Is anyone experiencing issues with configuring STA+AP on 5.4 GHz using DFS channels on 25.12.0-rc1?
hostapd: handle_probe_req: send failed
Along with DFS-CAC-COMPLETED and DFS -> ENABLED, but followed by DFS-PRE-CAC-EXPIRED.
(I recall this occurred in the past - issue 9298.)
I guess this post is missing device (especially wlan-) information 
(but yes, I'm seeing similar behaviour on (x86_64) main snapshots with mt7921 and mt7921au), which I'm still trying to get hold of).
Don't mark it solved, yet (it probably isn't for you - and I have bigger fish to fry, before I could debug/ bisect/ report this issue).
Just to add some substance for my experience (on x86_64 and mt7921au/ mt7921), last known-good r30767-d0c64a162a - known-broken current main/ HEAD (e.g. r32355-caef0a839a).
Same error on my Cudy WR3000H (mt7976cn) running on 25.12.0-rc1. I'm receiving this issue constantly every 30-60s.
[30 Dec 2025, 17:41:22 CET] daemon.notice: hostapd: handle_probe_req: send failed
But are you having the same issue?
STA + APs don't work?
I can't confirm it not working. The WR3000H operates as a mesh node, and I can connect to it successfully. Wi-Fi therefore appears to be functional, although it is generating error messages.
As rc2 was released, could you tell if the error was addressed? I quickly screened the changelog but I couldn't find this issue being possibly addressed. Maybe opening an issue on Github would make sense - if not already done.
No announcement in https://forum.openwrt.org/c/announcements/14.
It's not out, yet.
I can select it from my router as an updated, this is why I called it "released". Sorry if that was inaccurate.
The issue still persists in 25.12.0-rc2. To be clear (before anyone asks), the upstream is a 160 MHz channel. so aside from the congested band, I cannot use another channel in my radio domain. WAX202.
[Jan 8, 2026, 12:54:04 AM EST] daemon.notice: hostapd: phy1-ap0: DFS-CAC-COMPLETED success=1 freq=5580 ht_enabled=0 chan_offset=0 chan_width=3 cf1=5610 cf2=0 radar_detected=0
[Jan 8, 2026, 12:54:04 AM EST] daemon.notice: hostapd: phy1-ap0: interface state DFS->ENABLED
[Jan 8, 2026, 12:54:04 AM EST] daemon.notice: hostapd: phy1-ap0: AP-ENABLED
[Jan 8, 2026, 12:54:06 AM EST] daemon.notice: wpa_supplicant[1942]: phy1-sta0: Unknown event 54
[Jan 8, 2026, 12:54:06 AM EST] daemon.notice: hostapd: phy1-ap0: DFS-PRE-CAC-EXPIRED freq=5580 ht_enabled=0 chan_offset=0 chan_width=0 cf1=5580 cf2=0
[Jan 8, 2026, 12:54:06 AM EST] daemon.notice: wpa_supplicant[1942]: phy1-sta0: Unknown event 54
[Jan 8, 2026, 12:54:06 AM EST] daemon.notice: hostapd: phy1-ap0: DFS-PRE-CAC-EXPIRED freq=5600 ht_enabled=0 chan_offset=0 chan_width=0 cf1=5600 cf2=0
[Jan 8, 2026, 12:54:06 AM EST] daemon.notice: wpa_supplicant[1942]: phy1-sta0: Unknown event 54
[Jan 8, 2026, 12:54:06 AM EST] daemon.notice: wpa_supplicant[1942]: phy1-sta0: Unknown event 54
[Jan 8, 2026, 12:54:06 AM EST] daemon.notice: hostapd: phy1-ap0: DFS-PRE-CAC-EXPIRED freq=5620 ht_enabled=0 chan_offset=0 chan_width=0 cf1=5620 cf2=0
[Jan 8, 2026, 12:54:06 AM EST] daemon.notice: hostapd: phy1-ap0: DFS-PRE-CAC-EXPIRED freq=5640 ht_enabled=0 chan_offset=0 chan_width=0 cf1=5640 cf2=0
The STA connects, but the APs never come up. Last working was version 24.