Date: Thu, 12 Oct 2006 07:52:35 +0000
From: andrew@walrond.org
To: linux-kernel@vger.kernel.org
Subject: Re: 2.6.18 intermittent parallel build failure
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On Wed, Oct 11, 2006 at 11:25:58AM +0000, andrew@walrond.org wrote:
> When compiling the kernel on a Sun T1000 ( Niagra - 6 cores/24
> threads) with
> 
> 	make -j12
> 
> I occasionally see failures like:
> 

This was due a serious bug in gnu make; see
	https://savannah.gnu.org/bugs/?14853

This effects most of the recent make releases, and is _not_
sun/sparc/solaris specific, so don't stop reading the bug report at
the first line ;)

I've posted a patch against make-3.81 which fixes it for me.

Symptoms: Random crashing of make worker sub-processes at high -j#.
More pronounced when threads are waiting on i/o (make enables SIGCHLD
interrupts for short periods which can interrupt read(2) in the worker
threads and EINTR isn't handled)

This will likely effect anyone using large -j# on larger
multi-core/multi-processor machines, so BEWARE!

Andrew Walrond
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