[....] Starting enhanced syslogd: rsyslogd[ 15.592628] audit: type=1400 audit(1552752858.198:4): avc: denied { syslog } for pid=1925 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 '10.128.0.183' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 49.393127] BUG: using __this_cpu_add() in preemptible [00000000] code: syz-executor436/6233 [ 49.401954] caller is __this_cpu_preempt_check+0x1d/0x30 [ 49.407509] CPU: 1 PID: 6233 Comm: syz-executor436 Not tainted 4.4.174+ #17 [ 49.414700] 0000000000000000 6f2941ed46ca0d16 ffff8801d9f8f750 ffffffff81aad1a1 [ 49.422762] ffff8801da7997c0 0000000000000001 ffffffff82a861e0 ffffffff8292c040 [ 49.430793] 0000000000000001 ffff8801d9f8f790 ffffffff81b0ad83 ffff8800bb1f6280 [ 49.438932] Call Trace: [ 49.441505] [] dump_stack+0xc1/0x120 [ 49.446855] [] check_preemption_disabled+0x1d3/0x200 [ 49.453594] [] __this_cpu_preempt_check+0x1d/0x30 [ 49.460096] [] tcp_try_coalesce+0x245/0x510 [ 49.466074] [] ? tcp_prune_ofo_queue.part.0+0x460/0x460 [ 49.473076] [] ? skb_copy_datagram_from_iter+0x32b/0x5c0 [ 49.480202] [] tcp_queue_rcv+0x127/0x6f0 [ 49.485896] [] tcp_send_rcvq+0x3de/0x4a0 [ 49.491588] [] ? tcp_rcv_established+0x2070/0x2070 [ 49.498175] [] ? trace_hardirqs_on_caller+0x385/0x5a0 [ 49.505196] [] ? lock_sock_nested+0x90/0x120 [ 49.511239] [] ? trace_hardirqs_on+0xd/0x10 [ 49.517194] [] ? __local_bh_enable_ip+0x6a/0xe0 [ 49.523492] [] tcp_sendmsg+0x2332/0x2ab0 [ 49.529183] [] ? trace_hardirqs_on+0x10/0x10 [ 49.535243] [] ? sock_has_perm+0x2a8/0x400 [ 49.541114] [] ? selinux_msg_queue_alloc_security+0x2e0/0x2e0 [ 49.548648] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 49.555388] [] ? tcp_sendpage+0x17c0/0x17c0 [ 49.561347] [] ? check_preemption_disabled+0x3c/0x200 [ 49.568166] [] ? check_preemption_disabled+0x3c/0x200 [ 49.574991] [] ? inet_sendmsg+0x143/0x4d0 [ 49.580771] [] inet_sendmsg+0x202/0x4d0 [ 49.586461] [] ? inet_sendmsg+0x76/0x4d0 [ 49.592153] [] ? inet_recvmsg+0x4d0/0x4d0 [ 49.597941] [] sock_sendmsg+0xbe/0x110 [ 49.603456] [] sock_write_iter+0x235/0x3d0 [ 49.609326] [] ? sock_sendmsg+0x110/0x110 [ 49.615112] [] ? iov_iter_init+0xb3/0x1e0 [ 49.620893] [] __vfs_write+0x2e8/0x3d0 [ 49.626408] [] ? __vfs_read+0x3c0/0x3c0 [ 49.632011] [] ? selinux_file_permission+0x2f5/0x450 executing program executing program executing program executing program [ 49.638753] [] ? rw_verify_area+0x103/0x2f0 [ 49.644716] [] vfs_write+0x182/0x4e0 [ 49.650060] [] SyS_write+0xdc/0x1c0 [ 49.655330] [] ? SyS_read+0x1c0/0x1c0 [ 49.660769] [] ? do_fast_syscall_32+0xd6/0xa90 [ 49.666980] [] ? SyS_read+0x1c0/0x1c0 [ 49.672417] [] do_fast_syscall_32+0x32d/0xa90 [ 49.678542] [] sysenter_flags_fixed+0xd/0x1a executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 50.162849] BUG: using __this_cpu_add() in preemptible [00000000] code: syz-executor436/6408 [ 50.171885] caller is __this_cpu_preempt_check+0x1d/0x30 [ 50.177327] CPU: 0 PID: 6408 Comm: syz-executor436 Not tainted 4.4.174+ #17 [ 50.184407] 0000000000000000 df341252d2113681 ffff8800bac5f750 ffffffff81aad1a1 [ 50.192550] ffff8800bac40000 0000000000000000 ffffffff82a861e0 ffffffff8292c040 [ 50.200703] 0000000000000002 ffff8800bac5f790 ffffffff81b0ad83 ffff8801da61d680 [ 50.208930] Call Trace: [ 50.211565] [] dump_stack+0xc1/0x120 [ 50.216967] [] check_preemption_disabled+0x1d3/0x200 [ 50.223710] [] __this_cpu_preempt_check+0x1d/0x30 [ 50.230195] [] tcp_try_coalesce+0x245/0x510 [ 50.236177] [] ? tcp_prune_ofo_queue.part.0+0x460/0x460 [ 50.243174] [] ? skb_copy_datagram_from_iter+0x32b/0x5c0 [ 50.250257] [] tcp_queue_rcv+0x127/0x6f0 [ 50.255956] [] tcp_send_rcvq+0x3de/0x4a0 [ 50.261661] [] ? tcp_rcv_established+0x2070/0x2070 [ 50.268240] [] ? trace_hardirqs_on_caller+0x385/0x5a0 [ 50.275939] [] ? lock_sock_nested+0x90/0x120 [ 50.282001] [] ? trace_hardirqs_on+0xd/0x10 [ 50.287967] [] ? __local_bh_enable_ip+0x6a/0xe0 [ 50.294270] [] tcp_sendmsg+0x2332/0x2ab0 [ 50.299965] [] ? trace_hardirqs_on+0x10/0x10 [ 50.306030] [] ? sock_has_perm+0x2a8/0x400 [ 50.311903] [] ? selinux_msg_queue_alloc_security+0x2e0/0x2e0 [ 50.319422] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 50.326158] [] ? tcp_sendpage+0x17c0/0x17c0 [ 50.332110] [] ? check_preemption_disabled+0x3c/0x200 [ 50.338947] [] ? check_preemption_disabled+0x3c/0x200 [ 50.345776] [] ? inet_sendmsg+0x143/0x4d0 [ 50.351560] [] inet_sendmsg+0x202/0x4d0 [ 50.357160] [] ? inet_sendmsg+0x76/0x4d0 [ 50.362878] [] ? inet_recvmsg+0x4d0/0x4d0 [ 50.368745] [] sock_sendmsg+0xbe/0x110 [ 50.374267] [] sock_write_iter+0x235/0x3d0 [ 50.380150] [] ? sock_sendmsg+0x110/0x110 [ 50.386039] [] ? iov_iter_init+0xb3/0x1e0 [ 50.391825] [] __vfs_write+0x2e8/0x3d0 [ 50.397347] [] ? __vfs_read+0x3c0/0x3c0 [ 50.402955] [] ? selinux_file_permission+0x2f5/0x450 executing program executing program executing program executing program [ 50.409697] [] ? rw_verify_area+0x103/0x2f0 [ 50.415740] [] vfs_write+0x182/0x4e0 [ 50.421086] [] SyS_write+0xdc/0x1c0 [ 50.426367] [] ? SyS_read+0x1c0/0x1c0 [ 50.431817] [] ? do_fast_syscall_32+0xd6/0xa90 [ 50.438030] [] ? SyS_read+0x1c0/0x1c0 [ 50.443457] [] do_fast_syscall_32+0x32d/0xa90 [ 50.449583] [] sysenter_flags_fixed+0xd/0x1a executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program