[....] 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[ 15.440828] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.725335] random: sshd: uninitialized urandom read (32 bytes read) [ 29.240956] random: sshd: uninitialized urandom read (32 bytes read) [ 29.527541] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.44' (ECDSA) to the list of known hosts. [ 35.091481] urandom_read: 1 callbacks suppressed [ 35.091487] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 36.905648] ------------[ cut here ]------------ [ 36.910459] refcount_t: increment on 0; use-after-free. [ 36.915986] WARNING: CPU: 0 PID: 8763 at lib/refcount.c:153 refcount_inc+0x5d/0x70 [ 36.923687] Kernel panic - not syncing: panic_on_warn set ... [ 36.923687] [ 36.931035] CPU: 0 PID: 8763 Comm: syz-executor571 Not tainted 4.18.0-rc7+ #168 [ 36.938459] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.947792] Call Trace: [ 36.950374] dump_stack+0x1c9/0x2b4 [ 36.953990] ? dump_stack_print_info.cold.2+0x52/0x52 [ 36.959169] panic+0x238/0x4e7 [ 36.962342] ? add_taint.cold.5+0x16/0x16 [ 36.966470] ? __warn.cold.8+0x148/0x1ba [ 36.970517] ? __warn.cold.8+0x117/0x1ba [ 36.974591] ? refcount_inc+0x5d/0x70 [ 36.978369] __warn.cold.8+0x163/0x1ba [ 36.982238] ? refcount_inc+0x5d/0x70 [ 36.986017] report_bug+0x252/0x2d0 [ 36.989625] do_error_trap+0x1fc/0x4d0 [ 36.993488] ? math_error+0x3e0/0x3e0 [ 36.997268] ? vprintk_default+0x28/0x30 [ 37.001313] ? vprintk_func+0x81/0xe7 [ 37.005109] ? printk+0xa7/0xcf [ 37.008371] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.013192] do_invalid_op+0x1b/0x20 [ 37.016889] invalid_op+0x14/0x20 [ 37.020322] RIP: 0010:refcount_inc+0x5d/0x70 [ 37.024698] Code: 1d d3 c5 25 05 31 ff 89 de e8 bf 5b 1c fe 84 db 75 df e8 e6 5a 1c fe 48 c7 c7 e0 4e 3a 87 c6 05 b3 c5 25 05 01 e8 33 76 e7 fd <0f> 0b eb c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 [ 37.043810] RSP: 0018:ffff8801ae717af8 EFLAGS: 00010286 [ 37.049150] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 37.056397] RDX: 0000000000000000 RSI: ffffffff81632481 RDI: ffff8801ae7177d0 [ 37.063656] RBP: ffff8801ae717b00 R08: ffff8801aec1e000 R09: fffffbfff0ff1230 [ 37.070913] R10: fffffbfff0ff1230 R11: ffffffff87f89183 R12: 00000000000000ff [ 37.078160] R13: dffffc0000000000 R14: 00000000000000ff R15: ffff8801ae717d17 [ 37.085428] ? vprintk_func+0x81/0xe7 [ 37.089228] ? refcount_inc+0x5d/0x70 [ 37.093027] llc_sap_find+0x1ec/0x2a0 [ 37.096820] llc_ui_bind+0x6c7/0xf10 [ 37.100516] ? llc_ui_connect+0xe90/0xe90 [ 37.104648] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 37.110163] ? _copy_from_user+0xdf/0x150 [ 37.114289] __sys_bind+0x331/0x440 [ 37.117895] ? llc_ui_connect+0xe90/0xe90 [ 37.122023] ? __sys_bind+0x331/0x440 [ 37.125805] ? __ia32_sys_socketpair+0xf0/0xf0 [ 37.130364] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 37.135882] ? sockfd_lookup_light+0xc5/0x160 [ 37.140356] ? __x64_sys_futex+0x47f/0x6a0 [ 37.144570] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.150085] ? exit_to_usermode_loop+0x1f4/0x370 [ 37.154822] ? syscall_slow_exit_work+0x500/0x500 [ 37.159653] __x64_sys_bind+0x73/0xb0 [ 37.163432] do_syscall_64+0x1b9/0x820 [ 37.167309] ? finish_task_switch+0x1d3/0x870 [ 37.171785] ? syscall_return_slowpath+0x5e0/0x5e0 [ 37.176698] ? syscall_return_slowpath+0x31d/0x5e0 [ 37.181609] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 37.186607] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.191430] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.196595] RIP: 0033:0x445d59 [ 37.199759] Code: e8 ac e7 ff ff 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 fb 0d fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 37.218882] RSP: 002b:00007f011b7eedb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 [ 37.226567] RAX: ffffffffffffffda RBX: 00000000006dac38 RCX: 0000000000445d59 [ 37.233813] RDX: 0000000000000010 RSI: 00000000200000c0 RDI: 0000000000000004 [ 37.241060] RBP: 00000000006dac30 R08: 0000000000000000 R09: 0000000000000000 [ 37.248306] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac3c [ 37.255560] R13: 00007ffd1a26a9bf R14: 00007f011b7ef9c0 R15: 0000000000000001 [ 37.263208] Dumping ftrace buffer: [ 37.266727] (ftrace buffer empty) [ 37.270418] Kernel Offset: disabled [ 37.274020] Rebooting in 86400 seconds..