rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (1 GPs behind) idle=6da/1/0x4000000000000004 softirq=235538/235539 fqs=11 rcu: (t=10502 jiffies g=286333 q=286) rcu: rcu_preempt kthread starved for 4279 jiffies! g286333 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt I29136 10 2 0x80000000 Call Trace: schedule+0x8d/0x1b0 kernel/sched/core.c:3559 schedule_timeout+0x4d1/0xf20 kernel/time/timer.c:1806 rcu_gp_kthread+0xcee/0x2060 kernel/rcu/tree.c:2202 kthread+0x34a/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 NMI backtrace for cpu 1 CPU: 1 PID: 24432 Comm: syz-executor.5 Not tainted 4.19.118-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+0x188/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x170/0x1bb kernel/rcu/tree.c:1340 print_cpu_stall kernel/rcu/tree.c:1478 [inline] check_cpu_stall kernel/rcu/tree.c:1550 [inline] __rcu_pending kernel/rcu/tree.c:3293 [inline] rcu_pending kernel/rcu/tree.c:3336 [inline] rcu_check_callbacks.cold+0x634/0xddc kernel/rcu/tree.c:2682 update_process_times+0x2a/0x70 kernel/time/timer.c:1638 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:168 tick_sched_timer+0x42/0x130 kernel/time/tick-sched.c:1278 __run_hrtimer kernel/time/hrtimer.c:1401 [inline] __hrtimer_run_queues+0x2fc/0xd50 kernel/time/hrtimer.c:1463 hrtimer_interrupt+0x312/0x770 kernel/time/hrtimer.c:1521 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline] smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1092 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x50/0x80 kernel/locking/spinlock.c:192 Code: c0 58 56 d2 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 31 48 83 3d 71 4f b2 01 00 74 25 fb 66 0f 1f 44 00 00 01 00 00 00 e8 16 94 26 fa 65 8b 05 cf e6 e1 78 85 c0 74 02 5d RSP: 0018:ffff8880ae707df8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff11a4acb RBX: ffff8880ae707e70 RCX: 1ffff11014af6135 RDX: dffffc0000000000 RSI: ffff8880a57b09b0 RDI: ffff8880a57b0984 RBP: ffff8880ae723a00 R08: ffff8880a57b0100 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 R13: ffffffff85b047b0 R14: ffff8880ae723a00 R15: ffff88809588cc90 expire_timers kernel/time/timer.c:1362 [inline] __run_timers kernel/time/timer.c:1684 [inline] __run_timers kernel/time/timer.c:1652 [inline] run_timer_softirq+0x5c5/0x1540 kernel/time/timer.c:1697 __do_softirq+0x26c/0x93c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x17b/0x1c0 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:544 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1094 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893 RIP: 0010:lock_release+0xa/0x820 kernel/locking/lockdep.c:3916 Code: 00 bb 9f 8b e8 b7 cc 4d 00 e9 fb fe ff ff 48 c7 c7 00 bb 9f 8b e8 a6 cc 4d 00 e9 88 fd ff ff 90 48 b8 00 00 00 00 00 fc ff df <41> 57 41 56 41 55 41 54 49 89 d4 55 48 89 fd 53 48 83 c4 80 48 c7 RSP: 0018:ffff88820f5cf718 EFLAGS: 00000217 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8156809c RDX: ffffffff81a34b6f RSI: 0000000000000001 RDI: ffffffff88d929a0 RBP: ffffea00013fb940 R08: ffff8880a57b0100 R09: ffffed1015ce4733 R10: ffffed1015ce4732 R11: ffff8880ae723993 R12: ffffea00013fb948 R13: 0000000000000000 R14: 0000000000000000 R15: dead000000000100 page_remove_file_rmap mm/rmap.c:1249 [inline] page_remove_rmap+0x55e/0x1260 mm/rmap.c:1300 zap_pte_range mm/memory.c:1338 [inline] zap_pmd_range mm/memory.c:1440 [inline] zap_pud_range mm/memory.c:1469 [inline] zap_p4d_range mm/memory.c:1490 [inline] unmap_page_range+0xcec/0x1de0 mm/memory.c:1511 unmap_single_vma+0x196/0x300 mm/memory.c:1556 unmap_vmas+0xa9/0x180 mm/memory.c:1586 exit_mmap+0x2b2/0x510 mm/mmap.c:3091 __mmput kernel/fork.c:1015 [inline] mmput+0x14e/0x4a0 kernel/fork.c:1036 exit_mm kernel/exit.c:546 [inline] do_exit+0xac8/0x2f30 kernel/exit.c:867 do_group_exit+0x125/0x350 kernel/exit.c:983 get_signal+0x3ec/0x1f90 kernel/signal.c:2588 do_signal+0x8f/0x1710 arch/x86/kernel/signal.c:821 exit_to_usermode_loop+0x22b/0x2b0 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c829 Code: 0d 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f7ea03c1cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000000 RBX: 000000000078bfa8 RCX: 000000000045c829 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000078bfa8 RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bfac R13: 00007ffc4372bf0f R14: 00007f7ea03c29c0 R15: 000000000078bfac