By the way, a couple more pieces of information that may be relevant:

The problem is sensitive to the particular pattern of access to map0. If
you remove either of the two writes (at 0x0 and 0x7000) the problem
disappears, or if you change 0x7000 to a higher page it also disappears.

We also observed a message about a WRITE SAME failure in syslog. I
believe this means that the platform does not implement SCSI WRITE SAME,
which I imagine would be used to zero pages under some circumstances,
but instead uses a fallback of "manually" zeroing the pages. Perhaps
there is a problem in this area?

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https://bugs.launchpad.net/bugs/1371591

Title:
  file not initialized to 0s under some conditions on VMWare

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