linux-kernel - Re: [3.8-rc3 -> 3.8-rc4 regression] Re: [PATCH] module, async: async_synchronize

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Date:	Tue, 26 Nov 2013 14:30:10 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Josh Hunt <joshhunt00@...il.com>
Cc:	Tejun Heo <tj@...nel.org>, Jonathan Nieder <jrnieder@...il.com>,
	Ming Lei <ming.lei@...onical.com>,
	Alex Riesen <raa.lkml@...il.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Jens Axboe <axboe@...nel.dk>,
	USB list <linux-usb@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [3.8-rc3 -> 3.8-rc4 regression] Re: [PATCH] module, async:
 async_synchronize_full() on module init iff async is used

On Tue, Nov 26, 2013 at 2:12 PM, Josh Hunt <joshhunt00@...il.com> wrote:
>
> I should have clarified that I'm not using dm/md in my setup. I know
> the modules are getting loaded in the log I attached, but root is not
> a md/dm device.

Hmm. The initcall debugging doesn't actually show any of the "wait for
async events", because those debug messages come from
"do_one_initcall()", and the waiting happens later. Plus your messages
don't actually show where you are trying to - and failing - to mount
the root filesystem.

Without that kind of information, it's kind of hard to guess. Maybe
you could add a few printk's to your kernel? Add one to
do_init_module() *after* the

        if (current->flags & PF_USED_ASYNC)
                async_synchronize_full();

thing, and another to fs/namespace.c: do_mount() (just put something like

        printk("do_mount: %s at %s\n", dev_name, dir_name);

or whatever, so that we can see when that happens..

              Linus
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