linux-ext4 - Re: Strange "rm -fr" issue

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Date:	Mon, 30 Dec 2013 23:17:23 +0100
From:	Jan Kara <jack@...e.cz>
To:	Markus Trippelsdorf <markus@...ppelsdorf.de>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: Strange "rm -fr" issue

On Sun 29-12-13 15:24:06, Markus Trippelsdorf wrote:
> I came across the following strange issue today:
> 
> markus@x4 tmp % rm -fr boost
> rm: cannot remove ‘boost/results/boost/bin.v2/libs’: Directory not empty
> markus@x4 tmp % ll boost/results/boost/bin.v2/libs
> total 68K
> drwxr-xr-x 17 markus markus 4.0K Dec 29 15:01 .
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:00 ..
> drwxr-xr-x  4 markus markus 4.0K Dec 29 15:01 move
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 mpl
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 msm
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 multi_array
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 multi_index
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:00 multiprecision
> drwxr-xr-x  6 markus markus 4.0K Dec 29 15:01 numeric
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 optional
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 parameter
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 phoenix
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 polygon
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 pool
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 python
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 serialization
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 test
> markus@x4 tmp % ll boost/results/boost/bin.v2/libs
> total 140K
> drwxr-xr-x 35 markus markus 4.0K Dec 29 15:01 .
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:00 ..
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 config
> drwxr-xr-x  4 markus markus 4.0K Dec 29 15:01 move
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 mpl
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 msm
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 multi_array
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 multi_index
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:00 multiprecision
> drwxr-xr-x  6 markus markus 4.0K Dec 29 15:01 numeric
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 optional
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 parameter
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 phoenix
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 polygon
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 pool
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 predef
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 preprocessor
> drwxr-xr-x  4 markus markus 4.0K Dec 29 15:01 program_options
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 property_map
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 property_tree
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 proto
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 ptr_container
> drwxr-xr-x  4 markus markus 4.0K Dec 29 15:01 python
> drwxr-xr-x  4 markus markus 4.0K Dec 29 15:01 random
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 range
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 ratio
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 rational
> drwxr-xr-x  5 markus markus 4.0K Dec 29 15:01 regex
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 scope_exit
> drwxr-xr-x  4 markus markus 4.0K Dec 29 15:01 serialization
> drwxr-xr-x  4 markus markus 4.0K Dec 29 15:01 signals
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 signals2
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 smart_ptr
> drwxr-xr-x  4 markus markus 4.0K Dec 29 15:01 spirit
> drwxr-xr-x  3 markus markus 4.0K Dec 29 15:01 test
> markus@x4 tmp % rm -fr boost
> markus@x4 tmp % ll boost/results/boost/bin.v2/libs
> ls: cannot access boost/results/boost/bin.v2/libs: No such file or directory
> markus@x4 tmp %
  Hum, my guess would be that some other process has been adding files to
the directory while the first 'rm -fr' was running. Thus rm got a list of
files in 'libs' to delete, deleted them, tried to delete 'libs' and failed
because the other process has added some new files / dirs in the mean time.
By the time you run second rm, the creating process has apparently
finished.

								Honza

-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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