[....] Starting enhanced syslogd: rsyslogd[ 17.087094] audit: type=1400 audit(1518212012.894:5): avc: denied { syslog } for pid=4018 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: [ 23.038374] audit: type=1400 audit(1518212018.846:6): avc: denied { map } for pid=4159 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 '10.128.0.35' (ECDSA) to the list of known hosts. executing program [ 29.382801] audit: type=1400 audit(1518212025.190:7): avc: denied { map } for pid=4173 comm="syzkaller170917" path="/root/syzkaller170917984" 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 [ 29.385557] [ 29.408802] audit: type=1400 audit(1518212025.190:8): avc: denied { create } for pid=4173 comm="syzkaller170917" 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 [ 29.410471] ============================= [ 29.410481] WARNING: suspicious RCU usage [ 29.434346] audit: type=1400 audit(1518212025.190:9): avc: denied { write } for pid=4173 comm="syzkaller170917" 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 [ 29.466598] 4.15.0+ #306 Not tainted [ 29.470524] ----------------------------- [ 29.474704] net/tipc/bearer.c:177 suspicious rcu_dereference_protected() usage! [ 29.482173] [ 29.482173] other info that might help us debug this: [ 29.482173] [ 29.490337] [ 29.490337] rcu_scheduler_active = 2, debug_locks = 1 [ 29.497056] 2 locks held by syzkaller170917/4173: [ 29.501948] #0: (cb_lock){++++}, at: [<00000000636d5d1b>] genl_rcv+0x19/0x40 [ 29.509374] #1: (genl_mutex){+.+.}, at: [<0000000078f2e5be>] genl_rcv_msg+0x115/0x140 [ 29.517573] [ 29.517573] stack backtrace: [ 29.522113] CPU: 1 PID: 4173 Comm: syzkaller170917 Not tainted 4.15.0+ #306 [ 29.529200] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.538534] Call Trace: [ 29.541102] dump_stack+0x194/0x257 [ 29.544714] ? arch_local_irq_restore+0x53/0x53 [ 29.549477] lockdep_rcu_suspicious+0x123/0x170 [ 29.554150] tipc_bearer_find+0x2b4/0x3b0 [ 29.558290] ? tipc_media_addr_printf+0x3a0/0x3a0 [ 29.563122] tipc_nl_compat_link_set+0x329/0x9f0 [ 29.567871] tipc_nl_compat_doit+0x15b/0x670 [ 29.572258] ? security_capable+0x8e/0xc0 [ 29.576382] ? tipc_nl_compat_link_stat_dump+0x3000/0x3000 [ 29.581986] ? ns_capable_common+0xcf/0x160 [ 29.586286] ? ns_capable+0x22/0x30 [ 29.589891] ? __netlink_ns_capable+0xe1/0x120 [ 29.594454] tipc_nl_compat_recv+0x1135/0x18f0 [ 29.599031] ? tipc_nl_compat_doit+0x670/0x670 [ 29.603613] ? tipc_nl_node_dump+0x1290/0x1290 [ 29.608167] ? tipc_nl_compat_bearer_enable+0x5c0/0x5c0 [ 29.613505] ? __save_stack_trace+0x7e/0xd0 [ 29.617816] ? __radix_tree_lookup+0x435/0x5e0 [ 29.622379] genl_family_rcv_msg+0x7b7/0xfb0 [ 29.626772] ? genl_rcv+0x40/0x40 [ 29.630202] ? lock_downgrade+0x980/0x980 [ 29.634332] ? __lock_is_held+0xb6/0x140 [ 29.638397] genl_rcv_msg+0xb2/0x140 [ 29.642100] netlink_rcv_skb+0x14b/0x380 [ 29.646158] ? genl_family_rcv_msg+0xfb0/0xfb0 [ 29.650725] ? netlink_ack+0xa10/0xa10 [ 29.654584] ? genl_rcv+0x19/0x40 [ 29.658023] ? netlink_skb_destructor+0x1d0/0x1d0 [ 29.662852] ? selinux_nlmsg_lookup+0x32b/0x430 [ 29.667504] genl_rcv+0x28/0x40 [ 29.670757] netlink_unicast+0x4c4/0x6b0 [ 29.674800] ? netlink_attachskb+0x8a0/0x8a0 [ 29.679188] ? security_netlink_send+0x81/0xb0 [ 29.683747] netlink_sendmsg+0xa4a/0xe60 [ 29.687791] ? netlink_unicast+0x6b0/0x6b0 [ 29.692007] ? security_socket_sendmsg+0x89/0xb0 [ 29.696840] ? netlink_unicast+0x6b0/0x6b0 [ 29.701062] sock_sendmsg+0xca/0x110 [ 29.704755] ___sys_sendmsg+0x767/0x8b0 [ 29.708720] ? copy_msghdr_from_user+0x590/0x590 [ 29.713468] ? lock_downgrade+0x980/0x980 [ 29.717603] ? check_noncircular+0x20/0x20 [ 29.721817] ? find_held_lock+0x35/0x1d0 [ 29.725871] ? __fget_light+0x2b2/0x3c0 [ 29.729823] ? fget_raw+0x20/0x20 [ 29.733250] ? handle_mm_fault+0x270/0x970 [ 29.737470] ? find_held_lock+0x35/0x1d0 [ 29.741526] ? __do_page_fault+0x5f7/0xc90 [ 29.745747] ? lock_downgrade+0x980/0x980 [ 29.749908] __sys_sendmsg+0xe5/0x210 [ 29.753689] ? __sys_sendmsg+0xe5/0x210 [ 29.757657] ? SyS_shutdown+0x290/0x290 [ 29.761625] ? __do_page_fault+0x3d6/0xc90 [ 29.765867] ? move_addr_to_kernel+0x60/0x60 [ 29.770258] SyS_sendmsg+0x2d/0x50 [ 29.773778] ? __sys_sendmsg+0x210/0x210 [ 29.777814] do_syscall_64+0x282/0x940 [ 29.781676] ? __do_page_fault+0xc90/0xc90 [ 29.785887] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 29.791404] ? syscall_return_slowpath+0x550/0x550 [ 29.796315] ? syscall_return_slowpath+0x2ac/0x550 [ 29.801224] ? retint_user+0x18/0x18 [ 29.804917] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.809753] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 29.814936] RIP: 0033:0x43fd69 [ 29.818114] RSP: 002b:00007ffd334a56d8 EFLAGS: 00000203 ORIG_RAX: 000000000000002e [ 29.825809] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd69 [ 29.833056] RDX: 0