[....] 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[   54.011010] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   55.961581] random: sshd: uninitialized urandom read (32 bytes read)
[   56.508933] random: sshd: uninitialized urandom read (32 bytes read)
[   58.169686] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.92' (ECDSA) to the list of known hosts.
[   63.923369] random: sshd: uninitialized urandom read (32 bytes read)
2018/09/20 18:20:46 fuzzer started
[   65.272876] random: cc1: uninitialized urandom read (8 bytes read)
2018/09/20 18:20:48 connecting to host at 10.128.0.26:38433
2018/09/20 18:20:48 checking revisions...
[   66.831451] ==================================================================
[   66.838883] BUG: KMSAN: uninit-value in kcov_open+0x4a/0xa0
[   66.844633] CPU: 1 PID: 4743 Comm: syz-fuzzer Not tainted 4.19.0-rc4+ #54
[   66.851556] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   66.861018] Call Trace:
[   66.863618]  dump_stack+0x2f6/0x430
[   66.867626]  kmsan_report+0x183/0x2b0
[   66.871475]  kmsan_internal_check_memory+0x17e/0x1f0
[   66.876618]  kmsan_check_memory+0xb/0x10
[   66.880687]  kcov_open+0x4a/0xa0
[   66.884157]  ? kcov_mmap+0x120/0x120
[   66.887884]  open_proxy_open+0x545/0x5d0
[   66.891954]  ? debugfs_file_put+0x100/0x100
[   66.896294]  do_dentry_open+0xfb0/0x18b0
[   66.900389]  ? kmsan_memcpy_origins+0x111/0x1b0
[   66.905104]  vfs_open+0xaf/0xe0
[   66.908401]  path_openat+0x1845/0x6e50
[   66.912336]  ? kmsan_set_origin_inline+0x6b/0x120
[   66.917263]  do_filp_open+0x259/0x610
[   66.921107]  do_sys_open+0x630/0x940
[   66.924857]  __se_sys_openat+0xcb/0xe0
[   66.928754]  __x64_sys_openat+0x56/0x70
[   66.932731]  do_syscall_64+0xb8/0x100
[   66.936542]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   66.941727] RIP: 0033:0x47fcba
[   66.944949] 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
[   66.963860] RSP: 002b:000000c420125650 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
[   66.971578] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcba
[   66.978854] RDX: 0000000000080000 RSI: 000000c4200843e0 RDI: ffffffffffffff9c
[   66.986127] RBP: 000000c4201256d0 R08: 0000000000000000 R09: 0000000000000000
[   66.993402] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
[   67.000680] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
[   67.007962] 
[   67.009586] Local variable description: ----c.i.i.i.i@generic_permission
[   67.016412] Variable was created at:
[   67.020152]  generic_permission+0x4f/0xa90
[   67.024403]  inode_permission+0x11b/0x940
[   67.028540] 
[   67.030162] Byte 7 of 8 is uninitialized
[   67.034231] Memory access starts at ffff8801aeaaf810
[   67.039341] ==================================================================
[   67.046719] Disabling lock debugging due to kernel taint
[   67.052186] Kernel panic - not syncing: panic_on_warn set ...
[   67.052186] 
[   67.059578] CPU: 1 PID: 4743 Comm: syz-fuzzer Tainted: G    B             4.19.0-rc4+ #54
[   67.067886] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   67.077247] Call Trace:
[   67.079856]  dump_stack+0x2f6/0x430
[   67.083495]  panic+0x54c/0xaf7
[   67.086733]  ? __msan_metadata_ptr_for_store_1+0x13/0x20
[   67.092201]  kmsan_report+0x2a8/0x2b0
[   67.096052]  kmsan_internal_check_memory+0x17e/0x1f0
[   67.101202]  kmsan_check_memory+0xb/0x10
[   67.105298]  kcov_open+0x4a/0xa0
[   67.108674]  ? kcov_mmap+0x120/0x120
[   67.112398]  open_proxy_open+0x545/0x5d0
[   67.116471]  ? debugfs_file_put+0x100/0x100
[   67.120799]  do_dentry_open+0xfb0/0x18b0
[   67.124862]  ? kmsan_memcpy_origins+0x111/0x1b0
[   67.129632]  vfs_open+0xaf/0xe0
[   67.132917]  path_openat+0x1845/0x6e50
[   67.136823]  ? kmsan_set_origin_inline+0x6b/0x120
[   67.141710]  do_filp_open+0x259/0x610
[   67.145543]  do_sys_open+0x630/0x940
[   67.149291]  __se_sys_openat+0xcb/0xe0
[   67.153202]  __x64_sys_openat+0x56/0x70
[   67.157266]  do_syscall_64+0xb8/0x100
[   67.161110]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   67.166308] RIP: 0033:0x47fcba
[   67.169502] 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
[   67.188499] RSP: 002b:000000c420125650 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
[   67.196257] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcba
[   67.203550] RDX: 0000000000080000 RSI: 000000c4200843e0 RDI: ffffffffffffff9c
[   67.210824] RBP: 000000c4201256d0 R08: 0000000000000000 R09: 0000000000000000
[   67.218202] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
[   67.225497] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
[   67.233461] Kernel Offset: disabled
[   67.237105] Rebooting in 86400 seconds..