From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qa0-f49.google.com (mail-qa0-f49.google.com [209.85.216.49]) by kanga.kvack.org (Postfix) with ESMTP id 59E0B6B0035 for ; Mon, 3 Feb 2014 11:50:15 -0500 (EST) Received: by mail-qa0-f49.google.com with SMTP id w8so10250556qac.22 for ; Mon, 03 Feb 2014 08:50:14 -0800 (PST) Received: from mail-qc0-x22d.google.com (mail-qc0-x22d.google.com [2607:f8b0:400d:c01::22d]) by mx.google.com with ESMTPS id q3si2927002qcz.1.2014.02.03.08.50.14 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 03 Feb 2014 08:50:14 -0800 (PST) Received: by mail-qc0-f173.google.com with SMTP id i8so11278573qcq.4 for ; Mon, 03 Feb 2014 08:50:14 -0800 (PST) From: kosaki.motohiro@gmail.com Subject: [PATCH] mm: __set_page_dirty_nobuffers uses spin_lock_irqseve instead of spin_lock_irq Date: Mon, 3 Feb 2014 11:49:55 -0500 Message-Id: <1391446195-9457-1-git-send-email-kosaki.motohiro@gmail.com> Sender: owner-linux-mm@kvack.org List-ID: To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, akpm@linux-foundation.org, KOSAKI Motohiro , Larry Woodman , Rik van Riel , Johannes Weiner , stable@vger.kernel.org From: KOSAKI Motohiro During aio stress test, we observed the following lockdep warning. This mean AIO+numa_balancing is currently deadlockable. The problem is, aio_migratepage disable interrupt, but __set_page_dirty_nobuffers unintentionally enable it again. Generally, all helper function should use spin_lock_irqsave() instead of spin_lock_irq() because they don't know caller at all. [ 599.843948] other info that might help us debug this: [ 599.873748] Possible unsafe locking scenario: [ 599.873748] [ 599.900902] CPU0 [ 599.912701] ---- [ 599.924929] lock(&(&ctx->completion_lock)->rlock); [ 599.950299] [ 599.962576] lock(&(&ctx->completion_lock)->rlock); [ 599.985771] [ 599.985771] *** DEADLOCK *** [ 600.375623] [] dump_stack+0x19/0x1b [ 600.398769] [] print_usage_bug+0x1f7/0x208 [ 600.425092] [] ? print_shortest_lock_dependencies+0x1d0/0x1d0 [ 600.458981] [] mark_lock+0x21d/0x2a0 [ 600.482910] [] mark_held_locks+0xb9/0x140 [ 600.508956] [] ? _raw_spin_unlock_irq+0x2c/0x50 [ 600.536825] [] trace_hardirqs_on_caller+0x105/0x1d0 [ 600.566861] [] trace_hardirqs_on+0xd/0x10 [ 600.593210] [] _raw_spin_unlock_irq+0x2c/0x50 [ 600.620599] [] __set_page_dirty_nobuffers+0x8c/0xf0 [ 600.649992] [] migrate_page_copy+0x434/0x540 [ 600.676635] [] aio_migratepage+0xb1/0x140 [ 600.703126] [] move_to_new_page+0x7d/0x230 [ 600.729022] [] migrate_pages+0x5e5/0x700 [ 600.754705] [] ? buffer_migrate_lock_buffers+0xb0/0xb0 [ 600.785784] [] migrate_misplaced_page+0xbc/0xf0 [ 600.814029] [] do_numa_page+0x102/0x190 [ 600.839182] [] handle_pte_fault+0x241/0x970 [ 600.865875] [] handle_mm_fault+0x265/0x370 [ 600.892071] [] __do_page_fault+0x172/0x5a0 [ 600.918065] [] ? retint_swapgs+0x13/0x1b [ 600.943493] [] do_page_fault+0x1a/0x70 [ 600.968081] [] page_fault+0x28/0x30 Signed-off-by: KOSAKI Motohiro Cc: Larry Woodman Cc: Rik van Riel Cc: Johannes Weiner Cc: stable@vger.kernel.org --- mm/page-writeback.c | 5 +++-- 1 files changed, 3 insertions(+), 2 deletions(-) diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 2d30e2c..7106cb1 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -2173,11 +2173,12 @@ int __set_page_dirty_nobuffers(struct page *page) if (!TestSetPageDirty(page)) { struct address_space *mapping = page_mapping(page); struct address_space *mapping2; + unsigned long flags; if (!mapping) return 1; - spin_lock_irq(&mapping->tree_lock); + spin_lock_irqsave(&mapping->tree_lock, flags); mapping2 = page_mapping(page); if (mapping2) { /* Race with truncate? */ BUG_ON(mapping2 != mapping); @@ -2186,7 +2187,7 @@ int __set_page_dirty_nobuffers(struct page *page) radix_tree_tag_set(&mapping->page_tree, page_index(page), PAGECACHE_TAG_DIRTY); } - spin_unlock_irq(&mapping->tree_lock); + spin_unlock_irqrestore(&mapping->tree_lock, flags); if (mapping->host) { /* !PageAnon && !swapper_space */ __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); -- 1.7.1 -- 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