rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (10499 ticks this GP) idle=89e/1/0x4000000000000004 softirq=127058/127058 fqs=1 (t=10500 jiffies g=208157 q=297) NMI backtrace for cpu 1 CPU: 1 PID: 18271 Comm: syz-executor.3 Not tainted 5.5.0-rc5-next-20200107-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+0x197/0x210 lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x1a2/0x1ef 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:3095 [inline] rcu_sched_clock_irq.cold+0x570/0xccb kernel/rcu/tree.c:2295 update_process_times+0x2d/0x70 kernel/time/timer.c:1726 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1310 __run_hrtimer kernel/time/hrtimer.c:1517 [inline] __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1641 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:preempt_count_sub+0x19/0x150 kernel/sched/core.c:3811 Code: 8b 4d d0 e9 3a fe ff ff 66 0f 1f 84 00 00 00 00 00 48 c7 c0 e0 64 87 8b 55 48 ba 00 00 00 00 00 fc ff df 48 89 c1 48 89 e5 53 <83> e0 07 48 c1 e9 03 83 c0 03 89 fb 0f b6 14 11 38 d0 7c 08 84 d2 RSP: 0018:ffffc90000d98db8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: ffffffff8b8764e0 RBX: ffffffff864af320 RCX: ffffffff8b8764e0 RDX: dffffc0000000000 RSI: ffff888032f829c8 RDI: 0000000000000001 RBP: ffffc90000d98dc0 R08: 1ffffffff16a119e R09: fffffbfff16a119f R10: fffffbfff16a119e R11: ffffffff8b508cf7 R12: ffff8880ae927400 R13: ffff8880a2685818 R14: ffff8880ae927400 R15: dffffc0000000000 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] _raw_spin_unlock_irq+0x59/0x80 kernel/locking/spinlock.c:199 expire_timers kernel/time/timer.c:1448 [inline] __run_timers kernel/time/timer.c:1773 [inline] __run_timers kernel/time/timer.c:1740 [inline] run_timer_softirq+0x6b1/0x1790 kernel/time/timer.c:1786 __do_softirq+0x262/0x98c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline] RIP: 0010:lock_acquire+0x20b/0x410 kernel/locking/lockdep.c:4487 Code: 9c 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 d3 01 00 00 48 83 3d a9 b0 58 08 00 0f 84 53 01 00 00 48 8b 7d c8 57 9d <0f> 1f 44 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 65 8b RSP: 0018:ffffc90006737648 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13675e3 RBX: ffff888032f82100 RCX: ffffffff815aa380 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000286 RBP: ffffc90006737690 R08: 1ffffffff16a119c R09: fffffbfff16a119d R10: ffff888032f829c8 R11: ffff888032f82100 R12: ffffffff89bae280 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002 rcu_lock_acquire include/linux/rcupdate.h:208 [inline] rcu_read_lock include/linux/rcupdate.h:601 [inline] lock_page_memcg+0x39/0x240 mm/memcontrol.c:1972 page_remove_file_rmap mm/rmap.c:1237 [inline] page_remove_rmap+0x5ce/0x11d0 mm/rmap.c:1330 zap_pte_range mm/memory.c:1080 [inline] zap_pmd_range mm/memory.c:1184 [inline] zap_pud_range mm/memory.c:1213 [inline] zap_p4d_range mm/memory.c:1234 [inline] unmap_page_range+0xdd5/0x2810 mm/memory.c:1255 unmap_single_vma+0x19d/0x300 mm/memory.c:1300 unmap_vmas+0x184/0x2f0 mm/memory.c:1332 exit_mmap+0x2ba/0x530 mm/mmap.c:3151 __mmput kernel/fork.c:1082 [inline] mmput+0x179/0x4d0 kernel/fork.c:1103 exit_mm kernel/exit.c:485 [inline] do_exit+0xae4/0x2f70 kernel/exit.c:788 do_group_exit+0x135/0x360 kernel/exit.c:899 get_signal+0x47c/0x24f0 kernel/signal.c:2733 do_signal+0x87/0x1700 arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x676/0x790 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x414ce1 Code: 75 14 b8 02 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 19 00 00 c3 48 83 ec 08 e8 0a fa ff ff 48 89 04 24 b8 02 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fa ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007fd4cd60a7a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: 0000000000000004 RBX: 6666666666666667 RCX: 0000000000414ce1 RDX: 0000000000000000 RSI: 0000000000060001 RDI: 00007fd4cd60a850 RBP: 000000000075bf20 R08: 000000000000000f R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007fd4cd60b6d4 R13: 00000000004cc240 R14: 00000000004e6f30 R15: 00000000ffffffff