[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[   55.368656] random: sshd: uninitialized urandom read (32 bytes read)
[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   58.406126] random: sshd: uninitialized urandom read (32 bytes read)
[   58.886345] random: sshd: uninitialized urandom read (32 bytes read)
[   60.643305] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.19' (ECDSA) to the list of known hosts.
[   66.476397] random: sshd: uninitialized urandom read (32 bytes read)
2018/09/20 14:09:18 fuzzer started
[   68.343392] random: cc1: uninitialized urandom read (8 bytes read)
2018/09/20 14:09:21 connecting to host at 10.128.0.26:41605
2018/09/20 14:09:21 checking revisions...
[   69.990276] ==================================================================
[   69.997866] BUG: KMSAN: uninit-value in kcov_open+0x4a/0xa0
[   70.003587] CPU: 1 PID: 4796 Comm: syz-fuzzer Not tainted 4.19.0-rc4+ #52
[   70.010526] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   70.019884] Call Trace:
[   70.022488]  dump_stack+0x2f6/0x430
[   70.026137]  kmsan_report+0x183/0x2b0
[   70.029957]  kmsan_internal_check_memory+0x17e/0x1f0
[   70.035080]  kmsan_check_memory+0xb/0x10
[   70.039156]  kcov_open+0x4a/0xa0
[   70.042755]  ? kcov_mmap+0x120/0x120
[   70.046504]  open_proxy_open+0x545/0x5d0
[   70.050700]  ? debugfs_file_put+0x100/0x100
[   70.055145]  do_dentry_open+0xfb0/0x18b0
[   70.059225]  ? kmsan_memcpy_origins+0x111/0x1b0
[   70.063921]  vfs_open+0xaf/0xe0
[   70.067329]  path_openat+0x1845/0x6e50
[   70.071249]  ? kmsan_set_origin_inline+0x6b/0x120
[   70.076448]  do_filp_open+0x259/0x610
[   70.080296]  do_sys_open+0x630/0x940
[   70.084039]  __se_sys_openat+0xcb/0xe0
[   70.087948]  __x64_sys_openat+0x56/0x70
[   70.092017]  do_syscall_64+0xb8/0x100
[   70.095846]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   70.101046] RIP: 0033:0x47fcba
[   70.104249] Code: e8 2b 41 fb ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 4c 8b 54 24 28 4c 8b 44 24 30 4c 8b 4c 24 38 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 40 ff ff ff ff 48 c7 44 24 48
[   70.123465] RSP: 002b:000000c420061650 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
[   70.131350] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcba
[   70.138624] RDX: 0000000000080000 RSI: 000000c420094380 RDI: ffffffffffffff9c
[   70.145900] RBP: 000000c4200616d0 R08: 0000000000000000 R09: 0000000000000000
[   70.153175] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
[   70.160476] R13: 00000000000000f4 R14: 0000000000000074 R15: 0000000000000108
[   70.167786] 
[   70.169461] Local variable description: ----c.i.i.i.i@generic_permission
[   70.176299] Variable was created at:
[   70.180024]  generic_permission+0x4f/0xa90
[   70.184267]  inode_permission+0x11b/0x940
[   70.188414] 
[   70.190076] Byte 7 of 8 is uninitialized
[   70.194141] Memory access starts at ffff8801ae4bf810
[   70.199242] ==================================================================
[   70.206603] Disabling lock debugging due to kernel taint
[   70.212056] Kernel panic - not syncing: panic_on_warn set ...
[   70.212056] 
[   70.219572] CPU: 1 PID: 4796 Comm: syz-fuzzer Tainted: G    B             4.19.0-rc4+ #52
[   70.227888] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   70.237533] Call Trace:
[   70.240144]  dump_stack+0x2f6/0x430
[   70.243822]  panic+0x54c/0xaf7
[   70.247070]  ? __msan_metadata_ptr_for_store_1+0x13/0x20
[   70.252659]  kmsan_report+0x2a8/0x2b0
[   70.256503]  kmsan_internal_check_memory+0x17e/0x1f0
[   70.261632]  kmsan_check_memory+0xb/0x10
[   70.265804]  kcov_open+0x4a/0xa0
[   70.269362]  ? kcov_mmap+0x120/0x120
[   70.273462]  open_proxy_open+0x545/0x5d0
[   70.277556]  ? debugfs_file_put+0x100/0x100
[   70.281893]  do_dentry_open+0xfb0/0x18b0
[   70.285968]  ? kmsan_memcpy_origins+0x111/0x1b0
[   70.291095]  vfs_open+0xaf/0xe0
[   70.294482]  path_openat+0x1845/0x6e50
[   70.298898]  ? kmsan_set_origin_inline+0x6b/0x120
[   70.303832]  do_filp_open+0x259/0x610
[   70.307686]  do_sys_open+0x630/0x940
[   70.311552]  __se_sys_openat+0xcb/0xe0
[   70.315484]  __x64_sys_openat+0x56/0x70
[   70.319543]  do_syscall_64+0xb8/0x100
[   70.323450]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   70.328711] RIP: 0033:0x47fcba
[   70.331934] Code: e8 2b 41 fb ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 4c 8b 54 24 28 4c 8b 44 24 30 4c 8b 4c 24 38 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 40 ff ff ff ff 48 c7 44 24 48
[   70.351060] RSP: 002b:000000c420061650 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
[   70.358801] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcba
[   70.366093] RDX: 0000000000080000 RSI: 000000c420094380 RDI: ffffffffffffff9c
[   70.373371] RBP: 000000c4200616d0 R08: 0000000000000000 R09: 0000000000000000
[   70.380649] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
[   70.387925] R13: 00000000000000f4 R14: 0000000000000074 R15: 0000000000000108
[   70.395802] Kernel Offset: disabled
[   70.399484] Rebooting in 86400 seconds..