From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-it0-f71.google.com ([209.85.214.71]:53506 "EHLO mail-it0-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752256AbeCaXBC (ORCPT ); Sat, 31 Mar 2018 19:01:02 -0400 Received: by mail-it0-f71.google.com with SMTP id i205-v6so10778937ita.3 for ; Sat, 31 Mar 2018 16:01:02 -0700 (PDT) MIME-Version: 1.0 Date: Sat, 31 Mar 2018 16:01:02 -0700 Message-ID: <001a11447acaa9eec40568bd5438@google.com> Subject: BUG: corrupted list in __dentry_kill 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 hit the following crash on bpf-next commit 7828f20e3779e4e85e55371e0e43f5006a15fb41 (Sat Mar 31 00:17:57 2018 +0000) Merge branch 'bpf-cgroup-bind-connect' syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=f3bd89a5ab3266b10540 So far this crash happened 22 times on bpf-next, upstream. C reproducer: https://syzkaller.appspot.com/x/repro.c?id=6290970458980352 syzkaller reproducer: https://syzkaller.appspot.com/x/repro.syz?id=6577156880596992 Raw console output: https://syzkaller.appspot.com/x/log.txt?id=5107570603720704 Kernel config: https://syzkaller.appspot.com/x/.config?id=5909223872832634926 compiler: gcc (GCC) 7.1.1 20170620 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+f3bd89a5ab3266b10540@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: 00007ffd1bbb3ae0 R08: 0000000020000200 R09: 0000000300000000 R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff R13: 0000000000000003 R14: 0000000000001380 R15: 00007ffd1bbb3378 list_del corruption. prev->next should be 00000000a8104008, but was 00000000081c6144 ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:53! invalid opcode: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 4448 Comm: syzkaller853443 Not tainted 4.16.0-rc6+ #43 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__list_del_entry_valid+0xef/0x150 lib/list_debug.c:51 RSP: 0018:ffff8801b8f977a0 EFLAGS: 00010282 RAX: 0000000000000054 RBX: ffff8801b0c1cf60 RCX: 0000000000000000 RDX: 0000000000000054 RSI: 1ffff100371f2ea9 RDI: ffffed00371f2ee8 RBP: ffff8801b8f977b8 R08: 1ffff100371f2e40 R09: 0000000000000000 R10: ffff8801b8f97778 R11: 0000000000000000 R12: ffff8801b0c1cde0 R13: 1ffff100371f2efd R14: ffff8801b0c1cc70 R15: dffffc0000000000 FS: 00000000023a5880(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000004b6fbc CR3: 00000001c85a6004 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_del_entry include/linux/list.h:117 [inline] dentry_unlist fs/dcache.c:518 [inline] __dentry_kill+0x260/0x700 fs/dcache.c:571 dentry_kill fs/dcache.c:616 [inline] dput.part.20+0x5a0/0x830 fs/dcache.c:831 dput+0x1f/0x30 fs/dcache.c:795 rpc_gssd_dummy_depopulate net/sunrpc/rpc_pipe.c:1381 [inline] rpc_fill_super+0x628/0xae0 net/sunrpc/rpc_pipe.c:1426 mount_ns+0xc4/0x190 fs/super.c:1036 rpc_mount+0x9e/0xd0 net/sunrpc/rpc_pipe.c:1451 mount_fs+0x66/0x2d0 fs/super.c:1222 vfs_kern_mount.part.26+0xc6/0x4a0 fs/namespace.c:1037 vfs_kern_mount fs/namespace.c:2509 [inline] do_new_mount fs/namespace.c:2512 [inline] do_mount+0xea4/0x2bb0 fs/namespace.c:2842 SYSC_mount fs/namespace.c:3058 [inline] SyS_mount+0xab/0x120 fs/namespace.c:3035 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x442759 RSP: 002b:00007ffd1bbb3238 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442759 RDX: 00000000200002c0 RSI: 0000000020000140 RDI: 0000000020000300 RBP: 00007ffd1bbb3ae0 R08: 0000000020000200 R09: 0000000300000000 R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff R13: 0000000000000003 R14: 0000000000001380 R15: 00007ffd1bbb3378 Code: 4c 89 e2 48 c7 c7 c0 bf 75 87 e8 35 c1 46 fe 0f 0b 48 c7 c7 20 c0 75 87 e8 27 c1 46 fe 0f 0b 48 c7 c7 80 c0 75 87 e8 19 c1 46 fe <0f> 0b 48 c7 c7 e0 c0 75 87 e8 0b c1 46 fe 0f 0b 48 89 df 48 89 RIP: __list_del_entry_valid+0xef/0x150 lib/list_debug.c:51 RSP: ffff8801b8f977a0 ---[ end trace e1b9954cded9aca7 ]--- --- 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. syzbot will keep track of this bug report. If you forgot to add the Reported-by tag, once the fix for this bug is merged into any tree, please reply to this email with: #syz fix: exact-commit-title If you want to test a patch for this bug, please reply with: #syz test: git://repo/address.git branch and provide the patch inline or as an attachment. To mark this as a duplicate of another syzbot report, please reply with: #syz dup: exact-subject-of-another-report If it's a one-off invalid bug report, please reply with: #syz invalid Note: if the crash happens again, it will cause creation of a new bug report. Note: all commands must start from beginning of the line in the email body.