rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (1 GPs behind) idle=1ae/1/0x4000000000000004 softirq=42509/42510 fqs=5237 (t=10500 jiffies g=47581 q=251241) NMI backtrace for cpu 1 CPU: 1 PID: 15241 Comm: syz-executor.0 Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1e9/0x30e lib/dump_stack.c:118 nmi_cpu_backtrace+0x9f/0x180 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x199/0x2a0 kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:475 [inline] check_cpu_stall kernel/rcu/tree_stall.h:549 [inline] rcu_pending kernel/rcu/tree.c:3225 [inline] rcu_sched_clock_irq+0x186a/0x1ac0 kernel/rcu/tree.c:2296 update_process_times+0x12c/0x180 kernel/time/timer.c:1727 tick_sched_handle kernel/time/tick-sched.c:176 [inline] tick_sched_timer+0x254/0x410 kernel/time/tick-sched.c:1320 __run_hrtimer kernel/time/hrtimer.c:1520 [inline] __hrtimer_run_queues+0x42d/0x930 kernel/time/hrtimer.c:1584 hrtimer_interrupt+0x373/0xd60 kernel/time/hrtimer.c:1646 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1113 [inline] smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1138 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:759 [inline] RIP: 0010:lock_acquire+0x1c7/0x480 kernel/locking/lockdep.c:4937 Code: c1 e8 03 80 3c 10 00 74 0c 48 c7 c7 70 b9 2b 89 e8 5e c0 58 00 48 83 3d 86 39 d3 07 00 0f 84 8e 02 00 00 48 8b 7c 24 20 57 9d <0f> 1f 44 00 00 65 48 8b 04 25 28 00 00 00 48 3b 44 24 58 0f 85 70 RSP: 0018:ffffc90000da8c40 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff125772e RBX: 1ffff1100abed518 RCX: ffffffff815969a4 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000286 RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff1628eae R10: fffffbfff1628eae R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffff888055f6a8c4 R15: ffffc90005808478 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:353 [inline] inet_twsk_kill+0x314/0x5a0 net/ipv4/inet_timewait_sock.c:58 call_timer_fn+0x91/0x160 kernel/time/timer.c:1405 expire_timers kernel/time/timer.c:1450 [inline] __run_timers+0x776/0x970 kernel/time/timer.c:1774 run_timer_softirq+0x46/0x80 kernel/time/timer.c:1787 __do_softirq+0x268/0x80c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x223/0x230 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:546 [inline] smp_apic_timer_interrupt+0x113/0x280 arch/x86/kernel/apic/apic.c:1140 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:759 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xa5/0xd0 kernel/locking/spinlock.c:191 Code: b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 0c 48 c7 c7 70 b9 2b 89 e8 ba f3 a6 f9 48 83 3d e2 6c 21 01 00 74 2c 4c 89 f7 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 cc 48 45 f9 65 8b 05 a1 d1 f7 77 RSP: 0018:ffffc90015c9f930 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff125772e RBX: ffffffff8b7a0620 RCX: dffffc0000000000 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000286 RBP: 1ffff11012be5cea R08: ffffffff8178fce0 R09: fffffbfff16f40c5 R10: fffffbfff16f40c5 R11: 0000000000000000 R12: ffff888093d79000 R13: 000000000000000b R14: 0000000000000286 R15: 0000000000000001 __debug_check_no_obj_freed lib/debugobjects.c:977 [inline] debug_check_no_obj_freed+0x592/0x640 lib/debugobjects.c:998 free_pages_prepare mm/page_alloc.c:1220 [inline] free_pcp_prepare+0x1ff/0x4b0 mm/page_alloc.c:1250 free_unref_page_prepare mm/page_alloc.c:3059 [inline] free_unref_page+0x12/0x230 mm/page_alloc.c:3108 __vunmap+0x8e6/0xa20 mm/vmalloc.c:2315 kcov_put kernel/kcov.c:396 [inline] kcov_close+0x27/0x50 kernel/kcov.c:495 __fput+0x2ed/0x750 fs/file_table.c:280 task_work_run+0x147/0x1d0 kernel/task_work.c:123 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x5ef/0x1f80 kernel/exit.c:795 do_group_exit+0x15e/0x2c0 kernel/exit.c:893 get_signal+0x13cf/0x1d60 kernel/signal.c:2739 do_signal+0x33/0x610 arch/x86/kernel/signal.c:784 exit_to_usermode_loop arch/x86/entry/common.c:161 [inline] prepare_exit_to_usermode+0x32a/0x600 arch/x86/entry/common.c:196 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c889 Code: 60 48 85 c9 74 1a 8b 54 24 24 85 d2 74 12 8b 5c 24 68 0f b7 0c 59 81 e1 ff 7f 00 00 39 d1 75 30 48 8b 4c 24 28 48 8b 54 24 40 <48> 8b 4c ca 08 48 03 48 10 48 8b 84 24 88 00 00 00 48 89 08 c6 84 RSP: 002b:00007fee05f73c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: 0000000000000048 RBX: 00007fee05f746d4 RCX: 000000000045c889 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000007 RBP: 000000000076bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000009fe R14: 00000000004ccba4 R15: 000000000076bfac