SELinux: unrecognized netlink message: protocol=4 nlmsg_type=24 sclass=netlink_tcpdiag_socket pig=26846 comm=syz-executor2
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BUG: KASAN: slab-out-of-bounds in erspan_xmit+0x22d4/0x2430 net/ipv4/ip_gre.c:735
Read of size 2 at addr ffff8801c8ee3acb by task syz-executor6/26862

CPU: 0 PID: 26862 Comm: syz-executor6 Not tainted 4.15.0-rc8+ #204
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x25b/0x340 mm/kasan/report.c:409
 __asan_report_load_n_noabort+0xf/0x20 mm/kasan/report.c:440
 erspan_xmit+0x22d4/0x2430 net/ipv4/ip_gre.c:735
 __netdev_start_xmit include/linux/netdevice.h:4055 [inline]
 netdev_start_xmit include/linux/netdevice.h:4064 [inline]
 packet_direct_xmit+0x3ad/0x790 net/packet/af_packet.c:267
 packet_snd net/packet/af_packet.c:2944 [inline]
 packet_sendmsg+0x3aed/0x60b0 net/packet/af_packet.c:2969
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:640
 SYSC_sendto+0x361/0x5c0 net/socket.c:1721
 SyS_sendto+0x40/0x50 net/socket.c:1689
 entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x452ef9
RSP: 002b:00007fbfd9a79c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ef9
RDX: 0000000000000000 RSI: 0000000020011000 RDI: 0000000000000013
RBP: 000000000000059c R08: 0000000020008000 R09: 000000000000001c
R10: 0000000000004000 R11: 0000000000000212 R12: 00000000006f7740
R13: 00000000ffffffff R14: 00007fbfd9a7a6d4 R15: 0000000000000000

Allocated by task 3708:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489
 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3544
 anon_vma_chain_alloc mm/rmap.c:128 [inline]
 anon_vma_clone+0x139/0x700 mm/rmap.c:268
 anon_vma_fork+0xe4/0x870 mm/rmap.c:331
 dup_mmap kernel/fork.c:670 [inline]
 dup_mm kernel/fork.c:1196 [inline]
 copy_mm+0xb4d/0x131b kernel/fork.c:1250
 copy_process.part.38+0x1ee9/0x4b20 kernel/fork.c:1752
 copy_process kernel/fork.c:1565 [inline]
 _do_fork+0x1f7/0xfe0 kernel/fork.c:2044
 SYSC_clone kernel/fork.c:2154 [inline]
 SyS_clone+0x37/0x50 kernel/fork.c:2148
 do_syscall_64+0x273/0x920 arch/x86/entry/common.c:285
 return_from_SYSCALL_64+0x0/0x75

Freed by task 12987:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3488 [inline]
 kmem_cache_free+0x83/0x2a0 mm/slab.c:3746
 anon_vma_chain_free mm/rmap.c:133 [inline]
 unlink_anon_vmas+0x20d/0x9f0 mm/rmap.c:400
 free_pgtables+0x21e/0x330 mm/memory.c:635
 exit_mmap+0x291/0x500 mm/mmap.c:3039
 __mmput kernel/fork.c:923 [inline]
 mmput+0x223/0x6d0 kernel/fork.c:944
 exit_mm kernel/exit.c:544 [inline]
 do_exit+0x90a/0x1ad0 kernel/exit.c:852
 do_group_exit+0x149/0x400 kernel/exit.c:968
 get_signal+0x73f/0x16c0 kernel/signal.c:2335
 do_signal+0x90/0x1eb0 arch/x86/kernel/signal.c:809
 exit_to_usermode_loop+0x214/0x310 arch/x86/entry/common.c:158
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
 entry_SYSCALL_64_fastpath+0x9e/0xa0

The buggy address belongs to the object at ffff8801c8ee3a80
 which belongs to the cache anon_vma_chain of size 64
The buggy address is located 11 bytes to the right of
 64-byte region [ffff8801c8ee3a80, ffff8801c8ee3ac0)
The buggy address belongs to the page:
page:ffffea000723b8c0 count:1 mapcount:0 mapping:ffff8801c8ee3000 index:0xffff8801c8ee3c00
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801c8ee3000 ffff8801c8ee3c00 0000000100000014
raw: ffffea000742ad60 ffffea00073e4de0 ffff8801dad30500 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c8ee3980: fb fb fb fb fc fc fc fc fb fb fb fb fb fb fb fb
 ffff8801c8ee3a00: fc fc fc fc fb fb fb fb fb fb fb fb fc fc fc fc
>ffff8801c8ee3a80: fb fb fb fb fb fb fb fb fc fc fc fc fb fb fb fb
                                              ^
 ffff8801c8ee3b00: fb fb fb fb fc fc fc fc fb fb fb fb fb fb fb fb
 ffff8801c8ee3b80: fc fc fc fc fb fb fb fb fb fb fb fb fc fc fc fc
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