WLAN init/deinit leaking memory -- esp_wifi_deinit() not getting called

[martijnthe]

• board: LoPy 4
• firmware version: (sysname='LoPy', nodename='LoPy', release='1.18.1.r1', version='f5d0c68 on 2018-09-06', machine='LoPy with ESP32', lorawan='1.0.2') -- it's a custom build, but very close to 1.18.1.r1.

I'm using WLAN().deinit() to (attempt) to shut down the wifi stack. All is well, but after a bunch of on/off toggling, I'm seeing error messages these (I've turned on error logging in the firmware):

W (11106275) wifi: alloc eb len=204 type=2 fail

W (11106275) wifi: m f probe rsp l=177

W (11106277) wifi: alloc eb len=204 type=2 fail

W (11106277) wifi: m f probe rsp l=177

W (11179758) wifi: alloc eb len=204 type=2 fail

W (11179758) wifi: m f probe rsp l=177

W (11179779) wifi: alloc eb len=204 type=2 fail

W (11179779) wifi: m f probe rsp l=177

It looks like the allocator that the wifi stack uses can no longer allocate blocks. I tried searching for where these messages are coming from, but I'm afraid it's coming from within one of the ESP32 binaries/static libraries.

Inspecting the modwlan.c, I noticed `esp_wifi_deinit() is not getting called. According to the header:

/**
  * @brief  Deinit WiFi
  *         Free all resource allocated in esp_wifi_init and stop WiFi task
  *
  * @attention 1. This API should be called if you want to remove WiFi driver from the system
  *
  * @return ESP_OK: succeed
  */
esp_err_t esp_wifi_deinit(void);

I'm guessing that's the bug...?

[martijnthe]

I'm guessing that's the bug...?

I did a bit more experimentation, calling WLAN().init/deinit many times in a loop. I did not hit the issue this way, so perhaps there's something else at play.

When I had hit the issue, I checked machine.info() and there was plenty of heap space (2000KB or so).

[martijnthe]

I narrow the issue down to _thread locks leaking memory: https://github.com/pycom/pycom-micropython-sigfox/issues/219

I still think it may be good to call esp_wifi_deinit() like the documentation suggests.

[iwahdan88]

This Bug is already solved in Development release , esp_wifi_deinit() is now called when you do WLAN.deinit()

I'll close the issue as it is already fixed in Dev

Thanks

[martijnthe]

@iwahdan88 thanks for the response. Re. Development release: when is the v1.19.x release going out of beta?