linux-kernel - Re: 2.6.23-rc1: BUG_ON in kmap_atomic

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Date:	Mon, 23 Jul 2007 23:01:52 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org
Subject: Re: 2.6.23-rc1: BUG_ON in kmap_atomic_prot()

On Mon, Jul 23, 2007 at 10:38:39PM +0400, Alexey Dobriyan wrote:
> Managed to hit BUG_ON() in kmap_atomic_prot() three times while doing
> nothing unusual for this box (two times it was under X, so I can't
> guarantee, one time while trying to reproduce via ./configure in gdb
> tarball)
> 
> Box has 2.5G of RAM. 2.6.22 was OK.
> 
> [dives into framebuffer console setup for complete oops]

kernel BUG at arch/i386/mm/highmem.c:38
PREEMPT DEBUG_PAGEALLOC SLAB
EIP at kmap_atomic_prot+0x32/0x93
	get_page_from_freelist
	__alloc_pages
	cache_alloc_refill
	cache_alloc_refill
	kmem_cache_alloc
	dst_alloc
	dst_alloc
	__ip_route_output_key
	[some junk I don't trust]

eax: 0000000c
ebx: 00000003
ecx: c065efe0
edx: 00000003
edi: 00000163


c010cc9b <kmap_atomic_prot>:
c010cc9b:	57                   	push   %edi
c010cc9c:	56                   	push   %esi
c010cc9d:	53                   	push   %ebx
c010cc9e:	89 c6                	mov    %eax,%esi
c010cca0:	89 d3                	mov    %edx,%ebx
c010cca2:	89 cf                	mov    %ecx,%edi
c010cca4:	b8 01 00 00 00       	mov    $0x1,%eax
c010cca9:	e8 dd 1b 00 00       	call   c010e88b <add_preempt_count>
c010ccae:	e8 b1 ac 0e 00       	call   c01f7964 <debug_smp_processor_id>
c010ccb3:	6b c0 0d             	imul   $0xd,%eax,%eax
c010ccb6:	8d 14 03             	lea    (%ebx,%eax,1),%edx
c010ccb9:	8d 04 95 00 00 00 00 	lea    0x0(,%edx,4),%eax
c010ccc0:	8b 0d 30 a1 3e c0    	mov    0xc03ea130,%ecx
c010ccc6:	29 c1                	sub    %eax,%ecx
c010ccc8:	83 39 00             	cmpl   $0x0,(%ecx)
c010cccb:	74 04                	je     c010ccd1 <kmap_atomic_prot+0x36>
c010cccd:	0f 0b                	ud2a   

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