[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.873164] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.954688] random: sshd: uninitialized urandom read (32 bytes read) [ 25.251998] random: sshd: uninitialized urandom read (32 bytes read) [ 25.813882] random: sshd: uninitialized urandom read (32 bytes read) [ 25.996431] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.63' (ECDSA) to the list of known hosts. [ 31.564067] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.674970] ------------[ cut here ]------------ [ 31.679959] AppArmor WARN apparmor_secid_to_secctx: ((!secdata)): [ 31.680107] WARNING: CPU: 1 PID: 4660 at security/apparmor/secid.c:82 apparmor_secid_to_secctx+0x2b5/0x2f0 [ 31.696208] Kernel panic - not syncing: panic_on_warn set ... [ 31.696208] [ 31.703579] CPU: 1 PID: 4660 Comm: syz-executor716 Not tainted 4.19.0-rc1+ #214 [ 31.711006] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.720358] Call Trace: [ 31.722933] dump_stack+0x1c9/0x2b4 [ 31.726548] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.731743] panic+0x238/0x4e7 [ 31.734926] ? add_taint.cold.5+0x16/0x16 [ 31.739064] ? __warn.cold.8+0x148/0x1ba [ 31.743110] ? __warn.cold.8+0x117/0x1ba [ 31.747169] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 31.752201] __warn.cold.8+0x163/0x1ba [ 31.756087] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 31.761091] report_bug+0x252/0x2d0 [ 31.764706] do_error_trap+0x1fc/0x4d0 [ 31.768581] ? math_error+0x3e0/0x3e0 [ 31.772372] ? vprintk_default+0x28/0x30 [ 31.776421] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.781269] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 31.786297] ? printk+0xa7/0xcf [ 31.789582] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.794419] do_invalid_op+0x1b/0x20 [ 31.798137] invalid_op+0x14/0x20 [ 31.801585] RIP: 0010:apparmor_secid_to_secctx+0x2b5/0x2f0 [ 31.807224] 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 [ 31.826123] RSP: 0018:ffff8801b9a5ed10 EFLAGS: 00010286 [ 31.831474] RAX: 0000000000000000 RBX: ffff8801b9a5eed0 RCX: 0000000000000000 [ 31.838731] RDX: 0000000000000000 RSI: ffffffff8163ac01 RDI: 0000000000000001 [ 31.846007] RBP: ffff8801b9a5ed30 R08: ffff8801b94a6780 R09: ffffed003b623eca [ 31.853264] R10: ffffed003b623eca R11: ffff8801db11f657 R12: 0000000000000001 [ 31.860530] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801b9a5eed0 [ 31.867803] ? vprintk_func+0x81/0x117 [ 31.871704] security_secid_to_secctx+0x63/0xc0 [ 31.876369] ctnetlink_conntrack_event+0x303/0x1470 [ 31.881391] ? ctnetlink_glue_build+0xc40/0xc40 [ 31.886047] ? lock_acquire+0x1e4/0x4f0 [ 31.890023] ? nf_conntrack_eventmask_report+0xaf/0x930 [ 31.895394] ? __lock_is_held+0xb5/0x140 [ 31.899451] nf_conntrack_eventmask_report+0x55f/0x930 [ 31.904735] ? nf_ct_expect_register_notifier+0x250/0x250 [ 31.910260] ? mark_held_locks+0xc9/0x160 [ 31.914412] ? __local_bh_enable_ip+0x161/0x230 [ 31.919078] ? lockdep_hardirqs_on+0x421/0x5c0 [ 31.923663] nf_ct_delete+0x33c/0x5d0 [ 31.927454] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 31.932554] ? nf_ct_delete_from_lists+0x6f0/0x6f0 [ 31.937473] ? nf_ct_iterate_cleanup+0x42e/0x5e0 [ 31.942230] nf_ct_iterate_cleanup+0x48c/0x5e0 [ 31.946810] ? nf_ct_alloc_hashtable+0x150/0x150 [ 31.951556] ? nf_ct_gc_expired+0x4a0/0x4a0 [ 31.955865] ? find_held_lock+0x36/0x1c0 [ 31.959931] nf_ct_iterate_cleanup_net+0x23c/0x2d0 [ 31.964857] ? nf_ct_iterate_cleanup+0x5e0/0x5e0 [ 31.969602] ? ctnetlink_glue_seqadj+0x90/0x90 [ 31.974195] ctnetlink_del_conntrack+0x66c/0x850 [ 