[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.803916] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.224024] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.531654] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.419937] random: sshd: uninitialized urandom read (32 bytes read, 97 bits of entropy available) [ 21.590185] random: sshd: uninitialized urandom read (32 bytes read, 102 bits of entropy available) Warning: Permanently added '10.128.15.193' (ECDSA) to the list of known hosts. [ 26.990215] random: sshd: uninitialized urandom read (32 bytes read, 107 bits of entropy available) executing program [ 27.127876] device lo entered promiscuous mode [ 27.135105] BUG: using __this_cpu_add() in preemptible [00000000] code: syzkaller841091/3320 [ 27.143721] caller is __this_cpu_preempt_check+0x1c/0x20 [ 27.149251] CPU: 0 PID: 3320 Comm: syzkaller841091 Not tainted 4.4.107-g610c835 #4 [ 27.157101] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.166439] 0000000000000000 0a0f97a9a91e334a ffff8800b4377788 ffffffff81d0457d [ 27.174394] 0000000000000000 ffffffff839fd5a0 ffffffff83cedc20 ffff8801d27edf00 [ 27.182356] 0000000000000003 ffff8800b43777c8 ffffffff81d63f24 ffffffff810002b8 [ 27.190311] Call Trace: [ 27.192867] [] dump_stack+0xc1/0x124 [ 27.198197] [] check_preemption_disabled+0x1d4/0x200 [ 27.204922] [] ? 0xffffffff810002b8 [ 27.210164] [] __this_cpu_preempt_check+0x1c/0x20 [ 27.216621] [] tcp_try_coalesce+0x249/0x4d0 [ 27.222558] [] ? tcp_parse_options+0x970/0x970 [ 27.228759] [] ? skb_copy_datagram_from_iter+0x38c/0x5a0 [ 27.235824] [] tcp_queue_rcv+0x127/0x720 [ 27.241530] [] tcp_send_rcvq+0x39b/0x450 [ 27.247818] [] ? tcp_rcv_established+0x2230/0x2230 [ 27.254371] [] ? do_softirq.part.17+0x40/0x60 [ 27.260483] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 27.267289] [] ? lock_sock_nested+0x90/0x120 [ 27.273748] [] ? trace_hardirqs_on+0xd/0x10 [ 27.279687] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 27.285978] [] tcp_sendmsg+0x1e8f/0x2b10 [ 27.291669] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 27.298653] [] ? sock_has_perm+0x1c2/0x3e0 [ 27.304764] [] ? tcp_sendpage+0x1830/0x1830 [ 27.310704] [] ? inet_sendmsg+0x201/0x4c0 [ 27.316474] [] inet_sendmsg+0x2bc/0x4c0 [ 27.322062] [] ? inet_sendmsg+0x73/0x4c0 [ 27.327749] [] ? inet_recvmsg+0x4c0/0x4c0 [ 27.333515] [] sock_sendmsg+0xca/0x110 [ 27.339021] [] SYSC_sendto+0x2c8/0x340 [ 27.344530] [] ? SYSC_connect+0x310/0x310 [ 27.351861] [] ? do_huge_pmd_anonymous_page+0x549/0xa10 [ 27.358841] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.364780] [] SyS_sendto+0x40/0x50 [ 27.370024] [] ? SyS_getpeername+0x30/0x30 [ 27.375874] []