[....] 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[ 23.229170] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.219059] random: sshd: uninitialized urandom read (32 bytes read) [ 26.447977] random: sshd: uninitialized urandom read (32 bytes read) [ 26.969461] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.15.203' (ECDSA) to the list of known hosts. [ 32.838006] urandom_read: 1 callbacks suppressed [ 32.838011] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.938993] ------------[ cut here ]------------ [ 32.943864] AppArmor WARN apparmor_secid_to_secctx: ((!secdata)): [ 32.944032] WARNING: CPU: 1 PID: 4679 at security/apparmor/secid.c:82 apparmor_secid_to_secctx+0x2b5/0x2f0 [ 32.960098] Kernel panic - not syncing: panic_on_warn set ... [ 32.960098] [ 32.967455] CPU: 1 PID: 4679 Comm: syz-executor939 Not tainted 4.19.0-rc1+ #76 [ 32.974882] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.984215] Call Trace: [ 32.986790] dump_stack+0x1c9/0x2b4 [ 32.990402] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.995589] panic+0x238/0x4e7 [ 32.998770] ? add_taint.cold.5+0x16/0x16 [ 33.002904] ? __warn.cold.8+0x148/0x1ba [ 33.006946] ? __warn.cold.8+0x117/0x1ba [ 33.010993] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 33.016011] __warn.cold.8+0x163/0x1ba [ 33.019885] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 33.024888] report_bug+0x252/0x2d0 [ 33.028500] do_error_trap+0x1fc/0x4d0 [ 33.032375] ? math_error+0x3e0/0x3e0 [ 33.036166] ? vprintk_default+0x28/0x30 [ 33.040213] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.045040] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 33.050043] ? printk+0xa7/0xcf [ 33.053322] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.058161] do_invalid_op+0x1b/0x20 [ 33.061858] invalid_op+0x14/0x20 [ 33.065298] RIP: 0010:apparmor_secid_to_secctx+0x2b5/0x2f0 [ 33.070921] Code: c7 c7 40 66 58 87 e8 ba 6d 0f fe 0f 0b e9 6c fe ff ff e8 8e aa 44 fe 48 c7 c6 80 67 58 87 48 c7 c7 a0 65 58 87 e8 9b 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 [ 33.089810] RSP: 0018:ffff8801c754ed10 EFLAGS: 00010286 [ 33.095163] RAX: 0000000000000000 RBX: ffff8801c754eed0 RCX: 0000000000000000 [ 33.102433] RDX: 0000000000000000 RSI: ffffffff8163ac01 RDI: 0000000000000001 [ 33.109689] RBP: ffff8801c754ed30 R08: ffff8801b6a28180 R09: ffffed003b623eca [ 33.116944] R10: ffffed003b623eca R11: ffff8801db11f657 R12: 0000000000000001 [ 33.124197] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801c754eed0 [ 33.131470] ? vprintk_func+0x81/0x117 [ 33.135361] security_secid_to_secctx+0x63/0xc0 [ 33.140021] ctnetlink_conntrack_event+0x303/0x1470 [ 33.145024] ? ctnetlink_glue_build+0xc40/0xc40 [ 33.149676] ? lock_acquire+0x1e4/0x4f0 [ 33.153636] ? nf_conntrack_eventmask_report+0xaf/0x930 [ 33.158998] ? __lock_is_held+0xb5/0x140 [ 33.163063] nf_conntrack_eventmask_report+0x55f/0x930 [ 33.168331] ? nf_ct_expect_register_notifier+0x250/0x250 [ 33.173859] ? mark_held_locks+0xc9/0x160 [ 33.177997] ? __local_bh_enable_ip+0x161/0x230 [ 33.182649] ? lockdep_hardirqs_on+0x421/0x5c0 [ 33.187219] nf_ct_delete+0x33c/0x5d0 [ 33.191012] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 33.196101] ? nf_ct_delete_from_lists+0x6f0/0x6f0 [ 33.201026] ? nf_ct_iterate_cleanup+0x42e/0x5e0 [ 33.205768] nf_ct_iterate_cleanup+0x48c/0x5e0 [ 33.210352] ? nf_ct_alloc_hashtable+0x150/0x150 [ 33.215102] ? nf_ct_gc_expired+0x4a0/0x4a0 [ 33.219409] ? find_held_lock+0x36/0x1c0 [ 33.223460] nf_ct_iterate_cleanup_net+0x23c/0x2d0 [ 33.228377] ? nf_ct_iterate_cleanup+0x5e0/0x5e0 [ 33.233131] ? ctnetlink_glue_seqadj+0x90/0x90 [ 33.237703] ctnetlink_del_conntrack+0x66c/0x850 [ 33.242533] ? lock_downgrade+0x840/0x8f0 [ 33.246672] ? ctnetlink_dump_table+0x1590/0x1590 [ 33.251500] ? __lock_is_held+0xb5/0x140 [ 33.255554] ? ctnetlink_dump_table+0x1590/0x1590 [ 33.260391] nfnetlink_rcv_msg+0xd88/0x1070 [ 33.264705] ? nfnetlink_bind+0x3b0/0x3b0 [ 33.268850] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.274378] ? refcount_sub_and_test_checked+0x21a/0x350 [ 33.279812] ? refcount_inc_not_zero_checked+0x2f0/0x2f0 [ 33.285266] ? apparmor_cred_prepare+0x590/0x590 [ 33.290005] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.295526] netlink_rcv_skb+0x172/0x440 [ 33.299583] ? nfnetlink_bind+0x3b0/0x3b0 [ 33.303721] ? netlink_ack+0xbe0/0xbe0 [ 33.307602] ? __netlink_ns_capable+0x100/0x130 [ 33.312257] nfnetlink_rcv+0x1c0/0x4d0 [ 33.316130] ? nfnetlink_rcv_batch+0x1900/0x1900 [ 33.320872] ? kasan_check_write+0x14/0x20 [ 33.325092] netlink_unicast+0x5a0/0x760 [ 33.329138] ? netlink_attachskb+0x9a0/0x9a0 [ 33.333530] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.339056] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 33.344060] netlink_sendmsg+0xa18/0xfc0 [ 33.348107] ? netlink_unicast+0x760/0x760 [ 33.352357] ? aa_sock_msg_perm.isra.13+0xba/0x160 [ 33.357275] ? apparmor_socket_sendmsg+0x29/0x30 [ 33.362026] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.367567] ? security_socket_sendmsg+0x94/0xc0 [ 33.372309] ? netlink_unicast+0x760/0x760 [ 33.376530] sock_sendmsg+0xd5/0x120 [ 33.380249] ___sys_sendmsg+0x7fd/0x930 [ 33.384213] ? copy_msghdr_from_user+0x580/0x580 [ 33.388952] ? graph_lock+0x170/0x170 [ 33.392742] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.398266] ? __fget_light+0x2f7/0x440 [ 33.402231] ? fget_raw+0x20/0x20 [ 33.405675] ? __do_page_fault+0x620/0xe50 [ 33.409897] ? lock_downgrade+0x8f0/0x8f0 [ 33.414036] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.419565] ? sockfd_lookup_light+0xc5/0x160 [ 33.424053] __sys_sendmsg+0x11d/0x290 [ 33.427944] ? __ia32_sys_shutdown+0x80/0x80 [ 33.432344] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.437876] ? __do_page_fault+0x449/0xe50 [ 33.442108] ? do_syscall_64+0x9a/0x820 [ 33.446066] ? do_syscall_64+0x9a/0x820 [ 33.450043] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 33.455134] __x64_sys_sendmsg+0x78/0xb0 [ 33.459186] do_syscall_64+0x1b9/0x820 [ 33.463056] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 33.468414] ? syscall_return_slowpath+0x5e0/0x5e0 [ 33.473326] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.478153] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 33.483160] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 33.488162] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.493685] ? prepare_exit_to_usermode+0x291/0x3b0 [ 33.498689] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.503521] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.508703] RIP: 0033:0x440f19 [ 33.511880] 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 [ 33.530779] RSP: 002b:00007fff5934eba8 EFLAGS: 00000213 ORIG_RAX: 000000000000002e [ 33.538473] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440f19 [ 33.545725] RDX: 0000000000000000 RSI: 0000000020d65000 RDI: 0000000000000003 [ 33.552976] RBP: 0000000000000000 R08: 00000000004002c8 R09: 00000000004002c8 [ 33.560228] R10: 00000000020bb880 R11: 0000000000000213 R12: 0000000000401e60 [ 33.567480] R13: 0000000000401ef0 R14: 0000000000000000 R15: 0000000000000000 [ 33.575202] Dumping ftrace buffer: [ 33.578797] (ftrace buffer empty) [ 33.582492] Kernel Offset: disabled [ 33.586100] Rebooting in 86400 seconds..