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FS#3881 - Kernel crash in wireless stack (mac80211/ath9k) #8874

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openwrt-bot opened this issue Jun 16, 2021 · 4 comments
Closed

FS#3881 - Kernel crash in wireless stack (mac80211/ath9k) #8874

openwrt-bot opened this issue Jun 16, 2021 · 4 comments
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@openwrt-bot
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vampik:

  • Device problem occurs on
    x86-64 KVM virtual machine with Qualcomm Atheros AR9462 Wireless Network Adapter (ath9k kernel driver)
  • Software versions of OpenWrt/LEDE release, packages, etc.
    OpenWrt SNAPSHOT r16957-3d026d2425
  • Steps to reproduce
  1. Enable Wi-Fi access point
  2. Connect a Wi-Fi client to this access point
  3. After a few seconds the crash occurs

I'm encountering kernel crashes after updating from OpenWrt SNAPSHOT r16915-bb749e49a6 to OpenWrt SNAPSHOT r16957-3d026d2425. The crash occurs a few seconds after a client is connected to Wi-Fi access point. The crash doesn't occur if Wi-Fi is disabled or if there is no clients connected to AP.
The system stops responding after the crash so I'm not able to provide the full crash log. I can only provide the screenshot of the virtual machine console after the crash which contains the last few lines (see the attached file).
@openwrt-bot
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vampik:

After some investigation I've found that there were 2 commits to mac80211 between r16915-bb749e49a6 and r16957-3d026d2425:

7dd8829 mac80211: improve rate control performance
f2c6d89 mac80211: add support for 802.3 encap offload with software rate control

After reverting these commits everything works fine - no crashes!

I'll try to figure out which of these 2 commits causes the crash. But it will take some time.

@openwrt-bot
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vampik:

I've made some tests and found that the crash is caused by this commit:

7dd8829 mac80211: improve rate control performance

@openwrt-bot
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vampik:

I also want to note that it seems to be hardware or driver specific.

Router with Qualcomm Atheros AR9462 (ath9k driver) crashes.
But router with a Mediatek Wi-Fi chip (mt76 driver) doesn't crash.

@openwrt-bot
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nbd:

I was able to reproduce the issue and fixed it in latest master: a603e82

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