[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 23.269986] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 23.599463] random: sshd: uninitialized urandom read (32 bytes read) [ 23.854058] random: sshd: uninitialized urandom read (32 bytes read) [ 24.478929] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.659157] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.12' (ECDSA) to the list of known hosts. [ 30.228460] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.339384] ------------[ cut here ]------------ [ 30.344217] AppArmor WARN apparmor_secid_to_secctx: ((!secdata)): [ 30.344389] WARNING: CPU: 1 PID: 4673 at security/apparmor/secid.c:82 apparmor_secid_to_secctx+0x2b5/0x2f0 [ 30.360455] Kernel panic - not syncing: panic_on_warn set ... [ 30.360455] [ 30.367810] CPU: 1 PID: 4673 Comm: syz-executor935 Not tainted 4.19.0-rc1+ #193 [ 30.375249] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.384582] Call Trace: [ 30.387157] dump_stack+0x1c9/0x2b4 [ 30.390782] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.395979] panic+0x238/0x4e7 [ 30.399199] ? add_taint.cold.5+0x16/0x16 [ 30.403337] ? __warn.cold.8+0x148/0x1ba [ 30.407386] ? __warn.cold.8+0x117/0x1ba [ 30.411436] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 30.416437] __warn.cold.8+0x163/0x1ba [ 30.420309] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 30.425312] report_bug+0x252/0x2d0 [ 30.428927] do_error_trap+0x1fc/0x4d0 [ 30.432814] ? math_error+0x3e0/0x3e0 [ 30.436618] ? vprintk_default+0x28/0x30 [ 30.440666] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.445492] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 30.450492] ? printk+0xa7/0xcf [ 30.453762] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.458619] do_invalid_op+0x1b/0x20 [ 30.462328] invalid_op+0x14/0x20 [ 30.465776] RIP: 0010:apparmor_secid_to_secctx+0x2b5/0x2f0 [ 30.471398] Code: c7 c7 40 66 58 87 e8 6a 6d 0f fe 0f 0b e9 6c fe ff ff e8 3e aa 44 fe 48 c7 c6 80 67 58 87 48 c7 c7 a0 65 58 87 e8 4b 6d 0f fe <0f> 0b e9 3f fe ff ff 48 89 df e8 fc a7 83 fe e9 ed fe ff ff bb f4 [ 30.490281] RSP: 0018:ffff8801b72a6d10 EFLAGS: 00010286 [ 30.495627] RAX: 0000000000000000 RBX: ffff8801b72a6ed0 RCX: 0000000000000000 [ 30.502882] RDX: 0000000000000000 RSI: ffffffff8163ac01 RDI: 0000000000000001 [ 30.510137] RBP: ffff8801b72a6d30 R08: ffff8801b811e480 R09: ffffed003b623eca [ 30.517428] R10: ffffed003b623eca R11: ffff8801db11f657 R12: 0000000000000001 [ 30.524685] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801b72a6ed0 [ 30.531948] ? vprintk_func+0x81/0x117 [ 30.535841] security_secid_to_secctx+0x63/0xc0 [ 30.540512] ctnetlink_conntrack_event+0x303/0x1470 [ 30.545519] ? ctnetlink_glue_build+0xc40/0xc40 [ 30.550175] ? lock_acquire+0x1e4/0x4f0 [ 30.554136] ? nf_conntrack_eventmask_report+0xaf/0x930 [ 30.559486] ? __lock_is_held+0xb5/0x140 [ 30.563561] nf_conntrack_eventmask_report+0x55f/0x930 [ 30.568836] ? nf_ct_expect_register_notifier+0x250/0x250 [ 30.574367] ? mark_held_locks+0xc9/0x160 [ 30.578502] ? __local_bh_enable_ip+0x161/0x230 [ 30.583164] ? lockdep_hardirqs_on+0x421/0x5c0 [ 30.587754] nf_ct_delete+0x33c/0x5d0 [ 30.591561] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 30.596676] ? nf_ct_delete_from_lists+0x6f0/0x6f0 [ 30.601607] ? nf_ct_iterate_cleanup+0x42e/0x5e0 [ 30.606357] nf_ct_iterate_cleanup+0x48c/0x5e0 [ 30.610928] ? nf_ct_alloc_hashtable+0x150/0x150 [ 30.615687] ? nf_ct_gc_expired+0x4a0/0x4a0 [ 30.620020] ? find_held_lock+0x36/0x1c0 [ 30.624106] nf_ct_iterate_cleanup_net+0x23c/0x2d0 [ 30.629023] ? nf_ct_iterate_cleanup+0x5e0/0x5e0 [ 30.633780] ? ctnetlink_glue_seqadj+0x90/0x90 [ 