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Re: kern/48135: Bad locking for umount

The following reply was made to PR kern/48135; it has been noted by GNATS.

From: Michael van Elst <>
Subject: Re: kern/48135: Bad locking for umount
Date: Thu, 22 Aug 2013 19:42:37 +0200

 On Thu, Aug 22, 2013 at 10:40:00AM +0000, J. Hannken-Illjes wrote:
 >  Btw.: I'm not able to reproduce this error here -- what exactly is
 >        your setup (amd configuration etc.)
 It's a dual core amd64 machine that mounts an NFS server.
 restart_mounts    = yes
 map_type          = file
 search_path       = /etc/amd
 dismount_interval = 3
 cache_duration    = 3
 auto_attrcache    = 1
 log_options       = all
 [ /a ]
 map_name      = pussyfoot
 and the map:
 source \
        -type:=nfs;opts:=rw,nosuid,nodevs,intr,nfsv3,readdirplus,proto=tcp \
 The race condition happens after setting auto_attrcache=1, but it might
 have been triggered before.
 The "fix" prevents this race, but it surely opens others.
                                 Michael van Elst
                                 "A potential Snark may lurk in every tree."

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