Getting a lot of runtime misaligned address error while building python 2.7.6 with UBSAN

[dibyaranjanmishra]

BPO	36803
Nosy	@zware

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2020-04-27.02:04:28.440>
created_at = <Date 2019-05-05.15:33:43.368>
labels = ['type-bug', 'build']
title = 'Getting a lot of runtime misaligned address error while building python 2.7.6 with UBSAN'
updated_at = <Date 2020-04-27.02:04:28.438>
user = 'https://bugs.python.org/dibyaranjanmishra'

bugs.python.org fields:

activity = <Date 2020-04-27.02:04:28.438>
actor = 'zach.ware'
assignee = 'none'
closed = True
closed_date = <Date 2020-04-27.02:04:28.440>
closer = 'zach.ware'
components = ['Build']
creation = <Date 2019-05-05.15:33:43.368>
creator = 'dibya ranjan mishra'
dependencies = []
files = []
hgrepos = []
issue_num = 36803
keywords = []
message_count = 2.0
messages = ['341453', '367350']
nosy_count = 2.0
nosy_names = ['zach.ware', 'dibya ranjan mishra']
pr_nums = []
priority = 'normal'
resolution = 'out of date'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue36803'
versions = ['Python 2.7']

[dibyaranjanmishra]

I downloaded python 2.7.6 source and am trying to build with UBSAN flag following the instructions https://devguide.python.org/clang/. But I am getting a lot of misaligned address errors when I run make or make test command. Below is an example:

Objects/listobject.c:161:5: runtime error: member access within misaligned address 0x2adff0773228 for type 'struct (anonymous struct at Include/objimpl.h:253:5)', which requires 16 byte alignment

I need this ubsan enabled python 2.7 as a part of my project.

[zware]

As Python 2.7 has reached EOL, I'm closing this issue. However, if you can reproduce the problem with a modern version of Python (3.6-3.8), please reopen it and adjust the versions field appropriately.