[FS#3228] ath10k_pci 0000:00:00.0: firmware crashed (Attachment added)

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FS#3228 - ath10k_pci 0000:00:00.0: firmware crashed
User who did this - Ulrich Mayer (umayer)

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This might be an upstream problem, please point me to the right tracking system if here is not the right place to report this bug.

A few weeks ago I decided to try roaming on my wifi at home. 
Setup: 2x Archer C7 v5 as AP, 1x Archer C7 v2 as router, DAWN (i.e. 802.11krv, also 802.11w which I currently don't knowingly use)
I experianced firmware crashes with kernel 4.19, but decided to wait until kernel 5.4 made it into snapshots.
The bug report is from an AP.

After more than 20 times of
Wed Jul  8 13:00:41 2020 kern.warn kernel: [ 7797.345447] ath10k_pci 0000:00:00.0: SWBA overrun on vdev 0, skipped old beacon

I get firmware crashes. The logfiles captured 3:

kernel-fail2:Wed Jul  8 13:00:44 2020 kern.err kernel: [ 7800.322765] ath10k_pci 0000:00:00.0: Cannot communicate with firmware, previous wmi cmds: 36891:1874286 36904:1874286 36952:1874264 40859:1874264, jiffies: 1875073, attempting to fake crash and restart firmware, dev-flags: 0x42
kernel-fail2:Wed Jul  8 13:00:44 2020 kern.err kernel: [ 7800.393197] ath10k_pci 0000:00:00.0: firmware crashed! (guid ac5c19c8-a67a-4669-bb2c-e7dbd341642b)
kernel-fail2:Wed Jul  8 13:18:06 2020 kern.err kernel: [ 8842.746412] ath10k_pci 0000:00:00.0: Cannot communicate with firmware, previous wmi cmds: 36891:2134867 36904:2134866 36954:2134752 36952:2134657, jiffies: 2135680, attempting to fake crash and restart firmware, dev-flags: 0x42
kernel-fail2:Wed Jul  8 13:18:07 2020 kern.err kernel: [ 8842.830762] ath10k_pci 0000:00:00.0: firmware crashed! (guid 48ca0542-2372-4a1b-a014-32a8037305ab)
fail 2 shows up again in kernel-fail3 in addition to the 3rd fail:
kernel-fail3:Wed Jul  8 14:21:45 2020 kern.err kernel: [12662.004832] ath10k_pci 0000:00:00.0: Cannot communicate with firmware, previous wmi cmds: 36891:3089744 36904:3089743 36952:3089576 40859:3089576, jiffies: 3090496, attempting to fake crash and restart firmware, dev-flags: 0x42
kernel-fail3:Wed Jul  8 14:21:46 2020 kern.err kernel: [12662.080578] ath10k_pci 0000:00:00.0: firmware crashed! (guid a5421a2b-97e2-45bc-b152-b2e4804b327f)
uptime:
 14:22:29 up  3:31,  load average: 0.46, 0.16, 0.07


Model
  TP-Link Archer C7 v5
Architecture
  Qualcomm Atheros QCA956X ver 1 rev 0
Firmware Version
  OpenWrt SNAPSHOT r13710-7cb721c03f / LuCI Master git-20.186.82618-556e354
Kernel Version
  5.4.50
Firmware (unchanged from snapshot):
  /lib/firmware/ath10k/QCA988X/hw2.0/firmware-2.bin


opkg remove wpad-basic kmod-ath10k-ct
opkg install avahi-daemon-service-http avahi-nodbus-daemon \
             wpad-openssl  \
             kmod-ath10k-ct-smallbuffers
opkg install luci luci-app-dawn


I tested roaming by transferring large files from my NAS to the mobile device while walking throught the house. 
The handover mostily works nicely, but sometimes the clien needs to re-authenticate.

Please let me know if you need more details or config files.
I'd happily assist debugging by performing experients.

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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3228#comment8556

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