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Subjectkernel warning: tried to kill an mm-less task!
When I ran the same test program I described in a previous patch,
I got the following warning:

WARNING: at mm/oom_kill.c:320 __oom_kill_task+0x6d/0x101()
Modules linked in:

Pid: 3856, comm: a.out Not tainted 2.6.25-rc8-mm2 #37
[<ffffffff80243941>] warn_on_slowpath+0x64/0xa2
[<ffffffff80244e16>] printk+0x5e/0x7b
[<ffffffff8022b096>] page_count+0x25/0x49
[<ffffffff8022b2cd>] show_mem+0x125/0x15a
[<ffffffff8028f00f>] __oom_kill_task+0x6d/0x101
[<ffffffff8028f319>] oom_kill_process+0x16c/0x22e
[<ffffffff8028f72c>] select_bad_process+0xb0/0x122
[<ffffffff8028f8d3>] mem_cgroup_out_of_memory+0x65/0x8a
[<ffffffff802bee84>] mem_cgroup_charge_common+0xf8/0x215
[<ffffffff802a14ac>] handle_mm_fault+0x216/0x6c8
[<ffffffff8029ebca>] follow_page+0x191/0x27d
[<ffffffff80234155>] need_resched+0x31/0x4f
[<ffffffff802a1c53>] get_user_pages+0x2f5/0x3eb
[<ffffffff802a1f64>] make_pages_present+0x9e/0xca
[<ffffffff802a51fc>] mmap_region+0x38c/0x452
[<ffffffff802119c4>] arch_get_unmapped_area_topdown+0x1bf/0x2a7
[<ffffffff802a5971>] do_mmap_pgoff+0x321/0x39b
[<ffffffff805037ee>] _cond_resched+0x1c/0x5f
[<ffffffff80211715>] sys_mmap+0xf5/0x138
[<ffffffff8020c6d2>] tracesys+0xd5/0xda
---[ end trace fe959fb2f0473e7c ]---
tried to kill an mm-less task!

This showed up several times in some seconds, but then didn't appear
any more. And it's reproducable in a x86_64 box, but doesn't happen
in a x86_32 one.

And this happens both with and without the oops fixing.

Regards,
Li Zefan


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