Warning: Permanently added '10.128.0.141' (ECDSA) to the list of known hosts. executing program [ 35.748146] audit: type=1400 audit(1595474229.732:8): avc: denied { execmem } for pid=6371 comm="syz-executor890" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 35.752109] [ 35.770160] ============================= [ 35.774321] WARNING: suspicious RCU usage [ 35.778613] 4.14.189-syzkaller #0 Not tainted [ 35.783097] ----------------------------- [ 35.787341] net/tipc/bearer.c:177 suspicious rcu_dereference_protected() usage! [ 35.794903] [ 35.794903] other info that might help us debug this: [ 35.794903] [ 35.803130] [ 35.803130] rcu_scheduler_active = 2, debug_locks = 1 [ 35.809842] 2 locks held by syz-executor890/6371: [ 35.814673] #0: (cb_lock){++++}, at: [] genl_rcv+0x15/0x40 [ 35.822117] #1: (genl_mutex){+.+.}, at: [] genl_rcv_msg+0x112/0x140 [ 35.830362] [ 35.830362] stack backtrace: [ 35.835484] CPU: 0 PID: 6371 Comm: syz-executor890 Not tainted 4.14.189-syzkaller #0 [ 35.843356] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.852716] Call Trace: [ 35.855302] dump_stack+0x1b2/0x283 [ 35.858934] tipc_bearer_find+0x1ff/0x2f0 [ 35.863238] tipc_nl_compat_link_set+0x40b/0xb90 [ 35.867989] ? __alloc_skb+0x3dc/0x510 [ 35.871856] tipc_nl_compat_doit+0x192/0x5d0 [ 35.876259] ? tipc_nl_compat_link_set+0xb90/0xb90 [ 35.881168] ? security_capable+0x88/0xb0 [ 35.885303] ? ns_capable_common+0x127/0x150 [ 35.889697] tipc_nl_compat_recv+0xa0b/0xae0 [ 35.894082] ? tipc_nl_compat_dumpit+0x530/0x530 [ 35.898828] ? tipc_nl_node_dump+0xc20/0xc20 [ 35.903211] ? __tipc_add_link_prop.isra.0+0x190/0x190 [ 35.908472] ? lock_downgrade+0x740/0x740 [ 35.912633] genl_family_rcv_msg+0x572/0xb20 [ 35.917025] ? __lock_acquire+0x5fc/0x3f20 [ 35.921235] ? genl_rcv+0x40/0x40 [ 35.924680] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 35.930132] ? trace_hardirqs_on+0x10/0x10 [ 35.934346] ? sock_sendmsg+0xb5/0x100 [ 35.938229] genl_rcv_msg+0xaf/0x140 [ 35.941934] netlink_rcv_skb+0x125/0x390 [ 35.945988] ? genl_family_rcv_msg+0xb20/0xb20 [ 35.950556] ? netlink_ack+0x9a0/0x9a0 [ 35.954419] ? lock_acquire+0x170/0x3f0 [ 35.958392] genl_rcv+0x24/0x40 [ 35.961677] netlink_unicast+0x437/0x610 [ 35.965716] ? netlink_sendskb+0xd0/0xd0 [ 35.969770] netlink_sendmsg+0x62e/0xb80 [ 35.973820] ? nlmsg_notify+0x170/0x170 [ 35.977790] ? kernel_recvmsg+0x210/0x210 [ 35.981914] ? security_socket_sendmsg+0x83/0xb0 [ 35.986664] ? nlmsg_notify+0x170/0x170 [ 35.990615] sock_sendmsg+0xb5/0x100 [ 35.994319] ___sys_sendmsg+0x6c8/0x800 [ 35.998276] ? copy_msghdr_from_user+0x3b0/0x3b0 [ 36.003014] ? __lock_acquire+0x5fc/0x3f20 [ 36.007256] ? __dentry_kill+0x3f7/0x550 [ 36.011297] ? trace_hardirqs_on+0x10/0x10 [ 36.015530] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 36.020979] ? dentry_free+0xc6/0x120 [ 36.024759] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 36.029780] ? kmem_cache_free+0x23a/0x2b0 [ 36.034008] ? mntput_no_expire+0xc7/0x910 [ 36.038237] ? lock_acquire+0x170/0x3f0 [ 36.042205] ? __fdget+0x167/0x1f0 [ 36.045726] ? sockfd_lookup_light+0xb2/0x160 [ 36.050211] __sys_sendmsg+0xa3/0x120 [ 36.053990] ? SyS_shutdown+0x160/0x160 [ 36.057962] SyS_sendmsg+0x27/0x40 [ 36.061480] ? __sys_sendmsg+0x120/0x120 [ 36.065543] do_syscall_64+0x1d5/0x640 [ 36.069418] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 36.074585] RIP: 0033:0x4442f9 [ 36.077771] RSP: 002b:00007fff082b78a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 36.085481] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 00000000004442f9 [ 36.092734] RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000003