[ 19.580219] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 20.000393] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [ 20.250510] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.106348] random: sshd: uninitialized urandom read (32 bytes read, 100 bits of entropy available) [ 21.248954] random: sshd: uninitialized urandom read (32 bytes read, 102 bits of entropy available) Warning: Permanently added '10.128.0.8' (ECDSA) to the list of known hosts. [ 26.607128] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available) 2018/02/20 02:59:59 parsed 1 programs 2018/02/20 02:59:59 executed programs: 0 [ 26.941448] IPVS: Creating netns size=2552 id=1 [ 27.623572] BUG: using __this_cpu_add() in preemptible [00000000] code: syz-executor0/3999 [ 27.632602] caller is __this_cpu_preempt_check+0x1c/0x20 [ 27.638063] CPU: 1 PID: 3999 Comm: syz-executor0 Not tainted 4.4.115-g55a366596 #15 [ 27.645841] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.655174] 0000000000000000 d6eb376d1a1e3445 ffff8800aa1bf6c0 ffffffff81d03d8d [ 27.663138] 0000000000000001 ffffffff839fe4a0 ffffffff83cef860 ffff8801c5170000 [ 27.671116] 0000000000000003 ffff8800aa1bf700 ffffffff81d63cd4 ffffffff81237470 [ 27.679084] Call Trace: [ 27.681641] [] dump_stack+0xc1/0x124 [ 27.686974] [] check_preemption_disabled+0x1d4/0x200 [ 27.693697] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 27.700677] [] __this_cpu_preempt_check+0x1c/0x20 [ 27.707148] [] tcp_try_rmem_schedule+0xf2/0x1180 [ 27.713523] [] ? skb_put+0x149/0x1c0 [ 27.718856] [] tcp_send_rcvq+0x1ba/0x450 [ 27.724536] [] ? tcp_rcv_established+0x2230/0x2230 [ 27.731084] [] ? tcp_sendmsg+0xb3/0x2b10 [ 27.736762] [] ? lock_sock_nested+0xa2/0x120 [ 27.742796] [] ? lock_sock_nested+0x90/0x120 [ 27.748824] [] ? trace_hardirqs_on+0xd/0x10 [ 27.754772] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 27.761062] [] tcp_sendmsg+0x1e8f/0x2b10 [ 27.766741] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 27.773723] [] ? sock_has_perm+0x1c1/0x400 [ 27.779583] [] ? tcp_sendpage+0x1830/0x1830 [ 27.785531] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 27.792601] [] ? inet_sendmsg+0x73/0x4c0 [ 27.798280] [] ? move_addr_to_kernel.part.12+0xc5/0x110 [ 27.805269] [] ? inet_sendmsg+0x201/0x4c0 [ 27.811035] [] inet_sendmsg+0x2bc/0x4c0 [ 27.816631] [] ? inet_sendmsg+0x73/0x4c0 [ 27.822314] [] ? inet_recvmsg+0x4c0/0x4c0 [ 27.828079] [] sock_sendmsg+0xca/0x110 [ 27.833583] [] ___sys_sendmsg+0x6c1/0x7c0 [ 27.839350] [] ? copy_msghdr_from_user+0x550/0x550 [ 27.845898] [] ? __alloc_pages_direct_compact+0x250/0x250 [ 27.853051] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 27.859338] [] ? do_futex+0x3f4/0x15d0 [ 27.864843] [] ? __wake_up_locked_key+0x20/0x20 [ 27.871137] [] ? exit_robust_list+0x240/0x240 [ 27.877250] [] ? filemap_map_pages+0x508/0x9d0 [ 27.883449] [] ? filemap_map_pages+0x10a/0x9d0 [ 27.889649] [] ? __fget_light+0xa1/0x1e0 [ 27.895334] [] ? __fdget+0x18/0x20 [ 27.900494] [] ? sockfd_lookup_light+0x118/0x160 [ 27.906866] [] __sys_sendmsg+0xd3/0x190 [ 27.912463] [] ? SyS_shutdown+0x1b0/0x1b0 [ 27.918228] [] ? compat_SyS_futex+0x1f9/0x2a0 [ 27.924348] [] ? __do_page_fault+0x380/0xa00 [ 27.930383] [] compat_SyS_sendmsg+0x2a/0x40 [ 27.936322] [] ? compat_SyS_getsockopt+0x2a0/0x2a0 [ 27.942869] [] do_fast_syscall_32+0x314/0x890 [ 27.948984] [] sysenter_flags_fixed+0xd/0x17 [ 27.955553] BUG: using __this_cpu_add() in preemptible [00000000] code: syz-executor0/3999 [ 27.964097] caller is __this_cpu_preempt_check+0x1c/0x20 [ 27.969718] CPU: 1 PID: 3999 Comm: syz-executor0 Not tainted 4.4.115-g55a366596 #15 [ 27.977491] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.986822] 0000000000000000 d6eb376d1a1e3445 ffff8800aa1bf6c0 ffffffff81d03d8d [ 27.994794] 0000000000000001 ffffffff839fe4a0 ffffffff83cef860 ffff8801c5170000 [ 28.002754] 0000000000000003 ffff8800aa1bf700 ffffffff81d63cd4 ffffffff8313163a [ 28.010719] Call Trace: [ 28.013276] [] dump_stack+0xc1/0x124 [ 28.018610] [] check_preemption_disabled+0x1d4/0x200 [ 28.025350] [] ? tcp_prune_ofo_queue+0x30a/0x420 [ 28.031728] [] __this_cpu_preempt_check+0x1c/0x20 [ 28.038188] [] tcp_try_rmem_schedule+0xe33/0x1180 [ 28.044648] [] tcp_send_rcvq+0x1ba/0x450 [ 28.050326] [] ? tcp_rcv_established+0x2230/0x2230 [ 28.056875] [] ? tcp_sendmsg+0xb3/0x2b10 [ 28.062561] [] ? lock_sock_nested+0xa2/0x120 [ 28.068597] [] ? lock_sock_nested+0x90/0x120 [ 28.074632] [] ? trace_hardirqs_on+0xd/0x10 [ 28.080573] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 28.086867] [] tcp_sendmsg+0x1e8f/0x2b10 [ 28.092562] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 28.099543] [] ? sock_has_perm+0x1c1/0x400 [ 28.105397] [] ? tcp_sendpage+0x1830/0x1830 [ 28.111336] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 28.118404] [] ? inet_sendmsg+0x73/0x4c0 [ 28.124085] [] ? move_addr_to_kernel.part.12+0xc5/0x110 [ 28.131064] [] ? inet_sendmsg+0x201/0x4c0 [ 28.136830] [] inet_sendmsg+0x2bc/0x4c0 [ 28.142419] [] ? inet_sendmsg+0x73/0x4c0 [ 28.148096] [] ? inet_recvmsg+0x4c0/0x4c0 [ 28.153859] [] sock_sendmsg+0xca/0x110 [ 28.159372] [] ___sys_sendmsg+0x6c1/0x7c0 [ 28.165135] [] ? copy_msghdr_from_user+0x550/0x550 [ 28.171683] [] ? __alloc_pages_direct_compact+0x250/0x250 [ 28.178840] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 28.185125] [] ? do_futex+0x3f4/0x15d0 [ 28.190630] [] ? __wake_up_locked_key+0x20/0x20 [ 28.196922] [] ? exit_robust_list+0x240/0x240 [ 28.203035] [] ? filemap_map_pages+0x508/0x9d0 [ 28.209235] [] ? filemap_map_pages+0x10a/0x9d0 [ 28.215434] [] ? __fget_light+0xa1/0x1e0 [ 28.221111] [] ? __fdget+0x18/0x20 [ 28.226268] [] ? sockfd_lookup_light+0x118/0x160 [ 28.232649] [] __sys_sendmsg+0xd3/0x190 [ 28.238243] [] ? SyS_shutdown+0x1b0/0x1b0 [ 28.244017] [] ? compat_SyS_futex+0x1f9/0x2a0 [ 28.250139] [] ? __do_page_fault+0x380/0xa00 [ 28.256167] [] compat_SyS_sendmsg+0x2a/0x40 [ 28.262122] [] ? compat_SyS_getsockopt+0x2a0/0x2a0 [ 28.268675] [] do_fast_syscall_32+0x314/0x890 [ 28.274802] [