linux-kernel - Re: Fwd: RCU indicates stalls with iwlwifi, causing boot failures

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Message-ID: <c3b0a87e-b680-3141-93df-911b00211ceb@intel.com>
Date:   Tue, 5 Sep 2023 09:21:45 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Hugh Dickins <hughd@...gle.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>,
        Bagas Sanjaya <bagasdotme@...il.com>,
        Lai Jiangshan <laijs@...ux.alibaba.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Gregory Greenman <gregory.greenman@...el.com>,
        Ben Greear <greearb@...delatech.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Networking <netdev@...r.kernel.org>,
        Linux Wireless <linux-wireless@...r.kernel.org>,
        Linux RCU <rcu@...r.kernel.org>
Subject: Re: Fwd: RCU indicates stalls with iwlwifi, causing boot failures

On 9/1/23 23:59, Hugh Dickins wrote:
> I just took a look at your dmesg in bugzilla: I see lots of page tables
> dumped, including "ESPfix Area", and think you're hitting my screwup: see
> 
> https://lore.kernel.org/linux-mm/CABXGCsNi8Tiv5zUPNXr6UJw6qV1VdaBEfGqEAMkkXE3QPvZuAQ@mail.gmail.com/
> 
> Please give the patch from the end of that thread a try:

Thanks, Hugh.

I tried a random commit from Linus's tree that didn't boot for me
earlier.  Applying your fix allowed me to boot!

I still can't boot Linus's _current_ tree with your patch in it, but
that looks like another failure mode altogether.