linux-kernel - Re: BUG: Invalid wait context with 5.7-rc2?

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Message-ID: <20200423184955.c7yij2hg7a2ftsfa@linutronix.de>
Date:   Thu, 23 Apr 2020 20:49:55 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        lkml <linux-kernel@...r.kernel.org>,
        Will Deacon <will@...nel.org>
Subject: Re: BUG: Invalid wait context with 5.7-rc2?

On 2020-04-23 10:10:29 [-0700], Paul E. McKenney wrote:
> > Curious if this was already on anyone's radar?
> 
> Looks like __queue_work() is attempting to acquire a normal spinlock_t
> with interrupts disabled, which -rt doesn't like much.  And I believe
> that lockdep has been upgraded to check for this.
> 
> Adding Sebastian for his thoughts.

This is known. There is more than just workqueue in this regard. Please
disable CONFIG_PROVE_RAW_LOCK_NESTING until this is fixed (see Kconfig
help). Except for workqueue, there is also printk which triggers the
same warning and isn't as easy to fix as workqueue.

> 							Thanx, Paul

Sebastian