linux-kernel - Re: [Problem] kernel hangs at boot (bisected 892d208bcf)

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Message-ID: <CA+5PVA67g_2u6YkYtOMKwZOzmmkHs7FhYUASSOQbDozFvrzp-A@mail.gmail.com>
Date:	Thu, 19 Jan 2012 21:20:24 -0500
From:	Josh Boyer <jwboyer@...il.com>
To:	Dirk Gouders <gouders@...bocholt.fh-gelsenkirchen.de>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	linux-kernel@...r.kernel.org
Subject: Re: [Problem] kernel hangs at boot (bisected 892d208bcf)

On Thu, Jan 19, 2012 at 3:52 PM, Dirk Gouders
<gouders@...bocholt.fh-gelsenkirchen.de> wrote:
>> I did some more testing and it turns out that I have to revert a single
>> line of commit b66930052abf2 to make the kernel boot:
>>
>> diff --git a/mm/kmemleak.c b/mm/kmemleak.c
>> index c833add..d8bbb68 100644
>> --- a/mm/kmemleak.c
>> +++ b/mm/kmemleak.c
>> @@ -1710,6 +1710,7 @@ static void kmemleak_disable(void)
>>                 return;
>>
>>         /* stop any memory operation tracing */
>> +       atomic_set(&kmemleak_early_log, 0);
>>         atomic_set(&kmemleak_enabled, 0);
>>
>>         /* check whether it is too early for a kernel thread */
>>
>> I started that kernel with initcall_debug and attach the dmesg output.
>
> Hi Catlin,
>
> I want to note that in my config CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF is
> set which causes kmemleak_disable() to be called in kmemleak_init().

I also had CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF=y in my .config.  Disabling that
option allowed the machine to boot just fine.  Dirk seems to be onto something
here.

josh
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