[....] Starting OpenBSD Secure Shell server: sshd[ 22.392915] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.781843] random: sshd: uninitialized urandom read (32 bytes read) [ 28.163154] sshd (4641) used greatest stack depth: 16856 bytes left [ 28.183583] random: sshd: uninitialized urandom read (32 bytes read) [ 28.753559] random: sshd: uninitialized urandom read (32 bytes read) [ 28.933435] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.2' (ECDSA) to the list of known hosts. [ 34.680771] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 34.793045] ------------[ cut here ]------------ [ 34.797898] AppArmor WARN apparmor_secid_to_secctx: ((!secdata)): [ 34.798045] WARNING: CPU: 1 PID: 4658 at security/apparmor/secid.c:82 apparmor_secid_to_secctx+0x2b5/0x2f0 [ 34.814114] Kernel panic - not syncing: panic_on_warn set ... [ 34.814114] [ 34.821473] CPU: 1 PID: 4658 Comm: syz-executor892 Not tainted 4.19.0-rc1+ #214 [ 34.828998] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.838335] Call Trace: [ 34.840933] dump_stack+0x1c9/0x2b4 [ 34.844635] ? dump_stack_print_info.cold.2+0x52/0x52 [ 34.849830] panic+0x238/0x4e7 [ 34.853069] ? add_taint.cold.5+0x16/0x16 [ 34.857212] ? __warn.cold.8+0x148/0x1ba [ 34.861274] ? __warn.cold.8+0x117/0x1ba [ 34.865432] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 34.870438] __warn.cold.8+0x163/0x1ba [ 34.874338] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 34.879342] report_bug+0x252/0x2d0 [ 34.882973] do_error_trap+0x1fc/0x4d0 [ 34.886846] ? math_error+0x3e0/0x3e0 [ 34.890635] ? vprintk_default+0x28/0x30 [ 34.894731] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.899565] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 34.904685] ? printk+0xa7/0xcf [ 34.907966] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.912903] do_invalid_op+0x1b/0x20 [ 34.916649] invalid_op+0x14/0x20 [ 34.920100] RIP: 0010:apparmor_secid_to_secctx+0x2b5/0x2f0 [ 34.925716] Code: c7 c7 c0 66 58 87 e8 0a 6c 0f fe 0f 0b e9 6c fe ff ff e8 de a8 44 fe 48 c7 c6 00 68 58 87 48 c7 c7 20 66 58 87 e8 eb 6b 0f fe <0f> 0b e9 3f fe ff ff 48 89 df e8 9c a6 83 fe e9 ed fe ff ff bb f4 [ 34.944600] RSP: 0018:ffff8801bafb6d10 EFLAGS: 00010286 [ 34.949994] RAX: 0000000000000000 RBX: ffff8801bafb6ed0 RCX: 0000000000000000 [ 34.957265] RDX: 0000000000000000 RSI: ffffffff8163ac01 RDI: 0000000000000001 [ 34.964526] RBP: ffff8801bafb6d30 R08: ffff8801be6e0680 R09: ffffed003b623eca [ 34.971780] R10: ffffed003b623eca R11: ffff8801db11f657 R12: 0000000000000001 [ 34.979052] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801bafb6ed0 [ 34.986322] ? vprintk_func+0x81/0x117 [ 34.990204] security_secid_to_secctx+0x63/0xc0 [ 34.994863] ctnetlink_conntrack_event+0x303/0x1470 [ 34.999869] ? trace_hardirqs_on_caller+0xc0/0x2b0 [ 35.004791] ? ctnetlink_glue_build+0xc40/0xc40 [ 35.009446] ? lock_acquire+0x1e4/0x4f0 [ 35.013427] ? nf_conntrack_eventmask_report+0xaf/0x930 [ 35.018782] ? __lock_is_held+0xb5/0x140 [ 35.022853] nf_conntrack_eventmask_report+0x55f/0x930 [ 35.028134] ? nf_ct_expect_register_notifier+0x250/0x250 [ 35.033655] ? mark_held_locks+0xc9/0x160 [ 35.037801] ? __local_bh_enable_ip+0x161/0x230 [ 35.042451] ? lockdep_hardirqs_on+0x421/0x5c0 [ 35.047023] nf_ct_delete+0x33c/0x5d0 [ 35.050815] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 35.055907] ? nf_ct_delete_from_lists+0x6f0/0x6f0 [ 35.060826] ? nf_ct_iterate_cleanup+0x42e/0x5e0 [ 35.065570] nf_ct_iterate_cleanup+0x48c/0x5e0 [ 35.070141] ? nf_ct_alloc_hashtable+0x150/0x150 [ 35.074882] ? nf_ct_gc_expired+0x4a0/0x4a0 [ 35.079296] nf_ct_iterate_cleanup_net+0x23c/0x2d0 [ 35.084235] ? nf_ct_iterate_cleanup+0x5e0/0x5e0 [ 35.088993] ? ctnetlink_glue_seqadj+0x90/0x90 [ 35.093570] ctnetlink_del_conntrack+0x66c/0x850 [ 35.098314] ? lock_downgrade+0x840/0x8f0 [ 35.102450] ? ctnetlink_dump_table+0x1590/0x1590 [ 35.107292] ? __lock_is_held+0xb5/0x140 [ 35.111349] ? ctnetlink_dump_table+0x1590/0x1590 [ 35.116311] nfnetlink_rcv_msg+0xd88/0x1070 [ 35.120626] ? nfnetlink_bind+0x3b0/0x3b0 [ 35.124766] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.130294] ? refcount_sub_and_test_checked+0x21a/0x350 [ 35.135751] ? refcount_inc_not_zero_checked+0x2f0/0x2f0 [ 35.141213] ? apparmor_cred_prepare+0x590/0x590 [ 35.145961] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.151499] netlink_rcv_skb+0x172/0x440 [ 35.155549] ? nfnetlink_bind+0x3b0/0x3b0 [ 35.159782] ? netlink_ack+0xbe0/0xbe0 [ 35.163806] ? __netlink_ns_capable+0x100/0x130 [ 35.168491] nfnetlink_rcv+0x1c0/0x4d0 [ 35.172367] ? nfnetlink_rcv_batch+0x1900/0x1900 [ 35.177121] ? kasan_check_write+0x14/0x20 [ 35.181350] netlink_unicast+0x5a0/0x760 [ 35.185402] ? netlink_attachskb+0x9a0/0x9a0 [ 35.189801] ? netlink_sendmsg+0x74f/0xfc0 [ 35.194031] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 35.199047] netlink_sendmsg+0xa18/0xfc0 [ 35.203100] ? netlink_unicast+0x760/0x760 [ 35.207323] ? aa_sock_msg_perm.isra.13+0xba/0x160 [ 35.212259] ? apparmor_socket_sendmsg+0x29/0x30 [ 35.217018] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.222557] ? security_socket_sendmsg+0x94/0xc0 [ 35.227303] ? netlink_unicast+0x760/0x760 [ 35.231531] sock_sendmsg+0xd5/0x120 [ 35.235253] ___sys_sendmsg+0x7fd/0x930 [ 35.239238] ? copy_msghdr_from_user+0x580/0x580 [ 35.243997] ? graph_lock+0x170/0x170 [ 35.247794] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.253418] ? __fget_light+0x2f7/0x440 [ 35.257386] ? fget_raw+0x20/0x20 [ 35.260832] ? __do_page_fault+0x620/0xe50 [ 35.265055] ? lock_downgrade+0x8f0/0x8f0 [ 35.269211] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 35.274746] ? sockfd_lookup_light+0xc5/0x160 [ 35.279231] __sys_sendmsg+0x11d/0x290 [ 35.283190] ? __ia32_sys_shutdown+0x80/0x80 [ 35.287606] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.293130] ? __do_page_fault+0x449/0xe50 [ 35.297354] ? do_syscall_64+0x9a/0x820 [ 35.301316] ? do_syscall_64+0x9a/0x820 [ 35.305286] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 35.310383] __x64_sys_sendmsg+0x78/0xb0 [ 35.314437] do_syscall_64+0x1b9/0x820 [ 35.318320] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 35.323724] ? syscall_return_slowpath+0x5e0/0x5e0 [ 35.328729] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.333575] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 35.338590] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 35.343597] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.349118] ? prepare_exit_to_usermode+0x291/0x3b0 [ 35.354148] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.358996] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.364191] RIP: 0033:0x440f19 [ 35.367452] 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 [ 35.386346] RSP: 002b:00007ffd7a4e3658 EFLAGS: 00000213 ORIG_RAX: 000000000000002e [ 35.394043] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440f19 [ 35.401299] RDX: 0000000000000000 RSI: 0000000020d65000 RDI: 0000000000000003 [ 35.408554] RBP: 0000000000000000 R08: 00000000004002c8 R09: 00000000004002c8 [ 35.415849] R10: 0000000001349880 R11: 0000000000000213 R12: 0000000000401e60 [ 35.423108] R13: 0000000000401ef0 R14: 0000000000000000 R15: 0000000000000000 [ 35.430772] Dumping ftrace buffer: [ 35.434363] (ftrace buffer empty) [ 35.438056] Kernel Offset: disabled [ 35.441670] Rebooting in 86400 seconds..