Github user neykov commented on the issue:
https://github.com/apache/brooklyn-server/pull/449
Did some more tests. Works fine on Amazon. Works fine in KVM. Works fine in
Virtualbox on an ext4 fs backed by a ramdisk.
When tracing with `strace` the blockage looks like:
```
[pid 6215] 16:16:11.362069 <... close resumed> ) = 0 <0.000125>
[pid 6214] 16:16:11.362093 <... close resumed> ) = 0 <0.000139>
[pid 6215] 16:16:11.362385
rename("/tmp/FileWriteSimpleTest$FileWriterTask.415358743301600237.txt",
"/tmp/FileWriteSimpleTest$FileWriterTask.415358743301600237.txt.renamed"
<unfinished ...>
[pid 6215] 16:16:11.362454 <... rename resumed> ) = 0 <0.000060>
[pid 6215] 16:16:11.362520
unlink("/tmp/FileWriteSimpleTest$FileWriterTask.415358743301600237.txt.renamed"
<unfinished ...>
[pid 6214] 16:16:11.362579
rename("/tmp/FileWriteSimpleTest$FileWriterTask.4885590662355799208.txt",
"/tmp/FileWriteSimpleTest$FileWriterTask.4885590662355799208.txt.renamed") = 0
<0.000015>
[pid 6214] 16:16:11.362622
unlink("/tmp/FileWriteSimpleTest$FileWriterTask.4885590662355799208.txt.renamed"
<unfinished ...>
[pid 6211] 16:16:11.363153 mprotect(0x7f45dc03e000, 4096,
PROT_READ|PROT_WRITE <unfinished ...>
[pid 6215] 16:16:11.363172 <... unlink resumed> ) = 0 <0.000646>
[pid 6214] 16:16:42.128922 <... unlink resumed> ) = 0 <30.766277>
```
It means that the `rename` call is stuck in kernel land for 30 seconds!.
That's confirmed by trying to `CTRL-C` the application which doesn't do
anything.
Given that I'm not able to reproduce in another environment I'll attribute
it to Virtualbox bugs.
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