[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 24.024648] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.960849] random: sshd: uninitialized urandom read (32 bytes read) [ 29.314470] random: sshd: uninitialized urandom read (32 bytes read) [ 29.867832] random: sshd: uninitialized urandom read (32 bytes read) [ 30.051574] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.23' (ECDSA) to the list of known hosts. [ 35.739509] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 35.840293] ------------[ cut here ]------------ [ 35.845200] AppArmor WARN apparmor_secid_to_secctx: ((!secdata)): [ 35.845365] WARNING: CPU: 0 PID: 4682 at security/apparmor/secid.c:82 apparmor_secid_to_secctx+0x2b5/0x2f0 [ 35.861428] Kernel panic - not syncing: panic_on_warn set ... [ 35.861428] [ 35.868773] CPU: 0 PID: 4682 Comm: syz-executor028 Not tainted 4.19.0-rc1+ #193 [ 35.876201] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.885538] Call Trace: [ 35.888119] dump_stack+0x1c9/0x2b4 [ 35.891733] ? dump_stack_print_info.cold.2+0x52/0x52 [ 35.896909] panic+0x238/0x4e7 [ 35.900085] ? add_taint.cold.5+0x16/0x16 [ 35.904221] ? __warn.cold.8+0x148/0x1ba [ 35.908261] ? __warn.cold.8+0x117/0x1ba [ 35.912364] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 35.917370] __warn.cold.8+0x163/0x1ba [ 35.921245] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 35.926245] report_bug+0x252/0x2d0 [ 35.929854] do_error_trap+0x1fc/0x4d0 [ 35.933721] ? math_error+0x3e0/0x3e0 [ 35.937503] ? vprintk_default+0x28/0x30 [ 35.941544] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.946483] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 35.951490] ? printk+0xa7/0xcf [ 35.954756] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.959674] do_invalid_op+0x1b/0x20 [ 35.963393] invalid_op+0x14/0x20 [ 35.966856] RIP: 0010:apparmor_secid_to_secctx+0x2b5/0x2f0 [ 35.972467] Code: c7 c7 40 66 58 87 e8 6a 6d 0f fe 0f 0b e9 6c fe ff ff e8 3e aa 44 fe 48 c7 c6 80 67 58 87 48 c7 c7 a0 65 58 87 e8 4b 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 [ 35.991364] RSP: 0018:ffff8801ba5a6d10 EFLAGS: 00010286 [ 35.996715] RAX: 0000000000000000 RBX: ffff8801ba5a6ed0 RCX: 0000000000000000 [ 36.003968] RDX: 0000000000000000 RSI: ffffffff8163ac01 RDI: 0000000000000001 [ 36.011220] RBP: ffff8801ba5a6d30 R08: ffff8801d9ba2580 R09: ffffed003b603eca [ 36.018477] R10: ffffed003b603eca R11: ffff8801db01f657 R12: 0000000000000001 [ 36.025736] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801ba5a6ed0 [ 36.033025] ? vprintk_func+0x81/0x117 [ 36.036911] security_secid_to_secctx+0x63/0xc0 [ 36.041570] ctnetlink_conntrack_event+0x303/0x1470 [ 36.046578] ? ctnetlink_glue_build+0xc40/0xc40 [ 36.051236] ? lock_acquire+0x1e4/0x4f0 [ 36.055198] ? nf_conntrack_eventmask_report+0xaf/0x930 [ 36.060549] ? __lock_is_held+0xb5/0x140 [ 36.064747] nf_conntrack_eventmask_report+0x55f/0x930 [ 36.070038] ? nf_ct_expect_register_notifier+0x250/0x250 [ 36.075578] ? mark_held_locks+0xc9/0x160 [ 36.079719] ? __local_bh_enable_ip+0x161/0x230 [ 36.084387] ? lockdep_hardirqs_on+0x421/0x5c0 [ 36.089019] nf_ct_delete+0x33c/0x5d0 [ 36.092816] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 36.097915] ? nf_ct_delete_from_lists+0x6f0/0x6f0 [ 36.102881] ? nf_ct_iterate_cleanup+0x42e/0x5e0 [ 36.107647] nf_ct_iterate_cleanup+0x48c/0x5e0 [ 36.112278] ? nf_ct_alloc_hashtable+0x150/0x150 [ 36.117029] ? nf_ct_gc_expired+0x4a0/0x4a0 [ 36.121348] ? find_held_lock+0x36/0x1c0 [ 36.125408] nf_ct_iterate_cleanup_net+0x23c/0x2d0 [ 36.130345] ? nf_ct_iterate_cleanup+0x5e0/0x5e0 [ 36.135226] ? ctnetlink_glue_seqadj+0x90/0x90 [ 