[....] 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[   53.766595] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   55.740119] random: sshd: uninitialized urandom read (32 bytes read)
[   56.165784] random: sshd: uninitialized urandom read (32 bytes read)
[   57.961240] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.84' (ECDSA) to the list of known hosts.
[   63.939374] random: sshd: uninitialized urandom read (32 bytes read)
2018/09/21 06:32:48 fuzzer started
[   65.444533] random: cc1: uninitialized urandom read (8 bytes read)
2018/09/21 06:32:50 connecting to host at 10.128.0.26:32839
2018/09/21 06:32:50 checking revisions...
[   66.904045] ==================================================================
[   66.911494] BUG: KMSAN: uninit-value in kcov_open+0x4a/0xa0
[   66.917221] CPU: 0 PID: 4746 Comm: syz-fuzzer Not tainted 4.19.0-rc4+ #55
[   66.924134] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   66.933475] Call Trace:
[   66.936056]  dump_stack+0x2f6/0x430
[   66.939714]  kmsan_report+0x183/0x2b0
[   66.943526]  kmsan_internal_check_memory+0x17e/0x1f0
[   66.948656]  kmsan_check_memory+0xb/0x10
[   66.952740]  kcov_open+0x4a/0xa0
[   66.956116]  ? kcov_mmap+0x120/0x120
[   66.959825]  open_proxy_open+0x545/0x5d0
[   66.963892]  ? debugfs_file_put+0x100/0x100
[   66.968230]  do_dentry_open+0xfb0/0x18b0
[   66.972289]  ? kmsan_memcpy_origins+0x111/0x1b0
[   66.976972]  vfs_open+0xaf/0xe0
[   66.980251]  path_openat+0x1845/0x6e50
[   66.984155]  ? kmsan_set_origin_inline+0x6b/0x120
[   66.989027]  do_filp_open+0x259/0x610
[   66.992854]  do_sys_open+0x630/0x940
[   66.996582]  __se_sys_openat+0xcb/0xe0
[   67.000474]  __x64_sys_openat+0x56/0x70
[   67.004446]  do_syscall_64+0xb8/0x100
[   67.008246]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   67.013428] RIP: 0033:0x47fcba
[   67.016621] 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
[   67.035552] RSP: 002b:000000c420157650 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
[   67.043261] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcba
[   67.050523] RDX: 0000000000080000 RSI: 000000c420084380 RDI: ffffffffffffff9c
[   67.057819] RBP: 000000c4201576d0 R08: 0000000000000000 R09: 0000000000000000
[   67.065081] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
[   67.072360] R13: 00000000000000f4 R14: 0000000000000074 R15: 0000000000000108
[   67.079648] 
[   67.081283] Local variable description: ----c.i.i.i.i@generic_permission
[   67.088105] Variable was created at:
[   67.091815]  generic_permission+0x4f/0xa90
[   67.096043]  inode_permission+0x11b/0x940
[   67.100176] 
[   67.101791] Byte 7 of 8 is uninitialized
[   67.105841] Memory access starts at ffff8801adcbf810
[   67.110928] ==================================================================
[   67.118278] Disabling lock debugging due to kernel taint
[   67.123727] Kernel panic - not syncing: panic_on_warn set ...
[   67.123727] 
[   67.131116] CPU: 0 PID: 4746 Comm: syz-fuzzer Tainted: G    B             4.19.0-rc4+ #55
[   67.139420] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   67.148762] Call Trace:
[   67.151354]  dump_stack+0x2f6/0x430
[   67.154989]  panic+0x54c/0xaf7
[   67.158212]  ? __msan_metadata_ptr_for_store_1+0x13/0x20
[   67.163682]  kmsan_report+0x2a8/0x2b0
[   67.167503]  kmsan_internal_check_memory+0x17e/0x1f0
[   67.172615]  kmsan_check_memory+0xb/0x10
[   67.176706]  kcov_open+0x4a/0xa0
[   67.180092]  ? kcov_mmap+0x120/0x120
[   67.183803]  open_proxy_open+0x545/0x5d0
[   67.187872]  ? debugfs_file_put+0x100/0x100
[   67.192196]  do_dentry_open+0xfb0/0x18b0
[   67.196256]  ? kmsan_memcpy_origins+0x111/0x1b0
[   67.200942]  vfs_open+0xaf/0xe0
[   67.204233]  path_openat+0x1845/0x6e50
[   67.208140]  ? kmsan_set_origin_inline+0x6b/0x120
[   67.213031]  do_filp_open+0x259/0x610
[   67.216861]  do_sys_open+0x630/0x940
[   67.220587]  __se_sys_openat+0xcb/0xe0
[   67.224484]  __x64_sys_openat+0x56/0x70
[   67.228462]  do_syscall_64+0xb8/0x100
[   67.232260]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   67.237452] RIP: 0033:0x47fcba
[   67.240653] 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
[   67.259566] RSP: 002b:000000c420157650 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
[   67.267268] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcba
[   67.274529] RDX: 0000000000080000 RSI: 000000c420084380 RDI: ffffffffffffff9c
[   67.281791] RBP: 000000c4201576d0 R08: 0000000000000000 R09: 0000000000000000
[   67.289077] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
[   67.296351] R13: 00000000000000f4 R14: 0000000000000074 R15: 0000000000000108
[   67.303990] Kernel Offset: disabled
[   67.307625] Rebooting in 86400 seconds..