[Tickets #12906] Horde doesn't work on NFS

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Ticket URL: http://bugs.horde.org/ticket/12906
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  Ticket             | 12906
  Created By         | bra at fsn.hu
  Summary            | Horde doesn't work on NFS
  Queue              | Horde Base
  Version            | 5.1.5
  Type               | Bug
  State              | Unconfirmed
  Priority           | 2. Medium
  Milestone          |
  Patch              |
  Owners             |
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bra at fsn.hu (2014-01-08 09:02) wrote:

I've a recently upgraded Horde from FreeBSD packages. The server runs  
from a read only NFS server, so every directory and file are on NFS  
and are read only.
When I log into Horde, I get the following error:
[08-Jan-2014 09:46:44 Europe/Budapest] PHP Fatal error:  Call to  
undefined method PEAR_Error::getName() in  
/usr/local/share/pear/Horde/Core/Db/Migration.php on line 93

Placing two debug log statements around that line:
-----------------------------------8<-----------------------------------
        foreach (glob($pear->get('data_dir') . '/*/migration') as $dir) {
                 Horde::log("XXX ".$dir, Horde_Log::ERR);
                 Horde::log("XXX  
".$registry->getPackage(basename(dirname($dir)),
  'pear.horde.org'), Horde_Log::ERR);
             $app = $registry->getPackage(
-----------------------------------8<-----------------------------------
revealed the following:
Jan  8 09:46:44 [imp] XXX  
/usr/local/share/pear/data/Horde_ActiveSync/migration [pid 2333 on  
line 90 of "/usr/local/share/pear/Horde/Core/Db/Migration.php"]
Jan  8 09:46:44 [imp] XXX could not acquire shared lock  
(/usr/local/share/pear/.lock) [pid 2333 on line 91 of  
"/usr/local/share/pear/Horde/Core/Db/Migration.php"]

Doing a ktrace on the php process gives:
   2333 php-fpm  CALL  open(0x810f64348,0<O_RDONLY>,<unused>0)
   2333 php-fpm  NAMI  "/usr/local/share/pear/.lock"
   2333 php-fpm  RET   open 16/0x10
   2333 php-fpm  CALL  fstat(0x10,0x8112bc540)
   2333 php-fpm  STRU  struct stat {dev=973143809, ino=3195588,  
mode=-rw-r--r-- , nlink=1, uid=0, gid=0, rdev=42672,  
atime=1389170490.846139742, stime=1389170490.846139742,  
ctime=1389170490.846139742, birthtime=-1, size=0, blksize=4096,  
blocks=1, flags=0x0 }
   2333 php-fpm  RET   fstat 0
   2333 php-fpm  CALL  lseek(0x10,0,SEEK_CUR)
   2333 php-fpm  RET   lseek 0
   2333 php-fpm  CALL  flock(0x10,0x1<LOCK_SH>)
   2333 php-fpm  RET   flock -1 errno 45 Operation not supported

which makes sense, flock over NFS doesn't work. Last year this setup  
worked. What has changed since then?
Could you please correct, or work around this to make Horde runnable  
over NFS again?