31.978951] ? lock_downgrade+0x840/0x8f0 [ 31.983089] ? ctnetlink_dump_table+0x1590/0x1590 [ 31.987922] ? __lock_is_held+0xb5/0x140 [ 31.991976] ? ctnetlink_dump_table+0x1590/0x1590 [ 31.996834] nfnetlink_rcv_msg+0xd88/0x1070 [ 32.001168] ? nfnetlink_bind+0x3b0/0x3b0 [ 32.005326] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.010852] ? refcount_sub_and_test_checked+0x21a/0x350 [ 32.016304] ? refcount_inc_not_zero_checked+0x2f0/0x2f0 [ 32.021760] ? apparmor_cred_prepare+0x590/0x590 [ 32.026506] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.032037] netlink_rcv_skb+0x172/0x440 [ 32.036087] ? nfnetlink_bind+0x3b0/0x3b0 [ 32.040232] ? netlink_ack+0xbe0/0xbe0 [ 32.044121] ? __netlink_ns_capable+0x100/0x130 [ 32.048781] nfnetlink_rcv+0x1c0/0x4d0 [ 32.052665] ? nfnetlink_rcv_batch+0x1900/0x1900 [ 32.057411] ? kasan_check_write+0x14/0x20 [ 32.061650] netlink_unicast+0x5a0/0x760 [ 32.065713] ? netlink_attachskb+0x9a0/0x9a0 [ 32.070112] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.075639] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 32.080644] netlink_sendmsg+0xa18/0xfc0 [ 32.084716] ? netlink_unicast+0x760/0x760 [ 32.088957] ? aa_sock_msg_perm.isra.13+0xba/0x160 [ 32.093879] ? apparmor_socket_sendmsg+0x29/0x30 [ 32.098624] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.104149] ? security_socket_sendmsg+0x94/0xc0 [ 32.108914] ? netlink_unicast+0x760/0x760 [ 32.113151] sock_sendmsg+0xd5/0x120 [ 32.116867] ___sys_sendmsg+0x7fd/0x930 [ 32.120836] ? copy_msghdr_from_user+0x580/0x580 [ 32.125591] ? graph_lock+0x170/0x170 [ 32.129394] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.134944] ? __fget_light+0x2f7/0x440 [ 32.138922] ? fget_raw+0x20/0x20 [ 32.142385] ? __do_page_fault+0x620/0xe50 [ 32.146612] ? lock_downgrade+0x8f0/0x8f0 [ 32.150764] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.156300] ? sockfd_lookup_light+0xc5/0x160 [ 32.160788] __sys_sendmsg+0x11d/0x290 [ 32.164672] ? __ia32_sys_shutdown+0x80/0x80 [ 32.169074] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.174603] ? __do_page_fault+0x449/0xe50 [ 32.178829] ? do_syscall_64+0x9a/0x820 [ 32.182827] ? do_syscall_64+0x9a/0x820 [ 32.186807] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 32.191923] __x64_sys_sendmsg+0x78/0xb0 [ 32.195980] do_syscall_64+0x1b9/0x820 [ 32.199859] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 32.205216] ? syscall_return_slowpath+0x5e0/0x5e0 [ 32.210136] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.214972] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 32.219976] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 32.224981] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.230508] ? prepare_exit_to_usermode+0x291/0x3b0 [ 32.235516] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.240354] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.245531] RIP: 0033:0x440f19 [ 32.248712] 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 [ 32.267600] RSP: 002b:00007ffe46052fd8 EFLAGS: 00000213 ORIG_RAX: 000000000000002e [ 32.275306] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440f19 [ 32.282565] RDX: 0000000000000000 RSI: 0000000020d65000 RDI: 0000000000000003 [ 32.289821] RBP: 0000000000000000 R08: 00000000004002c8 R09: 00000000004002c8 [ 32.297079] R10: 0000000001dff880 R11: 0000000000000213 R12: 0000000000401e60 [ 32.304335] R13: 0000000000401ef0 R14: 0000000000000000 R15: 0000000000000000 [ 32.312026] Dumping ftrace buffer: [ 32.315669] (ftrace buffer empty) [ 32.319372] Kernel Offset: disabled [ 32.322990] Rebooting in 86400 seconds..