rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): ------------[ cut here ]------------ WARNING: CPU: 1 PID: 21000 at kernel/sched/core.c:3014 try_invoke_on_locked_down_task+0x18c/0x300 kernel/sched/core.c:3014 Modules linked in: CPU: 1 PID: 21000 Comm: syz-executor.1 Not tainted 5.10.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:try_invoke_on_locked_down_task+0x18c/0x300 kernel/sched/core.c:3014 Code: 00 00 00 0f 85 34 01 00 00 48 83 c4 70 44 89 f0 5b 5d 41 5c 41 5d 41 5e 41 5f c3 65 8b 05 68 74 b5 7e 85 c0 0f 85 15 ff ff ff <0f> 0b e9 0e ff ff ff 48 8d 74 24 30 48 89 ef 49 c7 c6 40 49 03 00 RSP: 0018:ffffc90000d90690 EFLAGS: 00010046 RAX: 0000000000000000 RBX: 1ffff920001b20d4 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff815cb060 RDI: ffff888011793480 RBP: ffff888011793480 R08: 0000000000000000 R09: ffffffff8b33f983 R10: fffffbfff1667f30 R11: 0000000000000001 R12: ffffffff815cb060 R13: ffffc90000d907b0 R14: ffffffff8b33fa40 R15: ffffffff8b33f980 FS: 00007f31aa5f8700(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2e321000 CR3: 0000000012250000 CR4: 0000000000350ee0 Call Trace: rcu_print_task_stall kernel/rcu/tree_stall.h:278 [inline] print_other_cpu_stall kernel/rcu/tree_stall.h:495 [inline] check_cpu_stall kernel/rcu/tree_stall.h:646 [inline] rcu_pending kernel/rcu/tree.c:3694 [inline] rcu_sched_clock_irq.cold+0xa44/0xee8 kernel/rcu/tree.c:2567 update_process_times+0x77/0xd0 kernel/time/timer.c:1709 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176 tick_sched_timer+0x1d1/0x2a0 kernel/time/tick-sched.c:1328 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x1ce/0xea0 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1097 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline] sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x25/0x50 kernel/locking/spinlock.c:191 Code: f8 5d c3 66 90 55 48 89 fd 48 83 c7 18 53 48 89 f3 48 8b 74 24 10 e8 fa 28 6e f8 48 89 ef e8 82 dd 6e f8 f6 c7 02 75 1a 53 9d 01 00 00 00 e8 91 49 63 f8 65 8b 05 ba f3 19 77 85 c0 74 0a 5b RSP: 0018:ffffc90000d90bc0 EFLAGS: 00000212 RAX: 000000000130a6c4 RBX: 0000000000000212 RCX: ffffffff8155a917 RDX: 0000000000000000 RSI: 0000000000000102 RDI: 0000000000000000 RBP: ffffffff8f0f1950 R08: 0000000000000001 R09: ffffffff8ebaf797 R10: fffffbfff1d75ef2 R11: 0000000000000001 R12: 0000000000000005 R13: 0000000000000005 R14: dead000000000100 R15: dffffc0000000000 __debug_check_no_obj_freed lib/debugobjects.c:997 [inline] debug_check_no_obj_freed+0x20c/0x420 lib/debugobjects.c:1018 slab_free_hook mm/slub.c:1536 [inline] slab_free_freelist_hook+0x107/0x150 mm/slub.c:1577 slab_free mm/slub.c:3142 [inline] kmem_cache_free+0x82/0x350 mm/slub.c:3158 inet_twsk_free+0x123/0x180 net/ipv4/inet_timewait_sock.c:73 inet_twsk_put+0x78/0xa0 net/ipv4/inet_timewait_sock.c:80 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1410 expire_timers kernel/time/timer.c:1455 [inline] __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1747 __run_timers kernel/time/timer.c:1728 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1760 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x132/0x200 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:plist_check_list lib/plist.c:46 [inline] RIP: 0010:plist_check_head+0x98/0x2d0 lib/plist.c:60 Code: 89 ef 49 be 00 00 00 00 00 fc ff df 48 89 ea e8 de fd ff ff 49 39 ed 75 20 e8 74 d0 9f fd 4c 89 e2 48 c1 ea 03 42 80 3c 32 00 <74> 5b 4c 89 e7 e8 be 4d e1 fd eb 51 48 89 dd e8 54 d0 9f fd 48 89 RSP: 0018:ffffc90001a3fa60 EFLAGS: 00000246 RAX: 000000000002361d RBX: ffffc90001dbfb70 RCX: ffffc9000b015000 RDX: 1ffff920001be439 RSI: ffffffff83d033fc RDI: ffffc900027efb80 RBP: ffffc900027efb78 R08: 0000000000000001 R09: ffff8880148d9a63 R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90000df21c8 R13: ffffc900027efb78 R14: dffffc0000000000 R15: 000000000119b000 plist_del+0x25/0x480 lib/plist.c:114 __unqueue_futex+0xc9/0x1b0 kernel/futex.c:1440 mark_wake_futex+0x10f/0x1a0 kernel/futex.c:1458 futex_wake+0x3b4/0x490 kernel/futex.c:1618 do_futex+0x322/0x1a60 kernel/futex.c:3770 __do_sys_futex+0x2a2/0x470 kernel/futex.c:3828 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e159 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f31aa5f7cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 000000000119bf88 RCX: 000000000045e159 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 000000000119bf8c RBP: 000000000119bf80 R08: 000000000000000e R09: 0000000000000000 R10: 0000000020ffc000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffcd0bc498f R14: 00007f31aa5f89c0 R15: 000000000119bf8c