WARNING in xfrm_policy_fini

[syzbot]

Hello,

syzbot hit the following crash on upstream commit
3eb2ce825ea1ad89d20f7a3b5780df850e4be274 (Sun Mar 25 22:44:30 2018 +0000)
Linux 4.16-rc7
syzbot dashboard link:
https://syzkaller.appspot.com/bug?extid=14c83f69c604fc8f5d15

Unfortunately, I don't have any reproducer for this crash yet.
Raw console output:
https://syzkaller.appspot.com/x/log.txt?id=4840705629356032
Kernel config:
https://syzkaller.appspot.com/x/.config?id=-8440362230543204781
compiler: gcc (GCC) 7.1.1 20170620
CC: [da...@davemloft.net her...@gondor.apana.org.au
linux-...@vger.kernel.org net...@vger.kernel.org
steffen....@secunet.com]

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+14c83f...@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.

bond0 (unregistering): Released all slaves
WARNING: CPU: 1 PID: 7312 at net/xfrm/xfrm_policy.c:2925
xfrm_policy_fini+0x414/0x560 net/xfrm/xfrm_policy.c:2925
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 7312 Comm: kworker/u4:7 Not tainted 4.16.0-rc7+ #3
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:17 [inline]
dump_stack+0x194/0x24d lib/dump_stack.c:53
panic+0x1e4/0x41c kernel/panic.c:183
__warn+0x1dc/0x200 kernel/panic.c:547
report_bug+0x1f4/0x2b0 lib/bug.c:186
fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
fixup_bug arch/x86/kernel/traps.c:247 [inline]
do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:986
RIP: 0010:xfrm_policy_fini+0x414/0x560 net/xfrm/xfrm_policy.c:2925
RSP: 0018:ffff8801b25d70d8 EFLAGS: 00010293
RAX: ffff8801b129c540 RBX: ffff8801b5608200 RCX: ffffffff8587ff74
RDX: 0000000000000000 RSI: 1ffff100362539c5 RDI: ffffffff87acabf8
RBP: ffff8801b25d7260 R08: 1ffff100364badd1 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff100364bae27
R13: ffff8801b25d7238 R14: ffff8801b56096f0 R15: ffff8801d71c5820
xfrm_net_exit+0x1d/0x70 net/xfrm/xfrm_policy.c:2980
ops_exit_list.isra.6+0xae/0x150 net/core/net_namespace.c:142
cleanup_net+0x6a1/0xcb0 net/core/net_namespace.c:517
process_one_work+0xc47/0x1bb0 kernel/workqueue.c:2113
worker_thread+0x223/0x1990 kernel/workqueue.c:2247
kthread+0x33c/0x400 kernel/kthread.c:238
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406
Dumping ftrace buffer:
(ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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[Dmitry Vyukov]

#syz upstream

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