linux-kernel - Re: WARNING: CPU: 1 PID: 14735 at fs/dcache.c:365 dentry

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Date:   Wed, 20 Jul 2022 03:00:23 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Helge Deller <deller@....de>
Cc:     John David Anglin <dave.anglin@...l.net>,
        Hillf Danton <hdanton@...a.com>, linux-kernel@...r.kernel.org,
        linux-parisc@...r.kernel.org
Subject: Re: WARNING: CPU: 1 PID: 14735 at fs/dcache.c:365
 dentry_free+0x100/0x128

On Tue, Jul 19, 2022 at 11:25:07PM +0200, Helge Deller wrote:
> On 7/19/22 22:59, John David Anglin wrote:
> > Hi Helge,
> >
> > I hit this warning with the patch below building ghc on mx3210:
> 
> As I wrote, I didn't faced it yet on my buildd server, but that could
> just have been luck...
> Hillf, should we try if this second hunk triggers?
> 
> --- a/fs/dcache.c
> +++ b/fs/dcache.c
> @@ -616,6 +618,7 @@ static void __dentry_kill(struct dentry
>  		dentry->d_flags |= DCACHE_MAY_FREE;
>  		can_free = false;
>  	}
> +	BUG_ON(!hlist_unhashed(&dentry->d_u.d_alias));
>  	spin_unlock(&dentry->d_lock);
>  	if (likely(can_free))
>  		dentry_free(dentry);

Would you gentlemen mind Cc'ing the entire thing to fsdevel?  Or at
least forwarding it my way...