From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f66.google.com ([74.125.83.66]:44258 "EHLO mail-pg0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1031521AbeEZJWT (ORCPT ); Sat, 26 May 2018 05:22:19 -0400 Received: by mail-pg0-f66.google.com with SMTP id p21-v6so3273762pgd.11 for ; Sat, 26 May 2018 02:22:18 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <000000000000eb81b9056d1858c1@google.com> References: <000000000000eb81b9056d1858c1@google.com> From: Dmitry Vyukov Date: Sat, 26 May 2018 11:21:57 +0200 Message-ID: Subject: Re: general protection fault in eventfd_ctx_remove_wait_queue To: syzbot Cc: linux-fsdevel , LKML , syzkaller-bugs , Al Viro Content-Type: text/plain; charset="UTF-8" Sender: linux-fsdevel-owner@vger.kernel.org List-ID: #syz dup: KASAN: use-after-free Write in irq_bypass_register_consumer On Sat, May 26, 2018 at 11:17 AM, syzbot wrote: > 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. > > -- > You received this message because you are subscribed to the Google Groups > "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to syzkaller-bugs+unsubscribe@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/syzkaller-bugs/000000000000eb81b9056d1858c1%40google.com. > For more options, visit https://groups.google.com/d/optout.