linux-kernel - Re: WARNING in xfrm6_tunnel_net

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Message-ID: <00000000000020e574056c8e4cf2@google.com>
Date:   Sat, 19 May 2018 05:35:01 -0700
From:   syzbot <syzbot+e9aebef558e3ed673934@...kaller.appspotmail.com>
To:     davem@...emloft.net, herbert@...dor.apana.org.au,
        kuznet@....inr.ac.ru, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, steffen.klassert@...unet.com,
        syzkaller-bugs@...glegroups.com, yoshfuji@...ux-ipv6.org
Subject: Re: WARNING in xfrm6_tunnel_net_exit (2)

syzbot has found a reproducer for the following crash on:

HEAD commit:    eb38401c779d net: stmmac: Populate missing callbacks in HW..
git tree:       net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1233a827800000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b632d8e2c2ab2c1
dashboard link: https://syzkaller.appspot.com/bug?extid=e9aebef558e3ed673934
compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=1547dbcf800000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=132307cf800000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+e9aebef558e3ed673934@...kaller.appspotmail.com

random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
IPVS: ftp: loaded support on port[0] = 21
WARNING: CPU: 1 PID: 44 at net/ipv6/xfrm6_tunnel.c:348  
xfrm6_tunnel_net_exit+0x2df/0x510 net/ipv6/xfrm6_tunnel.c:348
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 44 Comm: kworker/u4:2 Not tainted 4.17.0-rc4+ #52
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Workqueue: netns cleanup_net
Call Trace:
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0x1b9/0x294 lib/dump_stack.c:113
  panic+0x22f/0x4de kernel/panic.c:184
  __warn.cold.8+0x163/0x1b3 kernel/panic.c:536
  report_bug+0x252/0x2d0 lib/bug.c:186
  fixup_bug arch/x86/kernel/traps.c:178 [inline]
  do_error_trap+0x1de/0x490 arch/x86/kernel/traps.c:296
  do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
  invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
RIP: 0010:xfrm6_tunnel_net_exit+0x2df/0x510 net/ipv6/xfrm6_tunnel.c:348
RSP: 0018:ffff8801d95273d8 EFLAGS: 00010293
RAX: ffff8801d955c380 RBX: ffff8801b03399f8 RCX: ffffffff86925525
RDX: 0000000000000000 RSI: ffffffff8692552f RDI: 0000000000000007
RBP: ffff8801d95274f8 R08: ffff8801d955c380 R09: 0000000000000006
R10: ffff8801d955c380 R11: 0000000000000000 R12: 00000000000000ff
R13: ffffed003b2a4e82 R14: ffff8801d95274d0 R15: ffff8801b3e25780
  ops_exit_list.isra.7+0xb0/0x160 net/core/net_namespace.c:152
  cleanup_net+0x51d/0xb20 net/core/net_namespace.c:523
  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
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..