[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 45.122757][ T26] audit: type=1800 audit(1554317654.518:25): pid=7742 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 45.161357][ T26] audit: type=1800 audit(1554317654.518:26): pid=7742 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 45.196922][ T26] audit: type=1800 audit(1554317654.518:27): pid=7742 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 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. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.28' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 62.136891][ T7894] nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based firewall rule not found. Use the iptables CT target to attach helpers instead. [ 62.156153][ T7894] check_preemption_disabled: 3 callbacks suppressed [ 62.156165][ T7894] BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor218/7894 [ 62.173161][ T7894] caller is ip6_finish_output+0x335/0xdc0 [ 62.179232][ T7894] CPU: 0 PID: 7894 Comm: syz-executor218 Not tainted 5.1.0-rc2+ #118 [ 62.187313][ T7894] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.197494][ T7894] Call Trace: [ 62.200965][ T7894] dump_stack+0x172/0x1f0 [ 62.205384][ T7894] __this_cpu_preempt_check+0x246/0x270 [ 62.214755][ T7894] ip6_finish_output+0x335/0xdc0 [ 62.227601][ T7894] ip6_output+0x235/0x7f0 [ 62.231954][ T7894] ? ip6_finish_output+0xdc0/0xdc0 [ 62.237064][ T7894] ? ip6_fragment+0x38b0/0x38b0 [ 62.241911][ T7894] ? ip_reply_glue_bits+0xc0/0xc0 [ 62.246962][ T7894] ip6_local_out+0xc4/0x1b0 [ 62.251459][ T7894] ip6_send_skb+0xbb/0x350 [ 62.255890][ T7894] udp_v6_send_skb.isra.0+0x839/0x14f0 [ 62.261429][ T7894] ? __sanitizer_cov_trace_switch+0x20/0x80 [ 62.267382][ T7894] udpv6_sendmsg+0x21e3/0x28d0 [ 62.272228][ T7894] ? ip_reply_glue_bits+0xc0/0xc0 [ 62.277528][ T7894] ? udp6_unicast_rcv_skb.isra.0+0x2f0/0x2f0 [ 62.283521][ T7894] ? mark_held_locks+0xf0/0xf0 [ 62.288276][ T7894] ? __lock_acquire+0x548/0x3fb0 [ 62.293237][ T7894] ? __local_bh_enable_ip+0x15a/0x270 [ 62.298639][ T7894] ? release_sock+0x158/0x1c0 [ 62.303460][ T7894] ? __local_bh_enable_ip+0x15a/0x270 [ 62.308832][ T7894] ? _raw_spin_unlock_bh+0x31/0x40 [ 62.314070][ T7894] inet_sendmsg+0x147/0x5e0 [ 62.318655][ T7894] ? udp6_unicast_rcv_skb.isra.0+0x2f0/0x2f0 [ 62.324755][ T7894] ? inet_sendmsg+0x147/0x5e0 [ 62.329454][ T7894] ? ipip_gro_receive+0x100/0x100 [ 62.334522][ T7894] sock_sendmsg+0xdd/0x130 [ 62.338946][ T7894] __sys_sendto+0x262/0x380 [ 62.343457][ T7894] ? __ia32_sys_getpeername+0xb0/0xb0 [ 62.348849][ T7894] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 62.357117][ T7894] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 62.362685][ T7894] ? do_syscall_64+0x26/0x610 [ 62.367440][ T7894] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 62.373498][ T7894] __x64_sys_sendto+0xe1/0x1a0 [ 62.378262][ T7894] do_syscall_64+0x103/0x610 [ 62.382842][ T7894] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 62.388755][ T7894] RIP: 0033:0x4401e9 [ 62.392635][ T7894] 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 [ 62.412401][ T7894] RSP: 002b:00007fff6311de88 EFLAGS: 00000246 