[....] 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[ 23.135762] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.751422] random: sshd: uninitialized urandom read (32 bytes read) [ 24.995468] random: sshd: uninitialized urandom read (32 bytes read) [ 25.557719] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.10' (ECDSA) to the list of known hosts. [ 31.316179] urandom_read: 1 callbacks suppressed [ 31.316185] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.427643] ------------[ cut here ]------------ [ 31.432509] AppArmor WARN apparmor_secid_to_secctx: ((!secdata)): [ 31.432674] WARNING: CPU: 0 PID: 4671 at security/apparmor/secid.c:82 apparmor_secid_to_secctx+0x2b5/0x2f0 [ 31.448744] Kernel panic - not syncing: panic_on_warn set ... [ 31.448744] [ 31.456091] CPU: 0 PID: 4671 Comm: syz-executor355 Not tainted 4.19.0-rc1+ #76 [ 31.463432] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.472765] Call Trace: [ 31.475349] dump_stack+0x1c9/0x2b4 [ 31.478964] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.484142] panic+0x238/0x4e7 [ 31.487319] ? add_taint.cold.5+0x16/0x16 [ 31.491456] ? __warn.cold.8+0x148/0x1ba [ 31.495512] ? __warn.cold.8+0x117/0x1ba [ 31.499581] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 31.504582] __warn.cold.8+0x163/0x1ba [ 31.508473] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 31.513477] report_bug+0x252/0x2d0 [ 31.517094] do_error_trap+0x1fc/0x4d0 [ 31.520986] ? math_error+0x3e0/0x3e0 [ 31.524783] ? vprintk_default+0x28/0x30 [ 31.528854] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.533694] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 31.538693] ? printk+0xa7/0xcf [ 31.541962] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.546798] do_invalid_op+0x1b/0x20 [ 31.550511] invalid_op+0x14/0x20 [ 31.553954] RIP: 0010:apparmor_secid_to_secctx+0x2b5/0x2f0 [ 31.559566] 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 [ 31.578451] RSP: 0018:ffff8801b6ebed10 EFLAGS: 00010286 [ 31.583806] RAX: 0000000000000000 RBX: ffff8801b6ebeed0 RCX: 0000000000000000 [ 31.591071] RDX: 0000000000000000 RSI: ffffffff8163ac01 RDI: 0000000000000001 [ 31.598325] RBP: ffff8801b6ebed30 R08: ffff8801b68381c0 R09: ffffed003b603eca [ 31.605578] R10: ffffed003b603eca R11: ffff8801db01f657 R12: 0000000000000001 [ 31.612839] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801b6ebeed0 [ 31.620116] ? vprintk_func+0x81/0x117 [ 31.623995] security_secid_to_secctx+0x63/0xc0 [ 31.628661] ctnetlink_conntrack_event+0x303/0x1470 [ 31.633672] ? ctnetlink_glue_build+0xc40/0xc40 [ 31.638327] ? lock_acquire+0x1e4/0x4f0 [ 31.642291] ? nf_conntrack_eventmask_report+0xaf/0x930 [ 31.647642] ? __lock_is_held+0xb5/0x140 [ 31.651695] nf_conntrack_eventmask_report+0x55f/0x930 [ 31.656961] ? nf_ct_expect_register_notifier+0x250/0x250 [ 31.662483] ? mark_held_locks+0xc9/0x160 [ 31.666620] ? __local_bh_enable_ip+0x161/0x230 [ 31.671280] ? lockdep_hardirqs_on+0x421/0x5c0 [ 31.675855] nf_ct_delete+0x33c/0x5d0 [ 31.679641] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 31.684741] ? nf_ct_delete_from_lists+0x6f0/0x6f0 [ 31.689670] ? nf_ct_iterate_cleanup+0x42e/0x5e0 [ 31.694417] nf_ct_iterate_cleanup+0x48c/0x5e0 [ 31.698999] ? nf_ct_alloc_hashtable+0x150/0x150 [ 31.703758] ? nf_ct_gc_expired+0x4a0/0x4a0 [ 31.708081] ? find_held_lock+0x36/0x1c0 [ 31.712146] nf_ct_iterate_cleanup_net+0x23c/0x2d0 [ 31.717061] ? nf_ct_iterate_cleanup+0x5e0/0x5e0 [ 31.721812] ? ctnetlink_glue_seqadj+0x90/0x90 [ 31.726426] ctnetlink_del_conntrack+0x66c/0x850 [ 