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Because the .zfs ctldir inodes are not backed by physical storage they use a different create path which was not properly accounting for them as used. This could result in ->nr_cached_objects() returning 0 and cause a divide by zero error in prune_super(). In my option there's a kernel bug here too which allows this to happen. They should either be checking for 0 or adding +1 like they correctly do earlier in the function. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #617 |
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