+0x80/0xa4 drivers/base/bus.c:172 sysfs_kf_write+0xe0/0x108 fs/sysfs/file.c:145 kernfs_fop_write_iter+0x260/0x3b8 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x51c/0xa0c fs/read_write.c:687 ksys_write+0x12c/0x228 fs/read_write.c:739 __do_sys_write fs/read_write.c:750 [inline] __se_sys_write fs/read_write.c:747 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:747 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:736 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 INFO: task syz-executor:4833 blocked for more than 144 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:4833 tgid:4833 ppid:1 task_flags:0x400140 flags:0x00800011 Call trace: __switch_to+0x2b0/0x6e0 arch/arm64/kernel/process.c:775 (T) context_switch kernel/sched/core.c:5510 [inline] __schedule+0x1370/0x2d80 kernel/sched/core.c:7234 __schedule_loop kernel/sched/core.c:7311 [inline] schedule+0x13c/0x20c kernel/sched/core.c:7326 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7383 __mutex_lock_common kernel/locking/mutex.c:726 [inline] __mutex_lock+0x4ec/0xf14 kernel/locking/mutex.c:821 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874 device_lock include/linux/device.h:1102 [inline] device_del+0xa4/0x71c drivers/base/core.c:3923 device_unregister+0x2c/0xf0 drivers/base/core.c:4002 nsim_bus_dev_del+0x60/0x8c drivers/net/netdevsim/bus.c:491 del_device_store+0x24c/0x2d4 drivers/net/netdevsim/bus.c:244 bus_attr_store+0x80/0xa4 drivers/base/bus.c:172 sysfs_kf_write+0xe0/0x108 fs/sysfs/file.c:145 kernfs_fop_write_iter+0x260/0x3b8 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x51c/0xa0c fs/read_write.c:687 ksys_write+0x12c/0x228 fs/read_write.c:739 __do_sys_write fs/read_write.c:750 [inline] __se_sys_write fs/read_write.c:747 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:747 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:736 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 INFO: task syz-executor:4836 blocked for more than 144 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:4836 tgid:4836 ppid:1 task_flags:0x400140 flags:0x00800001 Call trace: __switch_to+0x2b0/0x6e0 arch/arm64/kernel/process.c:775 (T) context_switch kernel/sched/core.c:5510 [inline] __schedule+0x1370/0x2d80 kernel/sched/core.c:7234 __schedule_loop kernel/sched/core.c:7311 [inline] schedule+0x13c/0x20c kernel/sched/core.c:7326 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7383 __mutex_lock_common kernel/locking/mutex.c:726 [inline] __mutex_lock+0x4ec/0xf14 kernel/locking/mutex.c:821 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874 del_device_store+0xd8/0x2d4 drivers/net/netdevsim/bus.c:234 bus_attr_store+0x80/0xa4 drivers/base/bus.c:172 sysfs_kf_write+0xe0/0x108 fs/sysfs/file.c:145 kernfs_fop_write_iter+0x260/0x3b8 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x51c/0xa0c fs/read_write.c:687 ksys_write+0x12c/0x228 fs/read_write.c:739 __do_sys_write fs/read_write.c:750 [inline] __se_sys_write fs/read_write.c:747 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:747 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:736 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 INFO: task syz-executor:4843 blocked for more than 144 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:4843 tgid:4843 ppid:4837 task_flags:0x400140 flags:0x00800000 Call trace: __switch_to+0x2b0/0x6e0 arch/arm64/kernel/process.c:775 (T) context_switch kernel/sched/core.c:5510 [inline] __schedule+0x1370/0x2d80 kernel/sched/core.c:7234 __schedule_loop kernel/sched/core.c:7311 [inline] schedule+0x13c/0x20c kernel/sched/core.c:7326 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7383 __mutex_lock_common kernel/locking/mutex.c:726 [inline] __mutex_lock+0x4ec/0xf14 kernel/locking/mutex.c:821 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874 new_device_store+0x138/0x5c0 drivers/net/netdevsim/bus.c:184 bus_attr_store+0x80/0xa4 drivers/base/bus.c:172 sysfs_kf_write+0xe0/0x108 fs/sysfs/file.c:145 kernfs_fop_write_iter+0x260/0x3b8 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x51c/0xa0c fs/read_write.c:687 ksys_write+0x12c/0x228 fs/read_write.c:739 __do_sys_write fs/read_write.c:750 [inline] __se_sys_write fs/read_write.c:747 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:747 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:736 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 Showing all locks held in the system: 2 locks held by kworker/u8:0/12: 9 locks held by kworker/u8:1/15: 1 lock held by khungtaskd/31: #0: ffff800088cb6f20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] #0: ffff800088cb6f20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline] #0: ffff800088cb6f20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x4c/0x188 kernel/locking/lockdep.c:6775 3 locks held by kworker/u8:2/39: 5 locks held by pr/ttyAMA-1/41: 4 locks held by kworker/0:2/1080: 1 lock held by klogd/4331: 2 locks held by udevd/4342: 1 lock held by dhcpcd/4397: 2 locks held by getty/4489: #0: ffff0000ce9fe0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80009248b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x348/0xf78 drivers/tty/n_tty.c:2211 1 lock held by syz-executor/4720: 3 locks held by udevd/4735: 4 locks held by syz-executor/4828: #0: ffff0000cf9f0450 (sb_writers#6){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2728 [inline] #0: ffff0000cf9f0450 (sb_writers#6){.