netdev - NetworkManager fails to start

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Message-ID: <YMjTlp2FSJYvoyFa@unreal>
Date:   Tue, 15 Jun 2021 19:21:42 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Kees Cook <keescook@...omium.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Christian Brauner <christian.brauner@...ntu.com>,
        Andrea Righi <andrea.righi@...onical.com>,
        stable@...r.kernel.org, linux-netdev <netdev@...r.kernel.org>
Subject: NetworkManager fails to start

Hi,

The commit 591a22c14d3f ("proc: Track /proc/$pid/attr/ opener mm_struct")
that we got in v5.13-rc6 broke our regression to pieces. The NIC interfaces
fail to start when using NetworkManager.

There is nothing in dmesg except error that NetworkManager failed to start.

Our setups are:
 * VMs with virtio-net NICs
 * Fedora 29

The revert fixes the issue and VMs boot with network working.

Thanks