Messages in this thread | | | Date | Mon, 14 Apr 2008 15:09:01 +0800 | From | Li Zefan <> | Subject | kernel warning: tried to kill an mm-less task! |
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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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