[Xastir-Dev] Bus errors

[Jack Twilley]

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>>>>> "Curt" == Curt Mills <Curt> writes:

[... my bus error report ...]

Curt> Undoubtedly.  Bus Error is Mac-specific or perhaps FreeBSD or
Curt> Solaris, right?  I don't recall seeing that on an x86 platform
Curt> before.  As I recall, Bus Error means that you're out of word
Curt> alignment for memory accesses, meaning we bumped a pointer by an
Curt> odd number of bytes.

A bus error is indeed an alignment error.  In this case, the bus error
is the immediate result -- the real bug is accessing free'd memory
which had been reset to 0xd0 -- a FreeBSD-specific thing to help
people find bad code.

Curt> That can be caused either by a bad pointer (pointing to
Curt> something that has already been free'd) or by doing pointer
Curt> arithmetic poorly.  Sounds like in this case it's the former.

I have confirmed that it's a bad pointer.  I just wish I knew better
how to track it down.  It's somewhere in that linked list.

Jack.
- -- 
Jack Twilley
jmt at twilley dot org
http colon slash slash www dot twilley dot org slash tilde jmt slash
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