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[2607:7c80:54:e::133]) by mx.google.com with ESMTPS id e14si16486484pfn.203.2019.04.23.10.53.34 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 23 Apr 2019 10:53:34 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of willy@infradead.org designates 2607:7c80:54:e::133 as permitted sender) client-ip=2607:7c80:54:e::133; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=bombadil.20170209 header.b=V+AOhodA; spf=pass (google.com: best guess record for domain of willy@infradead.org designates 2607:7c80:54:e::133 as permitted sender) smtp.mailfrom=willy@infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=Hu2+IHvU0rbjKTuDhKIV7ajzUzxsMVFATjP9eUoiQdA=; b=V+AOhodAI+KAMRnXGD2WAOGJQ xPQ5d4bCeODBL2OqoCj8evwLcikkJhxk2qk5dh2E9kn+CSgyJqTsvvCYZuxJN219WNLsMnIdgCQaT Ly79tNmWBMwlhG/27ffMqzsvCfZfASKYN20e9Xz3d7iJ+NnXgIXBn1kHe2YN8jGrUSp1zwKQx54Nz Z01b+yw3jDza/c4oO9DOUwFLRUVtnwKSZtXnK6H/urYIjYe7sMGC31dg0UvgwmZbnOjI3exfVz7yS vYqqufXzb4cR/PfHUEpOSMEF8OBUWV30jwMwH3U99FNG0Ub6dRVQbaMAv5593KRL76F9wBL7C5SlE Mc/SjbtAg==; Received: from willy by bombadil.infradead.org with local (Exim 4.90_1 #2 (Red Hat Linux)) id 1hIzbi-0001CA-UI; Tue, 23 Apr 2019 17:53:26 +0000 Date: Tue, 23 Apr 2019 10:53:26 -0700 From: Matthew Wilcox To: syzbot Cc: akpm@linux-foundation.org, aneesh.kumar@linux.ibm.com, dave.jiang@intel.com, hughd@google.com, jglisse@redhat.com, jrdr.linux@gmail.com, kirill.shutemov@linux.intel.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mhocko@suse.com, rientjes@google.com, syzkaller-bugs@googlegroups.com, vbabka@suse.cz Subject: Re: WARNING: locking bug in split_huge_page_to_list Message-ID: <20190423175326.GC19031@bombadil.infradead.org> References: <0000000000003c9bea058734dc28@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0000000000003c9bea058734dc28@google.com> User-Agent: Mutt/1.9.2 (2017-12-15) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, Apr 23, 2019 at 09:13:06AM -0700, syzbot wrote: > DEBUG_LOCKS_WARN_ON(class_idx > MAX_LOCKDEP_KEYS) > WARNING: CPU: 0 PID: 1553 at kernel/locking/lockdep.c:3673 > __lock_acquire+0x1887/0x3fb0 kernel/locking/lockdep.c:3673 > down_write+0x38/0x90 kernel/locking/rwsem.c:70 > anon_vma_lock_write include/linux/rmap.h:120 [inline] All anon_vmas share the same lockdep map, so I think this is just a victim of someone else who's taken all the lockdep classes.