linux-kernel - Re: "BUG: scheduling while atomic: pdflush/30/0x00000002" in latest git

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Date:	Fri, 9 Jan 2009 13:18:14 +0800
From:	Grissiom <chaos.proton@...il.com>
To:	"Dave Kleikamp" <shaggy@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org,
	"Arjan van de Ven" <arjan@...radead.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: "BUG: scheduling while atomic: pdflush/30/0x00000002" in latest git

On Thu, Jan 8, 2009 at 22:37, Dave Kleikamp <shaggy@...ux.vnet.ibm.com> wrote:
>
> The offender is
> http://git.kernel.org/gitweb.cgi?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=efaee192
>
> async_synchronize_full_special() shouldn't be called while holding a
> spinlock, sb_lock.
>
> I think this patch should fix it.  Arjan, would this work?
>
> Signed-off-by: Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
>
> diff --git a/fs/super.c b/fs/super.c
> index cb20744..7d67387 100644
> --- a/fs/super.c
> +++ b/fs/super.c
> @@ -458,7 +458,6 @@ void sync_filesystems(int wait)
>                if (sb->s_flags & MS_RDONLY)
>                        continue;
>                sb->s_need_sync_fs = 1;
> -               async_synchronize_full_special(&sb->s_async_list);
>        }
>
>  restart:
> @@ -471,6 +470,7 @@ restart:
>                sb->s_count++;
>                spin_unlock(&sb_lock);
>                down_read(&sb->s_umount);
> +               async_synchronize_full_special(&sb->s_async_list);
>                if (sb->s_root && (wait || sb->s_dirt))
>                        sb->s_op->sync_fs(sb, wait);
>                up_read(&sb->s_umount);
>
> --
> David Kleikamp
> IBM Linux Technology Center
>
>

Problem gone with this patch applied. Thanks for the fixing.

-- 
Cheers,
Grissiom
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