audit: type=1400 audit(1563905293.039:38): avc: denied { write } for pid=6983 comm="syz-executor251" 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(1563905293.039:39): avc: denied { read } for pid=6983 comm="syz-executor251" 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 WARNING: suspicious RCU usage 4.14.134 #29 Not tainted ----------------------------- net/tipc/bearer.c:177 suspicious rcu_dereference_protected() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 2 locks held by syz-executor251/6983: #0: (cb_lock){++++}, at: [] genl_rcv+0x1a/0x40 /net/netlink/genetlink.c:635 #1: (genl_mutex){+.+.}, at: [] genl_lock /net/netlink/genetlink.c:33 [inline] #1: (genl_mutex){+.+.}, at: [] genl_rcv_msg+0x119/0x150 /net/netlink/genetlink.c:623 stack backtrace: CPU: 1 PID: 6983 Comm: syz-executor251 Not tainted 4.14.134 #29 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+0x138/0x19c /lib/dump_stack.c:53 lockdep_rcu_suspicious+0x153/0x15d /kernel/locking/lockdep.c:4662 tipc_bearer_find+0x20a/0x300 /net/tipc/bearer.c:177 tipc_nl_compat_link_set+0x433/0xbf0 /net/tipc/netlink_compat.c:794 __tipc_nl_compat_doit /net/tipc/netlink_compat.c:304 [inline] tipc_nl_compat_doit+0x16b/0x510 /net/tipc/netlink_compat.c:351 tipc_nl_compat_handle /net/tipc/netlink_compat.c:1195 [inline] tipc_nl_compat_recv+0x9b8/0xaf0 /net/tipc/netlink_compat.c:1277 genl_family_rcv_msg+0x614/0xc30 /net/netlink/genetlink.c:600 genl_rcv_msg+0xb4/0x150 /net/netlink/genetlink.c:625 netlink_rcv_skb+0x14f/0x3c0 /net/netlink/af_netlink.c:2432 genl_rcv+0x29/0x40 /net/netlink/genetlink.c:636 netlink_unicast_kernel /net/netlink/af_netlink.c:1286 [inline] netlink_unicast+0x45d/0x780 /net/netlink/af_netlink.c:1312 netlink_sendmsg+0x7c4/0xc60 /net/netlink/af_netlink.c:1877 sock_sendmsg_nosec /net/socket.c:646 [inline] sock_sendmsg+0xce/0x110 /net/socket.c:656 ___sys_sendmsg+0x70a/0x840 /net/socket.c:2062 __sys_sendmsg+0xb9/0x140 /net/socket.c:2096 SYSC_sendmsg /net/socket.c:2107 [inline] SyS_sendmsg+0x2d/0x50 /net/socket.c:2103 do_syscall_64+0x1e8/0x640 /arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x444229 RSP: 002b:00007ffd0830f698 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000444229 RDX: 0000000000000000 RSI: 0000000020000380 RDI: 0000000000000003 RBP: 00000000006ce018 R08: