Alan Hourihane added the comment:
It must be about pointer alignment, because that's the whole point of the
ASSERT.
As for the backtrace, the gdb support on the platform isn't great yet, but here
it is....
Breakpoint 1, ascii_decode (start=0x30c5b04 "__len__", end=0x30c5b0b "",
dest=0x1a6d592 "�������") at Objects/unicodeobject.c:4658
4658 assert(!((size_t) dest & LONG_PTR_MASK));
(gdb) bt
#0 ascii_decode (start=0x30c5b04 "__len__", end=0x30c5b0b "", dest=0x1a6d592
"�������")
at Objects/unicodeobject.c:4658
#1 0x030595a6 in .L4737 () at Objects/unicodeobject.c:4741
#2 0x03044dba in .L2648 () at Objects/unicodeobject.c:1806
#3 0x03096f54 in PyUnicode_InternFromString (cp=0x30c5b04 "__len__")
at Objects/unicodeobject.c:14284
#4 0x030c69f6 in .L1892 () at Objects/typeobject.c:6090
#5 0x030c6dc8 in add_operators (type=0x33507c8) at Objects/typeobject.c:6244
#6 0x030bfc66 in .L1249 () at Objects/typeobject.c:4182
#7 0x030bfbae in .L1241 () at Objects/typeobject.c:4146
#8 0x02ff62a8 in _Py_ReadyTypes () at Objects/object.c:1576
#9 0x0300e688 in .L60 () at Python/pythonrun.c:301
#10 0x0300ea5c in Py_InitializeEx (install_sigs=1) at Python/pythonrun.c:401
#11 0x0300ea6e in Py_Initialize () at Python/pythonrun.c:407
#12 0x02ff9fca in .L135 () at Modules/main.c:657
#13 0x02ff24be in .L6 () at ./Modules/python.c:90
#14 0x03329d5a in .L76 ()
#15 0x0331731e in .L69 ()
----------
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue17237>
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