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Date: Thu, 14 Feb 2013 18:28:26 +0100 (CET)
From: Thomas Gleixner <tglx@linutronix.de>
To: Ingo Molnar <mingo@kernel.org>
cc: Linus Torvalds <torvalds@linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Jens Axboe <axboe@kernel.dk>, Alexander Viro <viro@ftp.linux.org.uk>,
        "Theodore Ts'o" <tytso@mit.edu>, "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [-rc7 regression] Block IO/VFS/ext3/timer spinlock lockup?
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On Thu, 14 Feb 2013, Ingo Molnar wrote:
> * Ingo Molnar <mingo@kernel.org> wrote:
> 
> > > CPU0 appears to be idle:
> > > 
> > > [  118.510000] Call Trace:
> > > [  118.510000]  [<7900844b>] cpu_idle+0x86/0xb4
> > > [  118.510000]  [<792a91df>] rest_init+0x103/0x108
> > > [  118.510000]  [<794558cc>] start_kernel+0x2c7/0x2cc

Weird.
 
> > So, I've done a partial bisection, the breakage appears to have 
> > gone upstream between v3.8-rc3 and v3.8-rc4.
>
> these three:
> 
> 10d73e655cef mm: bootmem: fix free_all_bootmem_core() with odd bitmap alignment
> c060f943d092 mm: use aligned zone start for pfn_to_bitidx calculation
> c0232ae861df mm: memblock: fix wrong memmove size in memblock_merge_regions()
> 
> might have highmem=512m boot parameter sensitivity.

Is highmem=512 the boot parameter which makes it come and go ?

Thanks,

	tglx