[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 24.102665] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 25.216550] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.545166] random: sshd: uninitialized urandom read (32 bytes read) [ 26.141977] random: sshd: uninitialized urandom read (32 bytes read) [ 26.338354] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.3' (ECDSA) to the list of known hosts. [ 31.970061] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.076091] ------------[ cut here ]------------ [ 32.080954] AppArmor WARN apparmor_secid_to_secctx: ((!secdata)): [ 32.081105] WARNING: CPU: 0 PID: 4699 at security/apparmor/secid.c:82 apparmor_secid_to_secctx+0x2b5/0x2f0 [ 32.097197] Kernel panic - not syncing: panic_on_warn set ... [ 32.097197] [ 32.104550] CPU: 0 PID: 4699 Comm: syz-executor650 Not tainted 4.19.0-rc1-next-20180829+ #51 [ 32.113113] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.122450] Call Trace: [ 32.125031] dump_stack+0x1c9/0x2b4 [ 32.128667] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.133851] panic+0x238/0x4e7 [ 32.137039] ? add_taint.cold.5+0x16/0x16 [ 32.141177] ? __warn.cold.8+0x148/0x1ba [ 32.145224] ? __warn.cold.8+0x117/0x1ba [ 32.149278] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 32.154280] __warn.cold.8+0x163/0x1ba [ 32.158158] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 32.163161] report_bug+0x252/0x2d0 [ 32.166793] do_error_trap+0x1fc/0x4d0 [ 32.170682] ? math_error+0x3e0/0x3e0 [ 32.174472] ? vprintk_default+0x28/0x30 [ 32.178550] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.183391] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 32.188419] ? printk+0xa7/0xcf [ 32.191695] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.196554] do_invalid_op+0x1b/0x20 [ 32.200261] invalid_op+0x14/0x20 [ 32.203704] RIP: 0010:apparmor_secid_to_secctx+0x2b5/0x2f0 [ 32.209315] Code: c7 c7 a0 a2 58 87 e8 7a a0 0d fe 0f 0b e9 6c fe ff ff e8 9e e7 42 fe 48 c7 c6 e0 a3 58 87 48 c7 c7 00 a2 58 87 e8 5b a0 0d fe <0f> 0b e9 3f fe ff ff 48 89 df e8 1c f6 81 fe e9 ed fe ff ff bb f4 [ 32.228202] RSP: 0018:ffff8801c74b6d10 EFLAGS: 00010286 [ 32.233552] RAX: 0000000000000000 RBX: ffff8801c74b6ed0 RCX: 0000000000000000 [ 32.240807] RDX: 0000000000000000 RSI: ffffffff8163ac01 RDI: 0000000000000001 [ 32.248063] RBP: ffff8801c74b6d30 R08: ffff8801b8a30380 R09: ffffed003b603eca [ 32.255317] R10: ffffed003b603eca R11: ffff8801db01f657 R12: 0000000000000001 [ 32.262577] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801c74b6ed0 [ 32.269878] ? vprintk_func+0x81/0x117 [ 32.273790] security_secid_to_secctx+0x63/0xc0 [ 32.278450] ctnetlink_conntrack_event+0x303/0x1470 [ 32.283456] ? trace_hardirqs_on_caller+0xc0/0x2b0 [ 32.288406] ? ctnetlink_glue_build+0xc40/0xc40 [ 32.293064] ? lock_acquire+0x1e4/0x4f0 [ 32.297025] ? nf_conntrack_eventmask_report+0xaf/0x930 [ 32.302377] ? __lock_is_held+0xb5/0x140 [ 32.306433] nf_conntrack_eventmask_report+0x55f/0x930 [ 32.311700] ? nf_ct_expect_register_notifier+0x250/0x250 [ 32.317223] ? mark_held_locks+0xc9/0x160 [ 32.321364] ? __local_bh_enable_ip+0x161/0x230 [ 32.326021] ? lockdep_hardirqs_on+0x421/0x5c0 [ 32.330621] nf_ct_delete+0x33c/0x5d0 [ 32.334412] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 32.339516] ? nf_ct_delete_from_lists+0x6f0/0x6f0 [ 32.344458] ? nf_ct_iterate_cleanup+0x42e/0x5e0 [ 32.349214] nf_ct_iterate_cleanup+0x48c/0x5e0 [ 32.353784] ? nf_ct_alloc_hashtable+0x150/0x150 [ 32.358541] ? nf_ct_gc_expired+0x4a0/0x4a0 [ 32.362869] nf_ct_iterate_cleanup_net+0x23c/0x2d0 [ 32.367791] ? nf_ct_iterate_cleanup+0x5e0/0x5e0 [ 