From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <4803030D.3070906@cn.fujitsu.com> Date: Mon, 14 Apr 2008 15:09:01 +0800 From: Li Zefan MIME-Version: 1.0 Subject: kernel warning: tried to kill an mm-less task! Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: "linux-mm@kvack.org" Cc: LKML , Andrew Morton , Balbir Singh , KAMEZAWA Hiroyuki , Pavel Emelianov List-ID: 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 [] warn_on_slowpath+0x64/0xa2 [] printk+0x5e/0x7b [] page_count+0x25/0x49 [] show_mem+0x125/0x15a [] __oom_kill_task+0x6d/0x101 [] oom_kill_process+0x16c/0x22e [] select_bad_process+0xb0/0x122 [] mem_cgroup_out_of_memory+0x65/0x8a [] mem_cgroup_charge_common+0xf8/0x215 [] handle_mm_fault+0x216/0x6c8 [] follow_page+0x191/0x27d [] need_resched+0x31/0x4f [] get_user_pages+0x2f5/0x3eb [] make_pages_present+0x9e/0xca [] mmap_region+0x38c/0x452 [] arch_get_unmapped_area_topdown+0x1bf/0x2a7 [] do_mmap_pgoff+0x321/0x39b [] _cond_resched+0x1c/0x5f [] sys_mmap+0xf5/0x138 [] 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org