[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.340245] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.378083] random: sshd: uninitialized urandom read (32 bytes read) [ 27.711533] random: sshd: uninitialized urandom read (32 bytes read) [ 28.265198] random: sshd: uninitialized urandom read (32 bytes read) [ 28.438563] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.57' (ECDSA) to the list of known hosts. [ 34.128121] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 34.227284] ------------[ cut here ]------------ [ 34.232150] AppArmor WARN apparmor_secid_to_secctx: ((!secdata)): [ 34.232303] WARNING: CPU: 0 PID: 4619 at security/apparmor/secid.c:82 apparmor_secid_to_secctx+0x2b5/0x2f0 [ 34.248467] Kernel panic - not syncing: panic_on_warn set ... [ 34.248467] [ 34.255815] CPU: 0 PID: 4619 Comm: syz-executor549 Not tainted 4.19.0-rc1-next-20180829+ #51 [ 34.264371] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.273706] Call Trace: [ 34.276287] dump_stack+0x1c9/0x2b4 [ 34.279902] ? dump_stack_print_info.cold.2+0x52/0x52 [ 34.285099] panic+0x238/0x4e7 [ 34.288312] ? add_taint.cold.5+0x16/0x16 [ 34.292459] ? __warn.cold.8+0x148/0x1ba [ 34.296504] ? __warn.cold.8+0x117/0x1ba [ 34.300553] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 34.305583] __warn.cold.8+0x163/0x1ba [ 34.309458] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 34.314474] report_bug+0x252/0x2d0 [ 34.318090] do_error_trap+0x1fc/0x4d0 [ 34.321967] ? math_error+0x3e0/0x3e0 [ 34.325759] ? vprintk_default+0x28/0x30 [ 34.329810] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.334636] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 34.339641] ? printk+0xa7/0xcf [ 34.342912] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.347752] do_invalid_op+0x1b/0x20 [ 34.351454] invalid_op+0x14/0x20 [ 34.354893] RIP: 0010:apparmor_secid_to_secctx+0x2b5/0x2f0 [ 34.360526] 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 [ 34.379633] RSP: 0018:ffff8801bc606d10 EFLAGS: 00010286 [ 34.384984] RAX: 0000000000000000 RBX: ffff8801bc606ed0 RCX: 0000000000000000 [ 34.392244] RDX: 0000000000000000 RSI: ffffffff8163ac01 RDI: 0000000000000001 [ 34.399533] RBP: ffff8801bc606d30 R08: ffff8801bc4bc280 R09: ffffed003b603eca [ 34.406803] R10: ffffed003b603eca R11: ffff8801db01f657 R12: 0000000000000001 [ 34.414056] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801bc606ed0 [ 34.421428] ? vprintk_func+0x81/0x117 [ 34.425317] security_secid_to_secctx+0x63/0xc0 [ 34.429983] ctnetlink_conntrack_event+0x303/0x1470 [ 34.434994] ? ctnetlink_glue_build+0xc40/0xc40 [ 34.439657] ? lock_acquire+0x1e4/0x4f0 [ 34.443616] ? nf_conntrack_eventmask_report+0xaf/0x930 [ 34.448969] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 34.453731] ? __lock_is_held+0xb5/0x140 [ 34.457798] nf_conntrack_eventmask_report+0x55f/0x930 [ 34.463075] ? nf_ct_expect_register_notifier+0x250/0x250 [ 34.468610] ? mark_held_locks+0xc9/0x160 [ 34.472762] ? __local_bh_enable_ip+0x161/0x230 [ 34.477425] ? lockdep_hardirqs_on+0x421/0x5c0 [ 34.482290] nf_ct_delete+0x33c/0x5d0 [ 34.486082] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 34.491178] ? nf_ct_delete_from_lists+0x6f0/0x6f0 [ 34.496094] ? nf_ct_iterate_cleanup+0x42e/0x5e0 [ 34.500847] nf_ct_iterate_cleanup+0x48c/0x5e0 [ 34.505427] ? nf_ct_alloc_hashtable+0x150/0x150 [ 34.510168] ? nf_ct_gc_expired+0x4a0/0x4a0 [ 34.514473] ? find_held_lock+0x36/0x1c0 [ 34.518524] nf_ct_iterate_cleanup_net+0x23c/0x2d0 [ 34.523440] ? nf_ct_iterate_cleanup+0x5e0/0x5e0 [ 34.528199] ? ctnetlink_glue_seqadj+0x90/0x90 [ 34.532805] ctnetlink_del_conntrack+0x66c/0x850 [ 34.537563] ? lock_downgrade+0x840/0x8f0 [ 34.541710] ? ctnetlink_dump_table+0x1590/0x1590 [ 34.546541] ? __lock_is_held+0xb5/0x140 [ 34.550592] ? ctnetlink_dump_table+0x1590/0x1590 [ 34.555420] nfnetlink_rcv_msg+0xd88/0x1070 [ 34.559763] ? nfnetlink_bind+0x3b0/0x3b0 [ 34.563944] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.569477] ? refcount_sub_and_test_checked+0x21a/0x350 [ 34.574920] ? refcount_inc_not_zero_checked+0x2f0/0x2f0 [ 34.580381] ? apparmor_cred_prepare+0x590/0x590 [ 34.585140] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.590667] netlink_rcv_skb+0x172/0x440 [ 34.594719] ? nfnetlink_bind+0x3b0/0x3b0 [ 34.598855] ? netlink_ack+0xbe0/0xbe0 [ 34.602731] ? __netlink_ns_capable+0x100/0x130 [ 34.607386] nfnetlink_rcv+0x1c0/0x4d0 [ 34.611271] ? nfnetlink_rcv_batch+0x1900/0x1900 [ 34.616039] ? kasan_check_write+0x14/0x20 [ 34.620264] netlink_unicast+0x5a0/0x760 [ 34.624329] ? netlink_attachskb+0x9a0/0x9a0 [ 34.628726] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.634248] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 34.639399] netlink_sendmsg+0xa18/0xfc0 [ 34.643448] ? netlink_unicast+0x760/0x760 [ 34.647670] ? aa_sock_msg_perm.isra.13+0xba/0x160 [ 34.652596] ? apparmor_socket_sendmsg+0x29/0x30 [ 34.657339] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.662862] ? security_socket_sendmsg+0x94/0xc0 [ 34.667610] ? netlink_unicast+0x760/0x760 [ 34.671834] sock_sendmsg+0xd5/0x120 [ 34.675533] ___sys_sendmsg+0x7fd/0x930 [ 34.679503] ? copy_msghdr_from_user+0x580/0x580 [ 34.684242] ? graph_lock+0x170/0x170 [ 34.688042] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.693564] ? __fget_light+0x2f7/0x440 [ 34.697525] ? fget_raw+0x20/0x20 [ 34.700992] ? __do_page_fault+0x620/0xe50 [ 34.705214] ? lock_downgrade+0x8f0/0x8f0 [ 34.709349] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 34.714867] ? sockfd_lookup_light+0xc5/0x160 [ 34.719351] __sys_sendmsg+0x11d/0x290 [ 34.723238] ? __ia32_sys_shutdown+0x80/0x80 [ 34.727634] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.733154] ? __do_page_fault+0x449/0xe50 [ 34.737379] ? do_syscall_64+0x9a/0x820 [ 34.741352] ? do_syscall_64+0x9a/0x820 [ 34.745314] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 34.750408] __x64_sys_sendmsg+0x78/0xb0 [ 34.754459] do_syscall_64+0x1b9/0x820 [ 34.758332] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 34.763692] ? syscall_return_slowpath+0x5e0/0x5e0 [ 34.768612] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.773437] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 34.778453] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 34.783460] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.789027] ? prepare_exit_to_usermode+0x291/0x3b0 [ 34.794051] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.798881] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 34.804054] RIP: 0033:0x440f19 [ 34.807231] 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 [ 34.826114] RSP: 002b:00007fffd2d3e188 EFLAGS: 00000213 ORIG_RAX: 000000000000002e [ 34.833806] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440f19 [ 34.841059] RDX: 0000000000000000 RSI: 0000000020d65000 RDI: 0000000000000003 [ 34.848312] RBP: 0000000000000000 R08: 00000000004002c8 R09: 00000000004002c8 [ 34.855562] R10: 0000000001d78880 R11: 0000000000000213 R12: 0000000000401e60 [ 34.862815] R13: 0000000000401ef0 R14: 0000000000000000 R15: 0000000000000000 [ 34.870637] Dumping ftrace buffer: [ 34.874226] (ftrace buffer empty) [ 34.877921] Kernel Offset: disabled [ 34.881536] Rebooting in 86400 seconds..