[....] 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[   52.228357] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   54.258349] random: sshd: uninitialized urandom read (32 bytes read)
[   54.651829] random: sshd: uninitialized urandom read (32 bytes read)
[   56.356885] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.83' (ECDSA) to the list of known hosts.
[   62.112129] random: sshd: uninitialized urandom read (32 bytes read)
2018/09/21 06:32:48 fuzzer started
[   63.577153] random: cc1: uninitialized urandom read (8 bytes read)
2018/09/21 06:32:51 connecting to host at 10.128.0.26:46595
2018/09/21 06:32:51 checking revisions...
[   65.066969] ==================================================================
[   65.074688] BUG: KMSAN: uninit-value in kcov_open+0x4a/0xa0
[   65.080437] CPU: 0 PID: 4663 Comm: syz-fuzzer Not tainted 4.19.0-rc4+ #55
[   65.087352] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   65.096695] Call Trace:
[   65.099283]  dump_stack+0x2f6/0x430
[   65.102916]  kmsan_report+0x183/0x2b0
[   65.106721]  kmsan_internal_check_memory+0x17e/0x1f0
[   65.111830]  kmsan_check_memory+0xb/0x10
[   65.115897]  kcov_open+0x4a/0xa0
[   65.119260]  ? kcov_mmap+0x120/0x120
[   65.122966]  open_proxy_open+0x545/0x5d0
[   65.127039]  ? debugfs_file_put+0x100/0x100
[   65.131359]  do_dentry_open+0xfb0/0x18b0
[   65.135415]  ? kmsan_memcpy_origins+0x111/0x1b0
[   65.140095]  vfs_open+0xaf/0xe0
[   65.143397]  path_openat+0x1845/0x6e50
[   65.147294]  ? kmsan_set_origin_inline+0x6b/0x120
[   65.152167]  do_filp_open+0x259/0x610
[   65.155993]  do_sys_open+0x630/0x940
[   65.159741]  __se_sys_openat+0xcb/0xe0
[   65.163656]  __x64_sys_openat+0x56/0x70
[   65.167667]  do_syscall_64+0xb8/0x100
[   65.171483]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   65.176667] RIP: 0033:0x47fcba
[   65.179852] 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
[   65.198744] RSP: 002b:000000c420031650 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
[   65.206474] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcba
[   65.213730] RDX: 0000000000080000 RSI: 000000c420084460 RDI: ffffffffffffff9c
[   65.220986] RBP: 000000c4200316d0 R08: 0000000000000000 R09: 0000000000000000
[   65.228245] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
[   65.235504] R13: 00000000000000f4 R14: 0000000000000074 R15: 0000000000000108
[   65.242779] 
[   65.244398] Local variable description: ----c.i.i.i.i@generic_permission
[   65.251218] Variable was created at:
[   65.254925]  generic_permission+0x4f/0xa90
[   65.259152]  inode_permission+0x11b/0x940
[   65.263280] 
[   65.264894] Byte 7 of 8 is uninitialized
[   65.268938] Memory access starts at ffff8801b40df810
[   65.274032] ==================================================================
[   65.281378] Disabling lock debugging due to kernel taint
[   65.286818] Kernel panic - not syncing: panic_on_warn set ...
[   65.286818] 
[   65.294191] CPU: 0 PID: 4663 Comm: syz-fuzzer Tainted: G    B             4.19.0-rc4+ #55
[   65.302490] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   65.311831] Call Trace:
[   65.314409]  dump_stack+0x2f6/0x430
[   65.318076]  panic+0x54c/0xaf7
[   65.321301]  ? __msan_metadata_ptr_for_store_1+0x13/0x20
[   65.326753]  kmsan_report+0x2a8/0x2b0
[   65.330565]  kmsan_internal_check_memory+0x17e/0x1f0
[   65.335719]  kmsan_check_memory+0xb/0x10
[   65.339804]  kcov_open+0x4a/0xa0
[   65.343168]  ? kcov_mmap+0x120/0x120
[   65.346878]  open_proxy_open+0x545/0x5d0
[   65.350945]  ? debugfs_file_put+0x100/0x100
[   65.355263]  do_dentry_open+0xfb0/0x18b0
[   65.359319]  ? kmsan_memcpy_origins+0x111/0x1b0
[   65.364056]  vfs_open+0xaf/0xe0
[   65.367356]  path_openat+0x1845/0x6e50
[   65.371281]  ? kmsan_set_origin_inline+0x6b/0x120
[   65.376153]  do_filp_open+0x259/0x610
[   65.379978]  do_sys_open+0x630/0x940
[   65.383725]  __se_sys_openat+0xcb/0xe0
[   65.387639]  __x64_sys_openat+0x56/0x70
[   65.391652]  do_syscall_64+0xb8/0x100
[   65.395464]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   65.400654] RIP: 0033:0x47fcba
[   65.403857] 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
[   65.422747] RSP: 002b:000000c420031650 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
[   65.430445] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcba
[   65.437717] RDX: 0000000000080000 RSI: 000000c420084460 RDI: ffffffffffffff9c
[   65.444980] RBP: 000000c4200316d0 R08: 0000000000000000 R09: 0000000000000000
[   65.452268] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
[   65.459543] R13: 00000000000000f4 R14: 0000000000000074 R15: 0000000000000108
[   65.467152] Kernel Offset: disabled
[   65.470787] Rebooting in 86400 seconds..