[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.606773] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.093661] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.497397] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.232804] random: sshd: uninitialized urandom read (32 bytes read, 91 bits of entropy available) [ 22.391052] random: sshd: uninitialized urandom read (32 bytes read, 96 bits of entropy available) Warning: Permanently added 'ci-android-44-kasan-gce-386-0,10.128.15.235' (ECDSA) to the list of known hosts. [ 27.783155] random: sshd: uninitialized urandom read (32 bytes read, 101 bits of entropy available) executing program [ 27.870052] syzkaller205858 uses obsolete (PF_INET,SOCK_PACKET) [ 27.877897] device lo entered promiscuous mode [ 27.886254] BUG: using __this_cpu_add() in preemptible [00000000] code: syzkaller205858/3315 [ 27.894833] caller is __this_cpu_preempt_check+0x1c/0x20 [ 27.900400] CPU: 1 PID: 3315 Comm: syzkaller205858 Not tainted 4.4.107-g79f138a #2 [ 27.908076] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.917396] 0000000000000000 1d4500ad472ec3d6 ffff8800b466f788 ffffffff81d03a1d [ 27.925342] 0000000000000001 ffffffff839fd3a0 ffffffff83cecfe0 ffff8800b5790000 [ 27.933288] 0000000000000003 ffff8800b466f7c8 ffffffff81d633a4 ffffffff810002b8 [ 27.941246] Call Trace: [ 27.943800] [] dump_stack+0xc1/0x124 [ 27.949129] [] check_preemption_disabled+0x1d4/0x200 [ 27.955844] [] ? 0xffffffff810002b8 [ 27.961087] [] __this_cpu_preempt_check+0x1c/0x20 [ 27.967552] [] tcp_try_coalesce+0x249/0x4d0 [ 27.973484] [] ? tcp_parse_options+0x970/0x970 [ 27.979687] [] ? skb_copy_datagram_from_iter+0x38c/0x5a0 [ 27.986754] [] tcp_queue_rcv+0x127/0x720 [ 27.992431] [] tcp_send_rcvq+0x39b/0x450 [ 27.998104] [] ? tcp_rcv_established+0x2230/0x2230 [ 28.004652] [] ? do_softirq.part.17+0x60/0x60 [ 28.010767] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 28.017571] [] ? lock_sock_nested+0x90/0x120 [ 28.023591] [] ? trace_hardirqs_on+0xd/0x10 [ 28.029525] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 28.035806] [] tcp_sendmsg+0x1e8f/0x2b10 [ 28.041479] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 28.048455] [] ? sock_has_perm+0x1c2/0x3e0 [ 28.054301] [] ? tcp_sendpage+0x1830/0x1830 [ 28.060244] [] ? inet_sendmsg+0x201/0x4c0 [ 28.066007] [] inet_sendmsg+0x2bc/0x4c0 [ 28.071592] [] ? inet_sendmsg+0x73/0x4c0 [ 28.077272] [] ? inet_recvmsg+0x4c0/0x4c0 [ 28.083033] [] sock_sendmsg+0xca/0x110 [ 28.088533] [] SYSC_sendto+0x2c8/0x340 [ 28.094038] [] ? SYSC_connect+0x310/0x310 [ 28.099803] [] ? do_huge_pmd_anonymous_page+0x549/0xa10 [ 28.106781] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.112714] [] SyS_sendto+0x40/0x50 [ 28.117955] [] ?