linux-kernel - Re: crashing on lowmem-only config (was: kexec refuses to boot latest -mm)

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Date:	Mon, 07 Jan 2008 11:08:57 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
CC:	vgoyal@...hat.com, hbabu@...ibm.com,
	lkml <linux-kernel@...r.kernel.org>, kexec@...ts.infradead.org,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: crashing on lowmem-only config (was: kexec refuses to boot latest
 -mm)

Dhaval Giani wrote:
> 
> .config
> 

This appears to be unrelated, but booting this configuration on a stock 
2.6.24-rc7 kernel crashes during bootup with no initrd if the memory 
size is 896 MB or less (i.e. lowmem only):

Bad page state in process 'swapper'
page:c1b59800 flags:0xdead4aad mapping:00000000 mapcount:0 count:0
Trying to fix it up, but a reboot is needed
Backtrace:
Pid: 0, comm: swapper Not tainted 2.6.24-rc7 #1
  [<c0105ff3>] show_trace_log_lvl+0x1a/0x2f
  [<c0106885>] show_trace+0x12/0x14
  [<c0106b7b>] dump_stack+0x6c/0x72
  [<c015c5c3>] bad_page+0x67/0x93
  [<c015d33e>] __free_pages_ok+0x63/0x2f3
  [<c015d5f2>] __free_pages+0x24/0x26
  [<c05c70ea>] __free_pages_bootmem+0x5f/0x63
  [<c05c57c9>] free_all_bootmem_core+0xcd/0x1a4
  [<c05c58ad>] free_all_bootmem+0xd/0xf
  [<c05c244c>] mem_init+0x81/0x31b
  [<c05b4639>] start_kernel+0x2af/0x335
  [<00000000>] 0x0
  =======================
Bad page state in process 'swapper'
[...]
  =======================
BUG: spinlock lockup on CPU#0, swapper/0, 00000e28
Pid: 0, comm: swapper Tainted: G    B   2.6.24-rc7 #1
  [<c0105ff3>] show_trace_log_lvl+0x1a/0x2f
  [<c0106885>] show_trace+0x12/0x14
  [<c0106b7b>] dump_stack+0x6c/0x72
  [<c024b9a9>] _raw_spin_lock+0xc1/0xe2
  [<c0411d08>] _spin_lock+0x32/0x38
  [<c015d3f9>] __free_pages_ok+0x11e/0x2f3
  [<c015d5f2>] __free_pages+0x24/0x26
  [<c05c70ea>] __free_pages_bootmem+0x5f/0x63
  [<c05c57c9>] free_all_bootmem_core+0xcd/0x1a4
  [<c05c58ad>] free_all_bootmem+0xd/0xf
  [<c05c244c>] mem_init+0x81/0x31b
  [<c05b4639>] start_kernel+0x2af/0x335
  [<00000000>] 0x0
  =======================
[hang]

Booting with > 896 MB works...

	-hpa
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