[....] 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[   52.285955] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   54.317953] random: sshd: uninitialized urandom read (32 bytes read)
[   54.659375] random: sshd: uninitialized urandom read (32 bytes read)
[   56.468230] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.73' (ECDSA) to the list of known hosts.
[   62.208804] random: sshd: uninitialized urandom read (32 bytes read)
2018/09/20 17:30:31 fuzzer started
[   63.433347] random: cc1: uninitialized urandom read (8 bytes read)
2018/09/20 17:30:33 connecting to host at 10.128.0.26:36479
2018/09/20 17:30:33 checking revisions...
[   64.943246] ==================================================================
[   64.950645] BUG: KMSAN: uninit-value in kcov_open+0x4a/0xa0
[   64.956350] CPU: 0 PID: 4681 Comm: syz-fuzzer Not tainted 4.19.0-rc4+ #53
[   64.963262] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   64.972611] Call Trace:
[   64.975196]  dump_stack+0x2f6/0x430
[   64.978828]  kmsan_report+0x183/0x2b0
[   64.982634]  kmsan_internal_check_memory+0x17e/0x1f0
[   64.987742]  kmsan_check_memory+0xb/0x10
[   64.991796]  kcov_open+0x4a/0xa0
[   64.995155]  ? kcov_mmap+0x120/0x120
[   64.998868]  open_proxy_open+0x545/0x5d0
[   65.002939]  ? debugfs_file_put+0x100/0x100
[   65.007266]  do_dentry_open+0xfb0/0x18b0
[   65.011319]  ? kmsan_memcpy_origins+0x111/0x1b0
[   65.015994]  vfs_open+0xaf/0xe0
[   65.019271]  path_openat+0x1845/0x6e50
[   65.023184]  ? kmsan_set_origin_inline+0x6b/0x120
[   65.028074]  do_filp_open+0x259/0x610
[   65.031901]  do_sys_open+0x630/0x940
[   65.035632]  __se_sys_openat+0xcb/0xe0
[   65.039537]  __x64_sys_openat+0x56/0x70
[   65.043527]  do_syscall_64+0xb8/0x100
[   65.047335]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   65.052539] RIP: 0033:0x47fcba
[   65.055741] 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
[   65.074653] RSP: 002b:000000c42013d650 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
[   65.082361] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcba
[   65.089622] RDX: 0000000000080000 RSI: 000000c420084320 RDI: ffffffffffffff9c
[   65.096884] RBP: 000000c42013d6d0 R08: 0000000000000000 R09: 0000000000000000
[   65.104144] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
[   65.111406] R13: 00000000000000f4 R14: 0000000000000074 R15: 0000000000000001
[   65.118679] 
[   65.120295] Local variable description: ----c.i.i.i.i@generic_permission
[   65.127118] Variable was created at:
[   65.130841]  generic_permission+0x4f/0xa90
[   65.135069]  inode_permission+0x11b/0x940
[   65.139213] 
[   65.140829] Byte 7 of 8 is uninitialized
[   65.144875] Memory access starts at ffff8801aed9f810
[   65.149961] ==================================================================
[   65.157304] Disabling lock debugging due to kernel taint
[   65.162739] Kernel panic - not syncing: panic_on_warn set ...
[   65.162739] 
[   65.170111] CPU: 0 PID: 4681 Comm: syz-fuzzer Tainted: G    B             4.19.0-rc4+ #53
[   65.178411] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   65.187752] Call Trace:
[   65.190339]  dump_stack+0x2f6/0x430
[   65.193969]  panic+0x54c/0xaf7
[   65.197186]  ? __msan_metadata_ptr_for_store_1+0x13/0x20
[   65.202639]  kmsan_report+0x2a8/0x2b0
[   65.206443]  kmsan_internal_check_memory+0x17e/0x1f0
[   65.211573]  kmsan_check_memory+0xb/0x10
[   65.215650]  kcov_open+0x4a/0xa0
[   65.219011]  ? kcov_mmap+0x120/0x120
[   65.222734]  open_proxy_open+0x545/0x5d0
[   65.226809]  ? debugfs_file_put+0x100/0x100
[   65.231137]  do_dentry_open+0xfb0/0x18b0
[   65.235198]  ? kmsan_memcpy_origins+0x111/0x1b0
[   65.239881]  vfs_open+0xaf/0xe0
[   65.243160]  path_openat+0x1845/0x6e50
[   65.247070]  ? kmsan_set_origin_inline+0x6b/0x120
[   65.251950]  do_filp_open+0x259/0x610
[   65.255791]  do_sys_open+0x630/0x940
[   65.259527]  __se_sys_openat+0xcb/0xe0
[   65.263427]  __x64_sys_openat+0x56/0x70
[   65.267396]  do_syscall_64+0xb8/0x100
[   65.271191]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   65.276370] RIP: 0033:0x47fcba
[   65.279567] 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
[   65.298483] RSP: 002b:000000c42013d650 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
[   65.306197] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcba
[   65.313468] RDX: 0000000000080000 RSI: 000000c420084320 RDI: ffffffffffffff9c
[   65.320732] RBP: 000000c42013d6d0 R08: 0000000000000000 R09: 0000000000000000
[   65.327988] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
[   65.335246] R13: 00000000000000f4 R14: 0000000000000074 R15: 0000000000000001
[   65.342972] Kernel Offset: disabled
[   65.346603] Rebooting in 86400 seconds..