linux-kernel - Re: [BUG v6.0-rc2] lockdep splat on ct_kernel

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Message-ID: <Y/9KjY48FoHIHJ44@kroah.com>
Date:   Wed, 1 Mar 2023 13:52:29 +0100
From:   "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
To:     Cheng-Jui Wang (王正睿) 
        <Cheng-Jui.Wang@...iatek.com>
Cc:     "peterz@...radead.org" <peterz@...radead.org>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "surenb@...gle.com" <surenb@...gle.com>,
        "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
        wsd_upstream <wsd_upstream@...iatek.com>,
        "paulmck@...nel.org" <paulmck@...nel.org>,
        Bobule Chang (張弘義) 
        <bobule.chang@...iatek.com>,
        "fweisbec@...il.com" <fweisbec@...il.com>
Subject: Re: [BUG v6.0-rc2] lockdep splat on ct_kernel_enter()

On Wed, Mar 01, 2023 at 12:37:29PM +0000, Cheng-Jui Wang (王正睿) wrote:
> On Mon, 2022-08-22 at 16:44 -0400, Steven Rostedt wrote:
> > My tests are failing because of this splat:
> > 
> > [   16.073659] ------------[ cut here ]------------
> > [   16.074407] bus: 'platform': add driver acpi-ged
> > [   16.074424] DEBUG_LOCKS_WARN_ON(lockdep_hardirqs_enabled())
> > [   16.074424] WARNING: CPU: 0 PID: 0 at
> > kernel/locking/lockdep.c:5506 check_flags+0x114/0x1d0
> 
> > [   16.074424]  lock_is_held_type+0x6f/0x130
> > [   16.186284]  rcu_read_lock_sched_held+0x4a/0x90
> > [   16.186284]  trace_rcu_dyntick+0x3a/0xe0
> > [   16.186284]  ct_kernel_enter.constprop.0+0x66/0xa0
> > [   16.186284]  ct_idle_exit+0xd/0x30
> > [   16.186284]  cpuidle_enter_state+0x28a/0x310
> > [   16.186284]  cpuidle_enter+0x2e/0x50
> > [   16.186284]  do_idle+0x1ec/0x280
> 
> Our test in v6.1 stable is failing due to this splat too. The v6.1
> stable kernel still has this splat.
> 
> This splat can be fixed by Peter's patch 
> https://lore.kernel.org/all/20220608144516.808451191@infradead.org/
> , but the fix is part of a big patchset 
> https://lore.kernel.org/all/20220608142723.103523089@infradead.org/
> introduced in 6.2.
> 
> Could the fixes be backported to v6.1 stable?

What "fixes" exactly are you referring to?  Can you provide a series of
git commit ids that cleanly apply or better yet, and series of patches
that you have backported and tested to ensure that they work properly?

thanks,

greg k-h