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Date: Tue, 12 Nov 2013 16:04:10 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>, acme@ghostprotocols.net,
        linux-kernel@vger.kernel.org, Frederic Weisbecker <fweisbec@gmail.com>,
        Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
        Mike Galbraith <efault@gmx.de>, Stephane Eranian <eranian@google.com>
Subject: Re: [PATCH] perf record: Delete file if a failure occurs writing the
 perf data file
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On Tue, Nov 12, 2013 at 07:51:16AM -0700, David Ahern wrote:
> > From man mmap:
> >        SIGBUS Attempted access to a portion of the buffer that
> >        does not correspond  to  the  file (for  example, beyond
> >        the end of the file, ...

SIGBUS is basically the std fail for any fault; there's a ton more
reasons than listed in that manpage.

Failing to dirty a page due to -ENOSPACE is one reason we'll
trigger SIGBUS -- as you already found in that memcpy to mmap() instead
of write() patch.