From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 86F45C43603 for ; Wed, 4 Dec 2019 08:01:33 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 64D6220640 for ; Wed, 4 Dec 2019 08:01:33 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 64D6220640 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 303256F445; Wed, 4 Dec 2019 08:01:21 +0000 (UTC) Received: from mail-io1-f70.google.com (mail-io1-f70.google.com [209.85.166.70]) by gabe.freedesktop.org (Postfix) with ESMTPS id 941E76E842 for ; Tue, 3 Dec 2019 15:52:08 +0000 (UTC) Received: by mail-io1-f70.google.com with SMTP id x10so2745306iob.2 for ; Tue, 03 Dec 2019 07:52:08 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:in-reply-to:message-id:subject :from:to; bh=qWkyIPu2o6vdgwTgEGOSkN6/EDBPIm6eU4NPNmjP8sE=; b=bjgsv6opZ68cQMCXAU6pwvfN8My2n53zkSFeZuvqrpCyngcKp9a0vL5Vm5CSoee6Cm XqKWgQ4yjROUG74xmKR3AEdpH1R0DBJpgXGEXykJQ5crQ+um6zB6vM37tK60vZVE4Eu3 8PzP/ZQwXh8vE+zjH+zqs+z28yABDaodzF1HA3LHmje3jB4ji2Ho0f1EHF7u1/voT8I3 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gregkh@linuxfoundation.org, joel@joelfernandes.org, kasan-dev@googlegroups.com, labbott@redhat.com, linaro-mm-sig-owner@lists.linaro.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org, maco@android.com, sumit.semwal@linaro.org, syzkaller-bugs@googlegroups.com, tkjos@android.com X-Mailman-Approved-At: Wed, 04 Dec 2019 08:01:16 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed"; DelSp="yes" Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" c3l6Ym90IGhhcyBmb3VuZCBhIHJlcHJvZHVjZXIgZm9yIHRoZSBmb2xsb3dpbmcgY3Jhc2ggb246 CgpIRUFEIGNvbW1pdDogICAgNzZiYjhiMDUgTWVyZ2UgdGFnICdrYnVpbGQtdjUuNScgb2YgZ2l0 Oi8vZ2l0Lmtlcm5lbC5vcmcvcC4uCmdpdCB0cmVlOiAgICAgICB1cHN0cmVhbQpjb25zb2xlIG91 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In-Reply-To: <00000000000080f1d305988bb8ba@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000ab3afd0598cead51@google.com> Subject: Re: BUG: unable to handle kernel paging request in ion_heap_clear_pages From: syzbot To: arve@android.com, christian@brauner.io, devel@driverdev.osuosl.org, dja@axtens.net, dri-devel@lists.freedesktop.org, dvyukov@google.com, gregkh@linuxfoundation.org, joel@joelfernandes.org, kasan-dev@googlegroups.com, labbott@redhat.com, linaro-mm-sig-owner@lists.linaro.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org, maco@android.com, sumit.semwal@linaro.org, syzkaller-bugs@googlegroups.com, tkjos@android.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org syzbot has found a reproducer for the following crash on: HEAD commit: 76bb8b05 Merge tag 'kbuild-v5.5' of git://git.kernel.org/p.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=159d0f36e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=dd226651cb0f364b dashboard link: https://syzkaller.appspot.com/bug?extid=be6ccf3081ce8afd1b56 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=171f677ae00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11db659ce00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+be6ccf3081ce8afd1b56@syzkaller.appspotmail.com BUG: unable to handle page fault for address: fffff52000680000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 21ffee067 P4D 21ffee067 PUD aa51c067 PMD a8372067 PTE 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 3666 Comm: ion_system_heap Not tainted 5.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:memory_is_nonzero mm/kasan/generic.c:121 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:135 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:166 [inline] RIP: 0010:check_memory_region_inline mm/kasan/generic.c:182 [inline] RIP: 0010:check_memory_region+0x9c/0x1a0 mm/kasan/generic.c:192 Code: c9 4d 0f 49 c1 49 c1 f8 03 45 85 c0 0f 84 10 01 00 00 41 83 e8 01 4e 8d 44 c0 08 eb 0d 48 83 c0 08 4c 39 c0 0f 84 a7 00 00 00 <48> 83 38 00 74 ed 4c 8d 40 08 eb 09 48 83 c0 01 49 39 c0 74 53 80 RSP: 0018:ffffc9000cf87ab8 EFLAGS: 00010212 RAX: fffff52000680000 RBX: fffff52000681600 RCX: ffffffff85d95629 RDX: 0000000000000001 RSI: 000000000000b000 RDI: ffffc90003400000 RBP: ffffc9000cf87ad0 R08: fffff52000681600 R09: 0000000000001600 R10: fffff520006815ff R11: ffffc9000340afff R12: fffff52000680000 R13: 000000000000b000 R14: 0000000000000000 R15: ffffc9000cf87d08 FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffff52000680000 CR3: 00000000a6755000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: memset+0x24/0x40 mm/kasan/common.c:107 memset include/linux/string.h:365 [inline] ion_heap_clear_pages+0x49/0x70 drivers/staging/android/ion/ion_heap.c:106 ion_heap_sglist_zero+0x245/0x270 drivers/staging/android/ion/ion_heap.c:130 ion_heap_buffer_zero+0xf5/0x150 drivers/staging/android/ion/ion_heap.c:145 ion_system_heap_free+0x1eb/0x250 drivers/staging/android/ion/ion_system_heap.c:163 ion_buffer_destroy+0x159/0x2d0 drivers/staging/android/ion/ion.c:93 ion_heap_deferred_free+0x29d/0x630 drivers/staging/android/ion/ion_heap.c:239 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Modules linked in: CR2: fffff52000680000 ---[ end trace 6d0e26662c48296a ]--- RIP: 0010:memory_is_nonzero mm/kasan/generic.c:121 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:135 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:166 [inline] RIP: 0010:check_memory_region_inline mm/kasan/generic.c:182 [inline] RIP: 0010:check_memory_region+0x9c/0x1a0 mm/kasan/generic.c:192 Code: c9 4d 0f 49 c1 49 c1 f8 03 45 85 c0 0f 84 10 01 00 00 41 83 e8 01 4e 8d 44 c0 08 eb 0d 48 83 c0 08 4c 39 c0 0f 84 a7 00 00 00 <48> 83 38 00 74 ed 4c 8d 40 08 eb 09 48 83 c0 01 49 39 c0 74 53 80 RSP: 0018:ffffc9000cf87ab8 EFLAGS: 00010212 RAX: fffff52000680000 RBX: fffff52000681600 RCX: ffffffff85d95629 RDX: 0000000000000001 RSI: 000000000000b000 RDI: ffffc90003400000 RBP: ffffc9000cf87ad0 R08: fffff52000681600 R09: 0000000000001600 R10: fffff520006815ff R11: ffffc9000340afff R12: fffff52000680000 R13: 000000000000b000 R14: 0000000000000000 R15: ffffc9000cf87d08 FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffff52000680000 CR3: 00000000a6755000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400