INFO: task kworker/0:14:11960 blocked for more than 143 seconds. Not tainted 6.2.0-rc5-syzkaller-00020-g7bf70dbb1882 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:14 state:D stack:20760 pid:11960 ppid:2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:5293 [inline] __schedule+0x9d1/0xe40 kernel/sched/core.c:6606 schedule+0xcb/0x190 kernel/sched/core.c:6682 usb_kill_urb+0x1d5/0x310 drivers/usb/core/urb.c:728 usb_start_wait_urb+0x1af/0x510 drivers/usb/core/message.c:64 usb_internal_control_msg drivers/usb/core/message.c:102 [inline] usb_control_msg+0x2a5/0x4b0 drivers/usb/core/message.c:153 hub_port_init+0xb59/0x25c0 drivers/usb/core/hub.c:4875 hub_port_connect+0xd69/0x24f0 drivers/usb/core/hub.c:5337 hub_port_connect_change+0x619/0xbe0 drivers/usb/core/hub.c:5552 port_event+0xecf/0x13b0 drivers/usb/core/hub.c:5712 hub_event+0x5c1/0xd80 drivers/usb/core/hub.c:5794 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8d523a50 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x30/0xd00 kernel/rcu/tasks.h:507 1 lock held by rcu_tasks_trace/13: #0: ffffffff8d524250 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x30/0xd00 kernel/rcu/tasks.h:507 1 lock held by khungtaskd/28: #0: ffffffff8d523880 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 2 locks held by getty/4739: #0: ffff88814a245098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244 #1: ffffc900015802f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6e8/0x1e50 drivers/tty/n_tty.c:2177 5 locks held by kworker/0:14/11960: #0: ffff888018200d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x796/0xd10 kernel/workqueue.c:2262 #1: ffffc90004fffd00 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x7d0/0xd10 kernel/workqueue.c:2264 #2: ffff888147354190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:831 [inline] #2: ffff888147354190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1bb/0xd80 drivers/usb/core/hub.c:5740 #3: ffff8881473574f8 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3148 [inline] #3: ffff8881473574f8 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect+0x6d5/0x24f0 drivers/usb/core/hub.c:5304 #4: ffff888021f48d68 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_connect+0x705/0x24f0 drivers/usb/core/hub.c:5305 2 locks held by kworker/u4:9/20656: 2 locks held by kworker/0:13/21118: #0: ffff888012872538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x796/0xd10 kernel/workqueue.c:2262 #1: ffffc90005ed7d00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0xd10 kernel/workqueue.c:2264 1 lock held by syz-executor.4/21651: #0: ffffffff8d528eb8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:292 [inline] #0: ffffffff8d528eb8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3a6/0x890 kernel/rcu/tree_exp.h:946 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.2.0-rc5-syzkaller-00020-g7bf70dbb1882 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x4e3/0x560 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x19b/0x3e0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline] watchdog+0xcd5/0xd20 kernel/hung_task.c:377 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 21651 Comm: syz-executor.4 Not tainted 6.2.0-rc5-syzkaller-00020-g7bf70dbb1882 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 RIP: 0010:lookup_chain_cache kernel/locking/lockdep.c:3724 [inline] RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:3744 [inline] RIP: 0010:validate_chain+0x17e/0x6470 kernel/locking/lockdep.c:3799 Code: 48 b8 eb 83 b5 80 46 86 c8 61 49 0f af c6 48 c1 e8 2f 48 8d 1c c5 00 31 83 90 48 89 d8 48 c1 e8 03 48 89 04 24 42 80 3c 20 00 <74> 08 48 89 df e8 48 3b 77 00 48 89 5c 24 30 48 8b 1b 48 85 db 74 RSP: 0018:ffffc9001595ec80 EFLAGS: 00000046 RAX: 1ffffffff211dfcf RBX: ffffffff908efe78 RCX: ffffffff816d5046 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff909731c0 RBP: ffffc9001595ef98 R08: dffffc0000000000 R09: fffffbfff212e639 R10: fffffbfff212e639 R11: 1ffffffff212e638 R12: dffffc0000000000 R13: ffff888089b757c0 R14: 161055a1c3c875d1 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000002b295000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __lock_acquire+0x1292/0x1f60 kernel/locking/lockdep.c:5055 lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5668 folio_memcg_lock+0x22e/0x5f0 mm/memcontrol.c:2114 page_remove_rmap+0xe9/0xfc0 mm/rmap.c:1397 zap_pte_range+0xa45/0x1c40 mm/memory.c:1405 zap_pmd_range+0x520/0x760 mm/memory.c:1529 zap_pud_range mm/memory.c:1558 [inline] zap_p4d_range mm/memory.c:1579 [inline] unmap_page_range+0x466/0x7a0 mm/memory.c:1600 unmap_vmas+0x3c9/0x560 mm/memory.c:1685 exit_mmap+0x243/0x670 mm/mmap.c:3089 __mmput+0x114/0x3b0 kernel/fork.c:1207 exit_mm+0x20f/0x2f0 kernel/exit.c:563 do_exit+0x5c7/0x2150 kernel/exit.c:854 do_group_exit+0x1fd/0x2b0 kernel/exit.c:1012 get_signal+0x1755/0x1820 kernel/signal.c:2859 arch_do_signal_or_restart+0x8d/0x5f0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop+0x74/0x160 kernel/entry/common.c:168 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x2e/0x60 kernel/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7efd9048c0c9 Code: Unable to access opcode bytes at 0x7efd9048c09f. RSP: 002b:00007efd9122e218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 00007efd905abf88 RCX: 00007efd9048c0c9 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007efd905abf8c RBP: 00007efd905abf80 R08: 0000000000000010 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 00007efd905abf8c R13: 00007ffdbc80495f R14: 00007efd9122e300 R15: 0000000000022000