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Subjectnet/core: BUG in unregister_netdevice_many

I've got the following error report while fuzzing the kernel with syzkaller.

On commit 4f7d029b9bf009fbee76bb10c0c4351a1870d2f3 (4.11-rc7).

A reproducer and .config are attached.

------------[ cut here ]------------
kernel BUG at net/core/dev.c:6813!
invalid opcode: 0000 [#1] SMP KASAN
Modules linked in:
CPU: 1 PID: 1165 Comm: kworker/u4:3 Not tainted 4.11.0-rc7+ #251
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
Workqueue: netns cleanup_net
task: ffff880069208000 task.stack: ffff8800692d8000
RIP: 0010:rollback_registered_many+0x348/0xeb0 net/core/dev.c:6813
RSP: 0018:ffff8800692de7f0 EFLAGS: 00010297
RAX: ffff880069208000 RBX: 0000000000000002 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88006af90569
RBP: ffff8800692de9f0 R08: ffff8800692dec60 R09: 0000000000000000
R10: 0000000000000006 R11: 0000000000000000 R12: ffff88006af90070
R13: ffff8800692debf0 R14: dffffc0000000000 R15: ffff88006af90000
FS: 0000000000000000(0000) GS:ffff88006cb00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe7e897d870 CR3: 00000000657e7000 CR4: 00000000000006e0
Call Trace:
unregister_netdevice_many.part.105+0x87/0x440 net/core/dev.c:7881
unregister_netdevice_many+0xc8/0x120 net/core/dev.c:7880
ip6mr_device_event+0x362/0x3f0 net/ipv6/ip6mr.c:1346
notifier_call_chain+0x145/0x2f0 kernel/notifier.c:93
__raw_notifier_call_chain kernel/notifier.c:394
raw_notifier_call_chain+0x2d/0x40 kernel/notifier.c:401
call_netdevice_notifiers_info+0x51/0x90 net/core/dev.c:1647
call_netdevice_notifiers net/core/dev.c:1663
rollback_registered_many+0x919/0xeb0 net/core/dev.c:6841
unregister_netdevice_many.part.105+0x87/0x440 net/core/dev.c:7881
unregister_netdevice_many net/core/dev.c:7880
default_device_exit_batch+0x4fa/0x640 net/core/dev.c:8333
ops_exit_list.isra.4+0x100/0x150 net/core/net_namespace.c:144
cleanup_net+0x5a8/0xb40 net/core/net_namespace.c:463
process_one_work+0xc04/0x1c10 kernel/workqueue.c:2097
worker_thread+0x223/0x19c0 kernel/workqueue.c:2231
kthread+0x35e/0x430 kernel/kthread.c:231
ret_from_fork+0x31/0x40 arch/x86/entry/entry_64.S:430
Code: 3c 32 00 0f 85 70 0b 00 00 48 b8 00 02 00 00 00 00 ad de 49 89
47 78 e9 93 fe ff ff 49 8d 57 70 49 8d 5f 78 eb 9e e8 88 7a 14 fe <0f>
0b 48 8b 9d 28 fe ff ff e8 7a 7a 14 fe 48 b8 00 00 00 00 00
RIP: rollback_registered_many+0x348/0xeb0 RSP: ffff8800692de7f0
---[ end trace e0b29c57e9b3292c ]---
// autogenerated by syzkaller (

#define _GNU_SOURCE

#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>

#include <linux/capability.h>
#include <linux/if.h>
#include <linux/if_tun.h>
#include <linux/kvm.h>
#include <linux/sched.h>
#include <net/if_arp.h>

#include <netinet/in.h>
#include <linux/mroute6.h>

#include <assert.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <pthread.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

void main() {

int s = socket(0xaul, 0x80003ul, 0x3aul);

struct mif6ctl mif6ctl;
mif6ctl.mif6c_mifi = 0x3;
mif6ctl.mif6c_flags = 0x1;
mif6ctl.vifc_threshold = 0x1;
mif6ctl.mif6c_pifi = 0x1; // "lo" interface
mif6ctl.vifc_rate_limit = 0xec;

setsockopt(s, SOL_IPV6, MRT6_ADD_MIF, &mif6ctl, sizeof(mif6ctl));
[unhandled content-type:application/octet-stream]
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