INFO: task kworker/1:0:32273 blocked for more than 143 seconds. Not tainted 6.8.0-rc4-syzkaller-00005-gc664e16bb1ba #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:0 state:D stack:23408 pid:32273 tgid:32273 ppid:2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:5400 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0x149/0x260 kernel/sched/core.c:6817 usb_kill_urb+0x1c9/0x300 drivers/usb/core/urb.c:713 usb_start_wait_urb+0x1b0/0x520 drivers/usb/core/message.c:65 usb_internal_control_msg drivers/usb/core/message.c:103 [inline] usb_control_msg+0x2b1/0x4c0 drivers/usb/core/message.c:154 get_bMaxPacketSize0 drivers/usb/core/hub.c:4768 [inline] hub_port_init+0xc21/0x2620 drivers/usb/core/hub.c:4964 hub_port_connect drivers/usb/core/hub.c:5412 [inline] hub_port_connect_change drivers/usb/core/hub.c:5623 [inline] port_event drivers/usb/core/hub.c:5783 [inline] hub_event+0x2908/0x50f0 drivers/usb/core/hub.c:5865 process_one_work kernel/workqueue.c:2633 [inline] process_scheduled_works+0x913/0x1420 kernel/workqueue.c:2706 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2787 kthread+0x2ef/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242 Showing all locks held in the system: 1 lock held by khungtaskd/29: #0: ffffffff8e130ae0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline] #0: ffffffff8e130ae0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline] #0: ffffffff8e130ae0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614 2 locks held by getty/4822: #0: ffff88802f7810a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b4/0x1e10 drivers/tty/n_tty.c:2201 1 lock held by syz-executor.2/5110: 3 locks held by kworker/0:4/5149: #0: ffff88802aa71938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline] #0: ffff88802aa71938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706 #1: ffffc900048b7d20 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline] #1: ffffc900048b7d20 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706 #2: ffffffff8f374f48 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xd0/0x16f0 net/ipv6/addrconf.c:4129 3 locks held by kworker/u4:1/19343: 5 locks held by kworker/1:0/32273: #0: ffff88801b6fcd38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline] #0: ffff88801b6fcd38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706 #1: ffffc90013f87d20 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline] #1: ffffc90013f87d20 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706 #2: ffff8880242cc190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:990 [inline] #2: ffff8880242cc190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1fe/0x50f0 drivers/usb/core/hub.c:5811 #3: ffff8880242cf510 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3169 [inline] #3: ffff8880242cf510 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect drivers/usb/core/hub.c:5380 [inline] #3: ffff8880242cf510 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect_change drivers/usb/core/hub.c:5623 [inline] #3: ffff8880242cf510 (&port_dev->status_lock){+.+.}-{3:3}, at: port_event drivers/usb/core/hub.c:5783 [inline] #3: ffff8880242cf510 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_event+0x255f/0x50f0 drivers/usb/core/hub.c:5865 #4: ffff888022329d28 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_connect drivers/usb/core/hub.c:5381 [inline] #4: ffff888022329d28 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_connect_change drivers/usb/core/hub.c:5623 [inline] #4: ffff888022329d28 (hcd->address0_mutex){+.+.