Bug 163173

Description of problem:

My system is configured to use LDAP. If I have the netfs rc script enabled 
(chkconfig netfs on) and there are NFS mounts specified in /etc/fstab, the 
system will hang at "Mounting NFS filesystems" during boot.

In addition, if I disable netfs and then boot, the mount will hang when I 
run "service netfs start", or if I manually attempt to mount the NFS 
filesystem.

I _only_ see this problem when nsswitch is using ldap for hosts lookups. If I 
create a local host file entry for the NFS server(s) or put dns ahead of ldap 
in the search order, the problem does not occur. However, in my environment, I 
need to have ldap before dns.

Running strace on the mount command, it hangs with:

futex(0xa1d174, FUTEX_WAIT, 2, NULL

If I Ctrl-C, the mount command is interrupted. Sometimes, the filesystem has 
mounted but most times not.

I found a very similar bug with lots of dupes in RH9 with smbfs 
(https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=90036)

If I "export LD_ASSUME_KERNEL=2.4.1" (described in the bug/dupes) the mount 
command succeeds, so this seems to be the same basic problem.

My nsswitch.conf has the following entry:

hosts:      files ldap dns

/etc/ldap.conf has (grep -v ^# /etc/ldap.conf):

host 146.27.78.210 146.27.78.209
base dc=afis,dc=sr
port 389
ssl no
pam_password crypt

/etc/hosts has: 

127.0.0.1       localhost localhost.localdomain loopback
146.28.34.30    cpafisxy xy
146.27.78.210   cpafisxc xc
146.27.78.209   cpafisxb xb


Version-Release number of selected component (if applicable):


How reproducible:

Every Time

Steps to Reproduce:
1. Configure system to use ldap for host lookups
2. make sure nscd is NOT running
3. attempt an NFS mount command
  
Actual results:

mount command hangs

Expected results:

mount command should return

Additional info:

strace mount -t nfs cpafisc4:/util/bin /util/bin -o tcp,nfsvers=3
...
...
geteuid32()                             = 0
open("/etc/ldap.conf", O_RDONLY)        = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=8701, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 
0xb7fff000
read(3, "# @(#)$Id: ldap.conf,v 1.34 2004"..., 4096) = 4096
read(3, "d change\n# extended operation to"..., 4096) = 4096
read(3, "\n#tls_ciphers TLSv1\n\n# Client ce"..., 4096) = 509
read(3, "", 4096)                       = 0
close(3)                                = 0
munmap(0xb7fff000, 4096)                = 0
uname({sys="Linux", node="cpafisxy", ...}) = 0
futex(0xa1d174, FUTEX_WAIT, 2, NULL