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Date: Thu, 14 Oct 2010 06:29:28 GMT From: "Justin Madru" <jdm64@...ab.com> To: linux-kernel@...r.kernel.org, debian-kernel@...ts.debian.org Subject: [2.6.32] dpkg blocked for more than 120 seconds when moving large files Hi, I was moving 26GB from one disk to another while dpkg was installing packages. While transferring, dpkg completely froze. I got the following kernel messages explaining that the process was blocked for more than 120 seconds. Once the transfer finished dpkg resumed. I'm running 64bit kernel version 2.6.32 (debian 2.6.32-5-amd64 version 2.6.32-23). Is this a bug? If not, why is the scheduler not being fair? [6859080.516111] INFO: task dpkg:3254 blocked for more than 120 seconds. [6859080.516141] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [6859080.516176] dpkg D ffff88000180f9f0 0 3254 3085 0x00000000 [6859080.516187] ffff8800792e0710 0000000000000086 ffff88003bb9fdb8 ffff88003bb9fdb4 [6859080.516197] 0000000000000000 0000000000000000 000000000000f8a0 ffff88003bb9ffd8 [6859080.516205] 0000000000015640 0000000000015640 ffff88003774d4c0 ffff88003774d7b8 [6859080.516214] Call Trace: [6859080.516234] [<ffffffff810b3516>] ? find_get_pages_tag+0x46/0xdd [6859080.516246] [<ffffffff8110744b>] ? bdi_sched_wait+0x0/0xe [6859080.516254] [<ffffffff81107454>] ? bdi_sched_wait+0x9/0xe [6859080.516263] [<ffffffff812f9a56>] ? __wait_on_bit+0x41/0x70 [6859080.516271] [<ffffffff8110744b>] ? bdi_sched_wait+0x0/0xe [6859080.516278] [<ffffffff812f9af0>] ? out_of_line_wait_on_bit+0x6b/0x77 [6859080.516287] [<ffffffff81064b28>] ? wake_bit_function+0x0/0x23 [6859080.516296] [<ffffffff811074cc>] ? sync_inodes_sb+0x73/0x12a [6859080.516304] [<ffffffff8110b051>] ? __sync_filesystem+0x4b/0x70 [6859080.516311] [<ffffffff8110b110>] ? sync_filesystems+0x9a/0xe3 [6859080.516317] [<ffffffff8110b19e>] ? sys_sync+0x1c/0x2e [6859080.516329] [<ffffffff81010b42>] ? system_call_fastpath+0x16/0x1b [6859320.516161] INFO: task dpkg:3408 blocked for more than 120 seconds. [6859320.516192] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [6859320.516227] dpkg D 0000000000000002 0 3408 3085 0x00000000 [6859320.516237] ffffffff8145b1f0 0000000000000082 0000000771257db8 ffff880071257e60 [6859320.516247] 0000000000000000 0000000000000000 000000000000f8a0 ffff880071257fd8 [6859320.516255] 0000000000015640 0000000000015640 ffff8800792e1530 ffff8800792e1828 [6859320.516263] Call Trace: [6859320.516282] [<ffffffff810b3516>] ? find_get_pages_tag+0x46/0xdd [6859320.516294] [<ffffffff8110744b>] ? bdi_sched_wait+0x0/0xe [6859320.516302] [<ffffffff81107454>] ? bdi_sched_wait+0x9/0xe [6859320.516311] [<ffffffff812f9a56>] ? __wait_on_bit+0x41/0x70 [6859320.516319] [<ffffffff8110744b>] ? bdi_sched_wait+0x0/0xe [6859320.516326] [<ffffffff812f9af0>] ? out_of_line_wait_on_bit+0x6b/0x77 [6859320.516335] [<ffffffff81064b28>] ? wake_bit_function+0x0/0x23 [6859320.516343] [<ffffffff811074cc>] ? sync_inodes_sb+0x73/0x12a [6859320.516352] [<ffffffff8110b051>] ? __sync_filesystem+0x4b/0x70 [6859320.516358] [<ffffffff8110b110>] ? sync_filesystems+0x9a/0xe3 [6859320.516365] [<ffffffff8110b19e>] ? sys_sync+0x1c/0x2e [6859320.516376] [<ffffffff81010b42>] ? system_call_fastpath+0x16/0x1b [6859440.516087] INFO: task dpkg:3408 blocked for more than 120 seconds. [6859440.516116] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [6859440.516151] dpkg D 0000000000000002 0 3408 3085 0x00000000 [6859440.516161] ffffffff8145b1f0 0000000000000082 0000000771257db8 ffff880071257e60 [6859440.516171] 0000000000000000 0000000000000000 000000000000f8a0 ffff880071257fd8 [6859440.516180] 0000000000015640 