[....] 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[   52.692154] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   55.230420] random: sshd: uninitialized urandom read (32 bytes read)
[   55.610238] random: sshd: uninitialized urandom read (32 bytes read)
[   58.385301] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.74' (ECDSA) to the list of known hosts.
[   64.140487] random: sshd: uninitialized urandom read (32 bytes read)
2018/09/20 17:30:33 fuzzer started
[   65.543708] random: cc1: uninitialized urandom read (8 bytes read)
2018/09/20 17:30:35 connecting to host at 10.128.0.26:38643
2018/09/20 17:30:35 checking revisions...
[   66.951493] ==================================================================
[   66.958919] BUG: KMSAN: uninit-value in kcov_open+0x4a/0xa0
[   66.964632] CPU: 1 PID: 4652 Comm: syz-fuzzer Not tainted 4.19.0-rc4+ #53
[   66.971556] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   66.980908] Call Trace:
[   66.983497]  dump_stack+0x2f6/0x430
[   66.987134]  kmsan_report+0x183/0x2b0
[   66.990946]  kmsan_internal_check_memory+0x17e/0x1f0
[   66.996058]  kmsan_check_memory+0xb/0x10
[   67.000119]  kcov_open+0x4a/0xa0
[   67.003484]  ? kcov_mmap+0x120/0x120
[   67.007194]  open_proxy_open+0x545/0x5d0
[   67.011261]  ? debugfs_file_put+0x100/0x100
[   67.015585]  do_dentry_open+0xfb0/0x18b0
[   67.019683]  ? kmsan_memcpy_origins+0x111/0x1b0
[   67.024367]  vfs_open+0xaf/0xe0
[   67.027661]  path_openat+0x1845/0x6e50
[   67.031568]  ? kmsan_set_origin_inline+0x6b/0x120
[   67.036442]  do_filp_open+0x259/0x610
[   67.040265]  do_sys_open+0x630/0x940
[   67.043989]  __se_sys_openat+0xcb/0xe0
[   67.047885]  __x64_sys_openat+0x56/0x70
[   67.051879]  do_syscall_64+0xb8/0x100
[   67.055753]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   67.060953] RIP: 0033:0x47fcba
[   67.064139] 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
[   67.083032] RSP: 002b:000000c420031650 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
[   67.090754] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcba
[   67.098033] RDX: 0000000000080000 RSI: 000000c4200844a0 RDI: ffffffffffffff9c
[   67.105298] RBP: 000000c4200316d0 R08: 0000000000000000 R09: 0000000000000000
[   67.112575] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
[   67.119845] R13: 00000000000000f4 R14: 0000000000000074 R15: 0000000000000108
[   67.127121] 
[   67.128750] Local variable description: ----c.i.i.i.i@generic_permission
[   67.135592] Variable was created at:
[   67.139302]  generic_permission+0x4f/0xa90
[   67.143536]  inode_permission+0x11b/0x940
[   67.147676] 
[   67.149290] Byte 7 of 8 is uninitialized
[   67.153345] Memory access starts at ffff8801b0aff810
[   67.158434] ==================================================================
[   67.165784] Disabling lock debugging due to kernel taint
[   67.171259] Kernel panic - not syncing: panic_on_warn set ...
[   67.171259] 
[   67.180261] CPU: 1 PID: 4652 Comm: syz-fuzzer Tainted: G    B             4.19.0-rc4+ #53
[   67.188571] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   67.197914] Call Trace:
[   67.200498]  dump_stack+0x2f6/0x430
[   67.204135]  panic+0x54c/0xaf7
[   67.207362]  ? __msan_metadata_ptr_for_store_1+0x13/0x20
[   67.212832]  kmsan_report+0x2a8/0x2b0
[   67.216649]  kmsan_internal_check_memory+0x17e/0x1f0
[   67.221781]  kmsan_check_memory+0xb/0x10
[   67.225858]  kcov_open+0x4a/0xa0
[   67.229240]  ? kcov_mmap+0x120/0x120
[   67.232955]  open_proxy_open+0x545/0x5d0
[   67.237024]  ? debugfs_file_put+0x100/0x100
[   67.241345]  do_dentry_open+0xfb0/0x18b0
[   67.245404]  ? kmsan_memcpy_origins+0x111/0x1b0
[   67.250084]  vfs_open+0xaf/0xe0
[   67.253366]  path_openat+0x1845/0x6e50
[   67.257265]  ? kmsan_set_origin_inline+0x6b/0x120
[   67.262143]  do_filp_open+0x259/0x610
[   67.265970]  do_sys_open+0x630/0x940
[   67.269710]  __se_sys_openat+0xcb/0xe0
[   67.273629]  __x64_sys_openat+0x56/0x70
[   67.277601]  do_syscall_64+0xb8/0x100
[   67.281399]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   67.286603] RIP: 0033:0x47fcba
[   67.289813] 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
[   67.308714] RSP: 002b:000000c420031650 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
[   67.316440] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcba
[   67.323698] RDX: 0000000000080000 RSI: 000000c4200844a0 RDI: ffffffffffffff9c
[   67.330967] RBP: 000000c4200316d0 R08: 0000000000000000 R09: 0000000000000000
[   67.338229] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
[   67.345525] R13: 00000000000000f4 R14: 0000000000000074 R15: 0000000000000108
[   67.353130] Kernel Offset: disabled
[   67.356772] Rebooting in 86400 seconds..