Re: [RFC][PATCH] cgroup: fix permanent wait in rmdir

[Ingo Molnar]

FYI, there's a new cgroup related list corruption warning/crash that 
i've seen a lot of times in latest -tip tests:

[  478.555544] ------------[ cut here ]------------
[  478.556523] WARNING: at lib/list_debug.c:26 __list_add+0x70/0xa0()
[  478.556523] Hardware name:         
[  478.556523] list_add corruption. next->prev should be prev (ffff88003e640448), but was ffff88003fa1a6e8. (next=ffff88003fa1a8a0).
[  478.556523] Modules linked in:
[  478.556523] Pid: 470, comm: kswapd0 Not tainted 2.6.30-tip #10989
[  478.556523] Call Trace:
[  478.556523]  [<ffffffff81306150>] ? __list_add+0x70/0xa0
[  478.556523]  [<ffffffff810598dc>] warn_slowpath_common+0x8c/0xc0
[  478.556523]  [<ffffffff81059999>] warn_slowpath_fmt+0x69/0x70
[  478.556523]  [<ffffffff81086e3b>] ? __lock_acquired+0x18b/0x2b0
[  478.556523]  [<ffffffff811022f0>] ? page_check_address+0x110/0x1a0
[  478.556523]  [<ffffffff812ebcf2>] ? cpumask_any_but+0x42/0xb0
[  478.556523]  [<ffffffff8108c528>] ? __lock_release+0x38/0x90
[  478.556523]  [<ffffffff811024e1>] ? page_referenced_one+0x91/0x120
[  478.556523]  [<ffffffff81306150>] __list_add+0x70/0xa0
[  478.556523]  [<ffffffff8111dc63>] mem_cgroup_add_lru_list+0x63/0x70
[  478.556523]  [<ffffffff810eaee4>] move_active_pages_to_lru+0xf4/0x180
[  478.556523]  [<ffffffff810eb758>] ? shrink_active_list+0x1f8/0x2a0
[  478.556523]  [<ffffffff810eb758>] ? shrink_active_list+0x1f8/0x2a0
[  478.556523]  [<ffffffff810eb794>] shrink_active_list+0x234/0x2a0
[  478.556523]  [<ffffffff810ec3c3>] shrink_zone+0x173/0x1f0
[  478.556523]  [<ffffffff810ece0a>] balance_pgdat+0x4da/0x4e0
[  478.556523]  [<ffffffff810eb240>] ? isolate_pages_global+0x0/0x60
[  478.556523]  [<ffffffff810ed3b6>] kswapd+0x106/0x150
[  478.556523]  [<ffffffff810752f0>] ? autoremove_wake_function+0x0/0x40
[  478.556523]  [<ffffffff810ed2b0>] ? kswapd+0x0/0x150
[  478.556523]  [<ffffffff8107516e>] kthread+0x9e/0xb0
[  478.556523]  [<ffffffff8100d2ba>] child_rip+0xa/0x20
[  478.556523]  [<ffffffff8100cc40>] ? restore_args+0x0/0x30
[  478.556523]  [<ffffffff81075085>] ? kthreadd+0xb5/0x100
[  478.556523]  [<ffffffff810750d0>] ? kthread+0x0/0xb0
[  478.556523]  [<ffffffff8100d2b0>] ? child_rip+0x0/0x20
[  478.556523] ---[ end trace 9f3122957c34141e ]---
[  484.923530] ------------[ cut here ]------------
[  484.924525] WARNING: at lib/list_debug.c:26 __list_add+0x70/0xa0()
[  484.924525] Hardware name:         
[  484.924525] list_add corruption. next->prev should be prev (ffff88003e640448), but was ffff88003fa192e8. (next=ffff88003fa14d88).
[  484.941152] Modules linked in:
[  484.941152] Pid: 470, comm: kswapd0 Tainted: G        W  2.6.30-tip #10989
[  484.941152] Call Trace:
[  484.941152]  [<ffffffff81306150>] ? __list_add+0x70/0xa0
[  484.941152]  [<ffffffff810598dc>] warn_slowpath_common+0x8c/0xc0
[  484.941152]  [<ffffffff81059999>] warn_slowpath_fmt+0x69/0x70
[  484.941152]  [<ffffffff81086e3b>] ? __lock_acquired+0x18b/0x2b0
[  484.941152]  [<ffffffff811022f0>] ? page_check_address+0x110/0x1a0
[  484.941152]  [<ffffffff812ebcf2>] ? cpumask_any_but+0x42/0xb0
[  484.941152]  [<ffffffff8108c528>] ? __lock_release+0x38/0x90
[  484.941152]  [<ffffffff811024e1>] ? page_referenced_one+0x91/0x120
[  484.941152]  [<ffffffff81306150>] __list_add+0x70/0xa0
[  484.941152]  [<ffffffff8111dc63>] mem_cgroup_add_lru_list+0x63/0x70
[  484.941152]  [<ffffffff810eaee4>] move_active_pages_to_lru+0xf4/0x180
[  484.941152]  [<ffffffff810eb758>] ? shrink_active_list+0x1f8/0x2a0
[  484.941152]  [<ffffffff810eb758>] ? shrink_active_list+0x1f8/0x2a0
[  484.941152]  [<ffffffff810eb794>] shrink_active_list+0x234/0x2a0
[  484.941152]  [<ffffffff810ec3c3>] shrink_zone+0x173/0x1f0
[  484.941152]  [<ffffffff810ece0a>] balance_pgdat+0x4da/0x4e0
[  484.941152]  [<ffffffff810eb240>] ? isolate_pages_global+0x0/0x60
[  484.941152]  [<ffffffff810ed3b6>] kswapd+0x106/0x150
[  484.941152]  [<ffffffff810752f0>] ? autoremove_wake_function+0x0/0x40
[  484.941152]  [<ffffffff810ed2b0>] ? kswapd+0x0/0x150
[  484.941152]  [<ffffffff8107516e>] kthread+0x9e/0xb0
[  484.941152]  [<ffffffff8100d2ba>] child_rip+0xa/0x20
[  484.941152]  [<ffffffff8100cc40>] ? restore_args+0x0/0x30
[  484.941152]  [<ffffffff81075085>] ? kthreadd+0xb5/0x100
[  484.941152]  [<ffffffff810750d0>] ? kthread+0x0/0xb0
[  484.941152]  [<ffffffff8100d2b0>] ? child_rip+0x0/0x20
[  484.941152] ---[ end trace 9f3122957c34141f ]---
[  485.365631] ------------[ cut here ]------------
[  485.368029] WARNING: at lib/list_debug.c:26 __list_add+0x70/0xa0()

has this been reported before? Is there a fix for it i missed?

Thanks,

	Ingo
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