From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752139AbeA0B3G (ORCPT ); Fri, 26 Jan 2018 20:29:06 -0500 Received: from mail-io0-f179.google.com ([209.85.223.179]:46119 "EHLO mail-io0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751932AbeA0B3C (ORCPT ); Fri, 26 Jan 2018 20:29:02 -0500 X-Google-Smtp-Source: AH8x226emug6HNjQqJLCMBG3qS01szbyQdRCzhuAL/k0NSmZ29c0Jj1p41o8zMGMAJv3Meka3h/spQ== Date: Fri, 26 Jan 2018 17:28:59 -0800 From: Eric Biggers To: syzbot Cc: hpa@zytor.com, jkosina@suse.cz, jpoimboe@redhat.com, linux-kernel@vger.kernel.org, luto@kernel.org, mark.rutland@arm.com, mingo@redhat.com, pmladek@suse.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, thgarnie@google.com, x86@kernel.org Subject: Re: general protection fault in lockdep_invariant_state (2) Message-ID: <20180127012859.q6ehezq5qhvjzs6y@gmail.com> References: <001a114498f6446843055d744c3a@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <001a114498f6446843055d744c3a@google.com> User-Agent: NeoMutt/20170609 (1.8.3) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Nov 08, 2017 at 12:16:00AM -0800, syzbot wrote: > Hello, > > syzkaller hit the following crash on > 5a3517e009e979f21977d362212b7729c5165d92 > git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/master > compiler: gcc (GCC) 7.1.1 20170620 > .config is attached > Raw console output is attached. > C reproducer is attached > syzkaller reproducer is attached. See https://goo.gl/kgGztJ > for information about syzkaller reproducers > > > R13: 0000000000402260 R14: 00000000004022f0 R15: 0000000000000000 > kasan: CONFIG_KASAN_INLINE enabled > kasan: GPF could be caused by NULL-ptr deref or user memory access > general protection fault: 0000 [#1] SMP KASAN > Dumping ftrace buffer: > (ftrace buffer empty) > Modules linked in: > CPU: 3 PID: 2982 Comm: syzkaller521009 Not tainted 4.14.0-rc7-next-20171103+ > #10 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 > task: ffff88003d6b25c0 task.stack: ffff88003abd0000 > RIP: 0010:invalidate_xhlock kernel/locking/lockdep.c:4719 [inline] > RIP: 0010:lockdep_invariant_state+0xd6/0x120 kernel/locking/lockdep.c:4793 > RSP: 0018:ffff88003abd7e38 EFLAGS: 00010002 > RAX: dffffc0000000000 RBX: 0000000000001d88 RCX: ffffffff81008d3f > RDX: 00000000000003bc RSI: 0000000000000000 RDI: 0000000000001de0 > RBP: ffff88003abd7e48 R08: ffffffff85f3b680 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 > R13: ffff88003abd7ee0 R14: ffff88003d6b25c0 R15: ffffffff85ecb390 > FS: 0000000002024880(0000) GS:ffff88006df00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00005585762cd008 CR3: 000000003a704000 CR4: 00000000000006e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > lockdep_sys_exit+0x47/0xf0 kernel/locking/lockdep.c:4629 > prepare_exit_to_usermode arch/x86/entry/common.c:192 [inline] > syscall_return_slowpath+0x244/0x510 arch/x86/entry/common.c:266 > ret_from_fork+0x15/0x40 arch/x86/entry/entry_64.S:424 > RIP: 0033:0x4358a9 > RSP: 002b:0000000020218fa0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 > RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00000000004358a9 > RDX: 0000000020acc000 RSI: 0000000020218fa0 RDI: 0000000000000000 > RBP: 0000000000000000 R08: 00000000201fa000 R09: 0000000000000000 > R10: 000000002097b000 R11: 0000000000000246 R12: 0000000000000001 > R13: 0000000000402260 R14: 00000000004022f0 R15: 0000000000000000 > Code: 83 90 11 00 00 83 e0 3f 48 89 c2 48 c1 e2 04 48 29 c2 48 b8 00 00 00 > 00 00 fc ff df 49 8d 1c d4 48 8d 7b 58 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 > 2f 48 c7 43 58 00 00 00 00 5b 41 5c 5d c3 0f ff > RIP: invalidate_xhlock kernel/locking/lockdep.c:4719 [inline] RSP: > ffff88003abd7e38 > RIP: lockdep_invariant_state+0xd6/0x120 kernel/locking/lockdep.c:4793 RSP: > ffff88003abd7e38 > ---[ end trace b75e41873a1a07c3 ]--- > Kernel panic - not syncing: Fatal exception > Dumping ftrace buffer: > (ftrace buffer empty) > Kernel Offset: disabled > Rebooting in 86400 seconds.. > > > --- > This bug is generated by a dumb bot. It may contain errors. > See https://goo.gl/tpsmEJ for details. > Direct all questions to syzkaller@googlegroups.com. > Please credit me with: Reported-by: syzbot > > syzbot will keep track of this bug report. > Once a fix for this bug is committed, please reply to this email with: > #syz fix: exact-commit-title No longer occurring, seems to have been fixed by: #syz fix: locking/lockdep: Fix possible NULL deref