32.372545] ? ctnetlink_glue_seqadj+0x90/0x90 [ 32.377129] ctnetlink_del_conntrack+0x66c/0x850 [ 32.381873] ? lock_downgrade+0x840/0x8f0 [ 32.386017] ? ctnetlink_dump_table+0x1590/0x1590 [ 32.390871] ? __lock_is_held+0xb5/0x140 [ 32.394933] ? ctnetlink_dump_table+0x1590/0x1590 [ 32.399787] nfnetlink_rcv_msg+0xd88/0x1070 [ 32.404104] ? nfnetlink_bind+0x3b0/0x3b0 [ 32.408243] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.413769] ? refcount_sub_and_test_checked+0x21a/0x350 [ 32.419212] ? refcount_inc_not_zero_checked+0x2f0/0x2f0 [ 32.424665] ? apparmor_cred_prepare+0x590/0x590 [ 32.429411] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.434961] netlink_rcv_skb+0x172/0x440 [ 32.439017] ? nfnetlink_bind+0x3b0/0x3b0 [ 32.443155] ? netlink_ack+0xbe0/0xbe0 [ 32.447034] ? __netlink_ns_capable+0x100/0x130 [ 32.451691] nfnetlink_rcv+0x1c0/0x4d0 [ 32.455587] ? nfnetlink_rcv_batch+0x1900/0x1900 [ 32.460345] ? kasan_check_write+0x14/0x20 [ 32.464577] netlink_unicast+0x5a0/0x760 [ 32.468652] ? netlink_attachskb+0x9a0/0x9a0 [ 32.473048] ? netlink_sendmsg+0x74f/0xfc0 [ 32.477272] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 32.482279] netlink_sendmsg+0xa18/0xfc0 [ 32.486330] ? netlink_unicast+0x760/0x760 [ 32.490564] ? aa_sock_msg_perm.isra.13+0xba/0x160 [ 32.495525] ? apparmor_socket_sendmsg+0x29/0x30 [ 32.500280] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.505820] ? security_socket_sendmsg+0x94/0xc0 [ 32.510574] ? netlink_unicast+0x760/0x760 [ 32.514814] sock_sendmsg+0xd5/0x120 [ 32.518541] ___sys_sendmsg+0x7fd/0x930 [ 32.522527] ? copy_msghdr_from_user+0x580/0x580 [ 32.527285] ? graph_lock+0x170/0x170 [ 32.531080] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.536607] ? __fget_light+0x2f7/0x440 [ 32.540581] ? fget_raw+0x20/0x20 [ 32.544025] ? __do_page_fault+0x620/0xe50 [ 32.548247] ? lock_downgrade+0x8f0/0x8f0 [ 32.552388] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.557913] ? sockfd_lookup_light+0xc5/0x160 [ 32.562397] __sys_sendmsg+0x11d/0x290 [ 32.566272] ? __ia32_sys_shutdown+0x80/0x80 [ 32.570669] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.576213] ? __do_page_fault+0x449/0xe50 [ 32.580438] ? do_syscall_64+0x9a/0x820 [ 32.584400] ? do_syscall_64+0x9a/0x820 [ 32.588368] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 32.593465] __x64_sys_sendmsg+0x78/0xb0 [ 32.597533] do_syscall_64+0x1b9/0x820 [ 32.601605] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 32.606971] ? syscall_return_slowpath+0x5e0/0x5e0 [ 32.611894] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.616724] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 32.621727] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 32.626756] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.632281] ? prepare_exit_to_usermode+0x291/0x3b0 [ 32.637287] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.642122] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.647298] RIP: 0033:0x440f19 [ 32.650483] 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 [ 32.669385] RSP: 002b:00007ffed9fe6d68 EFLAGS: 00000213 ORIG_RAX: 000000000000002e [ 32.677081] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440f19 [ 32.684354] RDX: 0000000000000000 RSI: 0000000020d65000 RDI: 0000000000000003 [ 32.691620] RBP: 0000000000000000 R08: 00000000004002c8 R09: 00000000004002c8 [ 32.698873] R10: 0000000001a68880 R11: 0000000000000213 R12: 0000000000401e60 [ 32.706133] R13: 0000000000401ef0 R14: 0000000000000000 R15: 0000000000000000 [ 32.713946] Dumping ftrace buffer: [ 32.717552] (ftrace buffer empty) [ 32.721249] Kernel Offset: disabled [ 32.724861] Rebooting in 86400 seconds..