0000000000015640 ffff8800792e1530 ffff8800792e1828 [6859440.516188] Call Trace: [6859440.516207] [<ffffffff810b3516>] ? find_get_pages_tag+0x46/0xdd [6859440.516218] [<ffffffff8110744b>] ? bdi_sched_wait+0x0/0xe [6859440.516226] [<ffffffff81107454>] ? bdi_sched_wait+0x9/0xe [6859440.516236] [<ffffffff812f9a56>] ? __wait_on_bit+0x41/0x70 [6859440.516244] [<ffffffff8110744b>] ? bdi_sched_wait+0x0/0xe [6859440.516251] [<ffffffff812f9af0>] ? out_of_line_wait_on_bit+0x6b/0x77 [6859440.516260] [<ffffffff81064b28>] ? wake_bit_function+0x0/0x23 [6859440.516268] [<ffffffff811074cc>] ? sync_inodes_sb+0x73/0x12a [6859440.516276] [<ffffffff8110b051>] ? __sync_filesystem+0x4b/0x70 [6859440.516283] [<ffffffff8110b110>] ? sync_filesystems+0x9a/0xe3 [6859440.516290] [<ffffffff8110b19e>] ? sys_sync+0x1c/0x2e [6859440.516300] [<ffffffff81010b42>] ? system_call_fastpath+0x16/0x1b [6859560.516078] INFO: task dpkg:3408 blocked for more than 120 seconds. [6859560.516108] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [6859560.516143] dpkg D 0000000000000002 0 3408 3085 0x00000000 [6859560.516154] ffffffff8145b1f0 0000000000000082 0000000771257db8 ffff880071257e60 [6859560.516164] 0000000000000000 0000000000000000 000000000000f8a0 ffff880071257fd8 [6859560.516172] 0000000000015640 0000000000015640 ffff8800792e1530 ffff8800792e1828 [6859560.516180] Call Trace: [6859560.516200] [<ffffffff810b3516>] ? find_get_pages_tag+0x46/0xdd [6859560.516212] [<ffffffff8110744b>] ? bdi_sched_wait+0x0/0xe [6859560.516220] [<ffffffff81107454>] ? bdi_sched_wait+0x9/0xe [6859560.516230] [<ffffffff812f9a56>] ? __wait_on_bit+0x41/0x70 [6859560.516237] [<ffffffff8110744b>] ? bdi_sched_wait+0x0/0xe [6859560.516245] [<ffffffff812f9af0>] ? out_of_line_wait_on_bit+0x6b/0x77 [6859560.516254] [<ffffffff81064b28>] ? wake_bit_function+0x0/0x23 [6859560.516262] [<ffffffff811074cc>] ? sync_inodes_sb+0x73/0x12a [6859560.516270] [<ffffffff8110b051>] ? __sync_filesystem+0x4b/0x70 [6859560.516277] [<ffffffff8110b110>] ? sync_filesystems+0x9a/0xe3 [6859560.516284] [<ffffffff8110b19e>] ? sys_sync+0x1c/0x2e [6859560.516295] [<ffffffff81010b42>] ? system_call_fastpath+0x16/0x1b [6859680.520072] INFO: task dpkg:3408 blocked for more than 120 seconds. [6859680.520102] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [6859680.520137] dpkg D 0000000000000002 0 3408 3085 0x00000000 [6859680.520148] ffffffff8145b1f0 0000000000000082 0000000771257db8 ffff880071257e60 [6859680.520158] 0000000000000000 0000000000000000 000000000000f8a0 ffff880071257fd8 [6859680.520166] 0000000000015640 0000000000015640 ffff8800792e1530 ffff8800792e1828 [6859680.520175] Call Trace: [6859680.520195] [<ffffffff810b3516>] ? find_get_pages_tag+0x46/0xdd [6859680.520207] [<ffffffff8110744b>] ? bdi_sched_wait+0x0/0xe [6859680.520215] [<ffffffff81107454>] ? bdi_sched_wait+0x9/0xe [6859680.520225] [<ffffffff812f9a56>] ? __wait_on_bit+0x41/0x70 [6859680.520233] [<ffffffff8110744b>] ? bdi_sched_wait+0x0/0xe [6859680.520240] [<ffffffff812f9af0>] ? out_of_line_wait_on_bit+0x6b/0x77 [6859680.520248] [<ffffffff81064b28>] ? wake_bit_function+0x0/0x23 [6859680.520257] [<ffffffff811074cc>] ? sync_inodes_sb+0x73/0x12a [6859680.520265] [<ffffffff8110b051>] ? __sync_filesystem+0x4b/0x70 [6859680.520272] [<ffffffff8110b110>] ? sync_filesystems+0x9a/0xe3 [6859680.520279] [<ffffffff8110b19e>] ? sys_sync+0x1c/0x2e [6859680.520291] [<ffffffff81010b42>] ? system_call_fastpath+0x16/0x1b Justin Madru ----------------------------------------------------------------------------------------------------------------------- Send big files for free. 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