[ 18.743005] random: sshd: uninitialized urandom read (32 bytes read, 32 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. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.061065] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.369199] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 23.275114] random: sshd: uninitialized urandom read (32 bytes read, 128 bits of entropy available) [ 23.367318] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.17' (ECDSA) to the list of known hosts. 2018/02/20 05:57:21 parsed 1 programs 2018/02/20 05:57:21 executed programs: 0 [ 29.148361] IPVS: Creating netns size=2552 id=1 [ 29.831431] BUG: using __this_cpu_add() in preemptible [00000000] code: syz-executor0/3882 [ 29.839863] caller is __this_cpu_preempt_check+0x1c/0x20 [ 29.846741] CPU: 0 PID: 3882 Comm: syz-executor0 Not tainted 4.4.115-g55a366596 #15 [ 29.854517] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.863841] 0000000000000000 7853c73e5668ec57 ffff8800ba9976c0 ffffffff81d03d8d [ 29.871819] 0000000000000000 ffffffff839fe4a0 ffffffff83cef860 ffff8800af30e000 [ 29.880260] 0000000000000003 ffff8800ba997700 ffffffff81d63cd4 ffffffff81237470 [ 29.888228] Call Trace: [ 29.890792] [] dump_stack+0xc1/0x124 [ 29.896139] [] check_preemption_disabled+0x1d4/0x200 [ 29.902875] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 29.909858] [] __this_cpu_preempt_check+0x1c/0x20 [ 29.916320] [] tcp_try_rmem_schedule+0xf2/0x1180 [ 29.922698] [] ? skb_put+0x149/0x1c0 [ 29.928035] [] tcp_send_rcvq+0x1ba/0x450 [ 29.933728] [] ? tcp_rcv_established+0x2230/0x2230 [ 29.940278] [] ? tcp_sendmsg+0xb3/0x2b10 [ 29.945959] [] ? lock_sock_nested+0xa2/0x120 [ 29.951988] [] ? lock_sock_nested+0x90/0x120 [ 29.958017] [] ? trace_hardirqs_on+0xd/0x10 [ 29.963958] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 29.970249] [] tcp_sendmsg+0x1e8f/0x2b10 [ 29.975928] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 29.982911] [] ? sock_has_perm+0x1c1/0x400 [ 29.988765] [] ? tcp_sendpage+0x1830/0x1830 [ 29.994707] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 30.001775] [] ? inet_sendmsg+0x73/0x4c0 [ 30.007454] [] ? move_addr_to_kernel.part.12+0xc5/0x110 [ 30.014436] [] ? inet_sendmsg+0x201/0x4c0 [ 30.020200] [] inet_sendmsg+0x2bc/0x4c0 [ 30.025791] [] ? inet_sendmsg+0x73/0x4c0 [ 30.031474] [] ? inet_recvmsg+0x4c0/0x4c0 [ 30.037241] [] sock_sendmsg+0xca/0x110 [ 30.042748] [] ___sys_sendmsg+0x6c1/0x7c0 [ 30.048516] [] ? copy_msghdr_from_user+0x550/0x550 [ 30.055065] [] ? release_pages+0x1f7/0x4f0 [ 30.060922] [] ? __this_cpu_preempt_check+0x1c/0x20 [ 30.067560] [] ? do_futex+0x3f4/0x15d0 [ 30.073068] [] ? __wake_up_locked_key+0x20/0x20 [ 30.079356] [] ? exit_robust_list+0x240/0x240 [ 30.085471] [] ? filemap_map_pages+0x508/0x9d0 [ 30.091671] [] ? filemap_map_pages+0x10a/0x9d0 [ 30.097874] [] ? __fget_light+0xa1/0x1e0 [ 30.103552] [] ? __fdget+0x18/0x20 [ 30.108711] [] ? sockfd_lookup_light+0x118/0x160 [ 