linux-kernel - Re: [PATCH 5.12 4/5] cfg80211: fix locking in netlink owner interface destruction

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Message-ID: <1669b7da-173b-c5d5-efd3-72ca64a3e221@skogtun.org>
Date:   Fri, 30 Apr 2021 17:04:22 +0200
From:   Harald Arnesen <harald@...gtun.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Cc:     stable@...r.kernel.org, Johannes Berg <johannes.berg@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 5.12 4/5] cfg80211: fix locking in netlink owner interface
 destruction

Greg Kroah-Hartman [30.04.2021 16:20]:

> From: Johannes Berg <johannes.berg@...el.com>
> 
> commit ea6b2098dd02789f68770fd3d5a373732207be2f upstream.
> 
> Harald Arnesen reported [1] a deadlock at reboot time, and after
> he captured a stack trace a picture developed of what's going on:
> 
> The distribution he's using is using iwd (not wpa_supplicant) to
> manage wireless. iwd will usually use the "socket owner" option
> when it creates new interfaces, so that they're automatically
> destroyed when it quits (unexpectedly or otherwise). This is also
> done by wpa_supplicant, but it doesn't do it for the normal one,
> only for additional ones, which is different with iwd.

I just want to point out that the distribution (Void Linux) can use
either wpa_supplicant or iwd. I just happened to use iwd on this machine.
-- 
Hilsen Harald