[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 23.005559] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.771546] random: sshd: uninitialized urandom read (32 bytes read) [ 26.082590] random: sshd: uninitialized urandom read (32 bytes read) [ 26.652189] random: sshd: uninitialized urandom read (32 bytes read) [ 26.828185] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.25' (ECDSA) to the list of known hosts. [ 32.482759] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.581025] ------------[ cut here ]------------ [ 32.585918] AppArmor WARN apparmor_secid_to_secctx: ((!secdata)): [ 32.586060] WARNING: CPU: 0 PID: 4668 at security/apparmor/secid.c:82 apparmor_secid_to_secctx+0x2b5/0x2f0 [ 32.602144] Kernel panic - not syncing: panic_on_warn set ... [ 32.602144] [ 32.609491] CPU: 0 PID: 4668 Comm: syz-executor496 Not tainted 4.19.0-rc1-next-20180829+ #51 [ 32.618045] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.627394] Call Trace: [ 32.629970] dump_stack+0x1c9/0x2b4 [ 32.633584] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.638780] panic+0x238/0x4e7 [ 32.641961] ? add_taint.cold.5+0x16/0x16 [ 32.646095] ? __warn.cold.8+0x148/0x1ba [ 32.650138] ? __warn.cold.8+0x117/0x1ba [ 32.654184] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 32.659184] __warn.cold.8+0x163/0x1ba [ 32.663056] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 32.668057] report_bug+0x252/0x2d0 [ 32.671671] do_error_trap+0x1fc/0x4d0 [ 32.675544] ? math_error+0x3e0/0x3e0 [ 32.679332] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.684159] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 32.689159] ? vprintk_func+0x81/0x117 [ 32.693029] ? printk+0xa7/0xcf [ 32.696295] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.701123] do_invalid_op+0x1b/0x20 [ 32.704852] invalid_op+0x14/0x20 [ 32.708292] RIP: 0010:apparmor_secid_to_secctx+0x2b5/0x2f0 [ 32.713897] Code: c7 c7 a0 a2 58 87 e8 7a a0 0d fe 0f 0b e9 6c fe ff ff e8 9e e7 42 fe 48 c7 c6 e0 a3 58 87 48 c7 c7 00 a2 58 87 e8 5b a0 0d fe <0f> 0b e9 3f fe ff ff 48 89 df e8 1c f6 81 fe e9 ed fe ff ff bb f4 [ 32.732782] RSP: 0018:ffff8801c99fef38 EFLAGS: 00010286 [ 32.738129] RAX: 0000000000000000 RBX: ffff8801c99ff0f8 RCX: 0000000000000000 [ 32.745377] RDX: 0000000000000000 RSI: ffffffff8163ac01 RDI: 0000000000000001 [ 32.752632] RBP: ffff8801c99fef58 R08: ffff8801d9474500 R09: ffffed003b603eca [ 32.759896] R10: ffffed003b603eca R11: ffff8801db01f657 R12: 0000000000000001 [ 32.767149] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801c99ff0f8 [ 32.774413] ? vprintk_func+0x81/0x117 [ 32.778286] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 32.783289] security_secid_to_secctx+0x63/0xc0 [ 32.787944] ctnetlink_conntrack_event+0x303/0x1470 [ 32.792943] ? __local_bh_enable_ip+0x161/0x230 [ 32.797595] ? __nf_conntrack_confirm+0x1293/0x34f0 [ 32.802600] ? ctnetlink_glue_build+0xc40/0xc40 [ 32.807252] ? lock_acquire+0x1e4/0x4f0 [ 32.811209] ? nf_ct_deliver_cached_events+0xa3/0x7e0 [ 32.816405] ? nf_conntrack_tuple_taken+0x1140/0x1140 [ 32.821581] ? __lock_is_held+0xb5/0x140 [ 32.825632] nf_ct_deliver_cached_events+0x4eb/0x7e0 [ 32.830734] ? nf_ct_expect_unregister_notifier+0x210/0x210 [ 32.836442] ? icmp_checkentry+0x90/0x90 [ 32.840487] ? find_held_lock+0x36/0x1c0 [ 32.844540] ipv4_confirm+0x2d5/0x500 [ 32.848327] ? nf_ct_l4proto_register_one+0x680/0x680 [ 32.853521] ? __sanitizer_cov_trace_cmp2+0x18/0x20 [ 32.858524] ? nf_nat_ipv4_out+0x35f/0x3d0 [ 32.862757] ? nf_ct_l4proto_register_one+0x680/0x680 [ 32.867943] nf_hook_slow+0xc2/0x1c0 [ 32.871645] ip_output+0x562/0x880 [ 32.875168] ? __ip_local_out+0x5e3/0xb50 [ 32.879301] ? ip_mc_output+0x15d0/0x15d0 [ 32.883437] ? ip_fragment.constprop.49+0x240/0x240 [ 32.888440] ? __ip_make_skb+0x10ff/0x1b40 [ 32.892660] ? dst_release+0x5d/0xb0 [ 32.896358] ip_local_out+0xc5/0x1b0 [ 32.900059] ip_send_skb+0x40/0xe0 [ 32.903612] udp_send_skb.isra.41+0x6b7/0x11d0 [ 32.908182] udp_push_pending_frames+0x5c/0xf0 [ 32.912748] udp_sendpage+0x3b2/0x590 [ 32.916548] ? udp_sendmsg+0x38e0/0x38e0 [ 32.920611] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 32.925612] ? ktime_get_coarse_real_ts64+0x243/0x3a0 [ 32.930791] ? udp_sendmsg+0x38e0/0x38e0 [ 32.934849] inet_sendpage+0x1de/0x750 [ 32.938739] ? inet_sendmsg+0x690/0x690 [ 32.942721] ? current_time+0x10b/0x1b0 [ 32.946703] kernel_sendpage+0x93/0xf0 [ 32.950585] ? inet_sendmsg+0x690/0x690 [ 32.954543] sock_sendpage+0x8c/0xc0 [ 32.958240] ? kernel_sendpage+0xf0/0xf0 [ 32.962286] pipe_to_sendpage+0x2d0/0x400 [ 32.966420] ? generic_pipe_buf_nosteal+0x10/0x10 [ 32.971247] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.976771] ? splice_from_pipe_next.part.9+0x296/0x340 [ 32.982124] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 32.987654] ? touch_atime+0x103/0x320 [ 32.991530] __splice_from_pipe+0x38e/0x7c0 [ 32.995842] ? generic_pipe_buf_nosteal+0x10/0x10 [ 33.000692] splice_from_pipe+0x1ea/0x340 [ 33.004861] ? add_to_pipe+0x360/0x360 [ 33.008741] ? generic_pipe_buf_nosteal+0x10/0x10 [ 33.013569] ? splice_shrink_spd+0xd0/0xd0 [ 33.017791] generic_splice_sendpage+0x3c/0x50 [ 33.022357] ? splice_from_pipe+0x340/0x340 [ 33.026675] direct_splice_actor+0x128/0x190 [ 33.031082] splice_direct_to_actor+0x318/0x8f0 [ 33.035737] ? pipe_to_sendpage+0x400/0x400 [ 33.040047] ? do_splice_to+0x190/0x190 [ 33.044017] ? security_file_permission+0x1c2/0x230 [ 33.049021] ? rw_verify_area+0x118/0x360 [ 33.053156] do_splice_direct+0x2d4/0x420 [ 33.057292] ? splice_direct_to_actor+0x8f0/0x8f0 [ 33.062117] ? apparmor_file_permission+0x24/0x30 [ 33.066946] ? rw_verify_area+0x118/0x360 [ 33.071079] do_sendfile+0x62a/0xe20 [ 33.074792] ? do_compat_pwritev64+0x1c0/0x1c0 [ 33.079380] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.084922] ? _copy_from_user+0xdf/0x150 [ 33.089056] __x64_sys_sendfile64+0x15d/0x250 [ 33.093534] ? __ia32_sys_sendfile+0x2a0/0x2a0 [ 33.098110] do_syscall_64+0x1b9/0x820 [ 33.101982] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 33.107332] ? syscall_return_slowpath+0x5e0/0x5e0 [ 33.112246] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.117073] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 33.122071] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 33.127074] ? prepare_exit_to_usermode+0x291/0x3b0 [ 33.132075] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.136906] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.142076] RIP: 0033:0x4401d9 [ 33.145252] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 33.164151] RSP: 002b:00007ffc69b432f8 EFLAGS: 00000217 ORIG_RAX: 0000000000000028 [ 33.171854] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401d9 [ 33.179108] RDX: 0000000020000080 RSI: 0000000000000004 RDI: 0000000000000003 [ 33.186360] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 33.193612] R10: 000000000000ffe4 R11: 0000000000000217 R12: 0000000000401a60 [ 33.200877] R13: 0000000000401af0 R14: 0000000000000000 R15: 0000000000000000 [ 33.208673] Dumping ftrace buffer: [ 33.212282] (ftrace buffer empty) [ 33.215974] Kernel Offset: disabled [ 33.219585] Rebooting in 86400 seconds..