[....] 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[   52.670173] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   55.558485] random: sshd: uninitialized urandom read (32 bytes read)
[   56.027923] random: sshd: uninitialized urandom read (32 bytes read)
[   57.715940] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.64' (ECDSA) to the list of known hosts.
[   63.477763] random: sshd: uninitialized urandom read (32 bytes read)
2018/09/20 14:09:15 fuzzer started
[   65.352331] random: cc1: uninitialized urandom read (8 bytes read)
2018/09/20 14:09:19 connecting to host at 10.128.0.26:45823
2018/09/20 14:09:19 checking revisions...
[   67.738344] ==================================================================
[   67.746291] BUG: KMSAN: uninit-value in kcov_open+0x4a/0xa0
[   67.752010] CPU: 0 PID: 4653 Comm: syz-fuzzer Not tainted 4.19.0-rc4+ #52
[   67.759086] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   67.768635] Call Trace:
[   67.771252]  dump_stack+0x2f6/0x430
[   67.774905]  kmsan_report+0x183/0x2b0
[   67.778761]  kmsan_internal_check_memory+0x17e/0x1f0
[   67.784169]  kmsan_check_memory+0xb/0x10
[   67.788322]  kcov_open+0x4a/0xa0
[   67.791732]  ? kcov_mmap+0x120/0x120
[   67.795791]  open_proxy_open+0x545/0x5d0
[   67.800074]  ? debugfs_file_put+0x100/0x100
[   67.804413]  do_dentry_open+0xfb0/0x18b0
[   67.808585]  ? kmsan_memcpy_origins+0x111/0x1b0
[   67.813296]  vfs_open+0xaf/0xe0
[   67.816602]  path_openat+0x1845/0x6e50
[   67.820540]  ? kmsan_set_origin_inline+0x6b/0x120
[   67.825509]  do_filp_open+0x259/0x610
[   67.829359]  do_sys_open+0x630/0x940
[   67.833163]  __se_sys_openat+0xcb/0xe0
[   67.837075]  __x64_sys_openat+0x56/0x70
[   67.841063]  do_syscall_64+0xb8/0x100
[   67.844877]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   67.850072] RIP: 0033:0x47fcba
[   67.853273] 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
[   67.872182] RSP: 002b:000000c420151650 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
[   67.879967] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcba
[   67.887244] RDX: 0000000000080000 RSI: 000000c420012220 RDI: ffffffffffffff9c
[   67.894673] RBP: 000000c4201516d0 R08: 0000000000000000 R09: 0000000000000000
[   67.901984] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
[   67.909257] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
[   67.916669] 
[   67.918363] Local variable description: ----c.i.i.i.i@generic_permission
[   67.925205] Variable was created at:
[   67.929000]  generic_permission+0x4f/0xa90
[   67.933247]  inode_permission+0x11b/0x940
[   67.937395] 
[   67.939026] Byte 7 of 8 is uninitialized
[   67.943084] Memory access starts at ffff8801aebbf810
[   67.948187] ==================================================================
[   67.955552] Disabling lock debugging due to kernel taint
[   67.961017] Kernel panic - not syncing: panic_on_warn set ...
[   67.961017] 
[   67.968387] CPU: 0 PID: 4653 Comm: syz-fuzzer Tainted: G    B             4.19.0-rc4+ #52
[   67.976728] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   67.986100] Call Trace:
[   67.988734]  dump_stack+0x2f6/0x430
[   67.992390]  panic+0x54c/0xaf7
[   67.995642]  ? __msan_metadata_ptr_for_store_1+0x13/0x20
[   68.001099]  kmsan_report+0x2a8/0x2b0
[   68.004912]  kmsan_internal_check_memory+0x17e/0x1f0
[   68.010025]  kmsan_check_memory+0xb/0x10
[   68.014083]  kcov_open+0x4a/0xa0
[   68.017446]  ? kcov_mmap+0x120/0x120
[   68.021157]  open_proxy_open+0x545/0x5d0
[   68.025231]  ? debugfs_file_put+0x100/0x100
[   68.029564]  do_dentry_open+0xfb0/0x18b0
[   68.033653]  ? kmsan_memcpy_origins+0x111/0x1b0
[   68.038344]  vfs_open+0xaf/0xe0
[   68.041642]  path_openat+0x1845/0x6e50
[   68.045566]  ? kmsan_set_origin_inline+0x6b/0x120
[   68.050461]  do_filp_open+0x259/0x610
[   68.054317]  do_sys_open+0x630/0x940
[   68.058041]  __se_sys_openat+0xcb/0xe0
[   68.061933]  __x64_sys_openat+0x56/0x70
[   68.065903]  do_syscall_64+0xb8/0x100
[   68.069715]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   68.074902] RIP: 0033:0x47fcba
[   68.078087] 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
[   68.096979] RSP: 002b:000000c420151650 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
[   68.104700] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcba
[   68.111981] RDX: 0000000000080000 RSI: 000000c420012220 RDI: ffffffffffffff9c
[   68.119240] RBP: 000000c4201516d0 R08: 0000000000000000 R09: 0000000000000000
[   68.126503] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
[   68.133765] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
[   68.141393] Kernel Offset: disabled
[   68.145028] Rebooting in 86400 seconds..