vsftpd: very strange bug?

[Daniel Braniss]

Hi,
I’m trying to run vsftpd for anonymous use, and have this very strange behaviour:
on host A it works just fine, but on on any other host it does not.
the binary is on a nfs server, the chdir is also to a directory on nfs, all host run the same root image FreeBSD 11.3.

truss from the working host:
55090: chdir("/")                                = 0 (0x0)
55090: chdir("/cs/ftp")                          = 0 (0x0)
55090: chroot(".")                               = 0 (0x0)
55090: setgid(0x6710)                            = 0 (0x0)
55090: setuid(0x2710)                            = 0 (0x0)
55090: setrlimit(RLIMIT_NPROC,{ cur=0,max=0 })   = 0 (0x0)
55090: access("/",W_OK)                          ERR#13 'Permission denied’

the access(…)  error is what is expected, but on the failing hosts access(…) succeeds!

7254: setgroups(0x2,0x802871000)                = 0 (0x0)
7254: chdir("/")                                = 0 (0x0)
7254: chdir("/cs/ftp")                          = 0 (0x0)
7254: chroot(".")                               = 0 (0x0)
7254: setgid(0x6710)                            = 0 (0x0)
7254: setuid(0x2710)                            = 0 (0x0)
7254: setrlimit(RLIMIT_NPROC,{ cur=0,max=0 })   = 0 (0x0)
7254: access("/",W_OK)                          = 0 (0x0)

any ideas?
thanks,
	danny