[Bug 1620754] Re: hash(datetime.datetime(...)) fails with python3.5 on armhf (on an arm64 host) with a bus error
Matthias Klose
doko at ubuntu.com
Fri Sep 9 16:37:41 UTC 2016
the datetime type is defined as
#define _PyTZINFO_HEAD \
PyObject_HEAD \
Py_hash_t hashcode; \
char hastzinfo; /* boolean flag */
typedef struct
{
_PyTZINFO_HEAD
unsigned char data[_PyDateTime_DATE_DATASIZE];
} PyDateTime_Date;
and data is used to calculate the hash of the object, not being 4 byte
aligned, you get the bus error. Inserting three fill bytes, are making
the data member 4-byte aligned solves the issue, however introducing an
ABI change makes the new datetime ABI incompatible. For now I don't
know a solution to make that change and keep the ABI compatible.
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https://bugs.launchpad.net/bugs/1620754
Title:
hash(datetime.datetime(...)) fails with python3.5 on armhf (on an
arm64 host) with a bus error
Status in python-cryptography package in Ubuntu:
New
Status in python3.5 package in Ubuntu:
New
Bug description:
seen with
https://launchpad.net/ubuntu/+source/python-cryptography/1.4-2/+build/10476934
https://launchpad.net/ubuntu/+source/python-cryptography/1.5-1/+build/10678695
the TestInvalidityDate.test_invalid_invalidity_date test is the first
one to fail with a bus error. No reasonable traceback from gdb.
Trying to build python3.5, python-cffi and python-cryptography with
-mno-unaligned-access doesn't fix the issue (buildds running on a
64bit kernel).
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