On Windows ghc-pkg always reports cache out of date

When I ran ghc-pkg list on Windows, it reported that the global and user caches were out of date. As instructed, I recached both caches. Despite this, I continued to get the same error message. It appears that the timestamp on the package.conf.d directory is always a few milliseconds later than the timestamp of the package cache, even after recaching, as shown by the log excerpt below.

Original error:

C:\Users\hgolden\AppData\Roaming>ghc-pkg check
WARNING: cache is out of date: C:\Users\hgolden\AppData\Roaming\ghc\i386-mingw32-7.10.1\package.conf.d\package.cache
ghc will see an old view of this package db. Use 'ghc-pkg recache' to fix.
WARNING: cache is out of date: C:/Program Files/MinGHC-7.10.1/ghc-7.10.1\lib\package.conf.d\package.cache
ghc will see an old view of this package db. Use 'ghc-pkg recache' to fix.
[snip...]

Checking timestamps:

C:\Users\hgolden\AppData\Roaming>ghc-pkg -v2 list
Timestamp 2015-03-27 21:18:29.5247984 UTC for C:\Users\hgolden\AppData\Roaming\ghc\i386-mingw32-7.10.1\package.conf.d\pa
ckage.cache
Timestamp 2015-03-27 21:18:29.5277984 UTC for C:\Users\hgolden\AppData\Roaming\ghc\i386-mingw32-7.10.1\package.conf.d (N
EWER than cache)
WARNING: cache is out of date: C:\Users\hgolden\AppData\Roaming\ghc\i386-mingw32-7.10.1\package.conf.d\package.cache
ghc will see an old view of this package db. Use 'ghc-pkg recache' to fix.
[snip...]
Timestamp 2015-03-27 21:15:48.6285984 UTC for C:/Program Files/MinGHC-7.10.1/ghc-7.10.1\lib\package.conf.d\package.cache
Timestamp 2015-03-27 21:15:48.6835984 UTC for C:/Program Files/MinGHC-7.10.1/ghc-7.10.1\lib\package.conf.d (NEWER than c
ache)
WARNING: cache is out of date: C:/Program Files/MinGHC-7.10.1/ghc-7.10.1\lib\package.conf.d\package.cache
ghc will see an old view of this package db. Use 'ghc-pkg recache' to fix.
[snip...]

Recaching as instructed:

C:\Users\hgolden\AppData\Roaming>ghc-pkg -v2 recache --user
[snip...]
modifying: Just "C:\\Users\\hgolden\\AppData\\Roaming\\ghc\\i386-mingw32-7.10.1\\package.conf.d"
flag db stack: ["C:\\Users\\hgolden\\AppData\\Roaming\\ghc\\i386-mingw32-7.10.1\\package.conf.d"]
writing cache C:\Users\hgolden\AppData\Roaming\ghc\i386-mingw32-7.10.1\package.conf.d\package.cache
C:\Users\hgolden\AppData\Roaming>ghc-pkg -v2 recache --global
[snip...]
modifying: Just "C:/Program Files/MinGHC-7.10.1/ghc-7.10.1\\lib\\package.conf.d"
flag db stack: ["C:/Program Files/MinGHC-7.10.1/ghc-7.10.1\\lib\\package.conf.d"]
writing cache C:/Program Files/MinGHC-7.10.1/ghc-7.10.1\lib\package.conf.d\package.cache

Looking at timestamps after recaching:

C:\Users\hgolden\AppData\Roaming>ghc-pkg -v2 list
Timestamp 2015-03-27 21:21:50.3341984 UTC for C:\Users\hgolden\AppData\Roaming\ghc\i386-mingw32-7.10.1\package.conf.d\pa
ckage.cache
Timestamp 2015-03-27 21:21:50.3371984 UTC for C:\Users\hgolden\AppData\Roaming\ghc\i386-mingw32-7.10.1\package.conf.d (N
EWER than cache)
WARNING: cache is out of date: C:\Users\hgolden\AppData\Roaming\ghc\i386-mingw32-7.10.1\package.conf.d\package.cache
ghc will see an old view of this package db. Use 'ghc-pkg recache' to fix.
[snip...]
Timestamp 2015-03-27 21:23:05.4329984 UTC for C:/Program Files/MinGHC-7.10.1/ghc-7.10.1\lib\package.conf.d\package.cache
Timestamp 2015-03-27 21:23:05.4359984 UTC for C:/Program Files/MinGHC-7.10.1/ghc-7.10.1\lib\package.conf.d (NEWER than c
ache)
WARNING: cache is out of date: C:/Program Files/MinGHC-7.10.1/ghc-7.10.1\lib\package.conf.d\package.cache
ghc will see an old view of this package db. Use 'ghc-pkg recache' to fix.
C:\Users\hgolden\AppData\Roaming>

Timestamps have changed, but each directory's timestamp is still a few milliseconds after each cache file's timestamp.

Trac metadata

Trac field	Value
Version	7.10.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	ghc-pkg
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture	x86