[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.262184] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.476813] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 26.992652] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 28.046327] random: sshd: uninitialized urandom read (32 bytes read, 103 bits of entropy available) [ 31.811706] random: sshd: uninitialized urandom read (32 bytes read, 107 bits of entropy available) Warning: Permanently added '10.128.10.22' (ECDSA) to the list of known hosts. [ 37.374741] random: sshd: uninitialized urandom read (32 bytes read, 110 bits of entropy available) 2018/04/25 19:37:57 parsed 1 programs 2018/04/25 19:37:57 executed programs: 0 [ 37.967522] IPVS: Creating netns size=2552 id=1 [ 38.275564] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 38.295043] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 38.390526] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 38.409023] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 38.527163] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 38.543641] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 38.561384] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 38.581423] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 39.545814] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 39.592963] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 39.926642] BUG: using __this_cpu_add() in preemptible [00000000] code: syz-executor0/4186 [ 39.935649] caller is __this_cpu_preempt_check+0x1c/0x20 [ 39.941233] CPU: 0 PID: 4186 Comm: syz-executor0 Not tainted 4.4.128-gbd23e3a #19 [ 39.948849] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.958188] 0000000000000000 23146e41d67931c7 ffff8800b9937790 ffffffff81e0daad [ 39.966207] 0000000000000000 ffffffff83c132c0 ffffffff83f0a340 ffff8801d7236000 [ 39.974225] 0000000000000003 ffff8800b99377d0 ffffffff81eb73d3 ffff8800b44932fc [ 39.982252] Call Trace: [ 39.984837] [] dump_stack+0xc1/0x124 [ 39.990192] [] check_preemption_disabled.cold.0+0x7f/0x8b [ 39.997367] [] __this_cpu_preempt_check+0x1c/0x20 [ 40.003857] [] tcp_try_coalesce+0x22a/0x4c0 [ 40.009826] [] ? tcp_parse_options+0x970/0x970 [ 40.016051] [] tcp_queue_rcv+0x127/0x6f0 [ 40.021753] [] tcp_send_rcvq+0x3a6/0x470 [ 40.027447] [] ? tcp_rcv_established+0x1fe0/0x1fe0 [ 40.034013] [] ? trace_event_raw_event_irq_handler_exit+0x1b0/0x1e0 [ 40.042079] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 40.048922] [] ? lock_sock_nested+0x90/0x120 [ 40.054971] [] ? trace_hardirqs_on+0xd/0x10 [ 40.060924] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 40.067256] [] tcp_sendmsg+0x231e/0x2b20 [ 40.072948] [] ? sock_has_perm+0x29f/0x400 [ 40.078819] [] ? tcp_sendpage+0x1840/0x1840 [ 40.084774] [] ? inet_sendmsg+0x143/0x4d0 [ 40.090556] [] inet_sendmsg+0x203/0x4d0 [ 40.096176] [] ? inet_sendmsg+0x73/0x4d0 [ 40.101956] [] ? inet_recvmsg+0x4c0/0x4c0 [ 40.107881] [] sock_sendmsg+0xcc/0x110 [ 40.113413] [] SYSC_sendto+0x21c/0x370 [ 40.119038] [] ? SYSC_connect+0x300/0x300 [ 40.124835] [] ? native_set_pte_at+0xe0/0xe0 [ 40.130899] [] ? do_huge_pmd_anonymous_page+0x737/0x9d0 [ 40.137928] [] ? _raw_spin_unlock+0x2c/0x50 [ 40.143947] [] ? compat_SyS_futex+0x1e1/0x2f0 [ 40.150107] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 40.157111] [] SyS_sendto+0x40/0x50 [ 40.162375] [] ? SyS_getpeername+0x30/0x30 [ 40.168247] [] do_fast_syscall_32+0x326/0x8b0 [ 40.174383] [] sysente