[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 25.584788] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.359406] random: sshd: uninitialized urandom read (32 bytes read) [ 27.705873] random: sshd: uninitialized urandom read (32 bytes read) [ 28.297162] random: sshd: uninitialized urandom read (32 bytes read) [ 28.477760] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.30' (ECDSA) to the list of known hosts. [ 34.082316] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 34.186117] ------------[ cut here ]------------ [ 34.190996] AppArmor WARN apparmor_secid_to_secctx: ((!secdata)): [ 34.191145] WARNING: CPU: 1 PID: 4738 at security/apparmor/secid.c:82 apparmor_secid_to_secctx+0x2b5/0x2f0 [ 34.207247] Kernel panic - not syncing: panic_on_warn set ... [ 34.207247] [ 34.214619] CPU: 1 PID: 4738 Comm: syz-executor752 Not tainted 4.19.0-rc1+ #193 [ 34.222067] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.231408] Call Trace: [ 34.233992] dump_stack+0x1c9/0x2b4 [ 34.237613] ? dump_stack_print_info.cold.2+0x52/0x52 [ 34.242820] panic+0x238/0x4e7 [ 34.246008] ? add_taint.cold.5+0x16/0x16 [ 34.250145] ? __warn.cold.8+0x148/0x1ba [ 34.254197] ? __warn.cold.8+0x117/0x1ba [ 34.258252] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 34.263260] __warn.cold.8+0x163/0x1ba [ 34.267139] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 34.272148] report_bug+0x252/0x2d0 [ 34.275764] do_error_trap+0x1fc/0x4d0 [ 34.279641] ? math_error+0x3e0/0x3e0 [ 34.283428] ? vprintk_default+0x28/0x30 [ 34.287481] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.292331] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 34.297358] ? printk+0xa7/0xcf [ 34.300657] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.305506] do_invalid_op+0x1b/0x20 [ 34.309229] invalid_op+0x14/0x20 [ 34.312698] RIP: 0010:apparmor_secid_to_secctx+0x2b5/0x2f0 [ 34.318328] 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 [ 34.337233] RSP: 0018:ffff8801d90c6d10 EFLAGS: 00010286 [ 34.342585] RAX: 0000000000000000 RBX: ffff8801d90c6ed0 RCX: 0000000000000000 [ 34.349840] RDX: 0000000000000000 RSI: ffffffff8163ac01 RDI: 0000000000000001 [ 34.357091] RBP: ffff8801d90c6d30 R08: ffff8801d8af60c0 R09: ffffed003b623eca [ 34.364344] R10: ffffed003b623eca R11: ffff8801db11f657 R12: 0000000000000001 [ 34.371609] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801d90c6ed0 [ 34.378878] ? vprintk_func+0x81/0x117 [ 34.382759] security_secid_to_secctx+0x63/0xc0 [ 34.387426] ctnetlink_conntrack_event+0x303/0x1470 [ 34.392440] ? trace_hardirqs_on_caller+0xc0/0x2b0 [ 34.397381] ? ctnetlink_glue_build+0xc40/0xc40 [ 34.402049] ? lock_acquire+0x1e4/0x4f0 [ 34.406014] ? nf_conntrack_eventmask_report+0xaf/0x930 [ 34.411367] ? __lock_is_held+0xb5/0x140 [ 34.415422] nf_conntrack_eventmask_report+0x55f/0x930 [ 34.420709] ? nf_ct_expect_register_notifier+0x250/0x250 [ 34.426235] ? mark_held_locks+0xc9/0x160 [ 34.430375] ? __local_bh_enable_ip+0x161/0x230 [ 34.435037] ? lockdep_hardirqs_on+0x421/0x5c0 [ 34.439619] nf_ct_delete+0x33c/0x5d0 [ 34.443406] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 34.448501] ? nf_ct_delete_from_lists+0x6f0/0x6f0 [ 34.453439] ? nf_ct_iterate_cleanup+0x42e/0x5e0 [ 34.458191] nf_ct_iterate_cleanup+0x48c/0x5e0 [ 34.462763] ? nf_ct_alloc_hashtable+0x150/0x150 [ 34.467521] ? nf_ct_gc_expired+0x4a0/0x4a0 [ 34.471849] nf_ct_iterate_cleanup_net+0x23c/0x2d0 [ 34.476767] ? nf_ct_iterate_cleanup+0x5e0/0x5e0 [ 34.481514] ? ctnetlink_glue_seqadj+0x90/0x90 [ 34.486109] ctnetlink_del_conntrack+0x66c/0x850 [ 34.490852] ? lock_downgrade+0x840/0x8f0 [ 34.494987] ? ctnetlink_dump_table+0x1590/0x1590 [ 34.499818] ? __lock_is_held+0xb5/0x140 [ 34.503868] ? ctnetlink_dump_table+0x1590/0x1590 [ 34.508699] nfnetlink_rcv_msg+0xd88/0x1070 [ 34.513034] ? nfnetlink_bind+0x3b0/0x3b0 [ 34.517181] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.522703] ? refcount_sub_and_test_checked+0x21a/0x350 [ 34.528141] ? refcount_inc_not_zero_checked+0x2f0/0x2f0 [ 34.533597] ? apparmor_cred_prepare+0x590/0x590 [ 34.538342] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.543867] netlink_rcv_skb+0x172/0x440 [ 34.547927] ? nfnetlink_bind+0x3b0/0x3b0 [ 34.552090] ? netlink_ack+0xbe0/0xbe0 [ 34.555969] ? __netlink_ns_capable+0x100/0x130 [ 34.560626] nfnetlink_rcv+0x1c0/0x4d0 [ 34.564500] ? nfnetlink_rcv_batch+0x1900/0x1900 [ 34.569259] ? kasan_check_write+0x14/0x20 [ 34.573546] netlink_unicast+0x5a0/0x760 [ 34.577631] ? netlink_attachskb+0x9a0/0x9a0 [ 34.582032] ? netlink_sendmsg+0x74f/0xfc0 [ 34.586257] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 34.591291] netlink_sendmsg+0xa18/0xfc0 [ 34.595341] ? netlink_unicast+0x760/0x760 [ 34.599572] ? aa_sock_msg_perm.isra.13+0xba/0x160 [ 34.604513] ? apparmor_socket_sendmsg+0x29/0x30 [ 34.609272] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.615085] ? security_socket_sendmsg+0x94/0xc0 [ 34.619842] ? netlink_unicast+0x760/0x760 [ 34.624102] sock_sendmsg+0xd5/0x120 [ 34.627805] ___sys_sendmsg+0x7fd/0x930 [ 34.631797] ? copy_msghdr_from_user+0x580/0x580 [ 34.636551] ? graph_lock+0x170/0x170 [ 34.640363] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.645891] ? __fget_light+0x2f7/0x440 [ 34.649855] ? fget_raw+0x20/0x20 [ 34.653334] ? __do_page_fault+0x620/0xe50 [ 34.657560] ? lock_downgrade+0x8f0/0x8f0 [ 34.661705] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 34.667231] ? sockfd_lookup_light+0xc5/0x160 [ 34.671715] __sys_sendmsg+0x11d/0x290 [ 34.675604] ? __ia32_sys_shutdown+0x80/0x80 [ 34.680018] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.685551] ? __do_page_fault+0x449/0xe50 [ 34.689784] ? do_syscall_64+0x9a/0x820 [ 34.693741] ? do_syscall_64+0x9a/0x820 [ 34.697720] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 34.702841] __x64_sys_sendmsg+0x78/0xb0 [ 34.706891] do_syscall_64+0x1b9/0x820 [ 34.710764] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 34.716118] ? syscall_return_slowpath+0x5e0/0x5e0 [ 34.721035] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.725883] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 34.730896] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 34.735912] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.741502] ? prepare_exit_to_usermode+0x291/0x3b0 [ 34.746547] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.751391] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 34.756592] RIP: 0033:0x440f19 [ 34.759771] 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 [ 34.778684] RSP: 002b:00007ffe69860538 EFLAGS: 00000213 ORIG_RAX: 000000000000002e [ 34.786386] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440f19 [ 34.793643] RDX: 0000000000000000 RSI: 0000000020d65000 RDI: 0000000000000003 [ 34.800901] RBP: 0000000000000000 R08: 00000000004002c8 R09: 00000000004002c8 [ 34.808170] R10: 00000000008f3880 R11: 0000000000000213 R12: 0000000000401e60 [ 34.815430] R13: 0000000000401ef0 R14: 0000000000000000 R15: 0000000000000000 [ 34.823239] Dumping ftrace buffer: [ 34.826871] (ftrace buffer empty) [ 34.830569] Kernel Offset: disabled [ 34.834188] Rebooting in 86400 seconds..