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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 28BB9C00140 for ; Sun, 21 Aug 2022 08:35:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230008AbiHUIfA (ORCPT ); Sun, 21 Aug 2022 04:35:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39588 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229379AbiHUIe6 (ORCPT ); Sun, 21 Aug 2022 04:34:58 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 207A92019B for ; Sun, 21 Aug 2022 01:34:57 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id C7439B80BA8 for ; Sun, 21 Aug 2022 08:34:55 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 25823C433D6; Sun, 21 Aug 2022 08:34:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1661070894; bh=20bfYxtW+Yr7k7ErW02zCv8pfIkLjFIGs7QupK/WDcM=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=L5hbzJagX8Wf5aRXMYM+M4Fnx7BSB5Q2rcVlJhyudGZAXI6AsRc+lSPoyYho/qtVG lzGvwCG2w56seph/1oXXqgnpTUgYZgjl3nt9vsmnQt3R6C5WdovaWXmdV84gXOornz 0NWz5pS1kRvolze5s0e92TLlWobqCUlL16sWe+No= Date: Sun, 21 Aug 2022 01:34:53 -0700 From: Andrew Morton To: syzbot Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, Alistair Popple , David Hildenbrand , Jason Gunthorpe , Alistair Popple , John Hubbard Subject: Re: [syzbot] general protection fault in sanity_check_pinned_pages Message-Id: <20220821013453.fea6ca8a3a4f241e6560ad79@linux-foundation.org> In-Reply-To: <000000000000fb7fc005e6baf0f3@google.com> References: <000000000000fb7fc005e6baf0f3@google.com> X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.33; x86_64-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 21 Aug 2022 00:04:24 -0700 syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 95d10484d66e Add linux-next specific files for 20220817 > git tree: linux-next > console+strace: https://syzkaller.appspot.com/x/log.txt?x=175b81d3080000 > kernel config: https://syzkaller.appspot.com/x/.config?x=2f5fa747986be53a > dashboard link: https://syzkaller.appspot.com/bug?extid=c14f12d4b695168145b0 > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=160e24b5080000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10f105f3080000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+c14f12d4b695168145b0@syzkaller.appspotmail.com > > general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN > KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] > CPU: 0 PID: 3608 Comm: syz-executor314 Not tainted 6.0.0-rc1-next-20220817-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 > RIP: 0010:_compound_head include/linux/page-flags.h:253 [inline] > RIP: 0010:sanity_check_pinned_pages+0x25e/0xec0 mm/gup.c:52 Thanks. Another GUP explosion. > Code: a2 06 00 00 e8 f3 8a c9 ff 4c 89 f0 48 c1 e8 03 80 3c 18 00 0f 85 8e 0a 00 00 4d 8b 26 49 8d 44 24 08 48 89 04 24 48 c1 e8 03 <80> 3c 18 00 0f 85 8b 0a 00 00 49 8b 6c 24 08 31 ff 49 89 ef 41 83 > RSP: 0018:ffffc900039df6d0 EFLAGS: 00010202 > RAX: 0000000000000001 RBX: dffffc0000000000 RCX: 0000000000000000 > RDX: ffff88802763bb00 RSI: ffffffff81b28a5d RDI: 0000000000000007 > RBP: 000000000000034e R08: 0000000000000007 R09: 0000000000000000 > R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 > R13: 0000000000000001 R14: ffffc900039df7c8 R15: 0000000000000000 > FS: 00007fc2d0fe9700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000020001600 CR3: 0000000076052000 CR4: 00000000003506f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > > unpin_user_pages_dirty_lock mm/gup.c:311 [inline] > unpin_user_pages_dirty_lock+0x4a/0x4c0 mm/gup.c:299 > rds_rdma_free_op+0x28d/0x3c0 net/rds/rdma.c:501 > rds_cmsg_rdma_args+0x32c/0x1540 net/rds/rdma.c:797 > rds_cmsg_send net/rds/send.c:1005 [inline] > rds_sendmsg+0x1c5c/0x3040 net/rds/send.c:1316 > sock_sendmsg_nosec net/socket.c:714 [inline] > sock_sendmsg+0xcf/0x120 net/socket.c:734 > ____sys_sendmsg+0x6eb/0x810 net/socket.c:2482 > ___sys_sendmsg+0x110/0x1b0 net/socket.c:2536 > __sys_sendmsg+0xf3/0x1c0 net/socket.c:2565 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x63/0xcd > RIP: 0033:0x7fc2d1036e39 > Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007fc2d0fe9308 EFLAGS: 00000246 ORIG_RAX: 000000000000002e > RAX: ffffffffffffffda RBX: 00007fc2d10bf408 RCX: 00007fc2d1036e39 > RDX: 0000000000000000 RSI: 0000000020001600 RDI: 0000000000000004 > RBP: 00007fc2d10bf400 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc2d10bf40c > R13: 00007fc2d108d004 R14: 632e79726f6d656d R15: 0000000000022000 > > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:_compound_head include/linux/page-flags.h:253 [inline] > RIP: 0010:sanity_check_pinned_pages+0x25e/0xec0 mm/gup.c:52 > Code: a2 06 00 00 e8 f3 8a c9 ff 4c 89 f0 48 c1 e8 03 80 3c 18 00 0f 85 8e 0a 00 00 4d 8b 26 49 8d 44 24 08 48 89 04 24 48 c1 e8 03 <80> 3c 18 00 0f 85 8b 0a 00 00 49 8b 6c 24 08 31 ff 49 89 ef 41 83 > RSP: 0018:ffffc900039df6d0 EFLAGS: 00010202 > RAX: 0000000000000001 RBX: dffffc0000000000 RCX: 0000000000000000 > RDX: ffff88802763bb00 RSI: ffffffff81b28a5d RDI: 0000000000000007 > RBP: 000000000000034e R08: 0000000000000007 R09: 0000000000000000 > R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 > R13: 0000000000000001 R14: ffffc900039df7c8 R15: 0000000000000000 > FS: 00007fc2d0fe9700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 000000002034d000 CR3: 0000000076052000 CR4: 00000000003506e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > ---------------- > Code disassembly (best guess): > 0: a2 06 00 00 e8 f3 8a movabs %al,0xffc98af3e8000006 > 7: c9 ff > 9: 4c 89 f0 mov %r14,%rax > c: 48 c1 e8 03 shr $0x3,%rax > 10: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) > 14: 0f 85 8e 0a 00 00 jne 0xaa8 > 1a: 4d 8b 26 mov (%r14),%r12 > 1d: 49 8d 44 24 08 lea 0x8(%r12),%rax > 22: 48 89 04 24 mov %rax,(%rsp) > 26: 48 c1 e8 03 shr $0x3,%rax > * 2a: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) <-- trapping instruction > 2e: 0f 85 8b 0a 00 00 jne 0xabf > 34: 49 8b 6c 24 08 mov 0x8(%r12),%rbp > 39: 31 ff xor %edi,%edi > 3b: 49 89 ef mov %rbp,%r15 > 3e: 41 rex.B > 3f: 83 .byte 0x83 > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@googlegroups.com. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > syzbot can test patches for this issue, for details see: > https://goo.gl/tpsmEJ#testing-patches