[....] Starting enhanced syslogd: rsyslogd[ 17.583678] audit: type=1400 audit(1518206427.072:5): avc: denied { syslog } for pid=4022 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 [?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.389057] audit: type=1400 audit(1518206432.877:6): avc: denied { map } for pid=4161 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 Warning: Permanently added '10.128.0.39' (ECDSA) to the list of known hosts. executing program [ 29.803582] audit: type=1400 audit(1518206439.292:7): avc: denied { map } for pid=4175 comm="syzkaller894960" path="/root/syzkaller894960638" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 29.806390] [ 29.829538] audit: type=1400 audit(1518206439.292:8): avc: denied { create } for pid=4175 comm="syzkaller894960" 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 [ 29.831265] ============================= [ 29.856127] audit: type=1400 audit(1518206439.292:9): avc: denied { write } for pid=4175 comm="syzkaller894960" 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 [ 29.860273] WARNING: suspicious RCU usage [ 29.860281] 4.15.0+ #306 Not tainted [ 29.891883] ----------------------------- [ 29.896255] net/tipc/bearer.c:177 suspicious rcu_dereference_protected() usage! [ 29.903755] [ 29.903755] other info that might help us debug this: [ 29.903755] [ 29.912090] [ 29.912090] rcu_scheduler_active = 2, debug_locks = 1 [ 29.918765] 2 locks held by syzkaller894960/4175: [ 29.923608] #0: (cb_lock){++++}, at: [<0000000094bc708e>] genl_rcv+0x19/0x40 [ 29.931036] #1: (genl_mutex){+.+.}, at: [<0000000062f28266>] genl_rcv_msg+0x115/0x140 [ 29.939209] [ 29.939209] stack backtrace: [ 29.943712] CPU: 0 PID: 4175 Comm: syzkaller894960 Not tainted 4.15.0+ #306 [ 29.950810] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.960142] Call Trace: [ 29.962726] dump_stack+0x194/0x257 [ 29.966339] ? arch_local_irq_restore+0x53/0x53 [ 29.971003] lockdep_rcu_suspicious+0x123/0x170 [ 29.975661] tipc_bearer_find+0x2b4/0x3b0 [ 29.979791] ? tipc_media_addr_printf+0x3a0/0x3a0 [ 29.984630] tipc_nl_compat_link_set+0x329/0x9f0 [ 29.989365] tipc_nl_compat_doit+0x15b/0x670 [ 29.993752] ? security_capable+0x8e/0xc0 [ 29.997880] ? tipc_nl_compat_link_stat_dump+0x3000/0x3000 [ 30.003480] ? ns_capable_common+0xcf/0x160 [ 30.007778] ? ns_capable+0x22/0x30 [ 30.011383] ? __netlink_ns_capable+0xe1/0x120 [ 30.015946] tipc_nl_compat_recv+0x1135/0x18f0 [ 30.020505] ? tipc_nl_compat_doit+0x670/0x670 [ 30.025066] ? tipc_nl_node_dump+0x1290/0x1290 [ 30.029619] ? tipc_nl_compat_bearer_enable+0x5c0/0x5c0 [ 30.034955] ? __save_stack_trace+0x7e/0xd0 [ 30.039266] ? __radix_tree_lookup+0x435/0x5e0 [ 30.043833] genl_family_rcv_msg+0x7b7/0xfb0 [ 30.048223] ? genl_rcv+0x40/0x40 [ 30.051673] ? retint_kernel+0x10/0x10 [ 30.055561] genl_rcv_msg+0xb2/0x140 [ 30.059255] netlink_rcv_skb+0x14b/0x380 [ 30.063291] ? genl_family_rcv_msg+0xfb0/0xfb0 [ 30.067851] ? netlink_ack+0xa10/0xa10 [ 30.071734] ? genl_rcv+0x19/0x40 [ 30.075167] ? netlink_skb_destructor+0x1d0/0x1d0 [ 30.079992] ? selinux_nlmsg_lookup+0x32b/0x430 [ 30.084648] genl_rcv+0x28/0x40 [ 30.087906] netlink_unicast+0x4c4/0x6b0 [ 30.091965] ? netlink_attachskb+0x8a0/0x8a0 [ 30.096356] ? security_netlink_send+0x81/0xb0 [ 30.100920] netlink_sendmsg+0xa4a/0xe60 [ 30.104967] ? netlink_unicast+0x6b0/0x6b0 [ 30.109184] ? security_socket_sendmsg+0x89/0xb0 [ 30.113915] ? netlink_unicast+0x6b0/0x6b0 [ 30.118126] sock_sendmsg+0xca/0x110 [ 30.121818] ___sys_sendmsg+0x767/0x8b0 [ 30.125772] ? copy_msghdr_from_user+0x590/0x590 [ 30.130511] ? lock_downgrade+0x980/0x980 [ 30.134639] ? check_noncircular+0x20/0x20 [ 30.138849] ? find_held_lock+0x35/0x1d0 [ 30.142892] ? __fget_light+0x2b2/0x3c0 [ 30.146843] ? fget_raw+0x20/0x20 [ 30.150277] ? handle_mm_fault+0x270/0x970 [ 30.154492] ? find_held_lock+0x35/0x1d0 [ 30.158537] ? __do_page_fault+0x5f7/0xc90 [ 30.162748] ? lock_downgrade+0x980/0x980 [ 30.166885] __sys_sendmsg+0xe5/0x210 [ 30.170658] ? __sys_sendmsg+0xe5/0x210 [ 30.174608] ? SyS_shutdown+0x290/0x290 [ 30.178567] ? __do_page_fault+0x3d6/0xc90 [ 30.182790] ? move_addr_to_kernel+0x60/0x60 [ 30.187181] SyS_sendmsg+0x2d/0x50 [ 30.190697] ? __sys_sendmsg+0x210/0x210 [ 30.194737] do_syscall_64+0x282/0x940 [ 30.198600] ? __do_page_fault+0xc90/0xc90 [ 30.202812] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 30.208340] ? syscall_return_slowpath+0x550/0x550 [ 30.213243] ? syscall_return_slowpath+0x2ac/0x550 [ 30.218155] ? retint_user+0x18/0x18 [ 30.221848] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.226676] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 30.231839] RIP: 0033:0x43fdd9 [ 30.235008] RSP: 002b:00007ffcc31d20a8 EFLAGS: 00000203 ORIG_RAX: 000000000000002e [ 30.242700] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdd9 [ 30.249943] RDX: 0000000000000000 RSI: 0000000020003000 RDI: 000