in_atomic(): 1, irqs_disabled(): 0, pid: 3511, name: syzkaller699387
2 locks held by syzkaller699387/3511:
 #0:  (&net->xfrm.xfrm_cfg_mutex){+.+.+.}, at: [<ffffffff83596861>] pfkey_sendmsg+0x3a1/0x750 net/key/af_key.c:3635
 #1:  (&(&net->xfrm.xfrm_policy_lock)->rlock){+...+.}, at: [<ffffffff833df510>] spin_lock_bh include/linux/spinlock.h:307 [inline]
 #1:  (&(&net->xfrm.xfrm_policy_lock)->rlock){+...+.}, at: [<ffffffff833df510>] xfrm_policy_walk+0xb0/0x4d0 net/xfrm/xfrm_policy.c:1033
Preemption disabled at:[   42.910428] [<ffffffff833df510>] spin_lock_bh include/linux/spinlock.h:307 [inline]
Preemption disabled at:[   42.910428] [<ffffffff833df510>] xfrm_policy_walk+0xb0/0x4d0 net/xfrm/xfrm_policy.c:1033
CPU: 0 PID: 3511 Comm: syzkaller699387 Not tainted 4.9.39-g72a0c9f #6
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801cb13f6c0 ffffffff81eacd59 ffffffff833df510 0000000000000000
 0000000000000201 ffff8801cb12af00 ffff8801cb12af00 ffff8801cb13f6f8
 ffffffff811babe4 ffff8801cb12af00 ffffffff84175d81 0000000000000189
Call Trace:
 [<ffffffff81eacd59>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eacd59>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff811babe4>] ___might_sleep+0x2f4/0x470 kernel/sched/core.c:8018
 [<ffffffff811badf5>] __might_sleep+0x95/0x1a0 kernel/sched/core.c:7975
 [<ffffffff81541a11>] slab_pre_alloc_hook mm/slab.h:393 [inline]
 [<ffffffff81541a11>] slab_alloc_node mm/slub.c:2641 [inline]
 [<ffffffff81541a11>] slab_alloc mm/slub.c:2723 [inline]
 [<ffffffff81541a11>] kmem_cache_alloc+0x151/0x2a0 mm/slub.c:2728
 [<ffffffff82f1d842>] skb_clone+0x142/0x2c0 net/core/skbuff.c:1032
 [<ffffffff8358a6d7>] pfkey_broadcast_one+0x367/0x480 net/key/af_key.c:202
 [<ffffffff83591d2a>] pfkey_broadcast+0x3ba/0x5f0 net/key/af_key.c:276
 [<ffffffff83595ba4>] dump_sp+0x354/0x450 net/key/af_key.c:2672
 [<ffffffff833df611>] xfrm_policy_walk+0x1b1/0x4d0 net/xfrm/xfrm_policy.c:1047
 [<ffffffff8358a832>] pfkey_dump_sp+0x42/0x50 net/key/af_key.c:2682
 [<ffffffff83593a60>] pfkey_do_dump+0x40/0x2b0 net/key/af_key.c:288
 [<ffffffff83593e57>] pfkey_spddump+0x187/0x1e0 net/key/af_key.c:2705
 [<ffffffff83595006>] pfkey_process+0x606/0x710 net/key/af_key.c:2795
 [<ffffffff8359686f>] pfkey_sendmsg+0x3af/0x750 net/key/af_key.c:3636
 [<ffffffff82efba2a>] sock_sendmsg_nosec net/socket.c:635 [inline]
 [<ffffffff82efba2a>] sock_sendmsg+0xca/0x110 net/socket.c:645
 [<ffffffff82efbc8d>] sock_write_iter+0x21d/0x3a0 net/socket.c:843
 [<ffffffff8157311c>] new_sync_write fs/read_write.c:499 [inline]
 [<ffffffff8157311c>] __vfs_write+0x4ac/0x660 fs/read_write.c:512
 [<ffffffff81576df0>] vfs_write+0x170/0x4e0 fs/read_write.c:560
 [<ffffffff8157a724>] SYSC_write fs/read_write.c:607 [inline]
 [<ffffffff8157a724>] SyS_write+0xd4/0x1a0 fs/read_write.c:599
 [<ffffffff83965985>] entry_SYSCALL_64_fastpath+0x23/0xc6