Bug 441878

Description of problem:
Please note that this is in addition to the issue fixed by the patch in bug
434826.  Since the only way to test the fix was to try an install with an
anaconda image built from the new libnl I was unable to test this until the
previous fix was pulled into RHEL5.2 which didn't happen until last night.

That patch does make things better but we still hit unaligned accesses during
stage1 anaconda:

loader(761): unaligned access to 0x60000000001a2b54, ip=0x40000000000e4420
loader(761): unaligned access to 0x60000000001a2b5c, ip=0x40000000000e4430
loader(761): unaligned access to 0x60000000001a2d3c, ip=0x40000000000e43e0
loader(761): unaligned access to 0x60000000001a2d44, ip=0x40000000000e4420


I dug through the binaries and did some dissasembly and found these ip's resolve
to these lines of code in link_msg_parser():

lib/route/link.c:289
                link->l_mask |= LINK_ATTR_MAP;

lib/route/link.c:293
                link->l_master = nla_get_u32(tb[IFLA_MASTER]);

lib/route/link.c:294
                link->l_mask |= LINK_ATTR_MASTER;

I have confirmed the offsets of l_mask and l_master are properly aligned, so it
would appear the problem is that link itself is not aligned properly.

I manually traced the code to figure out how "link" is allocated:

lib/route/link.c:188
        link = rtnl_link_alloc();

lib/route/link.c:599
        return (struct rtnl_link *) nl_object_alloc_from_ops(&rtnl_link_ops);


lib/object.c:70
        new = nl_object_alloc(ops->co_size);

lib/object.c:49
        new = calloc(1, size);


Not sure at all how this is possible.  Unless there is some way to trick it
calloc should never be able to return an unaligned pointer.  Perhaps my
assumption is wrong here.  I need to find a way to reproduce this outside of
anaconda.


Version-Release number of selected component (if applicable):
libnl-1.0-0.10.pre5.5

How reproducible:
100%

Steps to Reproduce:
1. do a network based install on ia64
2. note unaligned access messages during anaconda stage1
3.
  
Actual results:


Expected results:


Additional info: