INFO: task syz.1.36:6681 blocked for more than 143 seconds. Not tainted 6.12.0-rc1-syzkaller-g3eddb108abe3 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.36 state:D stack:0 pid:6681 tgid:6674 ppid:6417 flags:0x00000001 Call trace: __switch_to+0x420/0x6dc arch/arm64/kernel/process.c:603 context_switch kernel/sched/core.c:5315 [inline] __schedule+0x14bc/0x2718 kernel/sched/core.c:6675 __schedule_loop kernel/sched/core.c:6752 [inline] schedule+0xbc/0x238 kernel/sched/core.c:6767 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6824 __mutex_lock_common+0xbd8/0x21a0 kernel/locking/mutex.c:684 __mutex_lock kernel/locking/mutex.c:752 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804 fdget_pos+0x214/0x2a0 fs/file.c:1187 ksys_read+0x8c/0x26c fs/read_write.c:703 __do_sys_read fs/read_write.c:722 [inline] __se_sys_read fs/read_write.c:720 [inline] __arm64_sys_read+0x7c/0x90 fs/read_write.c:720 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Showing all locks held in the system: 5 locks held by kworker/1:0/25: #0: ffff0000c2975948 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x628/0x1600 kernel/workqueue.c:3203 #1: ffff800097987c20 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x6bc/0x1600 kernel/workqueue.c:3203 #2: ffff0000cdf42190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline] #2: ffff0000cdf42190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1bc/0x4280 drivers/usb/core/hub.c:5849 #3: ffff0000cd963190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline] #3: ffff0000cd963190 (&dev->mutex){....}-{3:3}, at: usb_disconnect+0xec/0x808 drivers/usb/core/hub.c:2295 #4: ffff0000c2ce9160 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline] #4: ffff0000c2ce9160 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1095 [inline] #4: ffff0000c2ce9160 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xbc/0x698 drivers/base/dd.c:1293 1 lock held by khungtaskd/31: #0: ffff80008f9bf5e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:336 2 locks held by kworker/u8:8/4342: #0: ffff0000c0031148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x628/0x1600 kernel/workqueue.c:3203 #1: ffff8000a0587c20 ((reaper_work).work){+.+.}-{0:0}, at: process_one_work+0x6bc/0x1600 kernel/workqueue.c:3203 2 locks held by getty/6173: #0: ffff0000d71e90a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80009b7eb2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41c/0x1228 drivers/tty/n_tty.c:2211 3 locks held by kworker/u9:3/6421: #0: ffff0000d79d2948 ((wq_completion)hci3){+.+.}-{0:0}, at: process_one_work+0x628/0x1600 kernel/workqueue.c:3203 #1: ffff8000ae997c20 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work+0x6bc/0x1600 kernel/workqueue.c:3203 #2: ffff0000c7cc0d80 (&hdev->req_lock){+.+.}-{3:3}, at: hci_cmd_sync_work+0x194/0x34c net/bluetooth/hci_sync.c:327 3 locks held by kworker/1:3/6470: #0: ffff0000c0028948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x628/0x1600 kernel/workqueue.c:3203 #1: ffff8000afaf7c20 ((work_completion)(&fw_work->work)){+.+.}-{0:0}, at: process_one_work+0x6bc/0x1600 kernel/workqueue.c:3203 #2: ffff80008f86a8d0 (umhelper_sem){++++}-{3:3}, at: usermodehelper_read_lock_wait+0x138/0x244 kernel/umh.c:247 1 lock held by syz.1.36/6675: 4 locks held by syz.1.36/6678: 1 lock held by syz.1.36/6681: #0: ffff0000c99069b8 (&f->f_pos_lock){+.+.}-{3:3}, at: fdget_pos+0x214/0x2a0 fs/file.c:1187 1 lock held by syz.1.36/6689: 2 locks held by syz-executor/8187: #0: ffff0000f8db40e0 (&type->s_umount_key#55){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff0000f8db40e0 (&type->s_umount_key#55){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff0000f8db40e0 (&type->s_umount_key#55){+.+.}-{3:3}, at: deactivate_super+0xd8/0x100 fs/super.c:505 #1: ffff80008f9c4a00 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x58/0x534 kernel/rcu/tree.c:4561 2 locks held by syz.4.585/9242: #0: ffff0000f0d96b78 (&f->f_pos_lock){+.+.}-{3:3}, at: fdget_pos+0x214/0x2a0 fs/file.c:1187 #1: ffff0000d97f8420 (sb_writers#17){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2931 [inline] #1: ffff0000d97f8420 (sb_writers#17){.+.+}-{0:0}, at: vfs_write+0x354/0xcf4 fs/read_write.c:679 1 lock held by syz.1.591/9282: 1 lock held by syz.3.593/9283: #0: ffff0000d3a73988 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:122 [inline] #0: ffff0000d3a73988 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x154/0x38c mm/util.c:586 1 lock held by syz.3.593/9284: =============================================