RE: RedHat ES4 boot hangs mounting NFS filesystems

["Collins, Kevin (MindWorks)" <KCollins chevron com>]

Title: RedHat ES4 boot hangs mounting NFS filesystems

Just as a follow up, I narrowed this problem down to specifically the mount command. After running 'strace mount' I realized it was hanging on a futex() call (with FUTEX_WAIT). Some Google searching turned up very similar bugs in RH9 (https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=90036), but in that case it was with smbfs mounts (also handled by the netfs rc script).

 

I'm now trying to identify if there is already a bug submitted for this against ES4, but my bugzilla kung-fu is not strong :)  Anyone else experienced this problem or seen this bug reported? If not, I'll report it myself.

 

The listed workaround of setting LD_ASSUME_KERNEL to a non-NPTL kernel version works, but I would like to get the bug fixed.

 

Thanks,

 

Kevin

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From: nahant-list-bounces redhat com [mailto:nahant-list-bounces redhat com] On Behalf Of Collins, Kevin (MindWorks)
Sent: Tuesday, July 12, 2005 9:52 AM
To: nahant-list redhat com
Cc: ldap-interop fini net
Subject: RedHat ES4 boot hangs mounting NFS filesystems

Hi,

        I converted a RedHat ES4 system to use LDAP (it was previously using NIS) yesterday. Now, when I attempt a boot, the system hangs at "Mounting NFS Filesystems" (part of the /etc/init.d/netfs rc script). I have an ES3 system configured the same and it works fine.

I have narrowed the problem down to using LDAP for hostname resolution in /etc/nsswitch.conf:

hosts:      files ldap dns

The NFS host (one server for all mounts in question) is in both LDAP and DNS. If I attempt booting with this configuration the system hangs trying to mount NFS filesystems.

Any of the following fix the problem:

1) add the host in question to /etc/hosts
2) put dns before ldap in nsswitch.conf
3) change /etc/fstab to use the IP address of the NFS server

If I boot to runlevel 2 (before NFS mounts occur), I can login and run 'getent' successfully and it immediately returns the information from LDAP (I can tell because LDAP has aliases and DNS doesn't). If I then try an init to runlevel 3 or 5, it hangs at the NFS mount step.

Does anyone have any ideas? I can't put DNS ahead of LDAP in the search order because DNS is outside my group's control and we need to have changes available at near-realtime.

I've carbon-copied the LDAP Interop list as well, hoping someone can help.

Thanks,

Kevin