linux-kernel - Re: [BUG] Linux 2.6.25-rc2 - Regression from 2.6.24-rc1-git1 softlockup while bootup on powerpc

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Message-Id: <20080221232418.b93db8d9.akpm@linux-foundation.org>
Date:	Thu, 21 Feb 2008 23:24:18 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linuxppc-dev@...abs.org, Ingo Molnar <mingo@...e.hu>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Andy Whitcroft <apw@...dowen.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>
Subject: Re: [BUG] Linux 2.6.25-rc2 - Regression from 2.6.24-rc1-git1 
 softlockup  while bootup on powerpc

On Tue, 19 Feb 2008 09:36:34 +0100 Jens Axboe <jens.axboe@...cle.com> wrote:

> But I think the radix 'scan over entire tree' is a bit fragile.

eek, it had better not be.  Was this an error in the caller?  Hope so.

> This
> patch adds a parallel hlist for ease of properly browsing the members,

Even though io_contexts are fairly uncommon, adding more stuff to a data
structure was a pretty sad alternative to fixing a bug in
radix_tree_gang_lookup(), or to fixing a bug in a caller of it.

IOW: what exactly went wrong here??
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