linux-kernel - cancel_work_sync() can cause priority invertion

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Date:   Wed, 27 Dec 2017 16:09:08 +0300
From:   Nikita Yushchenko <nikita.yoush@...entembedded.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: cancel_work_sync() can cause priority invertion

Hi

For those who care about linux RT behavior:

while analyzing traces, just found priority inversion caused by RT task
calling cancel_work_sync(), while work item in question is executing in
non-RT kworker that was preempted for significant time.

WBR,
Nikita Yushchenko