tracing + specialization + EXTENDED_ARG = assertion failure #91869
Description
I found this while working on #91713
def f(x):
( # EXTENDED_ARG + UNPACK_SEQUENCE
y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y,
y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y,
y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y,
y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y,
y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y,
y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y,
y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y,
y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y,
y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y,
y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y, y,y,y,y,y,
) = x
for _ in range(20):
f(range(300)) # warmup
import sys
sys.settrace(print)
f(range(300)) # assertion failureThis results in Assertion failed: cframe.use_tracing == 0, from here, in the UNPACK_SEQUENCE_ADAPTIVE instruction. Presumably, other specialized opcodes are similar.