我遇到了数据库问题，提交没有完成（PostgreSQL），这似乎与填满我的服务器日志的这些消息有关：
Jan 30 02:29:45 server001 kernel: [3521062.240540] postgres D 0000000000000000 0 23220 8154 0x00000004
Jan 30 02:29:45 server001 kernel: [3521062.240550] ffff8800174c9d08 0000000000000082 ffff88041cd24728 0000000000015880
Jan 30 02:29:45 server001 kernel: [3521062.240559] ffff8806c678b110 0000000000015880 0000000000015880 0000000000015880
Jan 30 02:29:45 server001 kernel: [3521062.240567] 0000000000015880 ffff8806c678b110 0000000000015880 0000000000015880
Jan 30 02:29:45 server001 kernel: [3521062.240575] Call Trace:
Jan 30 02:29:45 server001 kernel: [3521062.240582] [<ffffffff810da010>] ? sync_page+0x0/0x50
Jan 30 02:29:45 server001 kernel: [3521062.240590] [<ffffffff81528488>] io_schedule+0x28/0x40
Jan 30 02:29:45 server001 kernel: [3521062.240596] [<ffffffff810da04d>] sync_page+0x3d/0x50
Jan 30 02:29:45 server001 kernel: [3521062.240603] [<ffffffff815289a7>] __wait_on_bit+0x57/0x80
Jan 30 02:29:45 server001 kernel: [3521062.240610] [<ffffffff810da1be>] wait_on_page_bit+0x6e/0x80
Jan 30 02:29:45 server001 kernel: [3521062.240618] [<ffffffff81078540>] ? wake_bit_function+0x0/0x40
Jan 30 02:29:45 server001 kernel: [3521062.240627] [<ffffffff810e4480>] ? pagevec_lookup_tag+0x20/0x30
Jan 30 02:29:45 server001 kernel: [3521062.240634] [<ffffffff810da665>] wait_on_page_writeback_range+0xf5/0x190
Jan 30 02:29:45 server001 kernel: [3521062.240644] [<ffffffff81053668>] ? try_to_wake_up+0x118/0x340
Jan 30 02:29:45 server001 kernel: [3521062.240651] [<ffffffff810da727>] filemap_fdatawait+0x27/0x30
Jan 30 02:29:45 server001 kernel: [3521062.240659] [<ffffffff811431b4>] vfs_fsync+0xa4/0xf0
Jan 30 02:29:45 server001 kernel: [3521062.240667] [<ffffffff81143239>] do_fsync+0x39/0x60
Jan 30 02:29:45 server001 kernel: [3521062.240674] [<ffffffff8114328b>] sys_fsync+0xb/0x10
Jan 30 02:29:45 server001 kernel: [3521062.240682] [<ffffffff81012042>] system_call_fastpath+0x16/0x1b
编辑：
我在系统日志中发现了进一步的信息：
Jan 30 02:21:45 server001 kernel: [3520582.242828] INFO: task postgres:8750 blocked for more than 120 seconds.
Jan 30 02:21:45 server001 kernel: [3520582.242873] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jan 30 02:21:45 server001 kernel: [3520582.242933] postgres D 00000000ffffffff 0 8750 8154 0x00000004
Jan 30 02:21:45 server001 kernel: [3520582.242946] ffff880415cd7d08 0000000000000082 ffff880415cd7c88 0000000000015880
Jan 30 02:21:45 server001 kernel: [3520582.242957] ffff88040dc79a60 0000000000015880 0000000000015880 0000000000015880
Jan 30 02:21:45 server001 kernel: [3520582.242965] 0000000000015880 ffff88040dc79a60 0000000000015880 0000000000015880
Jan 30 02:21:45 server001 kernel: [3520582.242974] Call Trace:
Jan 30 02:21:45 server001 kernel: [3520582.242994] [<ffffffff810da010>] ? sync_page+0x0/0x50
Jan 30 02:21:45 server001 kernel: [3520582.243006] [<ffffffff81528488>] io_schedule+0x28/0x40
Jan 30 02:21:45 server001 kernel: [3520582.243014] [<ffffffff810da04d>] sync_page+0x3d/0x50
Jan 30 02:21:45 server001 kernel: [3520582.243022] [<ffffffff815289a7>] __wait_on_bit+0x57/0x80
Jan 30 02:21:45 server001 kernel: [3520582.243029] [<ffffffff810da1be>] wait_on_page_bit+0x6e/0x80
Jan 30 02:21:45 server001 kernel: [3520582.243039] [<ffffffff81078540>] ? wake_bit_function+0x0/0x40
Jan 30 02:21:45 server001 kernel: [3520582.243049] [<ffffffff810e4480>] ? pagevec_lookup_tag+0x20/0x30
Jan 30 02:21:45 server001 kernel: [3520582.243057] [<ffffffff810da665>] wait_on_page_writeback_range+0xf5/0x190
Jan 30 02:21:45 server001 kernel: [3520582.243070] [<ffffffff811f4e9c>] ? jbd2_log_start_commit+0x3c/0x50
Jan 30 02:21:45 server001 kernel: [3520582.243078] [<ffffffff810da727>] filemap_fdatawait+0x27/0x30
Jan 30 02:21:45 server001 kernel: [3520582.243088] [<ffffffff811431b4>] vfs_fsync+0xa4/0xf0
Jan 30 02:21:45 server001 kernel: [3520582.243096] [<ffffffff81143239>] do_fsync+0x39/0x60
Jan 30 02:21:45 server001 kernel: [3520582.243103] [<ffffffff8114328b>] sys_fsync+0xb/0x10
Jan 30 02:21:45 server001 kernel: [3520582.243114] [<ffffffff81012042>] system_call_fastpath+0x16/0x1b
编辑2：
我意识到除了凌晨 2 点左右，日志中没有任何内容。但从那时起，我的数据库服务器就一直处于挂断状态。
--
运行 Ubuntu Linux 9.10，内核 2.6.31-20-server。
以前也发生过这种情况，但当时整个服务器都挂了。这次，服务器总体上可以正常工作。
我试图寻找两件事：
1) 我可以做些什么来取消挂起正在等待此操作的当前线程。 2) 什么原因导致这种情况？