input: syz1 as /devices/virtual/input/input11 INFO: rcu_sched detected stalls on CPUs/tasks: (detected by 0, t=10502 jiffies, g=2098, c=2097, q=4) All QSes seen, last rcu_sched kthread activity 10491 (4294978903-4294968412), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.2 R running task 27280 9192 7478 0x00000008 Call Trace: sched_show_task kernel/sched/core.c:5168 [inline] sched_show_task.cold+0x2e3/0x347 kernel/sched/core.c:5143 print_other_cpu_stall kernel/rcu/tree.c:1501 [inline] check_cpu_stall kernel/rcu/tree.c:1616 [inline] __rcu_pending kernel/rcu/tree.c:3390 [inline] rcu_pending kernel/rcu/tree.c:3452 [inline] rcu_check_callbacks.cold+0xd3f/0xdaa kernel/rcu/tree.c:2792 update_process_times+0x29/0x60 kernel/time/timer.c:1590 tick_sched_handle+0x7d/0x150 kernel/time/tick-sched.c:165 tick_sched_timer+0x3e/0x120 kernel/time/tick-sched.c:1223 __run_hrtimer kernel/time/hrtimer.c:1223 [inline] __hrtimer_run_queues+0x25c/0xbb0 kernel/time/hrtimer.c:1287 hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline] smp_apic_timer_interrupt+0x117/0x5e0 arch/x86/kernel/apic/apic.c:1100 apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:111 [inline] RIP: 0010:unwind_next_frame+0x530/0x17a0 arch/x86/kernel/unwind_orc.c:348 RSP: 0018:ffff8880aea071b8 EFLAGS: 00000a06 ORIG_RAX: ffffffffffffff10 RAX: 000000000004008f RBX: ffff8880aea07268 RCX: 000000000004008f RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffffff89660e28 RBP: 1ffff11015d40e3e R08: 0000000000000001 R09: ffff8880aea07760 R10: ffff8880aea0729d R11: 0000000000058071 R12: ffffffff85008ff5 R13: ffff8880aea072a0 R14: ffff8880aea072b0 R15: 0000000000000002 __save_stack_trace+0x6b/0xd0 arch/x86/kernel/stacktrace.c:44 save_stack+0x32/0xa0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:529 kmem_cache_alloc+0x127/0x770 mm/slab.c:3552 kmem_cache_zalloc include/linux/slab.h:651 [inline] fill_pool lib/debugobjects.c:110 [inline] __debug_object_init+0x5b7/0x830 lib/debugobjects.c:341 debug_object_init lib/debugobjects.c:393 [inline] debug_object_activate+0x274/0x450 lib/debugobjects.c:474 debug_rcu_head_queue kernel/rcu/rcu.h:152 [inline] __call_rcu.constprop.0+0x31/0x7e0 kernel/rcu/tree.c:3050 dst_release+0x56/0x80 net/core/dst.c:188 refdst_drop include/net/dst.h:286 [inline] skb_dst_drop include/net/dst.h:298 [inline] __dev_queue_xmit+0x17df/0x25c0 net/core/dev.c:3484 neigh_hh_output include/net/neighbour.h:490 [inline] neigh_output include/net/neighbour.h:498 [inline] ip6_finish_output2+0x1085/0x2150 net/ipv6/ip6_output.c:120 ip6_finish_output+0x4d9/0xaf0 net/ipv6/ip6_output.c:154 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip6_output+0x1c9/0x650 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:462 [inline] NF_HOOK include/linux/netfilter.h:250 [inline] ndisc_send_skb+0xb56/0x11e0 net/ipv6/ndisc.c:483 ndisc_send_rs+0x125/0x630 net/ipv6/ndisc.c:677 addrconf_rs_timer+0x289/0x5a0 net/ipv6/addrconf.c:3761 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1279 expire_timers kernel/time/timer.c:1318 [inline] __run_timers kernel/time/timer.c:1636 [inline] __run_timers kernel/time/timer.c:1604 [inline] run_timer_softirq+0x52a/0x1390 kernel/time/timer.c:1649 __do_softirq+0x254/0x9bf kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x15b/0x1a0 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1102 apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:lock_acquire+0x1ec/0x3f0 kernel/locking/lockdep.c:3997 RSP: 0018:ffff88804a037910 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff0fa2cd1 RBX: ffff888091f88280 RCX: 000000001a581783 RDX: dffffc0000000000 RSI: ffff888091f88b78 RDI: 0000000000000282 RBP: ffffffff887192b8 R08: 00000000000064df R09: ffffffff8a08df78 R10: ffff888091f88b78 R11: ffff888091f88280 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000002 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x2d/0x40 kernel/locking/spinlock.c:224 netlink_lock_table net/netlink/af_netlink.c:434 [inline] netlink_broadcast_filtered+0x71/0x9d0 net/netlink/af_netlink.c:1484 kobject_uevent_env+0x819/0xc50 lib/kobject_uevent.c:495 device_add+0xa02/0x1400 drivers/base/core.c:1916 cdev_device_add+0x97/0xe0 fs/char_dev.c:555 evdev_connect+0x388/0x480 drivers/input/evdev.c:1418 input_attach_handler+0x14c/0x1a0 drivers/input/input.c:1010 input_register_device.cold+0xbf/0x204 drivers/input/input.c:2167 uinput_create_device drivers/input/misc/uinput.c:324 [inline] uinput_ioctl_handler.isra.0+0xdab/0x1810 drivers/input/misc/uinput.c:839 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c849 RSP: 002b:00007f4499778c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f44997796d4 RCX: 000000000045c849 RDX: 0000000000000000 RSI: 0000000000005501 RDI: 0000000000000003 RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000005ba R14: 00000000004c85a6 R15: 000000000076bf0c rcu_sched kthread starved for 10491 jiffies! g2098 c2097 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1 rcu_sched R running task 29920 9 2 0x80000000 Call Trace: schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_timeout+0x43c/0xe40 kernel/time/timer.c:1746 rcu_gp_kthread+0xb8e/0x1ce0 kernel/rcu/tree.c:2255 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404