From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-io0-f197.google.com ([209.85.223.197]:46110 "EHLO mail-io0-f197.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758236AbeD0QAC (ORCPT ); Fri, 27 Apr 2018 12:00:02 -0400 Received: by mail-io0-f197.google.com with SMTP id j3-v6so2434473ioe.13 for ; Fri, 27 Apr 2018 09:00:02 -0700 (PDT) MIME-Version: 1.0 Date: Fri, 27 Apr 2018 09:00:01 -0700 Message-ID: <000000000000c0a706056ad69897@google.com> Subject: general protection fault in fuse_ctl_remove_conn From: syzbot To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, miklos@szeredi.hu, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-fsdevel-owner@vger.kernel.org List-ID: Hello, syzbot hit the following crash on upstream commit 0644f186fc9d77bb5bd198369e59fb28927a3692 (Thu Apr 26 23:36:11 2018 +0000) Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=32c236387d66c4516827 So far this crash happened 2 times on upstream. C reproducer: https://syzkaller.appspot.com/x/repro.c?id=6056306666373120 syzkaller reproducer: https://syzkaller.appspot.com/x/repro.syz?id=6559188280934400 Raw console output: https://syzkaller.appspot.com/x/log.txt?id=4532195645456384 Kernel config: https://syzkaller.appspot.com/x/.config?id=7043958930931867332 compiler: gcc (GCC) 8.0.1 20180413 (experimental) IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+32c236387d66c4516827@syzkaller.appspotmail.com It will help syzbot understand when the bug is fixed. See footer for details. If you forward the report, please keep this part and the footer. RBP: 0030656c69662f2e R08: 0000000020000300 R09: 0000000000003833 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe5dea3810 R13: ffffffffffffffff R14: 006c746365737566 R15: 0000000000000044 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: 4504 Comm: syz-executor777 Not tainted 4.17.0-rc2+ #19 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:fuse_ctl_remove_conn+0xc8/0x1b0 fs/fuse/control.c:286 RSP: 0018:ffff8801b0ee7968 EFLAGS: 00010202 RAX: 0000000000000075 RBX: ffff8801ac6dc2c0 RCX: ffffffff82645bb7 RDX: 0000000000000000 RSI: ffffffff82645bda RDI: 00000000000003a8 RBP: ffff8801b0ee7990 R08: ffff8801b1cd2740 R09: ffffed003b5c46c2 R10: ffffed003b5c46c2 R11: ffff8801dae23613 R12: 0000000000000001 R13: ffff8801d0bb5410 R14: dffffc0000000000 R15: 0000000000000000 FS: 00000000026bc880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001471000 CR3: 00000001b1137000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: fuse_ctl_add_conn+0x261/0x280 fs/fuse/control.c:269 fuse_ctl_fill_super+0xf7/0x160 fs/fuse/control.c:307 mount_single+0xfb/0x170 fs/super.c:1236 fuse_ctl_mount+0x2c/0x40 fs/fuse/control.c:322 mount_fs+0xae/0x328 fs/super.c:1267 vfs_kern_mount.part.34+0xd4/0x4d0 fs/namespace.c:1037 vfs_kern_mount fs/namespace.c:1027 [inline] do_new_mount fs/namespace.c:2518 [inline] do_mount+0x564/0x3070 fs/namespace.c:2848 ksys_mount+0x12d/0x140 fs/namespace.c:3064 __do_sys_mount fs/namespace.c:3078 [inline] __se_sys_mount fs/namespace.c:3075 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3075 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x440579 RSP: 002b:00007ffe5dea3808 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440579 RDX: 00000000200002c0 RSI: 0000000020000280 RDI: 0000000020000240 RBP: 0030656c69662f2e R08: 0000000020000300 R09: 0000000000003833 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe5dea3810 R13: ffffffffffffffff R14: 006c746365737566 R15: 0000000000000044 Code: 8b 5d 00 48 8d 7b 58 48 89 f8 48 c1 e8 03 42 80 3c 30 00 0f 85 cc 00 00 00 4c 8b 7b 58 49 8d bf a8 03 00 00 48 89 f8 48 c1 e8 03 <42> 80 3c 30 00 0f 85 a5 00 00 00 48 89 df 41 83 ec 01 49 83 ed RIP: fuse_ctl_remove_conn+0xc8/0x1b0 fs/fuse/control.c:286 RSP: ffff8801b0ee7968 ---[ end trace d64f1dab46c839a5 ]--- --- This bug is generated by a dumb bot. 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