31.731176] ? lock_downgrade+0x840/0x8f0 [ 31.735322] ? ctnetlink_dump_table+0x1590/0x1590 [ 31.740159] ? __lock_is_held+0xb5/0x140 [ 31.744218] ? ctnetlink_dump_table+0x1590/0x1590 [ 31.749058] nfnetlink_rcv_msg+0xd88/0x1070 [ 31.753370] ? nfnetlink_bind+0x3b0/0x3b0 [ 31.757531] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.763081] ? refcount_sub_and_test_checked+0x21a/0x350 [ 31.768535] ? refcount_inc_not_zero_checked+0x2f0/0x2f0 [ 31.773985] ? apparmor_cred_prepare+0x590/0x590 [ 31.778726] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.784250] netlink_rcv_skb+0x172/0x440 [ 31.788303] ? nfnetlink_bind+0x3b0/0x3b0 [ 31.792436] ? netlink_ack+0xbe0/0xbe0 [ 31.796318] ? __netlink_ns_capable+0x100/0x130 [ 31.800980] nfnetlink_rcv+0x1c0/0x4d0 [ 31.804864] ? nfnetlink_rcv_batch+0x1900/0x1900 [ 31.809617] ? kasan_check_write+0x14/0x20 [ 31.813843] netlink_unicast+0x5a0/0x760 [ 31.817893] ? netlink_attachskb+0x9a0/0x9a0 [ 31.822292] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.827828] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 31.832854] netlink_sendmsg+0xa18/0xfc0 [ 31.836939] ? netlink_unicast+0x760/0x760 [ 31.841165] ? aa_sock_msg_perm.isra.13+0xba/0x160 [ 31.846083] ? apparmor_socket_sendmsg+0x29/0x30 [ 31.850845] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.856398] ? security_socket_sendmsg+0x94/0xc0 [ 31.861146] ? netlink_unicast+0x760/0x760 [ 31.865369] sock_sendmsg+0xd5/0x120 [ 31.869098] ___sys_sendmsg+0x7fd/0x930 [ 31.873071] ? copy_msghdr_from_user+0x580/0x580 [ 31.877836] ? graph_lock+0x170/0x170 [ 31.881630] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.887169] ? __fget_light+0x2f7/0x440 [ 31.891131] ? fget_raw+0x20/0x20 [ 31.894576] ? __do_page_fault+0x620/0xe50 [ 31.898811] ? lock_downgrade+0x8f0/0x8f0 [ 31.902961] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.908500] ? sockfd_lookup_light+0xc5/0x160 [ 31.912991] __sys_sendmsg+0x11d/0x290 [ 31.916878] ? __ia32_sys_shutdown+0x80/0x80 [ 31.921287] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.926820] ? __do_page_fault+0x449/0xe50 [ 31.931048] ? do_syscall_64+0x9a/0x820 [ 31.935391] ? do_syscall_64+0x9a/0x820 [ 31.939354] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 31.944446] __x64_sys_sendmsg+0x78/0xb0 [ 31.948496] do_syscall_64+0x1b9/0x820 [ 31.952377] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 31.957726] ? syscall_return_slowpath+0x5e0/0x5e0 [ 31.962638] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.967470] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 31.972484] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 31.977493] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.983029] ? prepare_exit_to_usermode+0x291/0x3b0 [ 31.988049] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.992885] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.998066] RIP: 0033:0x441189 [ 32.001243] 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 [ 32.020148] RSP: 002b:00007ffdcd6db428 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 32.027842] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441189 [ 32.035095] RDX: 0000000000000000 RSI: 0000000020d65000 RDI: 0000000000000004 [ 32.042349] RBP: 0000000000000000 R08: 00000000004002c8 R09: 00000000004002c8 [ 32.049607] R10: 00000000004002c8 R11: 0000000000000217 R12: 00000000004020d0 [ 32.056875] R13: 0000000000402160 R14: 0000000000000000 R15: 0000000000000000 [ 32.064568] Dumping ftrace buffer: [ 32.068163] (ftrace buffer empty) [ 32.071856] Kernel Offset: disabled [ 32.075468] Rebooting in 86400 seconds..