}-{3:3}, at: port_event drivers/usb/core/hub.c:5783 [inline] #4: ffff888022329d28 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_event+0x259d/0x50f0 drivers/usb/core/hub.c:5865 1 lock held by syz-executor.1/14259: 1 lock held by syz-executor.4/14258: 1 lock held by syz-executor.3/14281: #0: ffffffff8f374f48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f374f48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6612 1 lock held by syz-executor.0/14289: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.8.0-rc4-syzkaller-00005-gc664e16bb1ba #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xfaf/0xff0 kernel/hung_task.c:379 kthread+0x2ef/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 14258 Comm: syz-executor.4 Not tainted 6.8.0-rc4-syzkaller-00005-gc664e16bb1ba #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline] RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:72 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:104 [inline] RIP: 0010:lock_is_held_type+0x6d/0x190 kernel/locking/lockdep.c:5821 Code: 8b 2d e7 3d 9d 74 41 83 bd bc 0a 00 00 00 0f 85 da 00 00 00 41 89 f6 49 89 ff 48 c7 04 24 00 00 00 00 9c 8f 04 24 4c 8b 24 24 48 c7 c7 c0 c2 aa 8b e8 56 1b 00 00 65 ff 05 6f 09 9c 74 41 83 RSP: 0018:ffffc900000078d8 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 00000000ffffffff RCX: 0000000080010004 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffffffff8e130a60 RBP: ffffc900000079a8 R08: ffffffff8f855a6f R09: 1ffffffff1f0ab4d R10: dffffc0000000000 R11: fffffbfff1f0ab4e R12: 0000000000000046 R13: ffff8880a06c8000 R14: 00000000ffffffff R15: ffffffff8e130a60 FS: 0000555556229480(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000000a523e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_is_held include/linux/lockdep.h:231 [inline] rcu_read_lock_sched_held+0x8d/0x130 kernel/rcu/update.c:126 cpufreq_update_util+0x94/0x250 kernel/sched/sched.h:2990 cfs_rq_util_change kernel/sched/fair.c:4004 [inline] update_load_avg+0x10d8/0x19e0 kernel/sched/fair.c:4764 enqueue_entity+0x73/0x1930 kernel/sched/fair.c:5286 enqueue_task_fair+0x171/0x8e0 kernel/sched/fair.c:6731 enqueue_task+0x1a1/0x2f0 kernel/sched/core.c:2118 activate_task kernel/sched/core.c:2148 [inline] ttwu_do_activate+0x1d1/0x7e0 kernel/sched/core.c:3795 ttwu_queue kernel/sched/core.c:4048 [inline] try_to_wake_up+0x88a/0x1470 kernel/sched/core.c:4369 hrtimer_wakeup+0x62/0x80 kernel/time/hrtimer.c:1943 __run_hrtimer kernel/time/hrtimer.c:1689 [inline] __hrtimer_run_queues+0x594/0xd00 kernel/time/hrtimer.c:1753 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1815 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline] __sysvec_apic_timer_interrupt+0x107/0x3a0 arch/x86/kernel/apic/apic.c:1082 sysvec_apic_timer_interrupt+0x92/0xb0 arch/x86/kernel/apic/apic.c:1076 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:unwind_next_frame+0x101a/0x29e0 Code: fa 8d e8 79 14 53 00 83 fb 04 0f 84 e6 00 00 00 83 fb 03 0f 84 92 01 00 00 83 fb 02 0f 85 34 02 00 00 48 89 ac 24 80 00 00 00 <48> 8b 04 24 48 8d 58 08 49 89 de 49 c1 ee 03 43 80 3c 2e 00 74 08 RSP: 0018:ffffc9000a9b7468 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000002 RCX: ffff8880a06c8000 RDX: 0000000000000003 RSI: ffffffff8dfa0250 RDI: 0000000000000002 RBP: ffffffff9006f5e1 R08: 0000000000000005 R09: ffffffff81405d47 R10: 0000000000000003 R11: ffff8880a06c8000 R12: ffffffff9006f5e0 R13: dffffc0000000000 R14: ffffc9000a9b7590 R15: 1ffff92001536ea8 arch_stack_walk+0x150/0x1b0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x117/0x1d0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x4e/0x60 mm/kasan/generic.c:640 poison_slab_object+0xa6/0xe0 mm/kasan/common.c:241 __kasan_slab_free+0x34/0x70 mm/kasan/common.c:257 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kfree+0x14a/0x380 mm/slub.c:4409 security_task_free+0xa0/0xc0 security/security.c:2986 copy_process+0x2fc0/0x3fc0 kernel/fork.c:2767 kernel_clone+0x21d/0x8d0 kernel/fork.c:2902 __do_sys_clone3 kernel/fork.c:3203 [inline] __se_sys_clone3+0x2cb/0x350 kernel/fork.c:3187 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7fc6642a9b99 Code: ff ff eb d2 e8 f8 62 fd ff 0f 1f 84 00 00 00 00 00 b8 ea ff ff ff 48 85 ff 74 2c 48 85 d2 74 27 49 89 c8 b8 b3 01 00 00 0f 05 <48> 85 c0 7c 18 74 01 c3 31 ed 48 83 e4 f0 4c 89 c7 ff d2 48 89 c7 RSP: 002b:00007fc6644cf918 EFLAGS: 00000202 ORIG_RAX: 00000000000001b3 RAX: ffffffffffffffda RBX: 00007fc664252270 RCX: 00007fc6642a9b99 RDX: 00007fc664252270 RSI: 0000000000000058 RDI: 00007fc6644cf960 RBP: 00007fc6650666c0 R08: 00007fc6650666c0 R09: 00007fc6644cfa47 R10: 0000000000000008 R11: 0000000000000202 R12: ffffffffffffffb0 R13: 000000000000000b R14: 00007fc6644cf960 R15: 00007fc6644cfa48