[....] Starting enhanced syslogd: rsyslogd[ 11.951023] audit: type=1400 audit(1561602052.907:4): avc: denied { syslog } for pid=1908 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 Warning: Permanently added '10.128.10.33' (ECDSA) to the list of known hosts. 2019/06/27 02:21:17 parsed 1 programs 2019/06/27 02:21:19 executed programs: 0 syzkaller login: [ 39.034848] audit: type=1400 audit(1561602079.997:5): avc: denied { associate } for pid=2081 comm="syz-executor.0" name="syz0" scontext=unconfined_u:object_r:unlabeled_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=filesystem permissive=1 [ 39.075273] [ 39.076950] =============================== [ 39.081291] [ INFO: suspicious RCU usage. ] [ 39.085637] 4.9.183+ #4 Not tainted [ 39.089256] ------------------------------- [ 39.093556] ./include/linux/inetdevice.h:205 suspicious rcu_dereference_check() usage! [ 39.102184] [ 39.102184] other info that might help us debug this: [ 39.102184] [ 39.110347] [ 39.110347] rcu_scheduler_active = 2, debug_locks = 0 [ 39.117041] 4 locks held by syz-executor.0/2229: [ 39.121787] #0: (rcu_read_lock_bh){......}, at: [<0000000075cc5daf>] ip_finish_output2+0x20b/0x1280 [ 39.131714] #1: (rcu_read_lock_bh){......}, at: [<00000000449b7a1e>] __dev_queue_xmit+0x1d4/0x1bd0 [ 39.141508] #2: (_xmit_TUNNEL6#2){+.....}, at: [<00000000129f24b2>] __dev_queue_xmit+0x1116/0x1bd0 [ 39.151513] #3: (slock-AF_INET){+.-...}, at: [<00000000773f0318>] __icmp_send+0x48b/0x1420 [ 39.160668] [ 39.160668] stack backtrace: [ 39.165177] CPU: 1 PID: 2229 Comm: syz-executor.0 Not tainted 4.9.183+ #4 [ 39.172109] ffff8801cbb06dd8 ffffffff81b580a1 ffff8801d036e500 0000000000000000 [ 39.180105] 0000000000000002 00000000000000cd ffff8801cc3f4740 ffff8801cbb06e08 [ 39.188112] ffffffff81404fb9 ffff8801d036e558 ffff8801cbb06f28 ffff8801d9d5c400 [ 39.196137] Call Trace: [ 39.198726] [<0000000014b87cc2>] dump_stack+0xc1/0x120 [ 39.204083] [<00000000d3382124>] lockdep_rcu_suspicious.cold+0x10a/0x149 [ 39.210987] [<00000000c766ca0e>] fib_compute_spec_dst+0x6c4/0xcc0 [ 39.217294] [<000000006a9febeb>] ? fib_unmerge+0x4c0/0x4c0 [ 39.223013] [<00000000bceee978>] ? trace_hardirqs_on+0x10/0x10 [ 39.229048] [<000000007e0905bf>] ? __lock_acquire+0x5e5/0x4350 [ 39.235084] [<000000007a85cc90>] __ip_options_echo+0x4be/0x13e0 [ 39.241207] [<000000005dcdf219>] __icmp_send+0x648/0x1420 [ 39.246828] [<00000000c33dce26>] ? __icmp_send+0xc07/0x1420 [ 39.252606] [<000000007e0905bf>] ? __lock_acquire+0x5e5/0x4350 [ 39.258642] [<00000000cc46c62a>] ? icmpv4_xrlim_allow.isra.0+0x2d0/0x2d0 [ 39.265552] [<00000000bceee978>] ? trace_hardirqs_on+0x10/0x10 [ 39.271607] [<00000000b681b196>] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 39.278354] [<0000000025304bfc>] ? __ip_options_compile+0x668/0x13c0 [ 39.284953] [<0000000093cd1270>] ? check_preemption_disabled+0x3c/0x200 [ 39.291771] [<00000000dc17d5c1>] ? ipv4_link_failure+0x410/0x850 [ 39.297983] [<00000000fec474fc>] ipv4_link_failure+0x460/0x850 [ 39.304020] [<000000002de080e8>] ? ipv4_link_failure+0x32b/0x850 [ 39.310229] [<0000000048daa495>] ? rt_dst_alloc+0x450/0x450 [ 39.316006] [<0000000048daa495>] ? rt_dst_alloc+0x450/0x450 [ 39.321809] [<00000000a309e321>] vti6_tnl_xmit+0xb08/0x17f0 [ 39.327587] [<00000000300ab9b1>] ? vti6_dellink+0x270/0x270 [ 39.333364] [<00000000bc0c3b64>] dev_hard_start_xmit+0x195/0x8b0 [ 39.339575] [<00000000394e35f1>] __dev_queue_xmit+0x11a3/0x1bd0 [ 39.345695] [<00000000449b7a1e>] ? __dev_queue_xmit+0x1d4/0x1bd0 [ 39.351904] [<000000007eb336b6>] ? __local_bh_enable_ip+0x6a/0xe0 [ 39.358201] [<00000000f1079325>] ? netdev_pick_tx+0x300/0x300 [ 39.364150] [<00000000e6369e55>] ? __neigh_create+0x96e/0x1b30 [ 39.370184] [<0000000097476257>] dev_queue_xmit+0x18/0x20 [ 39.375786] [<0000000074c66f94>] neigh_direct_output+0x16/0x20 [ 39.381820] [<0000000034b80a8e>] ip_finish_output2+0x6a2/0x1280 [ 39.387948] [<0000000075cc5daf>] ? ip_finish_output2+0x20b/0x1280 [ 39.394245] [<00000000145c27b1>] ? rcu_read_lock_held+0x9e/0xc0 [ 39.400366] [<000000005c09de91>] ? nf_iterate+0x19e/0x310 [ 39.405969] [<000000006bca3ed5>] ? ip_send_check+0xb0/0xb0 [ 39.411658] [<00000000b681b196>] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 39.418394] [<0000000084e7708b>] ? nf_hook_slow+0x12f/0x1f0 [ 39.424169] [<0000000066ec9c4a>] ip_finish_output+0x3c4/0xce0 [ 39.430116] [<0000000042788dd6>] ip_output+0x1ec/0x5b0 [ 39.435455] [<00000000b05a0100>] ? ip_output+0x287/0x5b0 [ 39.440967] [<00000000c4db88d2>] ? ip_mc_output+0xcb0/0xcb0 [ 39.446762] [<000000008d2ff22c>] ? nf_hook_slow+0x62/0x1f0 [ 39.452450] [<00000000511f694b>] ? ip_fragment.constprop.0+0x210/0x210 [ 39.459184] [<0000000093cd1270>] ? check_preemption_disabled+0x3c/0x200 [ 39.466013] [<00000000a4cfa5db>] ? raw_sendmsg+0x1929/0x23e0 [ 39.471874] [<0000000076676432>] raw_sendmsg+0x1c5c/0x23e0 [ 39.477560] [<00000000cfae1cde>] ? raw_sendmsg+0x1851/0x23e0 [ 39.483445] [<00000000e4f812e5>] ? avc_has_perm+0x164/0x3a0 [ 39.489226] [<000000002ef9bbe0>] ? compat_raw_setsockopt+0xd0/0xd0 [ 39.495611] [<000000007e0905bf>] ? __lock_acquire+0x5e5/0x4350 [ 39.501661] [<00000000b681b196>] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 39.508396] [<0000000093cd1270>] ? check_preemption_disabled+0x3c/0x200 [ 39.515214] [<00000000a7b22bce>] ? trace_hardirqs_on_caller+0x4f2/0x5a0 [ 39.522031] [<0000000083fc8e24>] ? ip4_datagram_release_cb+0x970/0x970 [ 39.528762] [<00000000c492a197>] ? selinux_msg_queue_alloc_security+0x2e0/0x2e0 [ 39.536274] [<00000000b681b196>] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 39.543007] [<0000000093cd1270>] ? check_preemption_disabled+0x3c/0x200 [ 39.549825] [<0000000093cd1270>] ? check_preemption_disabled+0x3c/0x200 [ 39.556643] [<0000000093cd1270>] ? check_preemption_disabled+0x3c/0x200 [ 39.563463] [<00000000423c9a83>] ? inet_sendmsg+0x143/0x4d0 [ 39.569240] [<000000005e9952ae>] inet_sendmsg+0x202/0x4d0 [ 39.574848] [<00000000dd4cf89a>] ? inet_sendmsg+0x76/0x4d0 [ 39.580549] [<00000000dc5ae5f1>] ? inet_recvmsg+0x4d0/0x4d0 [ 39.586326] [<000000009870ea2f>] sock_sendmsg+0xbe/0x110 [ 39.591840] [<000000003f5632b0>] sock_write_iter+0x235/0x3d0 [ 39.597710] [<000000006b456f3e>] ? sock_sendmsg+0x110/0x110 [ 39.603491] [<000000003d4e0002>] ? iov_iter_init+0xaf/0x1d0 [ 39.609280] [<0000000027c20369>] __vfs_write+0x3c1/0x560 [ 39.614814] [<00000000a1147336>] ? bpf_fd_pass+0x270/0x270 [ 39.620505] [<000000006b60c99b>] ? __vfs_read+0x550/0x550 [ 39.626118] [<000000001b176eab>] ? trace_hardirqs_on+0xd/0x10 [ 39.632066] [<00000000327f35d0>] ? selinux_file_permission+0x85/0x470 [ 39.638709] [<00000000614f129d>] ? security_file_permission+0x8f/0x1f0 [ 39.645456] [<000000000e7c6535>] ? rw_verify_area+0xea/0x2b0 [ 39.651335] [<00000000b86821dd>] vfs_write+0x185/0x520 [ 39.656675] [<00000000e2af2cee>] SyS_write+0x121/0x270 [ 39.662018] [<00000000fd4c83c0>] ? SyS_read+0x270/0x270 [ 39.667447] [<000000002182e183>] ? do_syscall_64+0x4a/0x5c0 [ 39.673222] [<00000000fd4c83c0>] ? SyS_read+0x270/0x