ORIG_RAX: 000000000000002c [ 62.420827][ T7894] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401e9 [ 62.428818][ T7894] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 [ 62.436793][ T7894] RBP: 00000000006ca018 R08: 00000000200001c0 R09: 000000000000001b [ 62.444919][ T7894] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a70 [ 62.452959][ T7894] R13: 0000000000401b00 R14: 0000000000000000 R15: 0000000000000000 [ 62.462270][ T7894] BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor218/7894 [ 62.471797][ T7894] caller is sk_mc_loop+0x1d/0x210 [ 62.476967][ T7894] CPU: 0 PID: 7894 Comm: syz-executor218 Not tainted 5.1.0-rc2+ #118 [ 62.485059][ T7894] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.495104][ T7894] Call Trace: [ 62.498557][ T7894] dump_stack+0x172/0x1f0 [ 62.503147][ T7894] __this_cpu_preempt_check+0x246/0x270 [ 62.508723][ T7894] sk_mc_loop+0x1d/0x210 [ 62.512953][ T7894] ip6_finish_output2+0x17a5/0x2550 [ 62.518161][ T7894] ? find_held_lock+0x35/0x130 [ 62.522913][ T7894] ? ip6_mtu+0x2e6/0x460 [ 62.527140][ T7894] ? ip6_forward_finish+0x580/0x580 [ 62.532331][ T7894] ? lock_downgrade+0x880/0x880 [ 62.537183][ T7894] ? rcu_read_unlock_special+0xf3/0x210 [ 62.542730][ T7894] ip6_finish_output+0x614/0xdc0 [ 62.547665][ T7894] ? ip6_finish_output+0x614/0xdc0 [ 62.552776][ T7894] ip6_output+0x235/0x7f0 [ 62.557092][ T7894] ? ip6_finish_output+0xdc0/0xdc0 [ 62.562214][ T7894] ? ip6_fragment+0x38b0/0x38b0 [ 62.567075][ T7894] ? ip_reply_glue_bits+0xc0/0xc0 [ 62.572090][ T7894] ip6_local_out+0xc4/0x1b0 [ 62.576645][ T7894] ip6_send_skb+0xbb/0x350 [ 62.581395][ T7894] udp_v6_send_skb.isra.0+0x839/0x14f0 [ 62.586859][ T7894] ? __sanitizer_cov_trace_switch+0x20/0x80 [ 62.592781][ T7894] udpv6_sendmsg+0x21e3/0x28d0 [ 62.597556][ T7894] ? ip_reply_glue_bits+0xc0/0xc0 [ 62.602570][ T7894] ? udp6_unicast_rcv_skb.isra.0+0x2f0/0x2f0 [ 62.608546][ T7894] ? mark_held_locks+0xf0/0xf0 [ 62.613325][ T7894] ? __lock_acquire+0x548/0x3fb0 [ 62.618280][ T7894] ? __local_bh_enable_ip+0x15a/0x270 [ 62.623652][ T7894] ? release_sock+0x158/0x1c0 [ 62.628425][ T7894] ? __local_bh_enable_ip+0x15a/0x270 [ 62.633808][ T7894] ? _raw_spin_unlock_bh+0x31/0x40 [ 62.638918][ T7894] inet_sendmsg+0x147/0x5e0 [ 62.643433][ T7894] ? udp6_unicast_rcv_skb.isra.0+0x2f0/0x2f0 [ 62.649423][ T7894] ? inet_sendmsg+0x147/0x5e0 [ 62.654220][ T7894] ? ipip_gro_receive+0x100/0x100 [ 62.659337][ T7894] sock_sendmsg+0xdd/0x130 [ 62.663818][ T7894] __sys_sendto+0x262/0x380 [ 62.668377][ T7894] ? __ia32_sys_getpeername+0xb0/0xb0 [ 62.673798][ T7894] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 62.679435][ T7894] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 62.684906][ T7894] ? do_syscall_64+0x26/0x610 [ 62.689671][ T7894] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 62.695735][ T7894] __x64_sys_sendto+0xe1/0x1a0 [ 62.700517][ T7894] do_syscall_64+0x103/0x610 [ 62.705131][ T7894] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 62.711023][ T7894] RIP: 0033:0x4401e9 [ 62.714904][ T7894] 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 [ 62.734583][ T7894] RSP: 002b:00007fff6311de88 EFLAGS: