[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 23.406474] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.106332] random: sshd: uninitialized urandom read (32 bytes read) [ 26.321008] random: sshd: uninitialized urandom read (32 bytes read) [ 26.872530] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.15.204' (ECDSA) to the list of known hosts. [ 32.740321] urandom_read: 1 callbacks suppressed [ 32.740326] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.845147] ------------[ cut here ]------------ [ 32.849990] AppArmor WARN apparmor_secid_to_secctx: ((!secdata)): [ 32.850144] WARNING: CPU: 1 PID: 4658 at security/apparmor/secid.c:82 apparmor_secid_to_secctx+0x2b5/0x2f0 [ 32.866209] Kernel panic - not syncing: panic_on_warn set ... [ 32.866209] [ 32.873556] CPU: 1 PID: 4658 Comm: syz-executor035 Not tainted 4.19.0-rc1-next-20180829+ #51 [ 32.882125] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.891459] Call Trace: [ 32.894050] dump_stack+0x1c9/0x2b4 [ 32.897662] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.902841] panic+0x238/0x4e7 [ 32.906025] ? add_taint.cold.5+0x16/0x16 [ 32.910160] ? __warn.cold.8+0x148/0x1ba [ 32.914203] ? __warn.cold.8+0x117/0x1ba [ 32.918248] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 32.923245] __warn.cold.8+0x163/0x1ba [ 32.927116] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 32.932114] report_bug+0x252/0x2d0 [ 32.935724] do_error_trap+0x1fc/0x4d0 [ 32.939605] ? math_error+0x3e0/0x3e0 [ 32.943400] ? vprintk_default+0x28/0x30 [ 32.947447] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.952272] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 32.957285] ? printk+0xa7/0xcf [ 32.960589] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.965429] do_invalid_op+0x1b/0x20 [ 32.969130] invalid_op+0x14/0x20 [ 32.972565] RIP: 0010:apparmor_secid_to_secctx+0x2b5/0x2f0 [ 32.978184] 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 [ 32.997077] RSP: 0018:ffff8801b4d3ed10 EFLAGS: 00010286 [ 33.002450] RAX: 0000000000000000 RBX: ffff8801b4d3eed0 RCX: 0000000000000000 [ 33.009703] RDX: 0000000000000000 RSI: ffffffff8163ac01 RDI: 0000000000000001 [ 33.016959] RBP: ffff8801b4d3ed30 R08: ffff8801b8dde000 R09: ffffed003b623eca [ 33.024213] R10: ffffed003b623eca R11: ffff8801db11f657 R12: 0000000000000001 [ 33.031483] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801b4d3eed0 [ 33.038761] ? vprintk_func+0x81/0x117 [ 33.042642] security_secid_to_secctx+0x63/0xc0 [ 33.047301] ctnetlink_conntrack_event+0x303/0x1470 [ 33.052302] ? trace_hardirqs_on_caller+0xc0/0x2b0 [ 33.057220] ? ctnetlink_glue_build+0xc40/0xc40 [ 33.061870] ? lock_acquire+0x1e4/0x4f0 [ 33.065825] ? nf_conntrack_eventmask_report+0xaf/0x930 [ 33.071189] ? __lock_is_held+0xb5/0x140 [ 33.075253] nf_conntrack_eventmask_report+0x55f/0x930 [ 33.080516] ? nf_ct_expect_register_notifier+0x250/0x250 [ 33.086039] ? mark_held_locks+0xc9/0x160 [ 33.090173] ? __local_bh_enable_ip+0x161/0x230 [ 33.094830] ? lockdep_hardirqs_on+0x421/0x5c0 [ 33.099403] nf_ct_delete+0x33c/0x5d0 [ 33.103188] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 33.108273] ? nf_ct_delete_from_lists+0x6f0/0x6f0 [ 33.113187] ? nf_ct_iterate_cleanup+0x42e/0x5e0 [ 33.117942] nf_ct_iterate_cleanup+0x48c/0x5e0 [ 33.122514] ? nf_ct_alloc_hashtable+0x150/0x150 [ 33.127271] ? nf_ct_gc_expired+0x4a0/0x4a0 [ 33.131581] ? find_held_lock+0x36/0x1c0 [ 33.135632] nf_ct_iterate_cleanup_net+0x23c/0x2d0 [ 33.140548] ? nf_ct_iterate_cleanup+0x5e0/0x5e0 [ 33.145289] ? ctnetlink_glue_seqadj+0x90/0x90 [ 33.149865] ctnetlink_del_conntrack+0x66c/0x850 [ 33.154605] ? lock_downgrade+0x840/0x8f0 [ 33.158740] ? ctnetlink_dump_table+0x1590/0x1590 [ 33.163588] ? __lock_is_held+0xb5/0x140 [ 33.167636] ? ctnetlink_dump_table+0x1590/0x1590 [ 33.172462] nfnetlink_rcv_msg+0xd88/0x1070 [ 33.176788] ? nfnetlink_bind+0x3b0/0x3b0 [ 33.180953] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.186479] ? refcount_sub_and_test_checked+0x21a/0x350 [ 33.191921] ? refcount_inc_not_zero_checked+0x2f0/0x2f0 [ 33.197378] ? apparmor_cred_prepare+0x590/0x590 [ 33.202134] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.207659] netlink_rcv_skb+0x172/0x440 [ 33.211704] ? nfnetlink_bind+0x3b0/0x3b0 [ 33.215843] ? netlink_ack+0xbe0/0xbe0 [ 33.219718] ? __netlink_ns_capable+0x100/0x130 [ 33.224378] nfnetlink_rcv+0x1c0/0x4d0 [ 33.228254] ? nfnetlink_rcv_batch+0x1900/0x1900 [ 33.232995] ? kasan_check_write+0x14/0x20 [ 33.237235] netlink_unicast+0x5a0/0x760 [ 33.241282] ? netlink_attachskb+0x9a0/0x9a0 [ 33.245681] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.251203] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 33.256208] netlink_sendmsg+0xa18/0xfc0 [ 33.260271] ? netlink_unicast+0x760/0x760 [ 33.264502] ? aa_sock_msg_perm.isra.13+0xba/0x160 [ 33.269414] ? apparmor_socket_sendmsg+0x29/0x30 [ 33.274152] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.279671] ? security_socket_sendmsg+0x94/0xc0 [ 33.284419] ? netlink_unicast+0x760/0x760 [ 33.288652] sock_sendmsg+0xd5/0x120 [ 33.292349] ___sys_sendmsg+0x7fd/0x930 [ 33.296313] ? copy_msghdr_from_user+0x580/0x580 [ 33.301053] ? graph_lock+0x170/0x170 [ 33.304866] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.310390] ? __fget_light+0x2f7/0x440 [ 33.314351] ? fget_raw+0x20/0x20 [ 33.317799] ? __do_page_fault+0x620/0xe50 [ 33.322027] ? lock_downgrade+0x8f0/0x8f0 [ 33.326166] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.331687] ? sockfd_lookup_light+0xc5/0x160 [ 33.336170] __sys_sendmsg+0x11d/0x290 [ 33.340046] ? __ia32_sys_shutdown+0x80/0x80 [ 33.344453] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.349974] ? __do_page_fault+0x449/0xe50 [ 33.354196] ? do_syscall_64+0x9a/0x820 [ 33.358157] ? do_syscall_64+0x9a/0x820 [ 33.362118] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 33.367207] __x64_sys_sendmsg+0x78/0xb0 [ 33.371267] do_syscall_64+0x1b9/0x820 [ 33.375139] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 33.380488] ? syscall_return_slowpath+0x5e0/0x5e0 [ 33.385403] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.390255] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 33.395250] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 33.400248] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.405803] ? prepare_exit_to_usermode+0x291/0x3b0 [ 33.410812] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.415646] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.420815] RIP: 0033:0x441189 [ 33.423990] 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 [ 33.442878] RSP: 002b:00007ffd2e9a65a8 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 33.450585] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441189 [ 33.457847] RDX: 0000000000000000 RSI: 0000000020d65000 RDI: 0000000000000004 [ 33.465100] RBP: 0000000000000000 R08: 00000000004002c8 R09: 00000000004002c8 [ 33.472351] R10: 00000000004002c8 R11: 0000000000000217 R12: 00000000004020d0 [ 33.479601] R13: 0000000000402160 R14: 0000000000000000 R15: 0000000000000000 [ 33.487317] Dumping ftrace buffer: [ 33.490949] (ftrace buffer empty) [ 33.494647] Kernel Offset: disabled [ 33.498286] Rebooting in 86400 seconds..