rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 0, t=10502 jiffies, g=88257, q=114) rcu: All QSes seen, last rcu_preempt kthread activity 10471 (4295064643-4295054172), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.5 R running task 26640 7073 9641 0x80004002 Call Trace: sched_show_task kernel/sched/core.c:5954 [inline] sched_show_task.cold+0x2ee/0x35d kernel/sched/core.c:5929 print_other_cpu_stall kernel/rcu/tree_stall.h:410 [inline] check_cpu_stall kernel/rcu/tree_stall.h:538 [inline] rcu_pending kernel/rcu/tree.c:2827 [inline] rcu_sched_clock_irq.cold+0xaf4/0xc0d kernel/rcu/tree.c:2271 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:page_mapped+0x0/0x400 mm/util.c:629 Code: 06 f8 ff ff 4c 89 f7 41 89 c4 e8 8b f5 bc ff eb 03 45 31 e4 e8 e1 6a d8 ff 44 89 e0 5b 41 5c 41 5d 41 5e 5d c3 0f 1f 44 00 00 <55> 48 89 e5 41 57 41 56 41 55 41 54 49 89 fc 53 48 83 ec 18 e8 b7 RSP: 0018:ffffc9000180f010 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000040000 RBX: 0000000000000001 RCX: ffffc90014ca0000 RDX: 0000000000040000 RSI: ffffffff81996941 RDI: ffffea000073a140 RBP: ffffc9000180f1b0 R08: ffff88804e212080 R09: fffff940000e7429 R10: fffff940000e7428 R11: ffffea000073a147 R12: dffffc0000000000 R13: ffffea000073a140 R14: 0000000000000000 R15: ffffea000073a148 shrink_inactive_list+0x4e5/0xe30 mm/vmscan.c:1959 shrink_list mm/vmscan.c:2178 [inline] shrink_lruvec+0x661/0x12f0 mm/vmscan.c:2496 shrink_node_memcgs mm/vmscan.c:2685 [inline] shrink_node+0x401/0x1ad0 mm/vmscan.c:2791 shrink_zones mm/vmscan.c:2996 [inline] do_try_to_free_pages+0x3ba/0x14f0 mm/vmscan.c:3049 try_to_free_mem_cgroup_pages+0x30c/0xa70 mm/vmscan.c:3371 try_charge+0x628/0x14d0 mm/memcontrol.c:2455 mem_cgroup_try_charge+0x136/0x590 mm/memcontrol.c:6404 mem_cgroup_try_charge_delay+0x1f/0xa0 mm/memcontrol.c:6419 do_anonymous_page mm/memory.c:3154 [inline] handle_pte_fault mm/memory.c:3995 [inline] __handle_mm_fault+0x1f61/0x3cc0 mm/memory.c:4127 handle_mm_fault+0x3b2/0xa50 mm/memory.c:4164 faultin_page mm/gup.c:640 [inline] __get_user_pages+0x7b2/0x1ac0 mm/gup.c:851 populate_vma_page_range+0x20d/0x2a0 mm/gup.c:1235 __mm_populate+0x204/0x380 mm/gup.c:1283 mm_populate include/linux/mm.h:2347 [inline] __do_sys_mlockall mm/mlock.c:823 [inline] __se_sys_mlockall mm/mlock.c:799 [inline] __x64_sys_mlockall+0x473/0x520 mm/mlock.c:799 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45af49 Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fa0de718c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000097 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 000000000045af49 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa0de7196d4 R13: 00000000004c83c5 R14: 00000000004e0568 R15: 00000000ffffffff rcu: rcu_preempt kthread starved for 10471 jiffies! g88257 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29264 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x934/0x1f90 kernel/sched/core.c:4081 schedule+0xdc/0x2b0 kernel/sched/core.c:4155 schedule_timeout+0x486/0xc50 kernel/time/timer.c:1895 rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline] rcu_gp_kthread+0x9b2/0x18d0 kernel/rcu/tree.c:1821 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352