From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f49.google.com (mail-pa0-f49.google.com [209.85.220.49]) by kanga.kvack.org (Postfix) with ESMTP id 2FA976B003A for ; Wed, 17 Sep 2014 21:50:56 -0400 (EDT) Received: by mail-pa0-f49.google.com with SMTP id lf10so332080pab.36 for ; Wed, 17 Sep 2014 18:50:55 -0700 (PDT) Received: from szxga01-in.huawei.com (szxga01-in.huawei.com. [119.145.14.64]) by mx.google.com with ESMTPS id hs3si36141527pdb.108.2014.09.17.18.50.54 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Wed, 17 Sep 2014 18:50:54 -0700 (PDT) From: Wang Nan Subject: [PATCH] cgroup/kmemleak: add kmemleak_free() for cgroup deallocations. Date: Thu, 18 Sep 2014 09:38:05 +0800 Message-ID: <1411004285-42101-1-git-send-email-wangnan0@huawei.com> MIME-Version: 1.0 Content-Type: text/plain Sender: owner-linux-mm@kvack.org List-ID: To: Johannes Weiner , Michal Hocko , Steven Rostedt Cc: cgroups@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Li Zefan Commit ff7ee93f4 introduces kmemleak_alloc() for alloc_page_cgroup(), but corresponding kmemleak_free() is missing, which makes kmemleak be wrongly disabled after memory offlining. Log is pasted at the end of this commit message. This patch add kmemleak_free() into free_page_cgroup(). During page offlining, this patch removes corresponding entries in kmemleak rbtree. After that, the freed memory can be allocated again by other subsystems without killing kmemleak. bash # for x in 1 2 3 4; do echo offline > /sys/devices/system/memory/memory$x/state ; sleep 1; done ; dmesg | grep leak [ 45.537934] Offlined Pages 32768 [ 46.617892] kmemleak: Cannot insert 0xffff880016969000 into the object search tree (overlaps existing) [ 46.617892] CPU: 0 PID: 412 Comm: sleep Not tainted 3.17.0-rc5+ #86 [ 46.617892] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 46.617892] ffff880016823d10 ffff880018bdfc38 ffffffff81725d2c ffff88001780e950 [ 46.617892] ffff880016969000 ffff880018bdfc88 ffffffff8117a9e6 ffff880018bdfc78 [ 46.617892] 0000000000000096 ffff880017812800 ffffffff81c2eda0 ffff880016969000 [ 46.617892] Call Trace: [ 46.617892] [] dump_stack+0x46/0x58 [ 46.617892] [] create_object+0x266/0x2c0 [ 46.617892] [] kmemleak_alloc+0x26/0x50 [ 46.617892] [] kmem_cache_alloc+0xd3/0x160 [ 46.617892] [] __sigqueue_alloc+0x49/0xd0 [ 46.617892] [] __send_signal+0xcb/0x410 [ 46.617892] [] send_signal+0x45/0x90 [ 46.617892] [] __group_send_sig_info+0x13/0x20 [ 46.617892] [] do_notify_parent+0x1bb/0x260 [ 46.617892] [] ? sched_move_task+0xaa/0x130 [ 46.617892] [] do_exit+0x767/0xa40 [ 46.617892] [] do_group_exit+0x44/0xa0 [ 46.617892] [] SyS_exit_group+0x17/0x20 [ 46.617892] [] system_call_fastpath+0x16/0x1b [ 46.617892] kmemleak: Kernel memory leak detector disabled [ 46.617892] kmemleak: Object 0xffff880016900000 (size 524288): [ 46.617892] kmemleak: comm "swapper/0", pid 0, jiffies 4294667296 [ 46.617892] kmemleak: min_count = 0 [ 46.617892] kmemleak: count = 0 [ 46.617892] kmemleak: flags = 0x1 [ 46.617892] kmemleak: checksum = 0 [ 46.617892] kmemleak: backtrace: [ 46.617892] [] log_early+0x63/0x77 [ 46.617892] [] kmemleak_alloc+0x4b/0x50 [ 46.617892] [] init_section_page_cgroup+0x7f/0xf5 [ 46.617892] [] page_cgroup_init+0xc5/0xd0 [ 46.617892] [] start_kernel+0x333/0x408 [ 46.617892] [] x86_64_start_reservations+0x2a/0x2c [ 46.617892] [] x86_64_start_kernel+0xf5/0xfc [ 46.617892] [] 0xffffffffffffffff Signed-off-by: Wang Nan Cc: Steven Rostedt --- mm/page_cgroup.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/page_cgroup.c b/mm/page_cgroup.c index 3708264..5331c2b 100644 --- a/mm/page_cgroup.c +++ b/mm/page_cgroup.c @@ -171,6 +171,7 @@ static void free_page_cgroup(void *addr) sizeof(struct page_cgroup) * PAGES_PER_SECTION; BUG_ON(PageReserved(page)); + kmemleak_free(addr); free_pages_exact(addr, table_size); } } -- 1.8.4 -- 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