30.638367] ctnetlink_del_conntrack+0x66c/0x850 [ 30.643115] ? lock_downgrade+0x840/0x8f0 [ 30.647248] ? ctnetlink_dump_table+0x1590/0x1590 [ 30.652077] ? __lock_is_held+0xb5/0x140 [ 30.656130] ? ctnetlink_dump_table+0x1590/0x1590 [ 30.660959] nfnetlink_rcv_msg+0xd88/0x1070 [ 30.665274] ? nfnetlink_bind+0x3b0/0x3b0 [ 30.669411] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.674933] ? refcount_sub_and_test_checked+0x21a/0x350 [ 30.680372] ? refcount_inc_not_zero_checked+0x2f0/0x2f0 [ 30.685830] ? apparmor_cred_prepare+0x590/0x590 [ 30.690593] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.696123] netlink_rcv_skb+0x172/0x440 [ 30.700169] ? nfnetlink_bind+0x3b0/0x3b0 [ 30.704302] ? netlink_ack+0xbe0/0xbe0 [ 30.708181] ? __netlink_ns_capable+0x100/0x130 [ 30.712837] nfnetlink_rcv+0x1c0/0x4d0 [ 30.716718] ? nfnetlink_rcv_batch+0x1900/0x1900 [ 30.721460] ? kasan_check_write+0x14/0x20 [ 30.725684] netlink_unicast+0x5a0/0x760 [ 30.729734] ? netlink_attachskb+0x9a0/0x9a0 [ 30.734128] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.739650] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 30.744654] netlink_sendmsg+0xa18/0xfc0 [ 30.748702] ? netlink_unicast+0x760/0x760 [ 30.752923] ? aa_sock_msg_perm.isra.13+0xba/0x160 [ 30.757861] ? apparmor_socket_sendmsg+0x29/0x30 [ 30.762603] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.768125] ? security_socket_sendmsg+0x94/0xc0 [ 30.772869] ? netlink_unicast+0x760/0x760 [ 30.777100] sock_sendmsg+0xd5/0x120 [ 30.780813] ___sys_sendmsg+0x7fd/0x930 [ 30.784794] ? copy_msghdr_from_user+0x580/0x580 [ 30.789546] ? graph_lock+0x170/0x170 [ 30.793338] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.798868] ? __fget_light+0x2f7/0x440 [ 30.802838] ? fget_raw+0x20/0x20 [ 30.806301] ? __do_page_fault+0x620/0xe50 [ 30.810521] ? lock_downgrade+0x8f0/0x8f0 [ 30.814662] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.820180] ? sockfd_lookup_light+0xc5/0x160 [ 30.824659] __sys_sendmsg+0x11d/0x290 [ 30.828538] ? __ia32_sys_shutdown+0x80/0x80 [ 30.832936] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.838459] ? __do_page_fault+0x449/0xe50 [ 30.842683] ? do_syscall_64+0x9a/0x820 [ 30.846643] ? do_syscall_64+0x9a/0x820 [ 30.850618] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 30.855721] __x64_sys_sendmsg+0x78/0xb0 [ 30.859822] do_syscall_64+0x1b9/0x820 [ 30.863760] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 30.869161] ? syscall_return_slowpath+0x5e0/0x5e0 [ 30.874121] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.878963] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 30.883964] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 30.888966] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.894505] ? prepare_exit_to_usermode+0x291/0x3b0 [ 30.899509] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.904337] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.909524] RIP: 0033:0x440f19 [ 30.912701] Code: e8 cc ab 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 bb 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 30.931586] RSP: 002b:00007ffc49bf21c8 EFLAGS: 00000213 ORIG_RAX: 000000000000002e [ 30.939291] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440f19 [ 30.946649] RDX: 0000000000000000 RSI: 0000000020d65000 RDI: 0000000000000003 [ 30.953902] RBP: 0000000000000000 R08: 00000000004002c8 R09: 00000000004002c8 [ 30.961156] R10: 0000000001c51880 R11: 0000000000000213 R12: 0000000000401e60 [ 30.968408] R13: 0000000000401ef0 R14: 0000000000000000 R15: 0000000000000000 [ 30.976100] Dumping ftrace buffer: [ 30.979688] (ftrace buffer empty) [ 30.983381] Kernel Offset: disabled [ 30.986989] Rebooting in 86400 seconds..