linux-kernel - Re: RT-Kernel boot stalls because of change in fs/dcache.c

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Date:   Wed, 19 Dec 2018 13:46:34 +0000
From:   Schrempf Frieder <frieder.schrempf@...tron.de>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rt-users@...r.kernel.org" <linux-rt-users@...r.kernel.org>
Subject: Re: RT-Kernel boot stalls because of change in fs/dcache.c

Hi Sebastian,

On 19.12.18 12:36, Sebastian Andrzej Siewior wrote:
> On 2018-12-19 07:50:17 [+0000], Schrempf Frieder wrote:
>> + linux-rt-users
>>
>> On 17.12.18 11:42, Frieder Schrempf wrote:
>>> Hi,
>>>
>>> I have tried to boot a 4.14-Kernel with the RT-patches and
>>> PREEMPT_RT_FULL on an i.MX6UL board. Unfortunately the boot stalls at
>>> some point and never finishes.
>>>
>>> I did some bisecting and found out, that reverting this change: [1],
>>> makes the board boot correctly.
>>>
>>> Can anyone help to come up with a proper fix for this?
> 
> can you check if the hashtable is initialized twice?

I'm not sure how to check, but I guess you are on the right track. I can 
leave the init loop for dentry_hashtable in place and remove the one for 
in_lookup_hashtable in vfs_caches_init_early() and this also makes the 
board boot.

Could it be, that the initializing for dentry_hashtable and 
in_lookup_hashtable somehow interfere?

Thanks for your help,
Frieder

> 
>>> Thanks,
>>> Frieder
>>>
>>> [1]:
>>> https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-stable-rt.git/commit/?h=v4.14-rt&id=56684d21f7f8341f7a5ed1433714112f49294590
> 
> Sebastian
>