[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.439152] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.062045] random: sshd: uninitialized urandom read (32 bytes read) [ 26.348127] random: sshd: uninitialized urandom read (32 bytes read) [ 26.900520] random: sshd: uninitialized urandom read (32 bytes read) [ 27.078844] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.6' (ECDSA) to the list of known hosts. [ 32.709021] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.811274] ------------[ cut here ]------------ [ 32.816229] AppArmor WARN apparmor_secid_to_secctx: ((!secdata)): [ 32.816477] WARNING: CPU: 0 PID: 4656 at security/apparmor/secid.c:82 apparmor_secid_to_secctx+0x2b5/0x2f0 [ 32.832571] Kernel panic - not syncing: panic_on_warn set ... [ 32.832571] [ 32.839939] CPU: 0 PID: 4656 Comm: syz-executor542 Not tainted 4.19.0-rc1+ #214 [ 32.847366] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.856705] Call Trace: [ 32.859282] dump_stack+0x1c9/0x2b4 [ 32.862898] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.868085] panic+0x238/0x4e7 [ 32.871279] ? add_taint.cold.5+0x16/0x16 [ 32.875416] ? __warn.cold.8+0x148/0x1ba [ 32.879472] ? __warn.cold.8+0x117/0x1ba [ 32.883534] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 32.888534] __warn.cold.8+0x163/0x1ba [ 32.892410] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 32.897414] report_bug+0x252/0x2d0 [ 32.901028] do_error_trap+0x1fc/0x4d0 [ 32.904902] ? math_error+0x3e0/0x3e0 [ 32.908704] ? vprintk_default+0x28/0x30 [ 32.912752] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.917631] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 32.922636] ? printk+0xa7/0xcf [ 32.925905] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.930738] do_invalid_op+0x1b/0x20 [ 32.934461] invalid_op+0x14/0x20 [ 32.937918] RIP: 0010:apparmor_secid_to_secctx+0x2b5/0x2f0 [ 32.943531] 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 [ 32.962419] RSP: 0018:ffff8801c8d36d10 EFLAGS: 00010286 [ 32.967784] RAX: 0000000000000000 RBX: ffff8801c8d36ed0 RCX: 0000000000000000 [ 32.975038] RDX: 0000000000000000 RSI: ffffffff8163ac01 RDI: 0000000000000001 [ 32.982302] RBP: ffff8801c8d36d30 R08: ffff8801b7d00140 R09: ffffed003b603eca [ 32.989555] R10: ffffed003b603eca R11: ffff8801db01f657 R12: 0000000000000001 [ 32.996819] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801c8d36ed0 [ 33.004089] ? vprintk_func+0x81/0x117 [ 33.007988] security_secid_to_secctx+0x63/0xc0 [ 33.012654] ctnetlink_conntrack_event+0x303/0x1470 [ 33.017689] ? trace_hardirqs_on_caller+0xc0/0x2b0 [ 33.022636] ? ctnetlink_glue_build+0xc40/0xc40 [ 33.027303] ? lock_acquire+0x1e4/0x4f0 [ 33.031279] ? nf_conntrack_eventmask_report+0xaf/0x930 [ 33.036647] ? __lock_is_held+0xb5/0x140 [ 33.040697] nf_conntrack_eventmask_report+0x55f/0x930 [ 33.045972] ? nf_ct_expect_register_notifier+0x250/0x250 [ 33.051516] ? mark_held_locks+0xc9/0x160 [ 33.055689] ? __local_bh_enable_ip+0x161/0x230 [ 33.060343] ? lockdep_hardirqs_on+0x421/0x5c0 [ 33.064941] nf_ct_delete+0x33c/0x5d0 [ 33.068741] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 33.073833] ? nf_ct_delete_from_lists+0x6f0/0x6f0 [ 33.078777] ? nf_ct_iterate_cleanup+0x42e/0x5e0 [ 33.083548] nf_ct_iterate_cleanup+0x48c/0x5e0 [ 33.088124] ? nf_ct_alloc_hashtable+0x150/0x150 [ 33.092871] ? nf_ct_gc_expired+0x4a0/0x4a0 [ 33.097177] ? find_held_lock+0x36/0x1c0 [ 33.101227] nf_ct_iterate_cleanup_net+0x23c/0x2d0 [ 33.106153] ? nf_ct_iterate_cleanup+0x5e0/0x5e0 [ 33.110908] ? ctnetlink_glue_seqadj+0x90/0x90 [ 33.115492] ctnetlink_del_conntrack+0x66c/0x850 [ 33.120252] ? lock_downgrade+0x840/0x8f0 [ 33.124385] ? ctnetlink_dump_table+0x1590/0x1590 [ 33.129248] ? __lock_is_held+0xb5/0x140 [ 33.133297] ? ctnetlink_dump_table+0x1590/0x1590 [ 33.138142] nfnetlink_rcv_msg+0xd88/0x1070 [ 33.142460] ? nfnetlink_bind+0x3b0/0x3b0 [ 33.146608] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.152132] ? refcount_sub_and_test_checked+0x21a/0x350 [ 33.157603] ? refcount_inc_not_zero_checked+0x2f0/0x2f0 [ 33.163099] ? apparmor_cred_prepare+0x590/0x590 [ 33.167843] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.173369] netlink_rcv_skb+0x172/0x440 [ 33.177416] ? nfnetlink_bind+0x3b0/0x3b0 [ 33.181550] ? netlink_ack+0xbe0/0xbe0 [ 33.185432] ? __netlink_ns_capable+0x100/0x130 [ 33.190101] nfnetlink_rcv+0x1c0/0x4d0 [ 33.193992] ? nfnetlink_rcv_batch+0x1900/0x1900 [ 33.198737] ? kasan_check_write+0x14/0x20 [ 33.202971] netlink_unicast+0x5a0/0x760 [ 33.207032] ? netlink_attachskb+0x9a0/0x9a0 [ 33.211445] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.217028] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 33.222033] netlink_sendmsg+0xa18/0xfc0 [ 33.226109] ? netlink_unicast+0x760/0x760 [ 33.230333] ? aa_sock_msg_perm.isra.13+0xba/0x160 [ 33.235266] ? apparmor_socket_sendmsg+0x29/0x30 [ 33.240042] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.245571] ? security_socket_sendmsg+0x94/0xc0 [ 33.250330] ? netlink_unicast+0x760/0x760 [ 33.254559] sock_sendmsg+0xd5/0x120 [ 33.258260] ___sys_sendmsg+0x7fd/0x930 [ 33.262223] ? copy_msghdr_from_user+0x580/0x580 [ 33.266963] ? graph_lock+0x170/0x170 [ 33.270765] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.276294] ? __fget_light+0x2f7/0x440 [ 33.280255] ? fget_raw+0x20/0x20 [ 33.283700] ? __do_page_fault+0x620/0xe50 [ 33.287920] ? lock_downgrade+0x8f0/0x8f0 [ 33.292054] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.297584] ? sockfd_lookup_light+0xc5/0x160 [ 33.302077] __sys_sendmsg+0x11d/0x290 [ 33.305958] ? __ia32_sys_shutdown+0x80/0x80 [ 33.310351] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.315870] ? __do_page_fault+0x449/0xe50 [ 33.320137] ? do_syscall_64+0x9a/0x820 [ 33.324122] ? do_syscall_64+0x9a/0x820 [ 33.328092] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 33.333191] __x64_sys_sendmsg+0x78/0xb0 [ 33.337240] do_syscall_64+0x1b9/0x820 [ 33.341133] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 33.346523] ? syscall_return_slowpath+0x5e0/0x5e0 [ 33.351449] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.356288] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 33.361289] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 33.366293] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.371839] ? prepare_exit_to_usermode+0x291/0x3b0 [ 33.376843] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.381674] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.386854] RIP: 0033:0x441189 [ 33.390033] 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 [ 33.408916] RSP: 002b:00007fff6ac078e8 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 33.416610] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441189 [ 33.423863] RDX: 0000000000000000 RSI: 0000000020d65000 RDI: 0000000000000004 [ 33.431119] RBP: 0000000000000000 R08: 00000000004002c8 R09: 00000000004002c8 [ 33.438372] R10: 00000000004002c8 R11: 0000000000000217 R12: 00000000004020d0 [ 33.445624] R13: 0000000000402160 R14: 0000000000000000 R15: 0000000000000000 [ 33.453400] Dumping ftrace buffer: [ 33.457007] (ftrace buffer empty) [ 33.460701] Kernel Offset: disabled [ 33.464311] Rebooting in 86400 seconds..