INFO: rcu_sched detected stalls on CPUs/tasks: (detected by 1, t=120002 jiffies, g=14815, c=14814, q=83) All QSes seen, last rcu_sched kthread activity 120002 (4294957945-4294837943), jiffies_till_next_fqs=3, root ->qsmask 0x0 kworker/u4:4 R running task 55928 113 2 0x80000008 Workqueue: writeback wb_workfn (flush-8:0) Call Trace: sched_show_task+0x610/0x740 kernel/sched/core.c:5346 print_other_cpu_stall kernel/rcu/tree.c:1481 [inline] check_cpu_stall kernel/rcu/tree.c:1599 [inline] __rcu_pending kernel/rcu/tree.c:3356 [inline] rcu_pending kernel/rcu/tree.c:3401 [inline] rcu_check_callbacks+0x277a/0x2ae0 kernel/rcu/tree.c:2763 update_process_times+0x132/0x1a0 kernel/time/timer.c:1636 tick_sched_handle kernel/time/tick-sched.c:164 [inline] tick_sched_timer+0x3ba/0x520 kernel/time/tick-sched.c:1274 __run_hrtimer kernel/time/hrtimer.c:1398 [inline] __hrtimer_run_queues+0xc54/0x1630 kernel/time/hrtimer.c:1460 hrtimer_interrupt+0x451/0x13c0 kernel/time/hrtimer.c:1518 local_apic_timer_interrupt+0x6b/0x250 arch/x86/kernel/apic/apic.c:1025 smp_apic_timer_interrupt+0x5a/0x90 arch/x86/kernel/apic/apic.c:1053 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:868 RIP: 0010:rep_nop arch/x86/include/asm/processor.h:667 [inline] RIP: 0010:cpu_relax arch/x86/include/asm/processor.h:672 [inline] RIP: 0010:csd_lock_wait kernel/smp.c:108 [inline] RIP: 0010:smp_call_function_single+0x357/0x4e0 kernel/smp.c:302 RSP: 0018:ffff8801d114e8c0 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffffffff81539255 RBX: 0000000000000001 RCX: ffff8801d1428000 RDX: 0000000000000000 RSI: aaaaaaaaaaaab000 RDI: ffffea000ae67d40 RBP: ffff8801d114e988 R08: 0000000000000000 R09: 0000000000000002 R10: 0000000000000000 R11: ffffffff81174e40 R12: ffff8801d114e938 R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801d14288d8 smp_call_function_many+0x662/0xdf0 kernel/smp.c:434 native_flush_tlb_others+0x4e8/0x500 arch/x86/mm/tlb.c:595 flush_tlb_mm_range+0x32f/0x450 arch/x86/mm/tlb.c:644 flush_tlb_page arch/x86/include/asm/tlbflush.h:526 [inline] ptep_clear_flush+0x11c/0x1f0 mm/pgtable-generic.c:87 page_mkclean_one+0x4a2/0x830 mm/rmap.c:914 rmap_walk_file+0x727/0xf30 mm/rmap.c:1844 rmap_walk mm/rmap.c:1862 [inline] page_mkclean+0x37a/0x510 mm/rmap.c:983 clear_page_dirty_for_io+0x414/0x1020 mm/page-writeback.c:2684 mpage_submit_page fs/ext4/inode.c:2190 [inline] mpage_process_page_bufs+0xa58/0xef0 fs/ext4/inode.c:2320 mpage_prepare_extent_to_map+0xcaa/0x1280 fs/ext4/inode.c:2682 ext4_writepages+0x1f77/0x6880 fs/ext4/inode.c:2809 do_writepages+0x184/0x3c0 mm/page-writeback.c:2341 __writeback_single_inode+0x3fb/0x14b0 fs/fs-writeback.c:1323 writeback_sb_inodes+0x8c7/0x2810 fs/fs-writeback.c:1587 __writeback_inodes_wb+0x1e4/0x690 fs/fs-writeback.c:1656 wb_writeback+0x964/0x1300 fs/fs-writeback.c:1765 wb_check_start_all fs/fs-writeback.c:1889 [inline] wb_do_writeback fs/fs-writeback.c:1915 [inline] wb_workfn+0x1048/0x1fb0 fs/fs-writeback.c:1949 process_one_work+0x12e4/0x1fa0 kernel/workqueue.c:2145 worker_thread+0x113c/0x24f0 kernel/workqueue.c:2279 kthread+0x4db/0x6c0 kernel/kthread.c:241 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:415 rcu_sched kthread starved for 120002 jiffies! g14815 c14814 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0 RCU grace-period kthread stack dump: rcu_sched R running task 61952 9 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2880 [inline] __schedule+0x651/0x770 kernel/sched/core.c:3524 schedule+0x1cc/0x2f0 kernel/sched/core.c:3568 schedule_timeout+0x3ef/0x580 kernel/time/timer.c:1801 rcu_gp_kthread+0x21e1/0x38d0 kernel/rcu/tree.c:2231 kthread+0x4db/0x6c0 kernel/kthread.c:241 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:415