buildworld fails with "Zero byte read from file, skipping rest of line"

[Gleb Smirnoff]

  Jeremie,

On Tue, Jan 14, 2014 at 08:26:21AM +0100, Jeremie Le Hen wrote:
J> Hi,
J> 
J> I have a FreeBSD -CURRENT in Virtualbox (running on Linux).  I have been
J> unable to buildworld for a while.
J> 
J> I suspect this is not a problem with the source because I didn't see any
J> report so far, whereas I've been experiencing this for a month or more.
J> Thus I naturally suspected it was a binary problem, so I've upgraded
J> to the latest snapshot, but the problem still exists.
J> 
J>   ===> gnu/usr.bin/groff/src/libs/libgroff (all)
J>   make[6]: "/usr/obj/usr/src.svn/tmp/usr/src.svn/gnu/usr.bin/groff/src/libs/libgroff/.depend" line 3: warning: Zero byte read from file, skipping rest of line.
J>   make[6]: "/usr/obj/usr/src.svn/tmp/usr/src.svn/gnu/usr.bin/groff/src/libs/libgroff/.depend" line 3: Need an operator
J>   make[6]: "/usr/obj/usr/src.svn/tmp/usr/src.svn/gnu/usr.bin/groff/src/libs/libgroff/.depend" line 4: Need an operator
J>   make[6]: Fatal errors encountered -- cannot continue
J>   make[6]: stopped in /usr/src.svn/gnu/usr.bin/groff/src/libs/libgroff
J>   *** [all] Error code 1
J> 
J> Typscript available here:
J> http://people.freebsd.org/~jlh/typescript.buildworld.txt
J> 
J> Any ideas?

Can you try to reproduce this with unmapped I/O turned off in boot loader?

-- 
Totus tuus, Glebius.