[....] Starting enhanced syslogd: rsyslogd[ 18.017523] audit: type=1400 audit(1518207256.981:5): avc: denied { syslog } for pid=4053 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: [ 22.400509] audit: type=1400 audit(1518207261.364:6): avc: denied { map } for pid=4195 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 '10.128.0.51' (ECDSA) to the list of known hosts. executing program [ 28.746716] audit: type=1400 audit(1518207267.710:7): avc: denied { map } for pid=4209 comm="syzkaller342122" path="/root/syzkaller342122237" 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 [ 28.749642] [ 28.772771] audit: type=1400 audit(1518207267.710:8): avc: denied { create } for pid=4209 comm="syzkaller342122" 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 [ 28.774475] ============================= [ 28.774480] WARNING: suspicious RCU usage [ 28.798356] audit: type=1400 audit(1518207267.710:9): avc: denied { write } for pid=4209 comm="syzkaller342122" 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 [ 28.830465] 4.15.0+ #216 Not tainted [ 28.834503] ----------------------------- [ 28.838667] net/tipc/bearer.c:177 suspicious rcu_dereference_protected() usage! [ 28.846219] [ 28.846219] other info that might help us debug this: [ 28.846219] [ 28.854455] [ 28.854455] rcu_scheduler_active = 2, debug_locks = 1 [ 28.861144] 2 locks held by syzkaller342122/4209: [ 28.866092] #0: (cb_lock){++++}, at: [<00000000ae8adeda>] genl_rcv+0x19/0x40 [ 28.873507] #1: (genl_mutex){+.+.}, at: [<000000004579fa49>] genl_rcv_msg+0x115/0x140 [ 28.881672] [ 28.881672] stack backtrace: [ 28.886191] CPU: 0 PID: 4209 Comm: syzkaller342122 Not tainted 4.15.0+ #216 [ 28.893285] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.902615] Call Trace: [ 28.905184] dump_stack+0x194/0x257 [ 28.908789] ? arch_local_irq_restore+0x53/0x53 [ 28.913455] lockdep_rcu_suspicious+0x123/0x170 [ 28.918108] tipc_bearer_find+0x2b4/0x3b0 [ 28.922234] ? tipc_media_addr_printf+0x3a0/0x3a0 [ 28.927067] tipc_nl_compat_link_set+0x329/0x9f0 [ 28.931805] tipc_nl_compat_doit+0x15b/0x670 [ 28.936190] ? security_capable+0x8e/0xc0 [ 28.940331] ? tipc_nl_compat_link_stat_dump+0x3000/0x3000 [ 28.946032] ? ns_capable_common+0xcf/0x160 [ 28.950331] ? ns_capable+0x22/0x30 [ 28.953936] ? __netlink_ns_capable+0xe1/0x120 [ 28.958520] tipc_nl_compat_recv+0x1135/0x18f0 [ 28.963703] ? tipc_nl_compat_doit+0x670/0x670 [ 28.968261] ? tipc_nl_node_dump+0x1290/0x1290 [ 28.972819] ? tipc_nl_compat_bearer_enable+0x5c0/0x5c0 [ 28.978158] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.983164] ? __radix_tree_lookup+0x435/0x5e0 [ 28.987727] genl_family_rcv_msg+0x7b7/0xfb0 [ 28.992120] ? genl_rcv+0x40/0x40 [ 28.995549] ? lock_downgrade+0x980/0x980 [ 28.999680] ? __lock_is_held+0xb6/0x140 [ 29.003736] genl_rcv_msg+0xb2/0x140 [ 29.007429] netlink_rcv_skb+0x14b/0x380 [ 29.011465] ? genl_family_rcv_msg+0xfb0/0xfb0 [ 29.016037] ? netlink_ack+0xa10/0xa10 [ 29.019897] ? genl_rcv+0x19/0x40 [ 29.023328] ? netlink_skb_destructor+0x1d0/0x1d0 [ 29.028162] ? selinux_nlmsg_lookup+0x32b/0x430 [ 29.032812] genl_rcv+0x28/0x40 [ 29.036068] netlink_unicast+0x4c4/0x6b0 [ 29.040181] ? netlink_attachskb+0x8a0/0x8a0 [ 29.044576] ? security_netlink_send+0x81/0xb0 [ 29.049137] netlink_sendmsg+0xa4a/0xe60 [ 29.053205] ? netlink_unicast+0x6b0/0x6b0 [ 29.057420] ? security_socket_sendmsg+0x89/0xb0 [ 29.062153] ? netlink_unicast+0x6b0/0x6b0 [ 29.066365] sock_sendmsg+0xca/0x110 [ 29.070059] ___sys_sendmsg+0x767/0x8b0 [ 29.074039] ? copy_msghdr_from_user+0x590/0x590 [ 29.078777] ? _raw_spin_unlock+0x22/0x30 [ 29.082911] ? __pmd_alloc+0x4e0/0x4e0 [ 29.086772] ? check_noncircular+0x20/0x20 [ 29.090988] ? __fget_light+0x2b2/0x3c0 [ 29.095044] ? fget_raw+0x20/0x20 [ 29.098492] ? handle_mm_fault+0x270/0x970 [ 29.102704] ? find_held_lock+0x35/0x1d0 [ 29.106757] __sys_sendmsg+0xe5/0x210 [ 29.110533] ? __sys_sendmsg+0xe5/0x210 [ 29.114490] ? SyS_shutdown+0x290/0x290 [ 29.118452] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 29.123007] ? vmacache_find+0x5f/0x280 [ 29.126983] compat_SyS_sendmsg+0x2a/0x40 [ 29.131117] ? compat_SyS_getsockopt+0x420/0x420 [ 29.135852] do_fast_syscall_32+0x3ee/0xfa1 [ 29.140158] ? do_int80_syscall_32+0x9d0/0x9d0 [ 29.144803] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 29.149536] ? syscall_return_slowpath+0x550/0x550 [ 29.154444] ? syscall_return_slowpath+0x2ac/0x550 [ 29.159351] ? prepare_exit_to_usermode+0x350/0x350 [ 29.164360] ? retint_user+0x18/0x18 [ 29.168056] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.172883] entry_SYSENTER_compat+0x54/0x63 [ 29.177270] RIP: 0023:0xf7f6cc79 [ 29.180635] RSP: 002b:00000000fffe591c EFLAGS: 00000203 ORIG_RAX: 0000000000000172 [ 29.188320] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020003000 [ 29.195577] RDX: 0000000000000000 RS