Memory leak using WiFi on nRF7002 after connect/disconnect

RE: Memory leak using WiFi on nRF7002 after connect/disconnect

Elfving — Mon, 06 Oct 2025 12:41:38 GMT

Hehe understood. No problem at all 🙂

Let us know if there is anything else!

Regards,

Elfving

RE: Memory leak using WiFi on nRF7002 after connect/disconnect

BrianW — Fri, 03 Oct 2025 15:26:49 GMT

[quote userid="103347" url="~/f/nordic-q-a/114987/memory-leak-using-wifi-on-nrf7002-after-connect-disconnect/550588"]So you do not have a DK on hand?[/quote]

No not a nrf70 one.

[quote userid="103347" url="~/f/nordic-q-a/114987/memory-leak-using-wifi-on-nrf7002-after-connect-disconnect/550588"]I would be surprised if changes to dts made a huge difference in regards to thi[/quote]

no the problem was the build, the iovdd IO was on an ioexpander, so I needed to add I2C and the MCP23xxx to the prj.conf!

Having managed to build the wifi_shell, I find that I cannot replicate the memory loss over connect/disconnect cycles (WPA2/PSK connections) -> the leak must be in my code! Mea culpa....

Sorry about that, this issue just seemed to match the observations...

RE: Memory leak using WiFi on nRF7002 after connect/disconnect

Elfving — Fri, 03 Oct 2025 12:36:42 GMT

I see. Well it seemed solved on ourside afterwards, though I guess there could be some regression.

So you do not have a DK on hand? I would be surprised if changes to dts made a huge difference in regards to this, though I can give this a go with 2.9 next week.

Regards,

Elfving

RE: Memory leak using WiFi on nRF7002 after connect/disconnect

BrianW — Thu, 02 Oct 2025 14:51:09 GMT

Well, its basically the same : connect then disconnect repeatly reduces the heap by about 100+ bytes each time.

I haven't managed to rebuild wifi-shell with my DTS in 2.9.0 currently, so can't 100% say its the wifi code - any chance you can do the test with 2.9.0 as described by Rocky ?

And last time i tried to update to 3.0.0 the increase in image size meant it wouldn't fit in the nrf5340 anymore....

RE: Memory leak using WiFi on nRF7002 after connect/disconnect

Elfving — Wed, 24 Sep 2025 07:24:03 GMT

Hi Brian,

I am not seeing anything more about than this unfortunately. If you could expand more on the memory leaks you are seeing in 2.9 that would be great, I believe what was solved here should be fixed in 2.9. Are you able to reproduce it in the same way as in the OP?

Switching to latest SDK is generally recommended though, if you are able to.

Regards,

Elfving

RE: Memory leak using WiFi on nRF7002 after connect/disconnect

Rocky — Tue, 23 Sep 2025 16:15:51 GMT

Yes, the memory leak was fixed for me in v2.6.0. However, I continued to have random issues until v3.0.0. It seems the RPU would randomly lock up and a full reboot was required for recovery. I have been having good success with v3.0.0 and an application firmware adjustment to bring down the interface between connections (net_if_down/net_if_up).

RE: Memory leak using WiFi on nRF7002 after connect/disconnect

BrianW — Tue, 23 Sep 2025 07:29:35 GMT

Hi,

I am using NCS2.9.0 with my application, and am observing the same kind of heap memory leak at each connect/disconnect cycle (of the order of 180 bytes).

Rocky did you see this as fixed in 2.6.0?

Elfving where can I find the details of the fix please?

RE: Memory leak using WiFi on nRF7002 after connect/disconnect

Elfving — Fri, 25 Oct 2024 07:08:34 GMT

Quick update: the fix will get into v2.6 as well. Once again, for more info, contact an RSM.

Regards,

Elfving

RE: Memory leak using WiFi on nRF7002 after connect/disconnect

Elfving — Fri, 18 Oct 2024 08:53:10 GMT

Hello again,

It should be fixed in the next NCS version. For info on when that releases, please contact your local RSM.

Regards,

Elfving

RE: Memory leak using WiFi on nRF7002 after connect/disconnect

Elfving — Wed, 02 Oct 2024 07:47:37 GMT

Understood.

Please contact your local RSM or FAE if you need this handled within a certain timeframe, or in any way quicker than things are currently developing.

Regards,

Elfving

RE: Memory leak using WiFi on nRF7002 after connect/disconnect

Rocky — Tue, 01 Oct 2024 13:48:29 GMT

Thank you. Please let me know if they come up with a fix or work-around. This issue is problematic in my application, which needs to sync data via wifi periodically and then go into a low power mode. After a few days the application runs out of memory and needs to be restarted.

RE: Memory leak using WiFi on nRF7002 after connect/disconnect

Elfving — Tue, 01 Oct 2024 08:13:54 GMT

I am seeing the same thing on my side. This looks like a bug. Thanks for notifying us!

I've forwarded this to appropriate team, and will update you once I hear more from them.

Regards,

Elfving

RE: Memory leak using WiFi on nRF7002 after connect/disconnect

Elfving — Fri, 27 Sep 2024 10:13:59 GMT

Hello, and thank you for your patience with this case.

Unfortunately, I have to get back to you on this next week.

Regards,

Elfving