Description:
Since the update to wpa_supplicant 2.8-1, my WiFi network connection at home is next to unusable. While general web browsing seems to be possible (with lots of patience), trying anything else on the network is next to impossible.

- ssh'ing to another machine on my network kind of works, but with significant lags.
- ping'ing even my access point/router times out 99% of the time
- arp-scan doesn't work at all (reports 0 other machines on the network)

Connecting to my home network via ethernet cable fixes all of the above, as well as downgrading wpa_supplicant to package version 2.6-2 brings WiFi network performance back to normal.

Additional info:
* "bad" wpa_supplicant package version: 2.8-1; "good" package version: 2.6-2
* networkmanager 1.18.0-1
* uname -a: Linux <...> 5.0.13-arch1-1-ARCH #1 SMP PREEMPT Sun May 5 18:05:41 UTC 2019 x86_64 GNU/Linux


lshw output for my wifi adapter (queried, while I am on 2.6-2):
*-network
description: Wireless interface
product: QCA6174 802.11ac Wireless Network Adapter
vendor: Qualcomm Atheros
physical id: 0
bus info: pci@0000:3a:00.0
logical name: wlp58s0
version: 32
serial: 9c:b6:d0:d3:0f:79
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=ath10k_pci driverversion=5.0.13-arch1-1-ARCH firmware=RM.4.4.1.c2-00057-QCARMSWP-1 ip=192.168.<x.x> latency=0 link=yes multicast=yes wireless=IEEE 802.11
resources: irq:136 memory:dc000000-dc1fffff

* I could not find any official upstream bug tracker (or even general info on where to post bug reports apart from than sending them directly to j at w1 dot fi, which might be a little over the top at this point) at https://w1.fi/wpa_supplicant/, so gave up trying to report there for the moment. Might be worth posting to their mailing list, but I didn't have time yet to read through their archive to see if there is any similar reports.

Steps to reproduce:
For me, it's just a matter of switching back and forth between wpa_supplicant 2.8-1 and 2.6-2, but YMMV.

Any hints on where to search for more detailed logs is highly appreciated, as I'm struggling to find more info on what is actually going wrong on 2.8-1.