[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.723310] 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: [ 20.812636] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 21.132262] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.942848] random: sshd: uninitialized urandom read (32 bytes read, 102 bits of entropy available) [ 22.096465] random: sshd: uninitialized urandom read (32 bytes read, 104 bits of entropy available) Warning: Permanently added '10.128.15.225' (ECDSA) to the list of known hosts. [ 27.453384] random: sshd: uninitialized urandom read (32 bytes read, 110 bits of entropy available) 2018/02/20 06:23:35 parsed 1 programs 2018/02/20 06:23:35 executed programs: 0 [ 27.791665] IPVS: Creating netns size=2552 id=1 [ 28.482503] BUG: using __this_cpu_add() in preemptible [00000000] code: syz-executor0/3990 [ 28.491092] caller is __this_cpu_preempt_check+0x1c/0x20 [ 28.496717] CPU: 1 PID: 3990 Comm: syz-executor0 Not tainted 4.4.115-g55a366596 #14 [ 28.504499] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.513824] 0000000000000000 c0e3b5523aecd48d ffff8800babff740 ffffffff81d03d8d [ 28.521793] 0000000000000001 ffffffff839fe4a0 ffffffff83cef860 ffff8801c64d1800 [ 28.529784] 0000000000000003 ffff8800babff780 ffffffff81d63cd4 ffffffff81237470 [ 28.537753] Call Trace: [ 28.540311] [] dump_stack+0xc1/0x124 [ 28.545650] [] check_preemption_disabled+0x1d4/0x200 [ 28.552374] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 28.559355] [] __this_cpu_preempt_check+0x1c/0x20 [ 28.565824] [] tcp_try_rmem_schedule+0xf2/0x1180 [ 28.572198] [] ? skb_put+0x149/0x1c0 [ 28.577533] [] tcp_send_rcvq+0x1ba/0x450 [ 28.583210] [] ? tcp_rcv_established+0x2230/0x2230 [ 28.589759] [] ? tcp_sendmsg+0xb3/0x2b10 [ 28.595450] [] ? lock_sock_nested+0xa2/0x120 [ 28.601492] [] ? lock_sock_nested+0x90/0x120 [ 28.607520] [] ? trace_hardirqs_on+0xd/0x10 [ 28.613461] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 28.619752] [] tcp_sendmsg+0x1e8f/0x2b10 [ 28.625436] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 28.632420] [] ? sock_has_perm+0x1c1/0x400 [ 28.638274] [] ? tcp_sendpage+0x1830/0x1830 [ 28.644215] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 28.651292] [] ? inet_sendmsg+0x73/0x4c0 [ 28.656972] [] ? inet_sendmsg+0x201/0x4c0 [ 28.662742] [] inet_sendmsg+0x2bc/0x4c0 [ 28.668348] [] ? inet_sendmsg+0x73/0x4c0 [ 28.674049] [] ? inet_recvmsg+0x4c0/0x4c0 [ 28.679831] [] sock_sendmsg+0xca/0x110 [ 28.685339] [] ___sys_sendmsg+0x6c1/0x7c0 [ 28.691106] [] ? copy_msghdr_from_user+0x550/0x550 [ 28.697653] [] ? do_futex+0x3f4/0x15d0 [ 28.703162] [] ? filemap_map_pages+0x508/0x9d0 [ 28.709370] [] ? filemap_map_pages+0x10a/0x9d0 [ 28.715576] [] ? exit_robust_list+0x240/0x240 [ 28.721689] [] ? grab_cache_page_write_begin+0x90/0x90 [ 28.728585] [] ? handle_mm_fault+0x192d/0x3190 [ 28.734788] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.740730] [] ? __fget_light+0xa1/0x1e0 [ 28.746416] [] ? __fdget+0x18/0x20 [ 28.751577] [] __sys_sendmsg+0xd3/0x190 [ 28.757170] [] ? SyS_shutdown+0x1b0/0x1b0 [ 28.762937] [] ? SyS_futex+0x210/0x2c0 [ 28.768445] [] ? move_addr_to_kernel+0x50/0x50 [ 28.774644] [] SyS_sendmsg+0x2d/0x50 [ 28.779984] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 28.786821] BUG: using __this_cpu_add() in preemptible [00000000] code: syz-executor0/3990 [ 28.795413] caller is __this_cpu_preempt_check+0x1c/0x20 [ 28.800839] CPU: 1 PID: 3990 Comm: syz-executor0 Not tainted 4.4.115-g55a366596 #14 [ 28.808601] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.817923] 0000000000000000 c0e3b5523aecd48d ffff8800babff740 ffffffff81d03d8d [ 28.825900] 0000000000000001 ffffffff839fe4a0 ffffffff83cef860 ffff8801c64d1800 [ 28.833864] 0000000000000003 ffff8800babff780 ffffffff81d63cd4 ffffffff8313163a [ 28.841826] Call Trace: [ 28.844385] [] dump_stack+0xc1/0x124 [ 28.849723] [] check_preemption_disabled+0x1d4/0x200 [ 28.856447] [] ? tcp_prune_ofo_queue+0x30a/0x420 [ 28.862820] [] __this_cpu_preempt_check+0x1c/0x20 [ 28.869283] [] tcp_try_rmem_schedule+0xe33/0x1180 [ 28.875747] [] tcp_send_rcvq+0x1ba/0x450 [ 28.881425] [] ? tcp_rcv_established+0x2230/0x2230 [ 28.887975] [] ? tcp_sendmsg+0xb3/0x2b10 [ 28.893656] [] ? lock_sock_nested+0xa2/0x120 [ 28.899682] [] ? lock_sock_nested+0x90/0x120 [ 28.905736] [] ? trace_hardirqs_on+0xd/0x10 [ 28.911689] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 28.917987] [] tcp_sendmsg+0x1e8f/0x2b10 [ 28.923667] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 28.930662] [] ? sock_