服务器报错：
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Mar 15 16:27:06 yichu last message repeated 9 times
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Mar 15 16:27:06 yichu kernel: cmd mpd5 pid 56747 tried to use noield
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Mar 15 16:27:06 yichu kernel: cmd mpd5 pid 56747 tried to use non-present sched_yield
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Mar 15 16:27:06 yichu last message repeated 15 times
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Mar 15 16:27:06 yichu kernel: cmd mpd5 pid 56747 tried to use noied to use non-present sched_yield
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Mar 15 16:27:06 yichu kernel: cmd mpd5 pid 56747 tried to use non-present sched_yield
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Mar 15 16:27:06 yichu last message repeated 9 times
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Mar 15 16:27:06 yichu kernel: cmd mpd5 pid 56747 tried told
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Mar 15 16:27:06 yichu kernel: cmd mpd5 pid 56747 tried to use non-present sched_yield
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Mar 15 16:27:06 yichu last message repeated 4 times
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Mar 15 16:27:06 yichu kernel: cmd mpd5 pid 56747 tried to uspresent sched_yield
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Mar 15 16:27:06 yichu kernel: cmd mpd5 pid 56747 tried to use non-present sched_yield
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Mar 15 16:27:06 yichu last message repeated 15 times
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Mar 15 16:27:06 yichu kernel: cmd mpd5 pid 56747 triempd5 pid 56747 tried to use non-present sched_yield
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Mar 15 16:27:06 yichu kernel: cmd mpd5 pid 56747 tried to use non-present sched_yield
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Mar 15 16:27:06 yichu kernel: cmd mpd5 pid 5nt sched_yield
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Mar 15 16:27:06 yichu kernel: cmd mpd5 pid 56747 tried to use non-present sched_yield
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Mar 15 16:27:06 yichu last message repeated 8 times
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Mar 15 16:27:06 yichu kernel: cmd mpd5 pid 56747 tried to use non-pres<118>Mar 15 16:27:06 yichu last message repeated 15 times
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Mar 15 16:27:06 yichu kernel: ent sched_yield
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Mar 15 16:27:06 yichu kernel: cmd mpd5 pid 56747 tried to use non-present sched_yield
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Mar 15 16:27:06 yichu last message repeated 2 times
仔细查了原因，发现是连接mpd的用户太多（超过3000）了，用户数下降就好了。
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