[panic report] sys_timeout: timeout != NULL, pool MEMP_SYS_T

[tommycusick]

CircuitPython version

Adafruit CircuitPython 9.0.5 on 2024-05-22; Raspberry Pi Pico W with rp2040

Code/REPL

import os

import asyncio
import board
import digitalio

import biplane


server = biplane.Server()


@server.route("/", "GET")
def root(query_parameters, headers, body):
  return biplane.Response("<b>Hello, world!</b>", content_type="text/html")


async def run_server():
  for _ in server.circuitpython_start_wifi_station(
     os.getenv('CIRCUITPY_WIFI_SSID'),
     os.getenv('CIRCUITPY_WIFI_PASSWORD'),
     os.getenv('BIPLANE_MDNS_HOSTNAME')):
    await asyncio.sleep(0)  # let other tasks run


async def blink_builtin_led(pin, blink_hz=10):
  with digitalio.DigitalInOut(pin) as led:
    led.switch_to_output(value=False)
    while True:
      led.value = not led.value
      await asyncio.sleep(1. / blink_hz)


if __name__ == '__main__':
    asyncio.run(
       asyncio.gather(
          blink_builtin_led(board.LED),
          run_server(),
        )
    )

Behavior

Code stopped by auto-reload. Reloading soon.
soft reboot

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code.py output:
starting mDNS at kittyfood.local (IP address 10.0.1.200)

*** PANIC ***

sys_timeout: timeout != NULL, pool MEMP_SYS_T

Description

No response

Additional information

No response

[jepler]

static void
#if LWIP_DEBUG_TIMERNAMES
sys_timeout_abs(u32_t abs_time, sys_timeout_handler handler, void *arg, const char *handler_name)
#else /* LWIP_DEBUG_TIMERNAMES */
sys_timeout_abs(u32_t abs_time, sys_timeout_handler handler, void *arg)
#endif
{
  struct sys_timeo *timeout, *t;

  timeout = (struct sys_timeo *)memp_malloc(MEMP_SYS_TIMEOUT);
  if (timeout == NULL) {
    LWIP_ASSERT("sys_timeout: timeout != NULL, pool MEMP_SYS_TIMEOUT is empty", timeout != NULL);
    return;
  }

An allocation inside of lwip is failing, and this leads to an assertion failure.

You could pursue this by trying to determine whether this define (in ports/raspberrypi/lwip_inc/lwipopts.h) is wrong or inadequate (I probably committed this but don't remember how I determined the value)

#define MEMP_NUM_SYS_TIMEOUT        (8 + 3 * (LWIP_IPV4 + LWIP_IPV6))

[eightycc]

It's likely that this issue was resolved by #10027. Needs re-test.

[eightycc]

Tested with current tip of main (10.0.0-alpha.4-5-g07ec0c6d09). Works correctly. Test code serves webpage. No panic.