[....] 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[   56.115355] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.
[   57.405806] random: sshd: uninitialized urandom read (32 bytes read)

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   58.144391] random: sshd: uninitialized urandom read (32 bytes read)
[   59.876032] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.95' (ECDSA) to the list of known hosts.
[   65.667384] random: sshd: uninitialized urandom read (32 bytes read)
2018/09/20 18:21:36 fuzzer started
[   67.537062] random: cc1: uninitialized urandom read (8 bytes read)
2018/09/20 18:21:40 connecting to host at 10.128.0.26:40963
2018/09/20 18:21:40 checking revisions...
[   69.681316] ==================================================================
[   69.688765] BUG: KMSAN: uninit-value in kcov_open+0x4a/0xa0
[   69.694474] CPU: 1 PID: 4815 Comm: syz-fuzzer Not tainted 4.19.0-rc4+ #54
[   69.701390] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   69.710737] Call Trace:
[   69.713338]  dump_stack+0x2f6/0x430
[   69.716981]  kmsan_report+0x183/0x2b0
[   69.720796]  kmsan_internal_check_memory+0x17e/0x1f0
[   69.725908]  kmsan_check_memory+0xb/0x10
[   69.729968]  kcov_open+0x4a/0xa0
[   69.733333]  ? kcov_mmap+0x120/0x120
[   69.737049]  open_proxy_open+0x545/0x5d0
[   69.741124]  ? debugfs_file_put+0x100/0x100
[   69.745457]  do_dentry_open+0xfb0/0x18b0
[   69.749529]  ? kmsan_memcpy_origins+0x111/0x1b0
[   69.754227]  vfs_open+0xaf/0xe0
[   69.757691]  path_openat+0x1845/0x6e50
[   69.761632]  ? kmsan_set_origin_inline+0x6b/0x120
[   69.766531]  do_filp_open+0x259/0x610
[   69.770366]  do_sys_open+0x630/0x940
[   69.774096]  __se_sys_openat+0xcb/0xe0
[   69.777991]  __x64_sys_openat+0x56/0x70
[   69.781967]  do_syscall_64+0xb8/0x100
[   69.785777]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   69.790961] RIP: 0033:0x47fcba
[   69.794147] 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
[   69.813048] RSP: 002b:000000c420031650 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
[   69.820783] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcba
[   69.828073] RDX: 0000000000080000 RSI: 000000c420094560 RDI: ffffffffffffff9c
[   69.835342] RBP: 000000c4200316d0 R08: 0000000000000000 R09: 0000000000000000
[   69.842648] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
[   69.849944] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
[   69.857229] 
[   69.858860] Local variable description: ----c.i.i.i.i@generic_permission
[   69.865699] Variable was created at:
[   69.869446]  generic_permission+0x4f/0xa90
[   69.873705]  inode_permission+0x11b/0x940
[   69.877842] 
[   69.879460] Byte 7 of 8 is uninitialized
[   69.883539] Memory access starts at ffff8801b461f810
[   69.888653] ==================================================================
[   69.896020] Disabling lock debugging due to kernel taint
[   69.901465] Kernel panic - not syncing: panic_on_warn set ...
[   69.901465] 
[   69.908840] CPU: 1 PID: 4815 Comm: syz-fuzzer Tainted: G    B             4.19.0-rc4+ #54
[   69.917155] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   69.926538] Call Trace:
[   69.929142]  dump_stack+0x2f6/0x430
[   69.932780]  panic+0x54c/0xaf7
[   69.936008]  ? __msan_metadata_ptr_for_store_1+0x13/0x20
[   69.941471]  kmsan_report+0x2a8/0x2b0
[   69.945282]  kmsan_internal_check_memory+0x17e/0x1f0
[   69.950399]  kmsan_check_memory+0xb/0x10
[   69.954461]  kcov_open+0x4a/0xa0
[   69.957829]  ? kcov_mmap+0x120/0x120
[   69.961550]  open_proxy_open+0x545/0x5d0
[   69.965659]  ? debugfs_file_put+0x100/0x100
[   69.969990]  do_dentry_open+0xfb0/0x18b0
[   69.974057]  ? kmsan_memcpy_origins+0x111/0x1b0
[   69.978742]  vfs_open+0xaf/0xe0
[   69.982030]  path_openat+0x1845/0x6e50
[   69.985956]  ? kmsan_set_origin_inline+0x6b/0x120
[   69.991048]  do_filp_open+0x259/0x610
[   69.994884]  do_sys_open+0x630/0x940
[   69.998632]  __se_sys_openat+0xcb/0xe0
[   70.002548]  __x64_sys_openat+0x56/0x70
[   70.006546]  do_syscall_64+0xb8/0x100
[   70.010363]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   70.015555] RIP: 0033:0x47fcba
[   70.018762] 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
[   70.037667] RSP: 002b:000000c420031650 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
[   70.045382] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcba
[   70.052689] RDX: 0000000000080000 RSI: 000000c420094560 RDI: ffffffffffffff9c
[   70.059961] RBP: 000000c4200316d0 R08: 0000000000000000 R09: 0000000000000000
[   70.067227] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
[   70.074491] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
[   70.082197] Kernel Offset: disabled
[   70.085837] Rebooting in 86400 seconds..