[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.415365] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.574206] random: sshd: uninitialized urandom read (32 bytes read) [ 26.816479] random: sshd: uninitialized urandom read (32 bytes read) [ 27.364546] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.63' (ECDSA) to the list of known hosts. [ 33.235024] urandom_read: 1 callbacks suppressed [ 33.235029] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.338662] ------------[ cut here ]------------ [ 33.343513] AppArmor WARN apparmor_secid_to_secctx: ((!secdata)): [ 33.343710] WARNING: CPU: 0 PID: 4644 at security/apparmor/secid.c:82 apparmor_secid_to_secctx+0x2b5/0x2f0 [ 33.359778] Kernel panic - not syncing: panic_on_warn set ... [ 33.359778] [ 33.367124] CPU: 0 PID: 4644 Comm: syz-executor937 Not tainted 4.19.0-rc1+ #117 [ 33.374550] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.383886] Call Trace: [ 33.386475] dump_stack+0x1c9/0x2b4 [ 33.390089] ? dump_stack_print_info.cold.2+0x52/0x52 [ 33.395397] panic+0x238/0x4e7 [ 33.398663] ? add_taint.cold.5+0x16/0x16 [ 33.402799] ? __warn.cold.8+0x148/0x1ba [ 33.406846] ? __warn.cold.8+0x117/0x1ba [ 33.410897] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 33.415897] __warn.cold.8+0x163/0x1ba [ 33.419769] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 33.424772] report_bug+0x252/0x2d0 [ 33.428389] do_error_trap+0x1fc/0x4d0 [ 33.432288] ? math_error+0x3e0/0x3e0 [ 33.436088] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.440924] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 33.445927] ? vprintk_func+0x81/0x117 [ 33.449803] ? printk+0xa7/0xcf [ 33.453071] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.457924] do_invalid_op+0x1b/0x20 [ 33.461632] invalid_op+0x14/0x20 [ 33.465082] RIP: 0010:apparmor_secid_to_secctx+0x2b5/0x2f0 [ 33.470691] 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 [ 33.489576] RSP: 0018:ffff8801b56d6ee8 EFLAGS: 00010282 [ 33.494965] RAX: 0000000000000000 RBX: ffff8801b56d70a8 RCX: 0000000000000000 [ 33.502233] RDX: 0000000000000000 RSI: ffffffff8163ac01 RDI: 0000000000000001 [ 33.509517] RBP: ffff8801b56d6f08 R08: ffff8801b97de080 R09: ffffed003b603eca [ 33.516772] R10: ffffed003b603eca R11: ffff8801db01f657 R12: 0000000000000001 [ 33.524022] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801b56d70a8 [ 33.531299] ? vprintk_func+0x81/0x117 [ 33.535174] ? apparmor_secid_to_secctx+0x2b5/0x2f0 [ 33.540181] security_secid_to_secctx+0x63/0xc0 [ 33.544838] ctnetlink_conntrack_event+0x303/0x1470 [ 33.549840] ? __local_bh_enable_ip+0x161/0x230 [ 33.554497] ? __nf_conntrack_confirm+0x1293/0x34f0 [ 33.559500] ? ctnetlink_glue_build+0xc40/0xc40 [ 33.564164] ? lock_acquire+0x1e4/0x4f0 [ 33.568133] ? nf_ct_deliver_cached_events+0xa3/0x7e0 [ 33.573308] ? nf_conntrack_tuple_taken+0x1140/0x1140 [ 33.578486] ? __lock_is_held+0xb5/0x140 [ 33.582537] nf_ct_deliver_cached_events+0x4eb/0x7e0 [ 33.587641] ? nf_ct_expect_unregister_notifier+0x210/0x210 [ 33.593348] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 33.598090] ? retint_kernel+0x10/0x10 [ 33.601968] ipv4_confirm+0x2d5/0x500 [ 33.605755] ? nf_ct_l4proto_register_one+0x680/0x680 [ 33.610933] ? __sanitizer_cov_trace_cmp2+0x18/0x20 [ 33.615937] ? nf_nat_ipv4_out+0x35f/0x3d0 [ 33.620159] ? nf_ct_l4proto_register_one+0x680/0x680 [ 33.625332] nf_hook_slow+0xc2/0x1c0 [ 33.629032] ip_output+0x562/0x880 [ 33.632556] ? __ip_local_out+0x5e3/0xb50 [ 33.636688] ? ip_mc_output+0x15d0/0x15d0 [ 33.640821] ? ip_fragment.constprop.49+0x240/0x240 [ 33.645821] ? __ip_make_skb+0x10ff/0x1b40 [ 33.650043] ? dst_release+0x5d/0xb0 [ 33.653742] ip_local_out+0xc5/0x1b0 [ 33.657455] ip_send_skb+0x40/0xe0 [ 33.660988] udp_send_skb.isra.41+0x6b7/0x11d0 [ 33.665557] udp_push_pending_frames+0x5c/0xf0 [ 33.670125] udp_sendpage+0x3b2/0x590 [ 33.673909] ? udp_sendmsg+0x38e0/0x38e0 [ 33.677967] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 33.682968] ? ktime_get_coarse_real_ts64+0x243/0x3a0 [ 33.688144] ? udp_sendmsg+0x38e0/0x38e0 [ 33.692199] inet_sendpage+0x1de/0x750 [ 33.696107] ? inet_sendmsg+0x690/0x690 [ 33.700068] ? current_time+0x131/0x1b0 [ 33.704033] kernel_sendpage+0x93/0xf0 [ 33.707906] ? inet_sendmsg+0x690/0x690 [ 33.711866] sock_sendpage+0x8c/0xc0 [ 33.715566] ? kernel_sendpage+0xf0/0xf0 [ 33.719623] pipe_to_sendpage+0x2d0/0x400 [ 33.723766] ? generic_pipe_buf_nosteal+0x10/0x10 [ 33.728601] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.734138] ? splice_from_pipe_next.part.9+0x296/0x340 [ 33.739488] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 33.745025] ? touch_atime+0x103/0x320 [ 33.748899] __splice_from_pipe+0x38e/0x7c0 [ 33.753205] ? generic_pipe_buf_nosteal+0x10/0x10 [ 33.758050] splice_from_pipe+0x1ea/0x340 [ 33.762184] ? add_to_pipe+0x360/0x360 [ 33.766055] ? generic_pipe_buf_nosteal+0x10/0x10 [ 33.770880] ? splice_shrink_spd+0xd0/0xd0 [ 33.775123] generic_splice_sendpage+0x3c/0x50 [ 33.779688] ? splice_from_pipe+0x340/0x340 [ 33.783995] direct_splice_actor+0x128/0x190 [ 33.788664] splice_direct_to_actor+0x318/0x8f0 [ 33.793321] ? pipe_to_sendpage+0x400/0x400 [ 33.797638] ? do_splice_to+0x190/0x190 [ 33.801612] ? security_file_permission+0x1c2/0x230 [ 33.806634] ? rw_verify_area+0x118/0x360 [ 33.810772] do_splice_direct+0x2d4/0x420 [ 33.814907] ? splice_direct_to_actor+0x8f0/0x8f0 [ 33.819745] ? apparmor_file_permission+0x24/0x30 [ 33.824595] ? rw_verify_area+0x118/0x360 [ 33.828746] do_sendfile+0x62a/0xe20 [ 33.832463] ? do_compat_pwritev64+0x1c0/0x1c0 [ 33.837042] __ia32_compat_sys_sendfile+0x190/0x2a0 [ 33.842041] ? __ia32_sys_sendfile64+0x250/0x250 [ 33.846790] do_fast_syscall_32+0x34d/0xfb2 [ 33.851097] ? do_int80_syscall_32+0x890/0x890 [ 33.855667] ? entry_SYSENTER_compat+0x68/0x7f [ 33.860235] ? trace_hardirqs_off_caller+0xbb/0x2b0 [ 33.865239] ? syscall_return_slowpath+0x5e0/0x5e0 [ 33.870151] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.874992] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.879819] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 33.884820] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 33.889823] ? prepare_exit_to_usermode+0x291/0x3b0 [ 33.894831] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.899666] entry_SYSENTER_compat+0x70/0x7f [ 33.904059] RIP: 0023:0xf7f65ca9 [ 33.907409] Code: 55 08 8b 88 64 cd ff ff 8b 98 68 cd ff ff 89 c8 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 1c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 33.926308] RSP: 002b:00000000ffddb7fc EFLAGS: 00000217 ORIG_RAX: 00000000000000bb [ 33.934001] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000004 [ 33.941251] RDX: 0000000020000080 RSI: 000000000000ffe4 RDI: 0000000000000005 [ 33.948508] RBP: 0000000020000080 R08: 0000000000000000 R09: 0000000000000000 [ 33.955781] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 33.963035] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 33.970840] Dumping ftrace buffer: [ 33.974475] (ftrace buffer empty) [ 33.978170] Kernel Offset: disabled [ 33.981779] Rebooting in 86400 seconds..