rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (10500 ticks this GP) idle=f02/1/0x4000000000000004 softirq=164010/164010 fqs=0 (t=10501 jiffies g=268053 q=119) rcu: rcu_preempt kthread starved for 10502 jiffies! g268053 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29256 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3254 [inline] __schedule+0x755/0x1580 kernel/sched/core.c:3880 schedule+0xd9/0x260 kernel/sched/core.c:3947 schedule_timeout+0x486/0xc50 kernel/time/timer.c:1807 rcu_gp_fqs_loop kernel/rcu/tree.c:1611 [inline] rcu_gp_kthread+0x9b2/0x18c0 kernel/rcu/tree.c:1768 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 0 CPU: 0 PID: 23848 Comm: syz-executor.5 Not tainted 5.3.0+ #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+0x172/0x1f0 lib/dump_stack.c:113 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+0x183/0x1cf kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline] check_cpu_stall kernel/rcu/tree_stall.h:529 [inline] rcu_pending kernel/rcu/tree.c:2736 [inline] rcu_sched_clock_irq.cold+0x4dd/0xc13 kernel/rcu/tree.c:2183 update_process_times+0x32/0x80 kernel/time/timer.c:1639 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1296 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509 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:830 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x54/0x90 kernel/locking/spinlock.c:199 Code: c0 60 f4 d2 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 33 48 83 3d e5 6d 94 01 00 74 20 fb 66 0f 1f 44 00 00 01 00 00 00 e8 92 4c 10 fa 65 8b 05 73 77 c3 78 85 c0 74 06 41 RSP: 0018:ffff8880ae809dd0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff11a5e8c RBX: ffffffff85c6eac0 RCX: 1ffffffff134b9f6 RDX: dffffc0000000000 RSI: ffffffff8178032e RDI: ffffffff873e8658 RBP: ffff8880ae809dd8 R08: ffff88803786c400 R09: ffffed1015d04981 R10: ffffed1015d04980 R11: ffff8880ae824c03 R12: ffff8880ae824c00 R13: ffff888047e05588 R14: ffff8880ae824c00 R15: dffffc0000000000 expire_timers kernel/time/timer.c:1365 [inline] __run_timers kernel/time/timer.c:1685 [inline] __run_timers kernel/time/timer.c:1653 [inline] run_timer_softirq+0x685/0x17a0 kernel/time/timer.c:1698 __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:537 [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:830 RIP: 0010:pte_none arch/x86/include/asm/pgtable.h:721 [inline] RIP: 0010:zap_pte_range mm/memory.c:1026 [inline] RIP: 0010:zap_pmd_range mm/memory.c:1161 [inline] RIP: 0010:zap_pud_range mm/memory.c:1190 [inline] RIP: 0010:zap_p4d_range mm/memory.c:1211 [inline] RIP: 0010:unmap_page_range+0x8b5/0x2170 mm/memory.c:1232 Code: ff ff ff e8 8d 3e d5 ff 48 8b 85 60 ff ff ff 48 c1 e8 03 42 80 3c 38 00 0f 85 aa 14 00 00 48 8b 85 60 ff ff ff 31 ff 4c 8b 30 <4c> 89 f3 48 83 e3 9f 48 89 de e8 fc 3f d5 ff 48 85 db 0f 84 8b 08 RSP: 0018:ffff88801f8a77a0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffff888038a4f580 RBX: 00007fe032ab0000 RCX: ffffc900109be000 RDX: 0000000000040000 RSI: ffffffff819d4843 RDI: 0000000000000000 RBP: ffff88801f8a7900 R08: ffff88803786c400 R09: fffff9400032bdbf R10: fffff9400032bdbe R11: ffffea000195edf3 R12: 0000000000000000 R13: ffff88801f8a7a70 R14: 80000000657b8007 R15: dffffc0000000000 unmap_single_vma+0x19d/0x300 mm/memory.c:1277 unmap_vmas+0x135/0x280 mm/memory.c:1309 exit_mmap+0x2ba/0x530 mm/mmap.c:3145 __mmput kernel/fork.c:1066 [inline] mmput+0x179/0x4d0 kernel/fork.c:1087 copy_process+0x5b74/0x6b00 kernel/fork.c:2275 _do_fork+0x146/0xfa0 kernel/fork.c:2381 __do_sys_clone kernel/fork.c:2536 [inline] __se_sys_clone kernel/fork.c:2517 [inline] __x64_sys_clone+0x18d/0x250 kernel/fork.c:2517 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4598e9 Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fe032945c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000004598e9 RDX: 0000000020000280 RSI: 0000000020000240 RDI: 000000008e008000 RBP: 000000000075bf20 R08: 0000000020000300 R09: 0000000000000000 R10: 00000000200002c0 R11: 0000000000000246 R12: 00007fe0329466d4 R13: 00000000004bfd7f R14: 00000000004d1b78 R15: 00000000ffffffff