audit: type=1400 audit(1566599687.029:38): avc: denied { write } for pid=6916 comm="syz-executor961" 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(1566599687.029:39): avc: denied { read } for pid=6916 comm="syz-executor961" 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 4.14.139 #35 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-executor961/6916: #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: 0 PID: 6916 Comm: syz-executor961 Not tainted 4.14.139 #35 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:797 __tipc_nl_compat_doit net/tipc/netlink_compat.c:306 [inline] tipc_nl_compat_doit+0x1a2/0x550 net/tipc/netlink_compat.c:354 tipc_nl_compat_handle net/tipc/netlink_compat.c:1198 [inline] tipc_nl_compat_recv+0x9ec/0xb20 net/tipc/netlink_compat.c:1280 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/0x640 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: 0033:0x4449e9 RSP: 002b:00007ffd66d9a5e8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000004a61f0 RCX: 00000000004449e9 RDX: 0000000000000000 RSI: 0000000020000380 RDI: 0000000000000003 RBP: 00000000006cf018 R08: 0000000000000000 R09: 0000000120080522 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402310 R13: 00000000004023a0 R14: 0000000000000000 R15: 0000000000000000