bridge0: port 1(bridge_slave_0) entered forwarding state
bridge0: port 2(bridge_slave_1) entered forwarding state
bridge0: port 1(bridge_slave_0) entered forwarding state
bridge0: port 2(bridge_slave_1) entered forwarding state
hrtimer: interrupt took 18386 ns
INFO: rcu_preempt detected stalls on CPUs/tasks:
	Tasks blocked on level-0 rcu_node (CPUs 0-1): P2172
	(detected by 0, t=10502 jiffies, g=361, c=360, q=54)
kworker/u5:1    R  running task    12984  2172      2 0x00000000
Workqueue: writeback wb_workfn (flush-8:0)
 ffff88003e06b6c8 ffffffff825a39b5 ffff88003ea68000 ffff88003d4bc1c0
 ffff88003db12040 ffff88003e06b6b8 ffff88003e06c000 ffff88003ac5a9b8
 ffff88003ea68000 0000000000000000 ffff88007dfc28b0 ffff88003e06b6e8
Call Trace:
 [<ffffffff825a39cb>] preempt_schedule_irq+0x5b/0xa0 kernel/sched/core.c:3217
 [<ffffffff825aa9fe>] retint_kernel+0x1b/0x2d
 [<ffffffff81271b50>] clear_page_dirty_for_io+0x180/0x2e0 mm/page-writeback.c:2689
 [<ffffffff813e5ba6>] mpage_submit_page+0x46/0x80 fs/ext4/inode.c:1867
 [<ffffffff813e5cd6>] mpage_process_page_bufs+0xf6/0x100 fs/ext4/inode.c:1973
 [<ffffffff813e681e>] mpage_prepare_extent_to_map+0x1de/0x2d0 fs/ext4/inode.c:2351
 [<ffffffff813ebde8>] ext4_writepages+0x548/0x1310 fs/ext4/inode.c:2505
 [<ffffffff8127634c>] do_writepages+0x1c/0x30 mm/page-writeback.c:2332
 [<ffffffff8131b601>] __writeback_single_inode+0x71/0xb70 fs/fs-writeback.c:1258
 [<ffffffff8131c910>] writeback_sb_inodes+0x2f0/0x6c0 fs/fs-writeback.c:1515
 [<ffffffff8131cd67>] __writeback_inodes_wb+0x87/0xb0 fs/fs-writeback.c:1561
 [<ffffffff8131d120>] wb_writeback+0x390/0x7b0 fs/fs-writeback.c:1665
 [<ffffffff8131e240>] wb_check_old_data_flush fs/fs-writeback.c:1779 [inline]
 [<ffffffff8131e240>] wb_do_writeback fs/fs-writeback.c:1822 [inline]
 [<ffffffff8131e240>] wb_workfn+0x440/0x910 fs/fs-writeback.c:1851
 [<ffffffff81185a24>] process_one_work+0x214/0x860 kernel/workqueue.c:2032
 [<ffffffff811860b9>] worker_thread+0x49/0x450 kernel/workqueue.c:2164
 [<ffffffff8118c36a>] kthread+0xea/0x100 drivers/block/aoe/aoecmd.c:1312
 [<ffffffff825aa24f>] ret_from_fork+0x3f/0x70 arch/x86/entry/entry_64.S:526
kworker/u5:1    R  running task    12984  2172      2 0x00000000
Workqueue: writeback wb_workfn (flush-8:0)
 ffff88003e06b6c8 ffffffff825a39b5 ffff88003ea68000 ffff88003d4bc1c0
 ffff88003db12040 ffff88003e06b6b8 ffff88003e06c000 ffff88003ac5a9b8
 ffff88003ea68000 0000000000000000 ffff88007dfc28b0 ffff88003e06b6e8
Call Trace:
 [<ffffffff825a39cb>] preempt_schedule_irq+0x5b/0xa0 kernel/sched/core.c:3217
 [<ffffffff825aa9fe>] retint_kernel+0x1b/0x2d
 [<ffffffff81271b50>] clear_page_dirty_for_io+0x180/0x2e0 mm/page-writeback.c:2689
 [<ffffffff813e5ba6>] mpage_submit_page+0x46/0x80 fs/ext4/inode.c:1867
 [<ffffffff813e5cd6>] mpage_process_page_bufs+0xf6/0x100 fs/ext4/inode.c:1973
 [<ffffffff813e681e>] mpage_prepare_extent_to_map+0x1de/0x2d0 fs/ext4/inode.c:2351
 [<ffffffff813ebde8>] ext4_writepages+0x548/0x1310 fs/ext4/inode.c:2505
 [<ffffffff8127634c>] do_writepages+0x1c/0x30 mm/page-writeback.c:2332
 [<ffffffff8131b601>] __writeback_single_inode+0x71/0xb70 fs/fs-writeback.c:1258
 [<ffffffff8131c910>] writeback_sb_inodes+0x2f0/0x6c0 fs/fs-writeback.c:1515
 [<ffffffff8131cd67>] __writeback_inodes_wb+0x87/0xb0 fs/fs-writeback.c:1561
 [<ffffffff8131d120>] wb_writeback+0x390/0x7b0 fs/fs-writeback.c:1665
 [<ffffffff8131e240>] wb_check_old_data_flush fs/fs-writeback.c:1779 [inline]
 [<ffffffff8131e240>] wb_do_writeback fs/fs-writeback.c:1822 [inline]
 [<ffffffff8131e240>] wb_workfn+0x440/0x910 fs/fs-writeback.c:1851
 [<ffffffff81185a24>] process_one_work+0x214/0x860 kernel/workqueue.c:2032
 [<ffffffff811860b9>] worker_thread+0x49/0x450 kernel/workqueue.c:2164
 [<ffffffff8118c36a>] kthread+0xea/0x100 drivers/block/aoe/aoecmd.c:1312
 [<ffffffff825aa24f>] ret_from_fork+0x3f/0x70 arch/x86/entry/entry_64.S:526
rcu_preempt kthread starved for 4488 jiffies! g361 c360 f0x0