netdev - Re: Fwd: After kernel 6.3.7 or 6.3.8 b43 driver fails

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Date: Sat, 24 Jun 2023 23:32:52 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Bagas Sanjaya" <bagasdotme@...il.com>,
 "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
 "Linux Regressions" <regressions@...ts.linux.dev>,
 "Linux Wireless" <linux-wireless@...r.kernel.org>,
 Netdev <netdev@...r.kernel.org>
Cc: Michael Büsch <m@...s.ch>,
 "kernel test robot" <lkp@...el.com>,
 "Simon Horman" <simon.horman@...igine.com>,
 "Larry Finger" <Larry.Finger@...inger.net>, "Kalle Valo" <kvalo@...nel.org>,
 sardonimous@...mail.com
Subject: Re: Fwd: After kernel 6.3.7 or 6.3.8 b43 driver fails

On Sat, Jun 24, 2023, at 03:44, Bagas Sanjaya wrote:
> I notice a regression report on Bugzilla [1]. Quoting from it:
>
>> After upgrading to linux 6.3.8-arch1-1 from 6.3.6-arch1-1, b43 broadcom wireless driver fails.  downgrading back to 6.3.6-arch1-1 resolves.
>> 
>> Jun 16 20:56:37 askasleikir kernel: Hardware name: Apple Inc. MacBookPro7,1/Mac-F222BEC8, BIOS MBP71.88Z.0039.B15.1702241313 02/24/17
>> Jun 16 20:56:37 askasleikir kernel: Workqueue: phy0 b43_tx_work [b43]
>> Jun 16 20:56:37 askasleikir kernel: RIP: 0010:__ieee80211_stop_queue+0xcc/0xe0 [mac80211]

FWIW, the report is missing a few lines at the top about
which error condition is being hit.

>> Jun 16 20:56:37 askasleikir kernel: <TASK>
>> Jun 16 20:56:37 askasleikir kernel: ? __ieee80211_stop_queue+0xcc/0xe0 [mac80211 136d1d948548ad6cca697df0da0a13c0a2333310]
>> Jun 16 20:56:37 askasleikir kernel: ? __warn+0x81/0x130
>> Jun 16 20:56:37 askasleikir kernel: ? __ieee80211_stop_queue+0xcc/0xe0 [mac80211 136d1d948548ad6cca697df0da0a13c0a2333310]
>> Jun 16 20:56:37 askasleikir kernel: ? report_bug+0x171/0x1a0
>> Jun 16 20:56:37 askasleikir kernel: ? handle_bug+0x3c/0x80
>> Jun 16 20:56:37 askasleikir kernel: ? exc_invalid_op+0x17/0x70
>> Jun 16 20:56:37 askasleikir kernel: ? asm_exc_invalid_op+0x1a/0x20
>> Jun 16 20:56:37 askasleikir kernel: ? __ieee80211_stop_queue+0xcc/0xe0 [mac80211 136d1d948548ad6cca697df0da0a13c0a2333310]
>> Jun 16 20:56:37 askasleikir kernel: ieee80211_stop_queue+0x36/0x50 [mac80211 136d1d948548ad6cca697df0da0a13c0a2333310]

This indicates that a WARN_ON() was hit in __ieee80211_stop_queue(),
and the only condition that could cause this is

        if (WARN_ON(queue >= hw->queues))
                return;

Maybe that helps figure out what went wrong. 

        Arnd