[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.196423] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 21.896523] random: sshd: uninitialized urandom read (32 bytes read) [ 22.184633] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.708489] random: sshd: uninitialized urandom read (32 bytes read) [ 22.882854] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.47' (ECDSA) to the list of known hosts. [ 28.345675] 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 [ 28.878904] ------------[ cut here ]------------ [ 28.883804] refcount_t: increment on 0; use-after-free. [ 28.889420] WARNING: CPU: 1 PID: 4532 at lib/refcount.c:153 refcount_inc+0x5d/0x70 [ 28.897145] Kernel panic - not syncing: panic_on_warn set ... [ 28.897145] [ 28.904494] CPU: 1 PID: 4532 Comm: syz-executor544 Not tainted 4.18.0-rc7+ #40 [ 28.911850] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.921186] Call Trace: [ 28.923773] dump_stack+0x1c9/0x2b4 [ 28.927391] ? dump_stack_print_info.cold.2+0x52/0x52 [ 28.932575] panic+0x238/0x4e7 [ 28.935757] ? add_taint.cold.5+0x16/0x16 [ 28.939909] ? __warn.cold.8+0x148/0x1ba [ 28.943971] ? __warn.cold.8+0x117/0x1ba [ 28.948030] ? refcount_inc+0x5d/0x70 [ 28.951832] __warn.cold.8+0x163/0x1ba [ 28.955712] ? refcount_inc+0x5d/0x70 [ 28.959518] report_bug+0x252/0x2d0 [ 28.963148] do_error_trap+0x1fc/0x4d0 [ 28.967039] ? rcu_report_qs_rnp+0x7a0/0x7a0 [ 28.971442] ? math_error+0x3e0/0x3e0 [ 28.975229] ? vprintk_default+0x28/0x30 [ 28.979284] ? vprintk_func+0x81/0xe7 [ 28.983108] ? printk+0xa7/0xcf [ 28.986378] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.991219] do_invalid_op+0x1b/0x20 [ 28.994927] invalid_op+0x14/0x20 [ 28.998369] RIP: 0010:refcount_inc+0x5d/0x70 [ 29.002756] Code: 1d fc f0 25 05 31 ff 89 de e8 cf b1 1c fe 84 db 75 df e8 f6 b0 1c fe 48 c7 c7 40 4b 3a 87 c6 05 dc f0 25 05 01 e8 f3 c9 e7 fd <0f> 0b eb c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 [ 29.021936] RSP: 0018:ffff8801af7dfaf8 EFLAGS: 00010286 [ 29.027285] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 29.034544] RDX: 0000000000000000 RSI: ffffffff81632481 RDI: ffff8801af7df7d0 [ 29.041796] RBP: ffff8801af7dfb00 R08: ffff8801af7a06c0 R09: 0000000000000002 [ 29.049059] R10: ffff8801af7a06c0 R11: 0000000000000000 R12: 00000000000000ff [ 29.056346] R13: dffffc0000000000 R14: 00000000000000ff R15: ffff8801af7dfd17 [ 29.063618] ? vprintk_func+0x81/0xe7 [ 29.067439] ? refcount_inc+0x5d/0x70 [ 29.071245] llc_sap_find+0x1ec/0x2a0 [ 29.075054] llc_ui_bind+0x6c7/0xf10 [ 29.078772] ? llc_ui_connect+0xe90/0xe90 [ 29.082912] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 29.088448] ? _copy_from_user+0xdf/0x150 [ 29.092597] __sys_bind+0x331/0x440 [ 29.096223] ? llc_ui_connect+0xe90/0xe90 [ 29.100358] ? __sys_bind+0x331/0x440 [ 29.104149] ? __ia32_sys_socketpair+0xf0/0xf0 [ 29.108724] ? get_unused_fd_flags+0x122/0x1a0 [ 29.113301] ? fput+0x130/0x1a0 [ 29.116579] ? __x64_sys_futex+0x47f/0x6a0 [ 29.120798] ? fd_install+0x4d/0x60 [ 29.124425] ? do_futex+0x27d0/0x27d0 [ 29.128228] ? move_addr_to_kernel+0x70/0x70 [ 29.132636] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 29.137225] __x64_sys_bind+0x73/0xb0 [ 29.141053] do_syscall_64+0x1b9/0x820 [ 29.144953] ? finish_task_switch+0x1d3/0x870 [ 29.149453] ? syscall_return_slowpath+0x5e0/0x5e0 [ 29.154371] ? syscall_return_slowpath+0x31d/0x5e0 [ 29.159292] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 29.164645] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.169479] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.174653] RIP: 0033:0x445be9 [ 29.177825] Code: e8 8c b6 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 ab 0e fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 29.197068] RSP: 002b:00007f863586edb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 [ 29.204778] RAX: ffffffffffffffda RBX: 00000000006dac28 RCX: 0000000000445be9 [ 29.212038] RDX: 0000000000000010 RSI: 00000000200000c0 RDI: 0000000000000004 [ 29.219303] RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000 [ 29.226581] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac2c [ 29.233840] R13: 00007ffc2d1126af R14: 00007f863586f9c0 R15: 00000000006dad2c [ 29.241546] Dumping ftrace buffer: [ 29.245151] (ftrace buffer empty) [ 29.248857] Kernel Offset: disabled [ 29.252478] Rebooting in 86400 seconds..