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Date: Wed, 10 Dec 2008 16:41:26 +0900 From: Daisuke Nishimura <nishimura@....nes.nec.co.jp> To: balbir@...ux.vnet.ibm.com Cc: menage@...gle.com, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>, Daisuke Miyakawa <dmiyakawa@...gle.com>, YAMAMOTO Takashi <yamamoto@...inux.co.jp>, linux-kernel@...r.kernel.org, linux-mm@...ck.org, nishimura@....nes.nec.co.jp Subject: Re: [RFC][RFT] memcg fix cgroup_mutex deadlock when cpuset reclaims memory On Wed, 10 Dec 2008 15:19:48 +0900, Daisuke Nishimura <nishimura@....nes.nec.co.jp> wrote: > On Wed, 10 Dec 2008 10:49:47 +0530, Balbir Singh <balbir@...ux.vnet.ibm.com> wrote: > > Hi, > > > > Here is a proposed fix for the memory controller cgroup_mutex deadlock > > reported. It is lightly tested and reviewed. I need help with review > > and test. Is the reported deadlock reproducible after this patch? A > > careful review of the cpuset impact will also be highly appreciated. > > > > From: Balbir Singh <balbir@...ux.vnet.ibm.com> > > > > cpuset_migrate_mm() holds cgroup_mutex throughout the duration of > > do_migrate_pages(). The issue with that is that > > > > 1. It can lead to deadlock with memcg, as do_migrate_pages() > > enters reclaim > > 2. It can lead to long latencies, preventing users from creating/ > > destroying other cgroups anywhere else > > > > The patch holds callback_mutex through the duration of cpuset_migrate_mm() and > > gives up cgroup_mutex while doing so. > > > I agree changing cpuset_migrate_mm not to hold cgroup_mutex to fix the dead lock > is one choice, and it looks good to me at the first impression. > > But I'm not sure it's good to change cpuset(other subsystem) code because of memcg. > > Anyway, I'll test this patch and report the result tomorrow. > (Sorry, I don't have enough time today.) > Unfortunately, this patch doesn't seem enough. This patch can fix dead lock caused by "circular lock of cgroup_mutex", but cannot that of caused by "race between page reclaim and cpuset_attach(mpol_rebind_mm)". (The dead lock I fixed in memcg-avoid-dead-lock-caused-by-race-between-oom-and-cpuset_attach.patch was caused by "race between memcg's oom and mpol_rebind_mm, and was independent of hierarchy.) I attach logs I got in testing this patch. Thanks, Daisuke Nishimura. === INFO: task automount:23438 blocked for more than 480 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. automount D ffff88010ae963c0 0 23438 1 ffff8803ab8f9300 0000000000000046 0000000000000000 0000000000000000 ffff88010fb72600 ffff8803ab8f9670 0000000d00000000 0000000100026d3a ffffffffffffffff ffffffffffffffff ffffffffffffffff 7fffffffffffffff Call Trace: [<ffffffff802699c3>] cgroup_show_options+0x20/0xa3 [<ffffffff804ce493>] mutex_lock_nested+0x188/0x2b2 [<ffffffff802699c3>] cgroup_show_options+0x20/0xa3 [<ffffffff802c6490>] mntput_no_expire+0x1e/0x139 [<ffffffff802c85ab>] seq_escape+0x3a/0xb8 [<ffffffff802699c3>] cgroup_show_options+0x20/0xa3 [<ffffffff802c80d6>] show_vfsmnt+0xd7/0xf5 [<ffffffff802c8d2a>] seq_read+0x20c/0x2e5 [<ffffffff802b2723>] vfs_read+0xaa/0x133 [<ffffffff802b3234>] fget_light+0x49/0xe1 [<ffffffff802b2a18>] sys_read+0x45/0x6e [<ffffffff8020bedb>] system_call_fastpath+0x16/0x1b INFO: lockdep is turned off. INFO: task automount:24873 blocked for more than 480 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. automount D ffff88010ae963c0 0 24873 1 ffff8803ab8fcc00 0000000000000046 0000000000000000 0000000000000000 ffff8803afbe4c00 ffff8803ab8fcf70 0000000f00000000 0000000100029028 ffffffffffffffff ffffffffffffffff ffffffffffffffff 7fffffffffffffff Call Trace: [<ffffffff802699c3>] cgroup_show_options+0x20/0xa3 [<ffffffff804ce493>] mutex_lock_nested+0x188/0x2b2 [<ffffffff802699c3>] cgroup_show_options+0x20/0xa3 [<ffffffff802c6490>] mntput_no_expire+0x1e/0x139 [<ffffffff802c85ab>] seq_escape+0x3a/0xb8 [<ffffffff802699c3>] cgroup_show_options+0x20/0xa3 [<ffffffff802c80d6>] show_vfsmnt+0xd7/0xf5 [<ffffffff802c8d2a>] seq_read+0x20c/0x2e5 [<ffffffff802b2723>] vfs_read+0xaa/0x133 [<ffffffff802b3234>] fget_light+0x49/0xe1 [<ffffffff802b2a18>] sys_read+0x45/0x6e [<ffffffff8020bedb>] system_call_fastpath+0x16/0x1b INFO: lockdep is turned off. INFO: task mmapstress10:21307 blocked for more than 480 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. mmapstress10 D ffff88010acb84c0 0 21307 14494 ffff88010ad8df00 0000000000000046 0000000000000000 0000000000000000 ffff88010fada600 ffff88010ad8e270 0000000700000000 000000010002983e ffffffffffffffff ffffffffffffffff ffffffffffffffff 7fffffffffffffff Call Trace: [<ffffffff802ae443>] mem_cgroup_get_first_node+0x29/0x8a [<ffffffff804ce493>] mutex_lock_nested+0x188/0x2b2 [<ffffffff802ae443>] mem_cgroup_get_first_node+0x29/0x8a [<ffffffff802ae443>] mem_cgroup_get_first_node+0x29/0x8a [<ffffffff802ae4f0>] mem_cgroup_hierarchical_reclaim+0x4c/0xc6 [<ffffffff802ae9f4>] __mem_cgroup_try_charge+0x151/0x1d1 [<ffffffff802ae8e3>] __mem_cgroup_try_charge+0x40/0x1d1 [<ffffffff802af2d8>] mem_cgroup_charge_common+0x46/0x72 [<ffffffff80291440>] do_wp_page+0x45a/0x646 [<ffffffff80292d85>] handle_mm_fault+0x6a8/0x737 [<ffffffff80292db6>] handle_mm_fault+0x6d9/0x737 [<ffffffff804d2371>] do_page_fault+0x3ab/0x753 [<ffffffff804d034f>] page_fault+0x1f/0x30 INFO: lockdep is turned off. INFO: task shmem_test_02:22746 blocked for more than 480 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. shmem_test_02 D ffff88010ac81c80 0 22746 14216 ffff8800bf1fa600 0000000000000046 0000000000000000 0000000000000000 ffff88010fa9a600 ffff8800bf1fa970 0000000400000000 000000010002593a ffffffffffffffff ffffffffffffffff ffffffffffffffff 7fffffffffffffff Call Trace: [<ffffffff802ae443>] mem_cgroup_get_first_node+0x29/0x8a [<ffffffff804ce493>] mutex_lock_nested+0x188/0x2b2 [<ffffffff802ae443>] mem_cgroup_get_first_node+0x29/0x8a [<ffffffff802ae443>] mem_cgroup_get_first_node+0x29/0x8a [<ffffffff802ae4f0>] mem_cgroup_hierarchical_reclaim+0x4c/0xc6 [<ffffffff802ae9f4>] __mem_cgroup_try_charge+0x151/0x1d1 [<ffffffff802ae8e3>] __mem_cgroup_try_charge+0x40/0x1d1 [<ffffffff802af2d8>] mem_cgroup_charge_common+0x46/0x72 [<ffffffff8028c9fe>] shmem_getpage+0x6ae/0x851 [<ffffffff8022e1f0>] task_rq_lock+0x44/0x78 [<ffffffff804cf73d>] trace_hardirqs_on_thunk+0x3a/0x3f [<ffffffff804cf73d>] trace_hardirqs_on_thunk+0x3a/0x3f [<ffffffff8020e304>] do_IRQ+0x139/0x15d [<ffffffff802c7b8d>] mnt_want_write+0x6e/0x76 [<ffffffff802c604c>] mnt_drop_write+0x25/0xec [<ffffffff8028cc3b>] shmem_fault+0x3a/0x5f [<ffffffff802909be>] __do_fault+0x51/0x402 [<ffffffff8029289e>] handle_mm_fault+0x1c1/0x737 [<ffffffff804d2371>] do_page_fault+0x3ab/0x753 [<ffffffff804d034f>] page_fault+0x1f/0x30 INFO: lockdep is turned off. INFO: task move.sh:22750 blocked for more than 480 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. move.sh D ffff88010b4ab900 0 22750 19661 ffff8803ab8fdf00 0000000000000046 0000000000000000 0000000000000002 ffff8803afbe4c00 ffff8803ab8fe270 0000000f00000000 0000000100025624 ffffffffffffffff ffffffffffffffff ffffffffffffffff 7fffffffffffffff Call Trace: [<ffffffff804cf64e>] __down_write_nested+0x7e/0x96 [<ffffffff804ceb34>] down_write+0x64/0x75 [<ffffffff802a43c0>] mpol_rebind_mm+0x16/0x3f [<ffffffff802a43c0>] mpol_rebind_mm+0x16/0x3f [<ffffffff8026e06a>] cpuset_attach+0x7d/0xa6 [<ffffffff8026b05d>] cgroup_attach_task+0x33d/0x397 [<ffffffff8026b1b1>] cgroup_tasks_write+0xfa/0x11e [<ffffffff8026b0f0>] cgroup_tasks_write+0x39/0x11e [<ffffffff8026b66e>] cgroup_file_write+0xed/0x20b [<ffffffff802b25f0>] vfs_write+0xad/0x136 [<ffffffff802b2a86>] sys_write+0x45/0x6e [<ffffffff8020bedb>] system_call_fastpath+0x16/0x1b INFO: lockdep is turned off. INFO: task udev_run_devd:22758 blocked for more than 480 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. udev_run_devd D ffff88010eb39c80 0 22758 1 ffff8801091e8000 0000000000000046 0000000000000000 0000000000000000 ffff88010fb4cc00 ffff8801091e8370 0000000c00000000 0000000100024ffd ffffffffffffffff ffffffffffffffff ffffffffffffffff 7fffffffffffffff Call Trace: [<ffffffff802699c3>] cgroup_show_options+0x20/0xa3 [<ffffffff804ce493>] mutex_lock_nested+0x188/0x2b2 [<ffffffff802699c3>] cgroup_show_options+0x20/0xa3 [<ffffffff802c6490>] mntput_no_expire+0x1e/0x139 [<ffffffff802c85ab>] seq_escape+0x3a/0xb8 [<ffffffff802699c3>] cgroup_show_options+0x20/0xa3 [<ffffffff802c80d6>] show_vfsmnt+0xd7/0xf5 [<ffffffff802c8d2a>] seq_read+0x20c/0x2e5 [<ffffffff802b2723>] vfs_read+0xaa/0x133 [<ffffffff802b2a18>] sys_read+0x45/0x6e [<ffffffff8020bedb>] system_call_fastpath+0x16/0x1b INFO: lockdep is turned off. INFO: task ls:22850 blocked for more than 480 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. ls D ffff88010e8897c0 0 22850 8012 ffff8801091edf00 0000000000000046 0000000000000000 0000000000000000 ffff88010fb22600 ffff8801091ee270 0000000a00000000 0000000100025a97 ffffffffffffffff ffffffffffffffff ffffffffffffffff 7fffffffffffffff Call Trace: [<ffffffff802699c3>] cgroup_show_options+0x20/0xa3 [<ffffffff804ce493>] mutex_lock_nested+0x188/0x2b2 [<ffffffff802699c3>] cgroup_show_options+0x20/0xa3 [<ffffffff802c6490>] mntput_no_expire+0x1e/0x139 [<ffffffff802c85ab>] seq_escape+0x3a/0xb8 [<ffffffff802699c3>] cgroup_show_options+0x20/0xa3 [<ffffffff802c80d6>] show_vfsmnt+0xd7/0xf5 [<ffffffff802c8d2a>] seq_read+0x20c/0x2e5 [<ffffffff802b2723>] vfs_read+0xaa/0x133 [<ffffffff802b2a18>] sys_read+0x45/0x6e [<ffffffff8020bedb>] system_call_fastpath+0x16/0x1b INFO: lockdep is turned off. INFO: task multipath:27599 blocked for more than 480 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. multipath D ffff88010b4af200 0 27599 1 ffff8800ba971300 0000000000000046 0000000000000000 0000000000000000 ffff8803afbe4c00 ffff8800ba971670 0000000f00000000 0000000100051678 ffffffffffffffff ffffffffffffffff ffffffffffffffff 7fffffffffffffff Call Trace: [<ffffffff802699c3>] cgroup_show_options+0x20/0xa3 [<ffffffff804ce493>] mutex_lock_nested+0x188/0x2b2 [<ffffffff802699c3>] cgroup_show_options+0x20/0xa3 [<ffffffff802c6490>] mntput_no_expire+0x1e/0x139 [<ffffffff802c85ab>] seq_escape+0x3a/0xb8 [<ffffffff802699c3>] cgroup_show_options+0x20/0xa3 [<ffffffff802c80d6>] show_vfsmnt+0xd7/0xf5 [<ffffffff802c8d2a>] seq_read+0x20c/0x2e5 [<ffffffff802b2723>] vfs_read+0xaa/0x133 [<ffffffff802b2a18>] sys_read+0x45/0x6e [<ffffffff8020bedb>] system_call_fastpath+0x16/0x1b INFO: lockdep is turned off. INFO: task udev_run_hotplu:27601 blocked for more than 480 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. udev_run_hotp D ffff88010e476880 0 27601 1 ffff8801091ea600 0000000000000046 0000000000000000 0000000000000000 ffff88010fb48000 ffff8801091ea970 0000000b00000000 0000000100051867 ffffffffffffffff ffffffffffffffff ffffffffffffffff 7fffffffffffffff Call Trace: [<ffffffff802699c3>] cgroup_show_options+0x20/0xa3 [<ffffffff804ce493>] mutex_lock_nested+0x188/0x2b2 [<ffffffff802699c3>] cgroup_show_options+0x20/0xa3 [<ffffffff802c6490>] mntput_no_expire+0x1e/0x139 [<ffffffff802c85ab>] seq_escape+0x3a/0xb8 [<ffffffff802699c3>] cgroup_show_options+0x20/0xa3 [<ffffffff802c80d6>] show_vfsmnt+0xd7/0xf5 [<ffffffff802c8d2a>] seq_read+0x20c/0x2e5 [<ffffffff802b2723>] vfs_read+0xaa/0x133 [<ffffffff802b2a18>] sys_read+0x45/0x6e [<ffffffff8020bedb>] system_call_fastpath+0x16/0x1b INFO: lockdep is turned off. === -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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