fe03f7a37fd0ef05149161f6b95a25493e1fe38f

Opensuse tumbleweed

Steps to reproduce:

```
./test/functional/wallet_backup.py --descriptors
{
        allowed_syscalls.insert(__NR_brk);        
        allowed_syscalls.insert(__NR_madvise);    
        allowed_syscalls.insert(__NR_membarrier); 
        allowed_syscalls.insert(__NR_mincore);    
        allowed_syscalls.insert(__NR_mlock);      
        allowed_syscalls.insert(__NR_mmap);       
        allowed_syscalls.insert(__NR_mprotect);   
        allowed_syscalls.insert(__NR_mremap);     
        allowed_syscalls.insert(__NR_munlock);    
        allowed_syscalls.insert(__NR_munmap);     
    }
    void AllowEpoll()
    {
        allowed_syscalls.insert(__NR_epoll_create1); 
        allowed_syscalls.insert(__NR_epoll_ctl);     
        allowed_syscalls.insert(__NR_epoll_pwait);   
        allowed_syscalls.insert(__NR_epoll_wait);    
    }
    void AllowEventFd()
    {
        allowed_syscalls.insert(__NR_eventfd2); 
    }
    void AllowFileSystem()