Message-ID: <CADvbK_ctXVom8WDMZ1kRURSFfGZ_wJFtWrJdrnpgpg3=7_7nUg@mail.gmail.com>
Date:   Tue, 13 Mar 2018 18:44:35 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     syzbot <syzbot+e56a5d45f832ef33ad2f@...kaller.appspotmail.com>
Cc:     davem <davem@...emloft.net>, LKML <linux-kernel@...r.kernel.org>,
        linux-sctp@...r.kernel.org, network dev <netdev@...r.kernel.org>,
        Neil Horman <nhorman@...driver.com>,
        syzkaller-bugs@...glegroups.com,
        Vlad Yasevich <vyasevich@...il.com>
Subject: Re: BUG: corrupted list in sctp_association_free

On Tue, Mar 13, 2018 at 3:34 PM, syzbot
<syzbot+e56a5d45f832ef33ad2f@...kaller.appspotmail.com> wrote:
> Hello,
>
> syzbot hit the following crash on net-next commit
> fd372a7a9e5e9d8011a0222d10edd3523abcd3b1 (Thu Mar 8 19:43:48 2018 +0000)
> Merge tag 'mlx5-updates-2018-02-28-2' of
> git://git.kernel.org/pub/scm/linux/kernel/git/mellanox/linux
>
> Unfortunately, I don't have any reproducer for this crash yet.
> Raw console output is attached.
> compiler: gcc (GCC) 7.1.1 20170620
> .config is attached.
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+e56a5d45f832ef33ad2f@...kaller.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.
>
> selinux_nlmsg_perm: 1 callbacks suppressed
> SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0
> sclass=netlink_route_socket pig=12502 comm=syz-executor3
> SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0
> sclass=netlink_route_socket pig=12528 comm=syz-executor3
> list_del corruption, 00000000fcc5fb27->next is LIST_POISON1
> (00000000cb16e51d)
> ------------[ cut here ]------------
> kernel BUG at lib/list_debug.c:47!
> invalid opcode: 0000 [#1] SMP KASAN
> Dumping ftrace buffer:
>    (ftrace buffer empty)
> Modules linked in:
> CPU: 0 PID: 12537 Comm: syz-executor2 Not tainted 4.16.0-rc4+ #258
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> RIP: 0010:__list_del_entry_valid+0xd3/0x150 lib/list_debug.c:45
> RSP: 0018:ffff8801b6387778 EFLAGS: 00010286
> RAX: 000000000000004e RBX: dead000000000200 RCX: 0000000000000000
> RDX: 000000000000004e RSI: ffffc90002ed6000 RDI: ffffed0036c70ee3
> RBP: ffff8801b6387790 R08: 1ffff10036c70e3b R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000000 R12: dead000000000100
> R13: ffff8801d3164000 R14: ffff8801d8502220 R15: ffff8801b6387c58
> FS:  00007ff42042f700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007ff42040ddb8 CR3: 00000001bd840003 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]
>  list_del include/linux/list.h:125 [inline]
>  sctp_association_free+0x133/0x930 net/sctp/associola.c:341
>  sctp_sendmsg+0xc67/0x1a80 net/sctp/socket.c:2075
>  inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:763
>  sock_sendmsg_nosec net/socket.c:629 [inline]
>  sock_sendmsg+0xca/0x110 net/socket.c:639
>  SYSC_sendto+0x361/0x5c0 net/socket.c:1748
>  SyS_sendto+0x40/0x50 net/socket.c:1716
>  do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
>  entry_SYSCALL_64_after_hwframe+0x42/0xb7
> RIP: 0033:0x453e69
> RSP: 002b:00007ff42042ec68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
> RAX: ffffffffffffffda RBX: 00007ff42042f6d4 RCX: 0000000000453e69
> RDX: 0000000000000001 RSI: 0000000020000340 RDI: 0000000000000015
> RBP: 000000000072c0c8 R08: 00000000204d9000 R09: 000000000000001c
> R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
> R13: 00000000000004cd R14: 00000000006f73d8 R15: 0000000000000003
> Code: 8f 00 00 00 49 8b 54 24 08 48 39 f2 75 3b 48 83 c4 08 b8 01 00 00 00
> 5b 41 5c 5d c3 4c 89 e2 48 c7 c7 c0 7c 40 86 e8 75 f6 fb fe <0f> 0b 48 c7 c7
> 20 7d 40 86 e8 67 f6 fb fe 0f 0b 48 c7 c7 80 7d
> RIP: __list_del_entry_valid+0xd3/0x150 lib/list_debug.c:45 RSP:
> ffff8801b6387778
> ---[ end trace a6b157f61f9bd43a ]---
> 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@...glegroups.com.
>
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I'd think the patch Neil just posted would fix it.

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