| TITLE: INFO: rcu detected stall in wb_workfn |
| |
| [ 420.341960] INFO: rcu_preempt detected stalls on CPUs/tasks: |
| [ 420.347923] (detected by 1, t=10502 jiffies, g=9244, c=9243, q=178) |
| [ 420.354558] All QSes seen, last rcu_preempt kthread activity 10502 (4294979208-4294968706), jiffies_till_next_fqs=1, root ->qsmask 0x0 |
| [ 420.366779] kworker/u4:2 R running task 25560 32 2 0x00000008 |
| [ 420.374291] Workqueue: writeback wb_workfn (flush-8:0) |
| [ 420.379821] ffff8801db307ca0 ffffffff814249f9 0000000100000582 0000000100002e88 |
| [ 420.387871] dffffc0000000000 ffff8801db322880 ffffffff846e0300 ffff8801db307d70 |
| [ 420.395936] ffffffff8143035a 0000000000000000 ffffffff846def20 ffffffff846e0a18 |
| [ 420.403962] Call Trace: |
| [ 420.406526] <IRQ> [ 420.408595] [<ffffffff814249f9>] sched_show_task.cold.127+0x1c9/0x279 |
| [ 420.415289] [<ffffffff8143035a>] rcu_check_callbacks.cold.79+0xc70/0xd27 |
| [ 420.422204] [<ffffffff812a0ac0>] update_process_times+0x30/0x70 |
| [ 420.428339] [<ffffffff812cc695>] tick_sched_handle.isra.14+0x55/0xf0 |
| [ 420.434904] [<ffffffff812cceb2>] tick_sched_timer+0x72/0x120 |
| [ 420.446992] [<ffffffff812a4775>] __hrtimer_run_queues+0x375/0xe50 |
| [ 420.478026] [<ffffffff812a5cb1>] hrtimer_interrupt+0x1b1/0x430 |
| [ 420.484071] [<ffffffff810b2384>] local_apic_timer_interrupt+0x74/0xa0 |
| [ 420.490726] [<ffffffff83a0249c>] smp_apic_timer_interrupt+0x7c/0xa0 |
| [ 420.497210] [<ffffffff839fe630>] apic_timer_interrupt+0xa0/0xb0 |
| [ 420.503332] <EOI> [ 420.505397] [<ffffffff812da9eb>] ? smp_call_function_single+0x11b/0x360 |
| [ 420.518914] [<ffffffff812da9eb>] smp_call_function_single+0x11b/0x360 |
| [ 420.561741] [<ffffffff812db9ba>] smp_call_function_many+0x57a/0x6a0 |
| [ 420.579966] [<ffffffff810ed4a4>] native_flush_tlb_others+0xd4/0x510 |
| [ 420.597680] [<ffffffff810ed9ec>] flush_tlb_mm_range+0x10c/0x440 |
| [ 420.603832] [<ffffffff81500cdc>] ptep_clear_flush+0xec/0x110 |
| [ 420.609706] [<ffffffff814f05d0>] page_mkclean_one+0x100/0x220 |
| [ 420.622141] [<ffffffff814ee6f2>] rmap_walk_file+0x2c2/0x780 |
| [ 420.634853] [<ffffffff814f614d>] rmap_walk+0xed/0x180 |
| [ 420.640112] [<ffffffff814f6876>] page_mkclean+0x196/0x1d0 |
| [ 420.672156] [<ffffffff814586e0>] clear_page_dirty_for_io+0x200/0x4e0 |
| [ 420.678721] [<ffffffff8173c337>] mpage_submit_page+0x77/0x240 |
| [ 420.684675] [<ffffffff8173c8b2>] mpage_process_page_bufs+0x3b2/0x490 |
| [ 420.691270] [<ffffffff8173ff6f>] mpage_prepare_extent_to_map+0x52f/0x9a0 |
| [ 420.717326] [<ffffffff8174f609>] ext4_writepages+0xdb9/0x2e50 |
| [ 420.749218] [<ffffffff8145ef2f>] do_writepages+0xef/0x1d0 |
| [ 420.767364] [<ffffffff81601fa9>] __writeback_single_inode+0xd9/0x1020 |
| [ 420.774030] [<ffffffff81603a3c>] writeback_sb_inodes+0x4ac/0xe70 |
| [ 420.798721] [<ffffffff816044fb>] __writeback_inodes_wb+0xfb/0x1e0 |
| [ 420.805040] [<ffffffff81604c82>] wb_writeback+0x512/0xbd0 |
| [ 420.824129] [<ffffffff8160df6e>] wb_workfn+0x20e/0xdb0 |
| [ 420.841940] [<ffffffff8118d181>] process_one_work+0x7e1/0x1500 |
| [ 420.860701] [<ffffffff8118df76>] worker_thread+0xd6/0x10a0 |
| [ 420.872096] [<ffffffff8119d0ed>] kthread+0x26d/0x300 |
| [ 420.900433] [<ffffffff839fce9c>] ret_from_fork+0x5c/0x70 |
