linux-kernel - Re: Hang on wireless removal..

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Message-ID: <CA+icZUVLb9Kq88yfB3kZCjDczmSaUE1vvRygPjGH6Ps+0PhDMQ@mail.gmail.com>
Date:   Mon, 8 Jun 2020 09:14:39 +0200
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Johannes Berg <johannes@...solutions.net>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        Netdev <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Hang on wireless removal..

On Sat, Jun 6, 2020 at 9:56 AM Johannes Berg <johannes@...solutions.net> wrote:
>
> Hi, sorry for the top post, on my phone.
>
> Yes, your analysis is spot on I think. I've got a fix for this in my jberg/mac80211 tree, there's a deadlock with a work struct and the rtnl.
>
> Sorry about that. My testing should've caught it, but that exact scenario didn't happen, and lockdep for disabled due to some unrelated issues at early boot,so this didn't show up... (I also sent fixes for the other issue in user mode Linux)
>

Is that the fix you are talking about?

commit 79ea1e12c0b8540100e89b32afb9f0e6503fad35
"cfg80211: fix management registrations deadlock"

- Sedat -

P.S.: I fixed up the top-post issue :-).

[1] https://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211.git/commit/?id=79ea1e12c0b8540100e89b32afb9f0e6503fad35