36.139809] ctnetlink_del_conntrack+0x66c/0x850 [ 36.144553] ? lock_downgrade+0x840/0x8f0 [ 36.148697] ? ctnetlink_dump_table+0x1590/0x1590 [ 36.153535] ? __lock_is_held+0xb5/0x140 [ 36.157588] ? ctnetlink_dump_table+0x1590/0x1590 [ 36.162420] nfnetlink_rcv_msg+0xd88/0x1070 [ 36.166811] ? nfnetlink_bind+0x3b0/0x3b0 [ 36.170970] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.176528] ? refcount_sub_and_test_checked+0x21a/0x350 [ 36.181983] ? refcount_inc_not_zero_checked+0x2f0/0x2f0 [ 36.187443] ? apparmor_cred_prepare+0x590/0x590 [ 36.192192] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.197721] netlink_rcv_skb+0x172/0x440 [ 36.201839] ? nfnetlink_bind+0x3b0/0x3b0 [ 36.205985] ? netlink_ack+0xbe0/0xbe0 [ 36.209892] ? __netlink_ns_capable+0x100/0x130 [ 36.214557] nfnetlink_rcv+0x1c0/0x4d0 [ 36.218435] ? nfnetlink_rcv_batch+0x1900/0x1900 [ 36.223183] ? kasan_check_write+0x14/0x20 [ 36.227409] netlink_unicast+0x5a0/0x760 [ 36.231457] ? netlink_attachskb+0x9a0/0x9a0 [ 36.235854] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.241378] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 36.246396] netlink_sendmsg+0xa18/0xfc0 [ 36.250450] ? netlink_unicast+0x760/0x760 [ 36.254671] ? aa_sock_msg_perm.isra.13+0xba/0x160 [ 36.259598] ? apparmor_socket_sendmsg+0x29/0x30 [ 36.264371] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.269963] ? security_socket_sendmsg+0x94/0xc0 [ 36.274718] ? netlink_unicast+0x760/0x760 [ 36.278948] sock_sendmsg+0xd5/0x120 [ 36.282656] ___sys_sendmsg+0x7fd/0x930 [ 36.286623] ? copy_msghdr_from_user+0x580/0x580 [ 36.291371] ? graph_lock+0x170/0x170 [ 36.295165] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.300691] ? __fget_light+0x2f7/0x440 [ 36.304726] ? fget_raw+0x20/0x20 [ 36.308180] ? __do_page_fault+0x620/0xe50 [ 36.312405] ? lock_downgrade+0x8f0/0x8f0 [ 36.316546] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 36.322071] ? sockfd_lookup_light+0xc5/0x160 [ 36.326552] __sys_sendmsg+0x11d/0x290 [ 36.330429] ? __ia32_sys_shutdown+0x80/0x80 [ 36.334827] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.340355] ? __do_page_fault+0x449/0xe50 [ 36.344585] ? do_syscall_64+0x9a/0x820 [ 36.348546] ? do_syscall_64+0x9a/0x820 [ 36.352511] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 36.357604] __x64_sys_sendmsg+0x78/0xb0 [ 36.361651] do_syscall_64+0x1b9/0x820 [ 36.365521] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 36.370883] ? syscall_return_slowpath+0x5e0/0x5e0 [ 36.375803] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.380630] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 36.385631] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 36.390633] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.396159] ? prepare_exit_to_usermode+0x291/0x3b0 [ 36.401163] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.406000] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.411173] RIP: 0033:0x441189 [ 36.414358] 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 [ 36.433259] RSP: 002b:00007ffc388e2108 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 36.440959] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441189 [ 36.448257] RDX: 0000000000000000 RSI: 0000000020d65000 RDI: 0000000000000004 [ 36.455519] RBP: 0000000000000000 R08: 00000000004002c8 R09: 00000000004002c8 [ 36.462773] R10: 00000000004002c8 R11: 0000000000000217 R12: 00000000004020d0 [ 36.470151] R13: 0000000000402160 R14: 0000000000000000 R15: 0000000000000000 [ 36.477821] Dumping ftrace buffer: [ 36.481425] (ftrace buffer empty) [ 36.485123] Kernel Offset: disabled [ 36.488782] Rebooting in 86400 seconds..