After I precompiled a package in userimg.jl, require("Package_name") is 
always blocked without any response. But "using" and "import" the package 
works fine. That's weired.

If I interrupt require-ing package by Ctrl-C, the breaking point always be:

julia> require("DataFrames")
^CERROR: interrupt
 in wait at ./task.jl:277
 in wait at ./task.jl:194
 in wait_full at ./multi.jl:602
 in wait_ref at ./multi.jl:755
 in wait_ref_3B_7574 at 
/home/MyDir/programs/julia/usr/bin/../lib/julia/sys.so
 in call_on_owner at ./multi.jl:749
 in wait at ./multi.jl:756
 in _require at ./loading.jl:62
 in require at ./loading.jl:52
 in require_3B_7273 at 
/home/MyDir/programs/julia/usr/bin/../lib/julia/sys.so

FYI:
julia> versioninfo()
Julia Version 0.4.0-dev+728
Commit f7172d3* (2014-09-22 12:08 UTC)
Platform Info:
  System: Linux (x86_64-redhat-linux)
  CPU: Intel(R) Xeon(R) CPU E7- 4830  @ 2.13GHz
  WORD_SIZE: 64
  BLAS: libopenblas (USE64BITINT NO_AFFINITY NEHALEM)
  LAPACK: libopenblas
  LIBM: libopenlibm
  LLVM: libLLVM-3.3

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