[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   39.416221] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   42.364486] random: sshd: uninitialized urandom read (32 bytes read)
[   42.809464] random: sshd: uninitialized urandom read (32 bytes read)
[   43.834627] random: sshd: uninitialized urandom read (32 bytes read)
[   44.091281] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.31' (ECDSA) to the list of known hosts.
[   49.720232] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   49.841665] ==================================================================
[   49.849102] BUG: KMSAN: uninit-value in __se_sys_waitid+0x338/0xaa0
[   49.855501] CPU: 1 PID: 4524 Comm: syz-executor218 Not tainted 4.18.0-rc8+ #33
[   49.862853] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   49.872206] Call Trace:
[   49.874789]  dump_stack+0x17c/0x1c0
[   49.878414]  kmsan_report+0x188/0x2a0
[   49.882213]  kmsan_internal_check_memory+0x17e/0x1f0
[   49.887307]  ? kmsan_set_origin+0x93/0x150
[   49.891555]  kmsan_check_memory+0xb/0x10
[   49.895613]  __se_sys_waitid+0x338/0xaa0
[   49.899682]  ? __msan_poison_alloca+0x173/0x200
[   49.904348]  ? prepare_exit_to_usermode+0x46/0x410
[   49.909274]  ? prepare_exit_to_usermode+0x13f/0x410
[   49.914280]  ? syscall_return_slowpath+0x79/0x700
[   49.919179]  __x64_sys_waitid+0x15d/0x1b0
[   49.923327]  ? __wake_up_parent+0xb0/0xb0
[   49.927465]  do_syscall_64+0x15b/0x220
[   49.931350]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   49.936546] RIP: 0033:0x43ffe9
[   49.939719] 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 
[   49.959066] RSP: 002b:00007fffcce5feb8 EFLAGS: 00000207 ORIG_RAX: 00000000000000f7
[   49.966775] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043ffe9
[   49.974057] RDX: 0000000020000040 RSI: 0000000000000000 RDI: 0000000000000000
[   49.981320] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
[   49.988577] R10: 0000000000000000 R11: 0000000000000207 R12: 0000000000401870
[   49.995849] R13: 0000000000401900 R14: 0000000000000000 R15: 0000000000000000
[   50.003129] 
[   50.004763] Local variable description: ----__pu_val131.i@__se_sys_waitid
[   50.011671] Variable was created at:
[   50.015379]  __se_sys_waitid+0x15b/0xaa0
[   50.019431]  0x2
[   50.021389] 
[   50.023001] Bytes 0-3 of 4 are uninitialized
[   50.027419] Memory access starts at ffff8801c2e8fd70
[   50.032505] ==================================================================
[   50.039846] Disabling lock debugging due to kernel taint
[   50.045279] Kernel panic - not syncing: panic_on_warn set ...
[   50.045279] 
[   50.052656] CPU: 1 PID: 4524 Comm: syz-executor218 Tainted: G    B             4.18.0-rc8+ #33
[   50.061406] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   50.070757] Call Trace:
[   50.073351]  dump_stack+0x17c/0x1c0
[   50.076976]  panic+0x3c3/0x9a0
[   50.080209]  ? __msan_metadata_ptr_for_store_1+0x13/0x20
[   50.085671]  kmsan_report+0x29e/0x2a0
[   50.089489]  kmsan_internal_check_memory+0x17e/0x1f0
[   50.094583]  ? kmsan_set_origin+0x93/0x150
[   50.098829]  kmsan_check_memory+0xb/0x10
[   50.102880]  __se_sys_waitid+0x338/0xaa0
[   50.106932]  ? __msan_poison_alloca+0x173/0x200
[   50.111614]  ? prepare_exit_to_usermode+0x46/0x410
[   50.116551]  ? prepare_exit_to_usermode+0x13f/0x410
[   50.121558]  ? syscall_return_slowpath+0x79/0x700
[   50.126408]  __x64_sys_waitid+0x15d/0x1b0
[   50.130556]  ? __wake_up_parent+0xb0/0xb0
[   50.134693]  do_syscall_64+0x15b/0x220
[   50.138577]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   50.143754] RIP: 0033:0x43ffe9
[   50.146928] 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 
[   50.166259] RSP: 002b:00007fffcce5feb8 EFLAGS: 00000207 ORIG_RAX: 00000000000000f7
[   50.173962] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043ffe9
[   50.181236] RDX: 0000000020000040 RSI: 0000000000000000 RDI: 0000000000000000
[   50.188495] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
[   50.195772] R10: 0000000000000000 R11: 0000000000000207 R12: 0000000000401870
[   50.203053] R13: 0000000000401900 R14: 0000000000000000 R15: 0000000000000000
[   50.210732] Dumping ftrace buffer:
[   50.214263]    (ftrace buffer empty)
[   50.217962] Kernel Offset: disabled
[   50.221596] Rebooting in 86400 seconds..