Fatal glibc error: cannot get entropy for arc4random

[Arkadiusz Miśkiewicz]

On 19/07/2024 12:48, Elan Ruusamäe wrote:
> openssh is unable startup
> 
> # service sshd restart
> Fatal glibc error: cannot get entropy for arc4random
> Aborted
> 
> # rpm -q glibc openssh-server
> glibc-2.39-6-th.x86_64
> openssh-server-9.8p1-1-th.x86_64
> 
> # uname -r
> 3.13.0-32-generic
> 
> from quick internet search 3.15 kernel is needed? but not specified 
> in .spec?

Hm, why 3.15?

Looking at the arc4random code it fallbacks to /dev/random and 
/dev/urandom if syscall is not available (getrandom syscall was 
introduced in 3.17).

Maybe sshd is not allowing access to these at that point?

strace could tell us something.

-- 
Arkadiusz Miśkiewicz, arekm / ( maven.pl | pld-linux.org )