+.+}-{0:0}, at: vfs_write+0x248/0xa0c fs/read_write.c:683 #1: ffff0000df30a080 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1b0/0x3b8 fs/kernfs/file.c:336 #2: ffff0000c9b8a698 (kn->active#56){.+.+}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:73 [inline] #2: ffff0000c9b8a698 (kn->active#56){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1f0/0x3b8 fs/kernfs/file.c:337 #3: ffff800089583b80 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: new_device_store+0x138/0x5c0 drivers/net/netdevsim/bus.c:184 5 locks held by syz-executor/4833: #0: ffff0000cf9f0450 (sb_writers#6){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2728 [inline] #0: ffff0000cf9f0450 (sb_writers#6){.+.+}-{0:0}, at: vfs_write+0x248/0xa0c fs/read_write.c:683 #1: ffff0000df18e480 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1b0/0x3b8 fs/kernfs/file.c:336 #2: ffff0000c9b8a5a8 (kn->active#55){.+.+}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:73 [inline] #2: ffff0000c9b8a5a8 (kn->active#55){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1f0/0x3b8 fs/kernfs/file.c:337 #3: ffff800089583b80 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd8/0x2d4 drivers/net/netdevsim/bus.c:234 #4: ffff0000c5c8a128 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1102 [inline] #4: ffff0000c5c8a128 (&dev->mutex){....}-{4:4}, at: device_del+0xa4/0x71c drivers/base/core.c:3923 3 locks held by kworker/u9:3/4834: #0: ffff0000d92de940 ((wq_completion)hci3){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #0: ffff0000d92de940 ((wq_completion)hci3){+.+.}-{0:0}, at: process_scheduled_works+0x734/0x10b8 kernel/workqueue.c:3405 #1: ffff80009be47c40 ((work_completion)(&hdev->power_on)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #1: ffff80009be47c40 ((work_completion)(&hdev->power_on)){+.+.}-{0:0}, at: process_scheduled_works+0x73c/0x10b8 kernel/workqueue.c:3405 #2: ffff0000fae48ea0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_do_open+0x2c/0xbc net/bluetooth/hci_core.c:426 4 locks held by syz-executor/4836: #0: ffff0000cf9f0450 (sb_writers#6){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2728 [inline] #0: ffff0000cf9f0450 (sb_writers#6){.+.+}-{0:0}, at: vfs_write+0x248/0xa0c fs/read_write.c:683 #1: ffff0000e0cc7880 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1b0/0x3b8 fs/kernfs/file.c:336 #2: ffff0000c9b8a5a8 (kn->active#55){.+.+}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:73 [inline] #2: ffff0000c9b8a5a8 (kn->active#55){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1f0/0x3b8 fs/kernfs/file.c:337 #3: ffff800089583b80 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd8/0x2d4 drivers/net/netdevsim/bus.c:234 4 locks held by syz-executor/4843: #0: ffff0000cf9f0450 (sb_writers#6){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2728 [inline] #0: ffff0000cf9f0450 (sb_writers#6){.+.+}-{0:0}, at: vfs_write+0x248/0xa0c fs/read_write.c:683 #1: ffff0000df30a480 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1b0/0x3b8 fs/kernfs/file.c:336 #2: ffff0000c9b8a698 (kn->active#56){.+.+}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:73 [inline] #2: ffff0000c9b8a698 (kn->active#56){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1f0/0x3b8 fs/kernfs/file.c:337 #3: ffff800089583b80 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: new_device_store+0x138/0x5c0 drivers/net/netdevsim/bus.c:184 3 locks held by kworker/0:5/4935: #0: ffff0000c002b540 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #0: ffff0000c002b540 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x734/0x10b8 kernel/workqueue.c:3405 #1: ffff800097667c40 (reg_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #1: ffff800097667c40 (reg_work){+.+.}-{0:0}, at: process_scheduled_works+0x73c/0x10b8 kernel/workqueue.c:3405 #2: ffff800089d92940 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 3 locks held by kworker/u8:8/4965: 2 locks held by kworker/u8:9/4966: 3 locks held by kworker/u8:10/4967: 3 locks held by kworker/u8:13/4972: #0: ffff0000ce275140 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #0: ffff0000ce275140 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x734/0x10b8 kernel/workqueue.c:3405 #1: ffff800095277c40 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #1: ffff800095277c40 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x73c/0x10b8 kernel/workqueue.c:3405 #2: ffff800089d92940 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 1 lock held by syz-executor/4974: 2 locks held by syz-executor/4977: =============================================