[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   38.884085] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   42.722653] random: sshd: uninitialized urandom read (32 bytes read)
[   43.187942] random: sshd: uninitialized urandom read (32 bytes read)
[   44.052717] random: sshd: uninitialized urandom read (32 bytes read)
[   44.332511] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.9' (ECDSA) to the list of known hosts.
[   50.011065] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   50.139497] ==================================================================
[   50.146946] BUG: KMSAN: uninit-value in __se_sys_waitid+0x338/0xaa0
[   50.153367] CPU: 1 PID: 4529 Comm: syz-executor510 Not tainted 4.18.0-rc8+ #34
[   50.160722] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   50.170063] Call Trace:
[   50.172657]  dump_stack+0x17c/0x1c0
[   50.176279]  kmsan_report+0x188/0x2a0
[   50.180080]  kmsan_internal_check_memory+0x17e/0x1f0
[   50.185174]  ? kmsan_set_origin+0x93/0x150
[   50.189409]  kmsan_check_memory+0xb/0x10
[   50.193462]  __se_sys_waitid+0x338/0xaa0
[   50.197511]  ? __msan_poison_alloca+0x173/0x200
[   50.202176]  ? prepare_exit_to_usermode+0x46/0x410
[   50.207102]  ? prepare_exit_to_usermode+0x13f/0x410
[   50.212107]  ? syscall_return_slowpath+0x79/0x700
[   50.216959]  __x64_sys_waitid+0x15d/0x1b0
[   50.221155]  ? __wake_up_parent+0xb0/0xb0
[   50.225310]  do_syscall_64+0x15b/0x220
[   50.229194]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   50.234420] RIP: 0033:0x455a59
[   50.237596] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
[   50.256926] RSP: 002b:00007ffe1d737888 EFLAGS: 00000207 ORIG_RAX: 00000000000000f7
[   50.264628] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000455a59
[   50.271941] RDX: 0000000020000000 RSI: 0000000000000000 RDI: 0000000000000002
[   50.279203] RBP: 00000000006e1018 R08: 0000000020000080 R09: 0000000000000000
[   50.286493] R10: 00000000a100000c R11: 0000000000000207 R12: 0000000000413760
[   50.293753] R13: 00000000004137f0 R14: 0000000000000000 R15: 0000000000000000
[   50.301031] 
[   50.302661] Local variable description: ----__pu_val131.i@__se_sys_waitid
[   50.309583] Variable was created at:
[   50.313294]  __se_sys_waitid+0x15b/0xaa0
[   50.317342]  0x2
[   50.319299] 
[   50.320917] Bytes 0-3 of 4 are uninitialized
[   50.325306] Memory access starts at ffff8801a891fd70
[   50.330389] ==================================================================
[   50.337752] Disabling lock debugging due to kernel taint
[   50.343190] Kernel panic - not syncing: panic_on_warn set ...
[   50.343190] 
[   50.350548] CPU: 1 PID: 4529 Comm: syz-executor510 Tainted: G    B             4.18.0-rc8+ #34
[   50.359280] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   50.368619] Call Trace:
[   50.371208]  dump_stack+0x17c/0x1c0
[   50.374833]  panic+0x3c3/0x9a0
[   50.378060]  ? __msan_metadata_ptr_for_store_1+0x13/0x20
[   50.383510]  kmsan_report+0x29e/0x2a0
[   50.387308]  kmsan_internal_check_memory+0x17e/0x1f0
[   50.392410]  ? kmsan_set_origin+0x93/0x150
[   50.396655]  kmsan_check_memory+0xb/0x10
[   50.400712]  __se_sys_waitid+0x338/0xaa0
[   50.404764]  ? __msan_poison_alloca+0x173/0x200
[   50.409442]  ? prepare_exit_to_usermode+0x46/0x410
[   50.414366]  ? prepare_exit_to_usermode+0x13f/0x410
[   50.419383]  ? syscall_return_slowpath+0x79/0x700
[   50.424241]  __x64_sys_waitid+0x15d/0x1b0
[   50.428386]  ? __wake_up_parent+0xb0/0xb0
[   50.432531]  do_syscall_64+0x15b/0x220
[   50.436420]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   50.441599] RIP: 0033:0x455a59
[   50.444770] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
[   50.464092] RSP: 002b:00007ffe1d737888 EFLAGS: 00000207 ORIG_RAX: 00000000000000f7
[   50.471789] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000455a59
[   50.479053] RDX: 0000000020000000 RSI: 0000000000000000 RDI: 0000000000000002
[   50.486314] RBP: 00000000006e1018 R08: 0000000020000080 R09: 0000000000000000
[   50.493570] R10: 00000000a100000c R11: 0000000000000207 R12: 0000000000413760
[   50.500933] R13: 00000000004137f0 R14: 0000000000000000 R15: 0000000000000000
[   50.508575] Dumping ftrace buffer:
[   50.512108]    (ftrace buffer empty)
[   50.515801] Kernel Offset: disabled
[   50.519420] Rebooting in 86400 seconds..