[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 [ 31.907572] random: sshd: uninitialized urandom read (32 bytes read) syzkaller login: [ 32.199618] kauditd_printk_skb: 10 callbacks suppressed [ 32.199626] audit: type=1400 audit(1572028537.155:35): avc: denied { map } for pid=6901 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 [ 32.255258] random: sshd: uninitialized urandom read (32 bytes read) [ 32.842675] random: sshd: uninitialized urandom read (32 bytes read) [ 33.023241] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.237' (ECDSA) to the list of known hosts. [ 38.631554] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 38.757826] audit: type=1400 audit(1572028543.715:36): avc: denied { map } for pid=6914 comm="syz-executor778" path="/root/syz-executor778975102" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 38.763990] [ 38.784939] audit: type=1400 audit(1572028543.715:37): avc: denied { create } for pid=6914 comm="syz-executor778" 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 [ 38.785911] ============================= [ 38.809976] audit: type=1400 audit(1572028543.715:38): avc: denied { write } for pid=6914 comm="syz-executor778" 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 [ 38.809993] audit: type=1400 audit(1572028543.715:39): avc: denied { read } for pid=6914 comm="syz-executor778" 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 [ 38.862541] WARNING: suspicious RCU usage [ 38.866707] 4.14.150 #0 Not tainted [ 38.870388] ----------------------------- [ 38.874538] net/tipc/bearer.c:177 suspicious rcu_dereference_protected() usage! [ 38.882159] [ 38.882159] other info that might help us debug this: [ 38.882159] [ 38.890412] [ 38.890412] rcu_scheduler_active = 2, debug_locks = 1 [ 38.897062] 2 locks held by syz-executor778/6914: [ 38.901992] #0: (cb_lock){++++}, at: [] genl_rcv+0x1a/0x40 [ 38.909538] #1: (genl_mutex){+.+.}, at: [] genl_rcv_msg+0x119/0x150 [ 38.917854] [ 38.917854] stack backtrace: [ 38.922407] CPU: 1 PID: 6914 Comm: syz-executor778 Not tainted 4.14.150 #0 [ 38.929413] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.938756] Call Trace: [ 38.941558] dump_stack+0x138/0x197 [ 38.945171] lockdep_rcu_suspicious+0x153/0x15d [ 38.949828] tipc_bearer_find+0x20a/0x300 [ 38.953958] tipc_nl_compat_link_set+0x433/0xbf0 [ 38.958689] tipc_nl_compat_doit+0x1a2/0x550 [ 38.963076] ? security_capable+0x8e/0xc0 [ 38.967205] ? tipc_nl_compat_link_stat_dump+0x2080/0x2080 [ 38.972843] ? ns_capable_common+0x12c/0x160 [ 38.977241] ? ns_capable+0x23/0x30 [ 38.980850] ? __netlink_ns_capable+0xe2/0x130 [ 38.985424] tipc_nl_compat_recv+0x9ec/0xb20 [ 38.989808] ? is_bpf_text_address+0xa6/0x120 [ 38.994298] ? tipc_nl_compat_doit+0x550/0x550 [ 38.998857] ? tipc_nl_node_dump+0xc90/0xc90 [ 39.003247] ? tipc_nl_compat_bearer_enable+0x570/0x570 [ 39.008592] ? lock_acquire+0x16f/0x430 [ 39.012567] ? genl_rcv_msg+0x119/0x150 [ 39.016519] ? genl_rcv_msg+0x119/0x150 [ 39.020471] genl_family_rcv_msg+0x614/0xc30 [ 39.024861] ? genl_unregister_family+0x6a0/0x6a0 [ 39.029718] genl_rcv_msg+0xb4/0x150 [ 39.033451] netlink_rcv_skb+0x14f/0x3c0 [ 39.037536] ? genl_family_rcv_msg+0xc30/0xc30 [ 39.042118] ? netlink_ack+0x9a0/0x9a0 [ 39.046016] ? genl_rcv+0x1a/0x40 [ 39.049649] genl_rcv+0x29/0x40 [ 39.052926] netlink_unicast+0x45d/0x640 [ 39.056969] ? netlink_attachskb+0x6a0/0x6a0 [ 39.061361] ? security_netlink_send+0x81/0xb0 [ 39.065923] netlink_sendmsg+0x7c4/0xc60 [ 39.069963] ? netlink_unicast+0x640/0x640 [ 39.074526] ? security_socket_sendmsg+0x89/0xb0 [ 39.079260] ? netlink_unicast+0x640/0x640 [ 39.083478] sock_sendmsg+0xce/0x110 [ 39.087171] ___sys_sendmsg+0x70a/0x840 [ 39.091128] ? copy_msghdr_from_user+0x3f0/0x3f0 [ 39.095869] ? __lock_acquire+0x5f7/0x4620 [ 39.100105] ? save_trace+0x290/0x290 [ 39.103890] ? trace_hardirqs_on+0x10/0x10 [ 39.108108] ? save_trace+0x290/0x290 [ 39.111886] ? lock_downgrade+0x740/0x740 [ 39.116014] ? task_work_run+0xf0/0x190 [ 39.119973] ? __fget_light+0x172/0x1f0 [ 39.123949] ? __fdget+0x1b/0x20 [ 39.127318] ? sockfd_lookup_light+0xb4/0x160 [ 39.131812] __sys_sendmsg+0xb9/0x140 [ 39.135621] ? SyS_shutdown+0x170/0x170 [ 39.139628] ? trace_hardirqs_on_caller+0x400/0x590 [ 39.144841] SyS_sendmsg+0x2d/0x50 [ 39.148370] ? __sys_sendmsg+0x140/0x140 [ 39.152422] do_syscall_64+0x1e8/0x640 [ 39.156324] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.161152] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 39.166332] RIP: 0033:0x444149 [ 39.169502] RSP: 002b:00007ffe3b916908 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 39.177215] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000444149 [ 39.184551] RDX: 0000000000000000 RSI: 00000000200002c0 RDI: 0000000000000003 [ 39.191801] RBP: 00000000006ce018 R08: 0000000000000000 R09: 00000000004002e0 [ 39.199069] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401df0 [ 39.206408] R13: 0000000000401e80 R14: 0