From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-io0-f199.google.com ([209.85.223.199]:42837 "EHLO mail-io0-f199.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1031340AbeEZJRC (ORCPT ); Sat, 26 May 2018 05:17:02 -0400 Received: by mail-io0-f199.google.com with SMTP id l4-v6so6373236iog.9 for ; Sat, 26 May 2018 02:17:02 -0700 (PDT) MIME-Version: 1.0 Date: Sat, 26 May 2018 02:17:02 -0700 Message-ID: <000000000000eb81b9056d1858c1@google.com> Subject: general protection fault in eventfd_ctx_remove_wait_queue From: syzbot To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-fsdevel-owner@vger.kernel.org List-ID: Hello, syzbot found the following crash on: HEAD commit: 75bc37fefc44 Linux 4.17-rc4 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=161de3c7800000 kernel config: https://syzkaller.appspot.com/x/.config?x=31f4b3733894ef79 dashboard link: https://syzkaller.appspot.com/bug?extid=f8c4b79b3cb98d795e59 compiler: gcc (GCC) 8.0.1 20180413 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+f8c4b79b3cb98d795e59@syzkaller.appspotmail.com IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready 8021q: adding VLAN 0 to HW filter on device team0 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: 0 PID: 4 Comm: kworker/0:0 Not tainted 4.17.0-rc4+ #37 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: kvm-irqfd-cleanup irqfd_shutdown RIP: 0010:__list_del_entry_valid+0x84/0xf3 lib/list_debug.c:51 RSP: 0018:ffff8801d9a7f588 EFLAGS: 00010046 RAX: dffffc0000000000 RBX: ffff8801a87665e0 RCX: 1ffff1003644b29a RDX: 0000000000000000 RSI: ffffffff81d628fe RDI: ffff8801a87665e8 RBP: ffff8801d9a7f5a0 R08: ffff8801d9a6a100 R09: ffffed003644b291 R10: ffffed003644b291 R11: ffff8801b225948b R12: 0000000000000000 R13: 0000000000000000 R14: ffff8801a87665e0 R15: ffff8801d9a7f688 FS: 0000000000000000(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1d83a8d000 CR3: 00000001cf4a2000 CR4: 00000000001426f0 DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __list_del_entry include/linux/list.h:117 [inline] list_del include/linux/list.h:125 [inline] __remove_wait_queue include/linux/wait.h:184 [inline] eventfd_ctx_remove_wait_queue+0x16f/0x590 fs/eventfd.c:188 irqfd_shutdown+0x94/0x1a0 arch/x86/kvm/../../../virt/kvm/eventfd.c:128 process_one_work+0xc1e/0x1b50 kernel/workqueue.c:2145 worker_thread+0x1cc/0x1440 kernel/workqueue.c:2279 kthread+0x345/0x410 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Code: c5 0f 84 cc 00 00 00 48 b8 00 02 00 00 00 00 ad de 49 39 c4 0f 84 a5 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 75 5f 49 8b 14 24 48 39 da 0f 85 ba 00 00 00 48 b8 RIP: __list_del_entry_valid+0x84/0xf3 lib/list_debug.c:51 RSP: ffff8801d9a7f588 ---[ end trace 115284d8987d1fc5 ]--- --- This bug 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 bug report. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot.