[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.872111] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 23.048955] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 23.327907] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.405564] random: sshd: uninitialized urandom read (32 bytes read, 123 bits of entropy available) [ 26.725565] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.15' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 62.278032] BUG: using __this_cpu_add() in preemptible [00000000] code: syzkaller923016/5299 [ 62.287046] caller is __this_cpu_preempt_check+0x1c/0x20 [ 62.292512] CPU: 0 PID: 5299 Comm: syzkaller923016 Not tainted 4.4.114-g4e74e98 #5 [ 62.300214] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.309649] 0000000000000000 bfab85adf8ab8103 ffff8800aa7376c8 ffffffff81d03d2d [ 62.317697] 0000000000000000 ffffffff839fe3a0 ffffffff83cef720 ffff8801d38a9800 [ 62.325717] 0000000000000003 ffff8800aa737708 ffffffff81d63c74 ffffffff810002b8 [ 62.333742] Call Trace: [ 62.336315] [] dump_stack+0xc1/0x124 [ 62.341668] [] check_preemption_disabled+0x1d4/0x200 [ 62.348406] [] ? 0xffffffff810002b8 [ 62.353685] [] __this_cpu_preempt_check+0x1c/0x20 [ 62.360343] [] tcp_try_coalesce+0x249/0x4d0 [ 62.366314] [] ? tcp_parse_options+0x970/0x970 executing program executing program executing program executing program executing program executing program executing program executing program [ 62.372558] [] ? skb_copy_datagram_from_iter+0x38c/0x5a0 [ 62.379661] [] tcp_queue_rcv+0x127/0x720 [ 62.385365] [] tcp_send_rcvq+0x39b/0x450 [ 62.391076] [] ? tcp_rcv_established+0x2230/0x2230 [ 62.397658] [] ? do_softirq.part.17+0x40/0x60 [ 62.403807] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 62.410648] [] ? lock_sock_nested+0x90/0x120 [ 62.416718] [] ? trace_hardirqs_on+0xd/0x10 executing program executing program executing program [ 62.422695] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 62.429013] [] tcp_sendmsg+0x1e8f/0x2b10 [ 62.434724] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 62.441736] [] ? sock_has_perm+0x1c2/0x3e0 [ 62.447618] [] ? tcp_sendpage+0x1830/0x1830 [ 62.453589] [] ? inet_sendmsg+0x201/0x4c0 [ 62.459384] [] inet_sendmsg+0x2bc/0x4c0 [ 62.465005] [] ? inet_sendmsg+0x73/0x4c0 [ 62.470721] [] ? inet_recvmsg+0x4c0/0x4c0 executing program executing program [ 62.476544] [] sock_sendmsg+0xca/0x110 [ 62.482091] [] ___sys_sendmsg+0x6c1/0x7c0 [ 62.487891] [] ? copy_msghdr_from_user+0x550/0x550 [ 62.494471] [] ? __fget+0x232/0x3b0 [ 62.499742] [] ? __fget+0x47/0x3b0 [ 62.504935] [] ? __fget_light+0xa1/0x1e0 [ 62.510647] [] ? __fdget+0x18/0x20 [ 62.515829] [] __sys_sendmsg+0xd3/0x190 [ 62.521458] [] ? SyS_shutdown+0x1b0/0x1b0 executing program executing program executing program executing program executing program [ 62.527254] [] ? __do_page_fault+0x380/0xa00 [ 62.533308] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 62.540159] [] SyS_sendmsg+0x2d/0x50 [ 62.545539] [] entry_SYSCALL_64_fastpath+0x1c/0x98 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 62.843655] BUG: using __this_cpu_add() in preemptible [00000000] code: syzkaller923016/5460 [ 62.852431] caller is __this_cpu_preempt_check+0x1c/0x20 [ 62.857956] CPU: 1 PID: 5460 Comm: syzkaller923016 Not tainted 4.4.114-g4e74e98 #5 [ 62.865659] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.875011] 0000000000000000 224f5a243efd0488 ffff8800b60676c8 ffffffff81d03d2d [ 62.883056] 0000000000000001 ffffffff839fe3a0 ffffffff83cef720 ffff8800b6819800 [ 62.891083] 0000000000000003 ffff8800b6067708 ffffffff81d63c74 ffffffff810002b8 [ 62.899142] Call Trace: [ 62.901717] [] dump_stack+0xc1/0x124 [ 62.907195] [] check_preemption_disabled+0x1d4/0x200 [ 62.913944] [] ? 0xffffffff810002b8 [ 62.919220] [] __this_cpu_preempt_check+0x1c/0x20 [ 62.925722] [] tcp_try_coalesce+0x249/0x4d0 [ 62.931692] [] ? tcp_parse_options+0x970/0x970 [ 62.937921] [] ? skb_copy_datagram_from_iter+0x38c/0x5a0 [ 62.945030] [] tcp_queue_rcv+0x127/0x720 [ 62.950736] [] tcp_send_rcvq+0x39b/0x450 [ 62.956440] [] ? tcp_rcv_established+0x2230/0x2230 [ 62.963014] [] ? do_softirq.part.17+0x40/0x60 [ 62.969153] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 62.975986] [] ? lock_sock_nested+0x90/0x120 [ 62.982048] [] ? trace_hardirqs_on+0xd/0x10 [ 62.988012] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 62.994324] [] tcp_sendmsg+0x1e8f/0x2b10 [ 63.000031] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 63.007047] [] ? sock_has_perm+0x1c2/0x3e0 [ 63.012926] [] ? tcp_sendpage+0x1830/0x1830 [ 63.018901] [] ? inet_sendmsg+0x201/0x4c0 [ 63.024708] [] inet_sendmsg+0x2bc/0x4c0 [ 63.030326] [] ? inet_sendmsg+0x73/0x4c0 [ 63.036029] [] ? inet_recvmsg+0x4c0/0x4c0 [ 63.041821] [] sock_sendmsg+0xca/0x110 [ 63.047361] [] ___sys_sendmsg+0x6c1/0x7c0 [ 63.053165] [] ? copy_msghdr_from_user+0x550/0x550 [ 63.059747] [] ? __fget+0x232/0x3b0 [ 63.065035] [] ? __fget+0x47/0x3b0 [ 63.070223] [] ? __fget_light+0xa1/0x1e0 [ 63.075935] [] ? __fdget+0x18/0x20 [ 63.081118] [] __sys_sendmsg+0xd3/0x190 [ 63.086738] [] ? SyS_shutdown+0x1b0/0x1b0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 63.092533] [] ? __do_page_fault+0x380/0xa00 [ 63.098589] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 63.105430] [] SyS_sendmsg+0x2d/0x50 [ 63.110802] [] entry_SYSCALL_64_fastpath+0x1c/0x98 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 66.819045] BUG: using __this_cpu_add() in preemptible [00000000] code: syzkaller923016/6742 [ 66.827930] caller is __this_cpu_preempt_check+0x1c/0x20 [ 66.833663] CPU: 1 PID: 6742 Comm: syzkaller923016 Not tainted 4.4.114-g4e74e98 #5 [ 66.841361] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.850714] 0000000000000000 16b6d38d6d993585 ffff8800b55cf6c8 ffffffff81d03d2d [ 66.858757] 0000000000000001 ffffffff839fe3a0 ffffffff83cef720 ffff8801d04f4800 [ 66.866784] 0000000000000003 ffff8800b55cf708 ffffffff81d63c74 ffffffff810002b8 [ 66.874813] Call Trace: [ 66.877391] [] dump_stack+0xc1/0x124 [ 66.882746] [] check_preemption_disabled+0x1d4/0x200 [ 66.889486] [] ? 0xffffffff810002b8 [ 66.894775] [] __this_cpu_preempt_check+0x1c/0x20 [ 66.901264] [] tcp_try_coalesce+0x249/0x4d0 [ 66.907228] [] ? tcp_parse_options+0x970/0x970 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 66.913460] [] ? skb_copy_datagram_from_iter+0x38c/0x5a0 [ 66.920556] [] tcp_queue_rcv+0x127/0x720 [ 66.926265] [] tcp_send_rcvq+0x39b/0x450 [ 66.931976] [] ? tcp_rcv_established+0x2230/0x2230 [ 66.938550] [] ? do_softirq.part.17+0x40/0x60 [ 66.944689] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 66.951521] [] ? lock_sock_nested+0x90/0x120 [ 66.957591] [] ? trace_hardirqs_on+0xd/0x10 [ 66.963569] [] ? __local_bh_enable_ip+0x6a/0xd0 executing program executing program executing program [ 66.969889] [] tcp_sendmsg+0x1e8f/0x2b10 [ 66.975596] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 66.982615] [] ? sock_has_perm+0x1c2/0x3e0 [ 66.988501] [] ? tcp_sendpage+0x1830/0x1830 [ 66.994466] [] ? inet_sendmsg+0x201/0x4c0 [ 67.000254] [] inet_sendmsg+0x2bc/0x4c0 [ 67.005868] [] ? inet_sendmsg+0x73/0x4c0 [ 67.011572] [] ? inet_recvmsg+0x4c0/0x4c0 executing program executing program executing program [ 67.017370] [] sock_sendmsg+0xca/0x110 [ 67.022912] [] ___sys_sendmsg+0x6c1/0x7c0 [ 67.028715] [] ? copy_msghdr_from_user+0x550/0x550 [ 67.035294] [] ? __fget+0x232/0x3b0 [ 67.040574] [] ? __fget+0x47/0x3b0 [ 67.045757] [] ? __fget_light+0xa1/0x1e0 [ 67.051462] [] ? __fdget+0x18/0x20 [ 67.056648] [] __sys_sendmsg+0xd3/0x190 [ 67.062266] [] ? SyS_shutdown+0x1b0/0x1b0 executing program executing program executing program [ 67.068055] [] ? __do_page_fault+0x380/0xa00 [ 67.074117] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 67.080967] [] SyS_sendmsg+0x2d/0x50 [ 67.086336] [] entry_SYSCALL_64_fastpath+0x1c/0x98 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program