INFO: rcu_sched detected stalls on CPUs/tasks: (detected by 1, t=125007 jiffies, g=13569, c=13568, q=97) All QSes seen, last rcu_sched kthread activity 125014 (4294911146-4294786132), jiffies_till_next_fqs=3, root ->qsmask 0x0 syz-executor0 R running task 21208 4532 4524 0x00000008 Call Trace: sched_show_task.cold.86+0x27a/0x301 kernel/sched/core.c:5321 print_other_cpu_stall.cold.79+0x92f/0x9d2 kernel/rcu/tree.c:1481 check_cpu_stall.isra.61+0x706/0xf50 kernel/rcu/tree.c:1599 __rcu_pending kernel/rcu/tree.c:3356 [inline] rcu_pending kernel/rcu/tree.c:3401 [inline] rcu_check_callbacks+0x21b/0xad0 kernel/rcu/tree.c:2763 update_process_times+0x2d/0x70 kernel/time/timer.c:1636 tick_sched_handle+0x9f/0x180 kernel/time/tick-sched.c:164 tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1274 __run_hrtimer kernel/time/hrtimer.c:1398 [inline] __hrtimer_run_queues+0x3e3/0x10a0 kernel/time/hrtimer.c:1460 hrtimer_interrupt+0x2f3/0x750 kernel/time/hrtimer.c:1518 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline] smp_apic_timer_interrupt+0x15d/0x710 arch/x86/kernel/apic/apic.c:1050 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863 RIP: 0010:shrink_dentry_list+0xb/0x7c0 fs/dcache.c:1051 RSP: 0018:ffff8801aac3fb78 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff8801aac36400 RBX: dffffc0000000000 RCX: ffffffff81c672d9 RDX: dffffc0000000000 RSI: ffffffff81c671f1 RDI: ffff8801aac3fc18 RBP: ffff8801aac3fc78 R08: ffff8801aac36400 R09: ffffed00356542c0 R10: ffffed00356542c0 R11: ffff8801ab2a1603 R12: ffff8801aac3fc50 R13: ffff8801aac3fc10 R14: 1ffff10035587f82 R15: ffffed0035587f85 vfs_rmdir+0x202/0x470 fs/namei.c:3850 do_rmdir+0x523/0x610 fs/namei.c:3911 __do_sys_rmdir fs/namei.c:3929 [inline] __se_sys_rmdir fs/namei.c:3927 [inline] __x64_sys_rmdir+0x36/0x40 fs/namei.c:3927 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455777 RSP: 002b:00007ffe4002a7d8 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffe4002c580 RDI: 00007ffe4002c580 RBP: 00007ffe4002c580 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 00000000027d3940 R13: 0000000000000000 R14: 000000000000017e R15: 000000000001cfe7 rcu_sched kthread starved for 125554 jiffies! g13569 c13568 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0 RCU grace-period kthread stack dump: rcu_sched R running task 23896 9 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2859 [inline] __schedule+0x801/0x1e30 kernel/sched/core.c:3501 schedule+0xef/0x430 kernel/sched/core.c:3545 schedule_timeout+0x138/0x240 kernel/time/timer.c:1801 rcu_gp_kthread+0x6b5/0x1940 kernel/rcu/tree.c:2231 kthread+0x345/0x410 kernel/kthread.c:240 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412