[ 35.850637][ T26] audit: type=1800 audit(1554234939.040:27): pid=7444 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 35.850665][ T26] audit: type=1800 audit(1554234939.040:28): pid=7444 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.371606][ T26] audit: type=1800 audit(1554234939.600:29): pid=7444 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 36.399088][ T26] audit: type=1800 audit(1554234939.620:30): pid=7444 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.50' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 43.000823][ T7596] BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor222/7596 [ 43.010386][ T7596] caller is ip6_finish_output+0x335/0xdc0 [ 43.016088][ T7596] CPU: 1 PID: 7596 Comm: syz-executor222 Not tainted 5.1.0-rc2+ #118 [ 43.024123][ T7596] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.034156][ T7596] Call Trace: [ 43.037432][ T7596] dump_stack+0x172/0x1f0 [ 43.041754][ T7596] __this_cpu_preempt_check+0x246/0x270 [ 43.047281][ T7596] ip6_finish_output+0x335/0xdc0 [ 43.052198][ T7596] ip6_output+0x235/0x7f0 [ 43.056516][ T7596] ? ip6_finish_output+0xdc0/0xdc0 [ 43.061616][ T7596] ? ip6_fragment+0x38b0/0x38b0 [ 43.066450][ T7596] ? unpair_device+0x6d8/0xfb0 [ 43.071205][ T7596] ip6_xmit+0xe41/0x20c0 [ 43.075430][ T7596] ? ip6_finish_output2+0x2550/0x2550 [ 43.081913][ T7596] ? mark_held_locks+0xf0/0xf0 [ 43.086661][ T7596] ? ip6_setup_cork+0x1870/0x1870 [ 43.091672][ T7596] ? unpair_device+0x680/0xfb0 [ 43.096417][ T7596] inet6_csk_xmit+0x2fb/0x5d0 [ 43.101076][ T7596] ? inet6_csk_update_pmtu+0x190/0x190 [ 43.106530][ T7596] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 43.112768][ T7596] ? csum_ipv6_magic+0x20/0x80 [ 43.117515][ T7596] __tcp_transmit_skb+0x1a32/0x3750 [ 43.122701][ T7596] ? __tcp_select_window+0x8b0/0x8b0 [ 43.127978][ T7596] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 43.134198][ T7596] ? tcp_fastopen_no_cookie+0xe0/0x190 [ 43.139643][ T7596] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 43.145869][ T7596] tcp_connect+0x1e47/0x4280 [ 43.150444][ T7596] ? tcp_push_one+0x110/0x110 [ 43.155099][ T7596] ? secure_tcpv6_ts_off+0x24f/0x360 [ 43.160365][ T7596] ? secure_dccpv6_sequence_number+0x280/0x280 [ 43.166506][ T7596] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 43.172755][ T7596] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 43.178977][ T7596] ? prandom_u32_state+0x13/0x180 [ 43.184034][ T7596] tcp_v6_connect+0x150b/0x20a0 [ 43.188867][ T7596] ? tcp_sendmsg_locked+0x2170/0x37f0 [ 43.194220][ T7596] ? tcp_v6_conn_request+0x2b0/0x2b0 [ 43.199490][ T7596] ? find_held_lock+0x35/0x130 [ 43.204229][ T7596] ? fs_reclaim_acquire.part.0+0x30/0x30 [ 43.209846][ T7596] __inet_stream_connect+0x83f/0xea0 [ 43.215111][ T7596] ? tcp_v6_conn_request+0x2b0/0x2b0 [ 43.220380][ T7596] ? __inet_stream_connect+0x83f/0xea0 [ 43.225839][ T7596] ? inet_dgram_connect+0x2e0/0x2e0 [ 43.231020][ T7596] ? tcp_sendmsg_locked+0x2170/0x37f0 [ 43.236372][ T7596] ? rcu_read_lock_sched_held+0x110/0x130 [ 43.242075][ T7596] ? kmem_cache_alloc_trace+0x354/0x760 [ 43.247608][ T7596] ? __lock_acquire+0x548/0x3fb0 [ 43.252530][ T7596] tcp_sendmsg_locked+0x231f/0x37f0 [ 43.257709][ T7596] ? mark_held_locks+0xf0/0xf0 [ 43.262455][ T7596] ? mark_held_locks+0xa4/0xf0 [ 43.267200][ T7596] ? tcp_sendpage+0x60/0x60 [ 43.271684][ T7596] ? lock_sock_nested+0x9a/0x120 [ 43.276633][ T7596] ? trace_hardirqs_on+0x67/0x230 [ 43.281644][ T7596] ? lock_sock_nested+0x9a/0x120 [ 43.286594][ T7596] ? __local_bh_enable_ip+0x15a/0x270 [ 43.291975][ T7596] tcp_sendmsg+0x30/0x50 [ 43.296216][ T7596] inet_sendmsg+0x147/0x5e0 [ 43.300698][ T7596] ? ipip_gro_receive+0x100/0x100 [ 43.305730][ T7596] sock_sendmsg+0xdd/0x130 [ 43.310130][ T7596] __sys_sendto+0x262/0x380 [ 43.314615][ T7596] ? __ia32_sys_getpeername+0xb0/0xb0 [ 43.319994][ T7596] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 43.325437][ T7596] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 43.330904][ T7596] ? do_syscall_64+0x26/0x610 [ 43.335581][ T7596] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 43.341653][ T7596] __x64_sys_sendto+0xe1/0x1a0 [ 43.346407][ T7596] do_syscall_64+0x103/0x610 [ 43.351005][ T7596] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 43.356882][ T7596] RIP: 0033:0x440189 [ 43.360754][ T7596] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 43.380361][ T7596] RSP: 002b:00007ffed7abd1a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c [ 43.388774][ T7596] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440189 [ 43.396734][ T7596] RDX: 0000000000000000 RSI: 0000000000000000 RD