linux-kernel - Re: [patch] drivers/char/esp.c: fix bootup lockup

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Date:	Mon, 10 Mar 2008 00:04:36 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	Ingo Molnar <mingo@...e.hu>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [patch] drivers/char/esp.c: fix bootup lockup

On 03/09/2008 11:49 PM, Rafael J. Wysocki wrote:
> On Sunday, 9 of March 2008, Jiri Slaby wrote:
>> On 03/07/2008 11:08 AM, Ingo Molnar wrote:
>>> randconfig testing found a bootup lockup in drivers/char/esp.c - find 
>>> the fix below. Not sure why it became more prominent in 2.6.25-rc4, the 
>>> bug seems rather old and i've been doing allyesconfig bootups for ages 
>>> with CONFIG_ESP enabled.
>>>
>>> ------------->
>>> Subject: drivers/char/esp.c: fix bootup lockup
>>> From: Ingo Molnar <mingo@...e.hu>
>>> Date: Fri Mar 07 10:47:43 CET 2008
>>>
>>> fix this bootup lockup:
>>>
>>>  PM: Adding info for No Bus:ttyP63
>>>  ttyP32 at 0x0240 (irq = 0) is an ESP primary port
>>>  BUG: spinlock lockup on CPU#0, swapper/1, f56dd004
>>>  Pid: 1, comm: swapper Not tainted 2.6.25-rc4-sched-devel.git-x86-latest.git #402 [<c03ac6f4>] _raw_spin_lock+0x134/0x140
>>>   [<c08649be>] _spin_lock_irqsave+0x5e/0x80
>>>   [<c0b9fbfe>] ? espserial_init+0x2be/0x6e0
>>>   [<c0b9fbfe>] espserial_init+0x2be/0x6e0
>>>   [<c0b877a3>] kernel_init+0x83/0x260
>>>   [<c0b9f940>] ? espserial_init+0x0/0x6e0
>>>   [<c010416a>] ? restore_nocheck_notrace+0x0/0xe
>>>   [<c0b87720>] ? kernel_init+0x0/0x260
>>>   [<c0b87720>] ? kernel_init+0x0/0x260
>>>   [<c0104507>] kernel_thread_helper+0x7/0x10
>>>   =======================
>>>
>>> kzalloc() is not the way to initialize spinlocks anymore.
>> Good catch, thanks.
> 
> Is this a regression from 2.6.24?

I don't think so, the init code hasn't been touched for years...

regards,
--js
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