INFO: rcu_sched detected stalls on CPUs/tasks: (detected by 1, t=100002 jiffies, g=99192, c=99191, q=247) All QSes seen, last rcu_sched kthread activity 100002 (4295273644-4295173642), jiffies_till_next_fqs=3, root ->qsmask 0x0 kworker/u4:1 R running task 54320 23 2 0x80000008 Workqueue: writeback wb_workfn (flush-8:0) Call Trace: sched_show_task+0x610/0x760 kernel/sched/core.c:5332 print_other_cpu_stall kernel/rcu/tree.c:1441 [inline] check_cpu_stall kernel/rcu/tree.c:1559 [inline] __rcu_pending kernel/rcu/tree.c:3244 [inline] rcu_pending kernel/rcu/tree.c:3291 [inline] rcu_check_callbacks+0x2632/0x29a0 kernel/rcu/tree.c:2646 update_process_times+0x132/0x1a0 kernel/time/timer.c:1636 tick_sched_handle kernel/time/tick-sched.c:164 [inline] tick_sched_timer+0x3bf/0x520 kernel/time/tick-sched.c:1274 __run_hrtimer kernel/time/hrtimer.c:1398 [inline] __hrtimer_run_queues+0xc74/0x1680 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:__read_once_size include/linux/compiler.h:197 [inline] RIP: 0010:csd_lock_wait kernel/smp.c:108 [inline] RIP: 0010:smp_call_function_single+0x35b/0x500 kernel/smp.c:302 Code: 00 e8 89 c5 12 00 e9 be 00 00 00 8b 3a e8 fd 79 6e 00 45 85 f6 74 91 41 89 de eb 08 0f 1f 00 e8 6b c5 12 00 f3 90 8b 5c 24 58 <4c> 89 e7 e8 bd 6f 6e 00 8b 00 83 e0 01 83 e3 01 85 c0 74 06 f7 d0 RSP: 0018:ffff8801d123e7e0 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffffffff81555f95 RBX: 0000000000000003 RCX: ffff8801d10dbb00 RDX: 0000000000000000 RSI: aaaaaaaaaaaab000 RDI: ffffea000ae6d740 RBP: ffff8801d123e8b8 R08: 0000000000000000 R09: 0000000000000002 R10: 0000000000000000 R11: ffffffff8117d090 R12: ffff8801d123e838 R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801d10dc400 smp_call_function_many+0x672/0xe30 kernel/smp.c:434 native_flush_tlb_others+0x4e9/0x510 arch/x86/mm/tlb.c:595 flush_tlb_mm_range+0x358/0x490 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+0x4d2/0x890 mm/rmap.c:915 rmap_walk_file+0x727/0xf30 mm/rmap.c:1850 rmap_walk mm/rmap.c:1868 [inline] page_mkclean+0x387/0x530 mm/rmap.c:984 clear_page_dirty_for_io+0x4c7/0x1040 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+0xd03/0x1440 fs/ext4/inode.c:2682 ext4_writepages+0x20b3/0x6ef0 fs/ext4/inode.c:2809 do_writepages+0x1ad/0x3f0 mm/page-writeback.c:2341 __writeback_single_inode+0x410/0x1500 fs/fs-writeback.c:1323 writeback_sb_inodes+0x908/0x2b80 fs/fs-writeback.c:1587 __writeback_inodes_wb+0x1e4/0x690 fs/fs-writeback.c:1656 wb_writeback+0xa33/0x1440 fs/fs-writeback.c:1765 wb_check_background_flush fs/fs-writeback.c:1833 [inline] wb_do_writeback fs/fs-writeback.c:1921 [inline] wb_workfn+0x1600/0x21c0 fs/fs-writeback.c:1949 process_one_work+0x1655/0x2000 kernel/workqueue.c:2153 worker_thread+0x1136/0x2490 kernel/workqueue.c:2296 kthread+0x473/0x4b0 kernel/kthread.c:247 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:415 rcu_sched kthread starved for 100002 jiffies! g99192 c99191 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0 RCU grace-period kthread stack dump: rcu_sched R running task 61768 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2857 [inline] __schedule+0x652/0x780 kernel/sched/core.c:3507 schedule+0x1cc/0x300 kernel/sched/core.c:3551 schedule_timeout+0x416/0x5b0 kernel/time/timer.c:1801 rcu_gp_kthread+0x1ed1/0x3a40 kernel/rcu/tree.c:2179 kthread+0x473/0x4b0 kernel/kthread.c:247 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:415