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rp2: Memory error in thread allocation #7981
Description
Saw this on stackoverflow: https://stackoverflow.com/questions/69796458/is-there-a-memory-leak-in-micropython-hex-function
Here's a simple repro (that also shows the issue isn't with hex). If you run it with a smaller number of iterations (i.e. 0x1000) or not in a thread, it successfully runs to completion and prints "finished".
import _thread
def test():
for i in range(0x1800):
bytes(0)
print("finished")
_thread.start_new_thread(test, ())Note that it does successfully trigger an automatic collection, then fails about 144 allocations later. (Add print(gc.mem_free()) before the bytes(0) to see this).
Activity
peterhinch commentedon Nov 9, 2021
See also this forum post.
manpowre commentedon Nov 12, 2021
Its not the same issue, I tried this code here with gc.threshold(5423) and lower, and it still crashes.
rp2/mpthreadport: Fix memory corruption when thread is created in core1.
dpgeorge commentedon Mar 1, 2022
Fixed by 2d47020
rp2/mpthreadport: Fix memory corruption when thread is created in core1.
rp2/mpthreadport: Fix memory corruption when thread is created in core1.