[TW#26702] Wifi driver alloc esf_buf failed when disconnect previous AP then connect to new AP

[outermanle]

Environment

• Development Kit: [ESP32-DevKitC]
• Kit version (for WroverKit/PicoKit/DevKitC): [v4]
• Core (if using chip or module): [ESP-WROOM-32D]
• IDF version (3276a13):
• Development Env: [Make]
• Operating System: [Ubuntu]
• Power Supply: [USB]

Problem Description

1. esp32 connected with AP;
2. then configure another AP info then call disconnect and reconnect the new AP.
3. WIFI driver error occurs.

Expected Behavior

Normally disconnect and try to connect another AP.

Actual Behavior

Wifi driver alloc buf failed.

Steps to repropduce

1. esp32 connected with AP;
2. then configure another AP info then call disconnect and reconnect the new AP.
3. WIFI driver error occurs.

100% reproduce this issue.

get the same error log after change sdkconfig

-CONFIG_ESP32_WIFI_STATIC_RX_BUFFER_NUM=10
-CONFIG_ESP32_WIFI_DYNAMIC_RX_BUFFER_NUM=32
+CONFIG_ESP32_WIFI_STATIC_RX_BUFFER_NUM=20
+CONFIG_ESP32_WIFI_DYNAMIC_RX_BUFFER_NUM=64
-CONFIG_ESP32_WIFI_DYNAMIC_TX_BUFFER_NUM=32
+CONFIG_ESP32_WIFI_DYNAMIC_TX_BUFFER_NUM=64

Debug Logs

E (820160) wifi: esf_buf: t=2 l=76 max:32, alloc:32 no eb
W (820170) wifi: alloc eb len=76 type=2 fail, heap:165824
W (820170) wifi: m f probe req l=0
E (820300) wifi: esf_buf: t=2 l=76 max:32, alloc:32 no eb
W (820300) wifi: alloc eb len=76 type=2 fail, heap:165840
W (820300) wifi: m f probe req l=0
E (820420) wifi: esf_buf: t=2 l=76 max:32, alloc:32 no eb
W (820420) wifi: alloc eb len=76 type=2 fail, heap:165840
W (820420) wifi: m f probe req l=0
E (820540) wifi: esf_buf: t=2 l=76 max:32, alloc:32 no eb
W (820540) wifi: alloc eb len=76 type=2 fail, heap:165840
W (820540) wifi: m f probe req l=0
E (820670) wifi: esf_buf: t=2 l=76 max:32, alloc:32 no eb
W (820670) wifi: alloc eb len=76 type=2 fail, heap:165840
W (820670) wifi: m f probe req l=0
E (820790) wifi: esf_buf: t=2 l=76 max:32, alloc:32 no eb
W (820790) wifi: alloc eb len=76 type=2 fail, heap:166036
W (820790) wifi: m f probe req l=0

[outermanle]

Any suggestion?

[outermanle]

I solve this issue. Call wifi api incorrectly may trigger wifi state machine to a wrong state.
Thanks!

[MightyPork]

@outermanle could you post a code example before/after the fix, so e.g people finding this on google can find how to solve it?

[outermanle]

@MightyPork

In my case, I call esp disable sniffer api before disconnect wifi, then error occurs, 100% reproduce it.
It works after remove disable sniffer api before disconnect wifi.

We should follow the wifi state machine designed by esp, document refer to https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/wifi.html#wi-fi-connect-phase

sometimes we call esp wifi api may trigger bug, then we may test other implement way or we can report bug with details.