linux-kernel - [stable 4.4, 4.9, 4.14, 4.19 LTS] Missing fix "memcg: fix a crash in wb

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Date:   Wed, 10 Feb 2021 11:04:19 -0500 (EST)
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     stable <stable@...r.kernel.org>
Cc:     Theodore Ts'o <tytso@....edu>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Chris Mason <clm@...com>, Tejun Heo <tj@...nel.org>,
        Jens Axboe <axboe@...nel.dk>, rostedt <rostedt@...dmis.org>,
        Michael Jeanson <mjeanson@...icios.com>
Subject: [stable 4.4, 4.9, 4.14, 4.19 LTS] Missing fix "memcg: fix a crash
 in wb_workfn when a device disappears"

Hi,

While reconciling the lttng-modules writeback instrumentation with its counterpart
within the upstream Linux kernel, I notice that the following commit introduced in
5.6 is present in stable branches 5.4 and 5.5, but is missing from LTS stable branches
for 4.4, 4.9, 4.14, 4.19:

commit 68f23b89067fdf187763e75a56087550624fdbee
("memcg: fix a crash in wb_workfn when a device disappears")

Considering that this fix was CC'd to the stable mailing list, is there any
reason why it has not been integrated into those LTS branches ?

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com