[....] 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[   52.618893] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   56.493267] random: sshd: uninitialized urandom read (32 bytes read)
[   56.973822] random: sshd: uninitialized urandom read (32 bytes read)
[   59.615376] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.83' (ECDSA) to the list of known hosts.
[   65.665245] random: sshd: uninitialized urandom read (32 bytes read)
2018/09/20 14:09:16 fuzzer started
[   67.050168] random: cc1: uninitialized urandom read (8 bytes read)
2018/09/20 14:09:19 connecting to host at 10.128.0.26:45207
2018/09/20 14:09:19 checking revisions...
[   68.604366] ==================================================================
[   68.611778] BUG: KMSAN: uninit-value in kcov_open+0x4a/0xa0
[   68.617489] CPU: 0 PID: 4675 Comm: syz-fuzzer Not tainted 4.19.0-rc4+ #52
[   68.624407] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   68.633755] Call Trace:
[   68.636345]  dump_stack+0x2f6/0x430
[   68.639986]  kmsan_report+0x183/0x2b0
[   68.643791]  kmsan_internal_check_memory+0x17e/0x1f0
[   68.648900]  kmsan_check_memory+0xb/0x10
[   68.652957]  kcov_open+0x4a/0xa0
[   68.656327]  ? kcov_mmap+0x120/0x120
[   68.660036]  open_proxy_open+0x545/0x5d0
[   68.664105]  ? debugfs_file_put+0x100/0x100
[   68.668427]  do_dentry_open+0xfb0/0x18b0
[   68.672487]  ? kmsan_memcpy_origins+0x111/0x1b0
[   68.677169]  vfs_open+0xaf/0xe0
[   68.680450]  path_openat+0x1845/0x6e50
[   68.684370]  ? kmsan_set_origin_inline+0x6b/0x120
[   68.689245]  do_filp_open+0x259/0x610
[   68.693071]  do_sys_open+0x630/0x940
[   68.696796]  __se_sys_openat+0xcb/0xe0
[   68.700696]  __x64_sys_openat+0x56/0x70
[   68.704720]  do_syscall_64+0xb8/0x100
[   68.708519]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   68.713707] RIP: 0033:0x47fcba
[   68.716930] 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
[   68.735874] RSP: 002b:000000c420031650 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
[   68.743606] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcba
[   68.750905] RDX: 0000000000080000 RSI: 000000c4200125c0 RDI: ffffffffffffff9c
[   68.758173] RBP: 000000c4200316d0 R08: 0000000000000000 R09: 0000000000000000
[   68.765440] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
[   68.772718] R13: 00000000000000f4 R14: 0000000000000074 R15: 0000000000000108
[   68.780021] 
[   68.781645] Local variable description: ----c.i.i.i.i@generic_permission
[   68.788494] Variable was created at:
[   68.792210]  generic_permission+0x4f/0xa90
[   68.796436]  inode_permission+0x11b/0x940
[   68.800578] 
[   68.802208] Byte 7 of 8 is uninitialized
[   68.806263] Memory access starts at ffff8801b063f810
[   68.811348] ==================================================================
[   68.818707] Disabling lock debugging due to kernel taint
[   68.824150] Kernel panic - not syncing: panic_on_warn set ...
[   68.824150] 
[   68.831900] CPU: 0 PID: 4675 Comm: syz-fuzzer Tainted: G    B             4.19.0-rc4+ #52
[   68.840207] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   68.849563] Call Trace:
[   68.852175]  dump_stack+0x2f6/0x430
[   68.855815]  panic+0x54c/0xaf7
[   68.859039]  ? __msan_metadata_ptr_for_store_1+0x13/0x20
[   68.864503]  kmsan_report+0x2a8/0x2b0
[   68.868317]  kmsan_internal_check_memory+0x17e/0x1f0
[   68.873436]  kmsan_check_memory+0xb/0x10
[   68.877496]  kcov_open+0x4a/0xa0
[   68.880862]  ? kcov_mmap+0x120/0x120
[   68.884588]  open_proxy_open+0x545/0x5d0
[   68.888671]  ? debugfs_file_put+0x100/0x100
[   68.893006]  do_dentry_open+0xfb0/0x18b0
[   68.897071]  ? kmsan_memcpy_origins+0x111/0x1b0
[   68.901750]  vfs_open+0xaf/0xe0
[   68.905047]  path_openat+0x1845/0x6e50
[   68.908949]  ? kmsan_set_origin_inline+0x6b/0x120
[   68.913835]  do_filp_open+0x259/0x610
[   68.917669]  do_sys_open+0x630/0x940
[   68.921402]  __se_sys_openat+0xcb/0xe0
[   68.925295]  __x64_sys_openat+0x56/0x70
[   68.929269]  do_syscall_64+0xb8/0x100
[   68.933076]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   68.938261] RIP: 0033:0x47fcba
[   68.941447] 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
[   68.960348] RSP: 002b:000000c420031650 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
[   68.968060] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcba
[   68.975327] RDX: 0000000000080000 RSI: 000000c4200125c0 RDI: ffffffffffffff9c
[   68.982607] RBP: 000000c4200316d0 R08: 0000000000000000 R09: 0000000000000000
[   68.989886] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
[   68.997158] R13: 00000000000000f4 R14: 0000000000000074 R15: 0000000000000108
[   69.004841] Kernel Offset: disabled
[   69.008480] Rebooting in 86400 seconds..