[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   32.932549] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   36.904259] random: sshd: uninitialized urandom read (32 bytes read)
[   37.411764] random: sshd: uninitialized urandom read (32 bytes read)
[   38.575502] random: sshd: uninitialized urandom read (32 bytes read)
[   40.487449] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.31' (ECDSA) to the list of known hosts.
[   46.015865] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   46.129924] ==================================================================
[   46.137509] BUG: KMSAN: uninit-value in __x64_sys_sendmmsg+0x143/0x170
[   46.144165] CPU: 0 PID: 4517 Comm: syz-executor152 Not tainted 4.17.0-rc3+ #88
[   46.151504] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   46.160838] Call Trace:
[   46.163410]  dump_stack+0x185/0x1d0
[   46.167023]  ? __x64_sys_sendmmsg+0x143/0x170
[   46.171518]  kmsan_report+0x142/0x240
[   46.175316]  __msan_warning_32+0x6c/0xb0
[   46.179365]  __x64_sys_sendmmsg+0x143/0x170
[   46.183685]  do_syscall_64+0x154/0x220
[   46.187563]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   46.192729] RIP: 0033:0x4402e9
[   46.195910] RSP: 002b:00007ffdad65f3e8 EFLAGS: 00000293 ORIG_RAX: 0000000000000133
[   46.203597] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004402e9
[   46.210859] RDX: 0000000000000001 RSI: 0000000020005e00 RDI: 00000000ffffffff
[   46.218107] RBP: 00000000006ca018 R08: 0000000000000010 R09: 00000000004002c8
[   46.225379] R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000401c10
[   46.232628] R13: 0000000000401ca0 R14: 0000000000000000 R15: 0000000000000000
[   46.239880] 
[   46.241484] Local variable description: ----msg_sys@__sys_sendmmsg
[   46.247774] Variable was created at:
[   46.251471]  __sys_sendmmsg+0x9c/0x850
[   46.255338]  __x64_sys_sendmmsg+0x11c/0x170
[   46.259632] ==================================================================
[   46.266966] Disabling lock debugging due to kernel taint
[   46.272398] Kernel panic - not syncing: panic_on_warn set ...
[   46.272398] 
[   46.279741] CPU: 0 PID: 4517 Comm: syz-executor152 Tainted: G    B             4.17.0-rc3+ #88
[   46.288465] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   46.297808] Call Trace:
[   46.300401]  dump_stack+0x185/0x1d0
[   46.304011]  panic+0x39d/0x940
[   46.307202]  ? __x64_sys_sendmmsg+0x143/0x170
[   46.311678]  kmsan_report+0x238/0x240
[   46.315460]  __msan_warning_32+0x6c/0xb0
[   46.319510]  __x64_sys_sendmmsg+0x143/0x170
[   46.323819]  do_syscall_64+0x154/0x220
[   46.327700]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   46.332867] RIP: 0033:0x4402e9
[   46.336042] RSP: 002b:00007ffdad65f3e8 EFLAGS: 00000293 ORIG_RAX: 0000000000000133
[   46.343739] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004402e9
[   46.350992] RDX: 0000000000000001 RSI: 0000000020005e00 RDI: 00000000ffffffff
[   46.358249] RBP: 00000000006ca018 R08: 0000000000000010 R09: 00000000004002c8
[   46.365514] R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000401c10
[   46.372769] R13: 0000000000401ca0 R14: 0000000000000000 R15: 0000000000000000
[   46.380577] Dumping ftrace buffer:
[   46.384104]    (ftrace buffer empty)
[   46.387803] Kernel Offset: disabled
[   46.391410] Rebooting in 86400 seconds..