30.115086] [] __sys_sendmsg+0xd3/0x190 [ 30.120677] [] ? SyS_shutdown+0x1b0/0x1b0 [ 30.126442] [] ? compat_SyS_futex+0x1f9/0x2a0 [ 30.132557] [] ? __do_page_fault+0x380/0xa00 [ 30.138586] [] compat_SyS_sendmsg+0x2a/0x40 [ 30.144525] [] ? compat_SyS_getsockopt+0x2a0/0x2a0 [ 30.151076] [] do_fast_syscall_32+0x314/0x890 [ 30.157194] [] sysenter_flags_fixed+0xd/0x17 [ 30.163280] BUG: using __this_cpu_add() in preemptible [00000000] code: syz-executor0/3882 [ 30.171878] caller is __this_cpu_preempt_check+0x1c/0x20 [ 30.177301] CPU: 0 PID: 3882 Comm: syz-executor0 Not tainted 4.4.115-g55a366596 #15 [ 30.185060] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.194384] 0000000000000000 7853c73e5668ec57 ffff8800ba9976c0 ffffffff81d03d8d [ 30.202353] 0000000000000000 ffffffff839fe4a0 ffffffff83cef860 ffff8800af30e000 [ 30.210325] 0000000000000003 ffff8800ba997700 ffffffff81d63cd4 ffffffff8313163a [ 30.218301] Call Trace: [ 30.220864] [] dump_stack+0xc1/0x124 [ 30.226201] [] check_preemption_disabled+0x1d4/0x200 [ 30.232927] [] ? tcp_prune_ofo_queue+0x30a/0x420 [ 30.239306] [] __this_cpu_preempt_check+0x1c/0x20 [ 30.245768] [] tcp_try_rmem_schedule+0xe33/0x1180 [ 30.252230] [] tcp_send_rcvq+0x1ba/0x450 [ 30.257908] [] ? tcp_rcv_established+0x2230/0x2230 [ 30.264456] [] ? tcp_sendmsg+0xb3/0x2b10 [ 30.270149] [] ? lock_sock_nested+0xa2/0x120 [ 30.276175] [] ? lock_sock_nested+0x90/0x120 [ 30.282205] [] ? trace_hardirqs_on+0xd/0x10 [ 30.288149] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 30.294437] [] tcp_sendmsg+0x1e8f/0x2b10 [ 30.300115] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 30.307114] [] ? sock_has_perm+0x1c1/0x400 [ 30.312969] [] ? tcp_sendpage+0x1830/0x1830 [ 30.318909] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 30.325981] [] ? inet_sendmsg+0x73/0x4c0 [ 30.331665] [] ? move_addr_to_kernel.part.12+0xc5/0x110 [ 30.338651] [] ? inet_sendmsg+0x201/0x4c0 [ 30.344420] [] inet_sendmsg+0x2bc/0x4c0 [ 30.350013] [] ? inet_sendmsg+0x73/0x4c0 [ 30.355695] [] ? inet_recvmsg+0x4c0/0x4c0 [ 30.361473] [] sock_sendmsg+0xca/0x110 [ 30.366979] [] ___sys_sendmsg+0x6c1/0x7c0 [ 30.372747] [] ? copy_msghdr_from_user+0x550/0x550 [ 30.379294] [] ? release_pages+0x1f7/0x4f0 [ 30.385148] [] ? __this_cpu_preempt_check+0x1c/0x20 [ 30.391785] [] ? do_futex+0x3f4/0x15d0 [ 30.397291] [] ? __wake_up_locked_key+0x20/0x20 [ 30.403576] [] ? exit_robust_list+0x240/0x240 [ 30.409718] [] ? filemap_map_pages+0x508/0x9d0 [ 30.415917] [] ? filemap_map_pages+0x10a/0x9d0 [ 30.422130] [] ? __fget_light+0xa1/0x1e0 [ 30.427807] [] ? __fdget+0x18/0x20 [ 30.432968] [] ? sockfd_lookup_light+0x118/0x160 [ 30.439339] [] __sys_sendmsg+0xd3/0x190 [ 30.444935] [] ? SyS_shutdown+0x1b0/0x1b0 [ 30.450701] [] ? compat_SyS_futex+0x1f9/0x2a0 [ 30.456815] [] ? __do_page_fault+0x380/0xa00 [ 30.462840] [] compat_SyS_sendmsg+0x2a/0x40 [ 30.468777] [] ? compat_SyS_getsockopt+0x2a0/0x2a0 [ 30.475323] [] do_fast_syscall_32+0x314/0x890 [ 30.481435] [