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

[Michael Butler]

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On 01/15/14 03:40, Gleb Smirnoff wrote:
>   Jeremie,
> 
> On Wed, Jan 15, 2014 at 08:40:53AM +0100, Jeremie Le Hen wrote:
> J> > J>   ===> gnu/usr.bin/groff/src/libs/libgroff (all)
> J> > 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> > 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> > 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> > J>   make[6]: Fatal errors encountered -- cannot continue
> J> > J>   make[6]: stopped in /usr/src.svn/gnu/usr.bin/groff/src/libs/libgroff
> J> > J>   *** [all] Error code 1
> J> > J> 
> J> > J> Typscript available here:
> J> > J> http://people.freebsd.org/~jlh/typescript.buildworld.txt
> J> > J> 
> J> > J> Any ideas?
> J> > 
> J> > Can you try to reproduce this with unmapped I/O turned off in boot loader?
> J> 
> J> I've never heard of that.  Can you please point me to the right
> J> code/doc?
> 
> In loader prompt:
> 
> OK set vfs.unmapped_buf_allowed=0
> OK boot

I'm seeing this on a non-virtualized laptop.

Core Duo T2300 (1.8GHz Prescott architecture)

Occurs randomly with either IDE or AHCI enabled on ICH-7 or on a USB
external drive.

Seems to only occur under heavy loads such as recompiling libreoffice,
KDE or similar.

Maybe a race condition in buffer management?

	imb


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