INFO: task syz-executor.1:11496 blocked for more than 143 seconds. Not tainted 6.0.0-rc6-syzkaller-17727-gaa49f95768a9 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack: 0 pid:11496 ppid: 1 flags:0x00000001 Call trace: __switch_to+0x180/0x298 arch/arm64/kernel/process.c:557 context_switch kernel/sched/core.c:5182 [inline] __schedule+0x414/0x5a0 kernel/sched/core.c:6494 schedule+0x64/0xa4 kernel/sched/core.c:6570 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6629 __mutex_lock_common+0x788/0xca8 kernel/locking/mutex.c:679 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 del_device_store+0x84/0x1c4 drivers/net/netdevsim/bus.c:205 bus_attr_store+0x44/0x64 drivers/base/bus.c:122 sysfs_kf_write+0xf4/0x11c fs/sysfs/file.c:136 kernfs_fop_write_iter+0x1e4/0x294 fs/kernfs/file.c:354 call_write_iter include/linux/fs.h:2187 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x2dc/0x46c fs/read_write.c:578 ksys_write+0xb4/0x160 fs/read_write.c:631 __do_sys_write fs/read_write.c:643 [inline] __se_sys_write fs/read_write.c:640 [inline] __arm64_sys_write+0x24/0x34 fs/read_write.c:640 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x18c/0x190 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/10: #0: ffff80000d443568 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x3c/0x450 kernel/rcu/tasks.h:507 1 lock held by rcu_tasks_trace/11: #0: ffff80000d443bb8 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x3c/0x450 kernel/rcu/tasks.h:507 1 lock held by ksoftirqd/0/13: 1 lock held by khungtaskd/26: #0: ffff80000d443440 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:279 2 locks held by getty/2709: #0: ffff0000c8da8098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x28/0x58 drivers/tty/tty_ldisc.c:244 #1: ffff80000f61e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x19c/0x89c drivers/tty/n_tty.c:2177 4 locks held by kworker/u4:4/3104: #0: ffff0000c0190938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x270/0x504 kernel/workqueue.c:2262 #1: ffff800013743d80 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x29c/0x504 kernel/workqueue.c:2264 #2: ffff80000d7f8a98 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x68/0x648 net/core/net_namespace.c:557 #3: ffff80000d4448c0 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x48/0x3a8 kernel/rcu/tree.c:3788 3 locks held by kworker/1:7/3170: #0: ffff0000c0010738 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x270/0x504 kernel/workqueue.c:2262 #1: ffff800013c4bd80 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x29c/0x504 kernel/workqueue.c:2264 #2: ffff80000d7faa28 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:74 6 locks held by syz-executor.1/11192: #0: ffff0000c516e460 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x180/0x46c fs/read_write.c:574 #1: ffff0000f4b0f088 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x12c/0x294 fs/kernfs/file.c:345 #2: ffff0000c3d88158 (kn->active#178){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x134/0x294 fs/kernfs/file.c:346 #3: ffff80000d6d4180 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0x84/0x1c4 drivers/net/netdevsim/bus.c:205 #4: ffff0000fc3900e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:835 [inline] #4: ffff0000fc3900e8 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1073 [inline] #4: ffff0000fc3900e8 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0x74/0x3a8 drivers/base/dd.c:1272 #5: ffff0000fc390af8 (&devlink->lock_key#2){+.+.}-{3:3}, at: devl_lock+0x24/0x34 net/core/devlink.c:275 4 locks held by syz-executor.1/11496: #0: ffff0000c516e460 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x180/0x46c fs/read_write.c:574 #1: ffff0000f3cf6e88 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x12c/0x294 fs/kernfs/file.c:345 #2: ffff0000c3d88158 (kn->active#178){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x134/0x294 fs/kernfs/file.c:346 #3: ffff80000d6d4180 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0x84/0x1c4 drivers/net/netdevsim/bus.c:205 4 locks held by syz-executor.1/11670: #0: ffff0000c516e460 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x180/0x46c fs/read_write.c:574 #1: ffff000159aec288 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x12c/0x294 fs/kernfs/file.c:345 #2: ffff0000c3d88158 (kn->active#178){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x134/0x294 fs/kernfs/file.c:346 #3: ffff80000d6d4180 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0x84/0x1c4 drivers/net/netdevsim/bus.c:205 1 lock held by syz-executor.1/11848: #0: ffff80000d7faa28 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline] #0: ffff80000d7faa28 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x458/0x82c net/core/rtnetlink.c:6087 =============================================