=============================== [ INFO: suspicious RCU usage. ] 4.4.169+ #2 Not tainted ------------------------------- net/ipv4/xfrm4_protocol.c:80 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 1, debug_locks = 0 no locks held by syz-executor0/19106. stack backtrace: CPU: 1 PID: 19106 Comm: syz-executor0 Not tainted 4.4.169+ #2 0000000000000000 dc36a30c89cb7396[ 432.315457] audit: type=1400 audit(1547093455.391:480): avc: denied { ioctl } for pid=19094 comm="syz-executor4" path="socket:[64013]" dev="sockfs" ino=64013 ioctlcmd=5828 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 audit: type=1400 audit(1547093455.391:481): avc: denied { setopt } for pid=19094 comm="syz-executor4" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 audit: type=1400 audit(1547093455.391:482): avc: denied { create } for pid=19094 comm="syz-executor4" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 audit: type=1400 audit(1547093455.391:483): avc: denied { setopt } for pid=19094 comm="syz-executor4" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 audit: type=1400 audit(1547093455.391:484): avc: denied { ioctl } for pid=19094 comm="syz-executor4" path="socket:[64019]" dev="sockfs" ino=64019 ioctlcmd=5828 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 audit: type=1400 audit(1547093455.391:485): avc: denied { setopt } for pid=19094 comm="syz-executor4" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 ffff8801c1cc76f8 ffffffff81aab9c1 ffffffff831ae560 0000000000000000 0000000000000001 0000000000000050 ffff8801d76617c0 ffff8801c1cc7728 ffffffff813ab5f0 ffff8801d7fcf280 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [] lockdep_rcu_suspicious.cold+0x10a/0x149 kernel/locking/lockdep.c:4305 [] xfrm4_rcv_encap+0x30a/0x370 net/ipv4/xfrm4_protocol.c:80 [] xfrm4_udp_encap_rcv+0x3f5/0x620 net/ipv4/xfrm4_input.c:148 [] udp_queue_rcv_skb+0xe57/0x14e0 net/ipv4/udp.c:1547 [] sk_backlog_rcv include/net/sock.h:871 [inline] [] __release_sock net/core/sock.c:2023 [inline] [] release_sock+0x170/0x500 net/core/sock.c:2473 [] udp_sendmsg+0x1176/0x1c60 net/ipv4/udp.c:1107 [] inet_sendmsg+0x202/0x4d0 net/ipv4/af_inet.c:755 [] sock_sendmsg_nosec net/socket.c:638 [inline] [] sock_sendmsg+0xbe/0x110 net/socket.c:648 [] ___sys_sendmsg+0x769/0x890 net/socket.c:1975 [] __sys_sendmsg+0xc5/0x160 net/socket.c:2009 [] C_SYSC_sendmsg net/compat.c:722 [inline] [] compat_SyS_sendmsg+0x2a/0x40 net/compat.c:720 [] do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline] [] do_fast_syscall_32+0x32d/0xa90 arch/x86/entry/common.c:397 [] sysenter_flags_fixed+0xd/0x1a