hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 INFO: task kworker/u4:1:23 blocked for more than 140 seconds. hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 Not tainted 4.19.211-syzkaller #0 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 kworker/u4:1 D26048 23 2 0x80000000 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 Workqueue: events_unbound fsnotify_mark_destroy_workfn hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 Call Trace: hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 schedule_timeout+0x92d/0xfe0 kernel/time/timer.c:1794 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common+0x29c/0x470 kernel/sched/completion.c:115 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 __synchronize_srcu+0x124/0x210 kernel/rcu/srcutree.c:936 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 fsnotify_mark_destroy_workfn+0xfd/0x340 fs/notify/mark.c:795 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 process_scheduled_works kernel/workqueue.c:2212 [inline] worker_thread+0x82b/0x1130 kernel/workqueue.c:2298 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Showing all locks held in the system: 2 locks held by kworker/u4:1/23: #0: 0000000090cf671a ((wq_completion)"events_unbound"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000042315d7 ((reaper_work).work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 1 lock held by khungtaskd/1570: #0: 000000001b1d010e (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7806: #0: 00000000fd236d4a (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 3 locks held by kworker/0:4/9347: #0: 000000000f9be97f ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000ff2b5948 ((addr_chk_work).work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 #2: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4476 4 locks held by kworker/1:4/9349: 2 locks held by kworker/u4:8/11057: #0: 0000000090cf671a ((wq_completion)"events_unbound"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 0000000020db11c7 (connector_reaper_work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 1 lock held by syz-executor.3/30010: #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:759 [inline] #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3323 1 lock held by syz-executor.3/30026: #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:759 [inline] #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3323 1 lock held by syz-executor.3/30064: #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:759 [inline] #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3323 1 lock held by syz-executor.1/1164: #0: 00000000ec92b5a5 (rcu_preempt_state.exp_mutex){+.+.}, at: exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline] #0: 00000000ec92b5a5 (rcu_preempt_state.exp_mutex){+.+.}, at: _synchronize_rcu_expedited+0x256/0x6f0 kernel/rcu/tree_exp.h:667 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 2 locks held by syz-executor.1/11162: hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:759 [inline] #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3323 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 #1: 00000000ec92b5a5 (rcu_preempt_state.exp_mutex){+.+.}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline] #1: 00000000ec92b5a5 (rcu_preempt_state.exp_mutex){+.+.}, at: _synchronize_rcu_expedited+0x4dc/0x6f0 kernel/rcu/tree_exp.h:667 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 1 lock held by syz-executor.1/14220: hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:759 [inline] #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3323 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 1 lock held by syz-executor.1/14245: #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:759 [inline] #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3323 1 lock held by syz-executor.1/14304: #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:759 [inline] #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3323 1 lock held by syz-executor.0/22821: #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:759 [inline] #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3323 1 lock held by syz-executor.0/22861: #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:759 [inline] #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3323 1 lock held by syz-executor.0/22917: #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:759 [inline] #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3323 1 lock held by syz-executor.0/25316: #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:759 [inline] #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3323 1 lock held by syz-executor.0/25331: #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:759 [inline] #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3323 1 lock held by syz-executor.0/25368: #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:759 [inline] #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3323 1 lock held by syz-executor.3/27733: #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:759 [inline] #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3323 1 lock held by syz-executor.3/27753: #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:759 [inline] #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3323 1 lock held by syz-executor.3/27768: #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:759 [inline] #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3323 1 lock held by syz-executor.3/3381: #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: rtnl_lock net/core/rtnetlink.c:77 [inline] #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x3fe/0xb80 net/core/rtnetlink.c:4779 1 lock held by syz-executor.3/3385: #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: rtnl_lock net/core/rtnetlink.c:77 [inline] #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x3fe/0xb80 net/core/rtnetlink.c:4779 1 lock held by syz-executor.0/3507: #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: rtnl_lock net/core/rtnetlink.c:77 [inline] #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x3fe/0xb80 net/core/rtnetlink.c:4779 1 lock held by syz-executor.5/3519: #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: rtnl_lock net/core/rtnetlink.c:77 [inline] #0: 00000000cf4169a0 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x3fe/0xb80 net/core/rtnetlink.c:4779 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 kthread+0x33f/0x460 kernel/kthread.c:259 hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: hid-generic 0008:0004:0006.0066: unknown main item tag 0x0 NMI backtrace for cpu 1 CPU: 1 PID: 9349 Comm: kworker/1:4 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Workqueue: events uhid_device_add_worker RIP: 0010:__raw_callee_save___pv_queued_spin_unlock+0xc/0x12 Code: 56 57 41 50 41 51 41 52 41 53 e8 8f 14 00 00 41 5b 41 5a 41 59 41 58 5f 5e 5a 59 c3 66 90 52 b8 01 00 00 00 31 d2 f0 0f b0 17 <3c> 01 75 02 5a c3 56 0f b6 f0 e8 c5 ff ff ff 5e 5a c3 66 90 48 b8 RSP: 0018:ffff8880ba107c98 EFLAGS: 00000046 RAX: 0000000000000001 RBX: 0000000000000086 RCX: ffffffff814be140 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff8d420948 RBP: ffffffff8d420948 R08: 0000000000000000 R09: fffffbfff1a84129 R10: ffffffff8d42094b R11: 000000000000088a R12: ffffffff8d420950 R13: ffffffff8d420958 R14: 1ffff11017420f9e R15: ffffffff89f94720 FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa74400c520 CR3: 0000000091d8d000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:684 [inline] queued_spin_unlock arch/x86/include/asm/qspinlock.h:58 [inline] do_raw_spin_unlock+0x171/0x230 kernel/locking/spinlock_debug.c:135 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:159 [inline] _raw_spin_unlock_irqrestore+0x23/0xe0 kernel/locking/spinlock.c:184 debug_object_activate+0x295/0x450 lib/debugobjects.c:498 debug_hrtimer_activate kernel/time/hrtimer.c:416 [inline] debug_activate kernel/time/hrtimer.c:465 [inline] enqueue_hrtimer+0x27/0x3d0 kernel/time/hrtimer.c:972 __run_hrtimer kernel/time/hrtimer.c:1480 [inline] __hrtimer_run_queues+0xae6/0xe60 kernel/time/hrtimer.c:1527 hrtimer_interrupt+0x326/0x9e0 kernel/time/hrtimer.c:1585 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1071 [inline] smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1096 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1724 [inline] RIP: 0010:vprintk_emit+0x668/0x740 kernel/printk/printk.c:1964 Code: 48 b8 00 00 00 00 00 fc ff df 41 80 7c 05 00 00 0f 85 d9 00 00 00 48 83 3d 9c a2 a3 08 00 74 37 e8 7d a5 14 00 48 89 df 57 9d <0f> 1f 44 00 00 e9 82 fe ff ff e8 69 a5 14 00 0f 0b e8 62 a5 14 00 RSP: 0018:ffff888058bdf410 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff888058bd4680 RBX: 0000000000000293 RCX: 1ffff1100b17a9ea RDX: 0000000000000000 RSI: ffffffff814ddff3 RDI: 0000000000000293 RBP: ffff888058bdf450 R08: ffffffff8cd54568 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000003a R13: 1ffffffff13e3051 R14: 0000000000000200 R15: 0000000000000001 dev_vprintk_emit+0x2e3/0x640 drivers/base/core.c:3264 dev_printk_emit+0xbb/0xf0 drivers/base/core.c:3275 __dev_printk+0x108/0x260 drivers/base/core.c:3287 _dev_warn+0xd8/0x110 drivers/base/core.c:3331 hid_parser_main+0x65d/0xb60 drivers/hid/hid-core.c:629 hid_open_report+0x355/0x6e0 drivers/hid/hid-core.c:1089 hid_parse include/linux/hid.h:1032 [inline] hid_generic_probe+0x4a/0x90 drivers/hid/hid-generic.c:66 hid_device_probe+0x29e/0x3d0 drivers/hid/hid-core.c:2105 really_probe+0x622/0xbd0 drivers/base/dd.c:506 driver_probe_device+0x218/0x340 drivers/base/dd.c:667 __device_attach_driver+0x29e/0x370 drivers/base/dd.c:754 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:464 __device_attach+0x226/0x470 drivers/base/dd.c:822 bus_probe_device+0x1ea/0x2a0 drivers/base/bus.c:524 device_add+0xb37/0x16d0 drivers/base/core.c:2170 hid_add_device+0x344/0x9e0 drivers/hid/hid-core.c:2257 uhid_device_add_worker+0x3a/0x150 drivers/hid/uhid.c:65 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415