linux-kernel - Re: OOPS: 2.6.24-rc5-mm1 -- EIP is at r_show+0x2a/0x70 -- (triggered by "cat /proc/iomem")

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Date:	Thu, 20 Dec 2007 13:53:54 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Miles Lane <miles.lane@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	David Howells <dhowells@...hat.com>
Subject: Re: OOPS: 2.6.24-rc5-mm1 -- EIP is at r_show+0x2a/0x70  -- (triggered by "cat /proc/iomem")

> > > Okay.  The command that directly triggers this is:       cat /proc/iomem

> > > [  252.868386] BUG: unable to handle kernel NULL pointer dereference at virtual address 00000018

> > > [  252.868481] EIP is at r_show+0x2a/0x70
> > > [  252.868483] EAX: 00000000 EBX: 00000001 ECX: c07e3224 EDX: c04bb034
> > > [  252.868486] ESI: 00000008 EDI: ed1f52c0 EBP: f5320f10 ESP: f5320f04
> > > [  252.868489]  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
> > > [  252.868493] Process head (pid: 7088, ti=f5320000 task=f532e000 task.ti=f5320000)

> > > [  252.868552]  [<c0199a7e>] seq_read+0x19a/0x26c
> > > [  252.868557]  [<c01af4f5>] proc_reg_read+0x60/0x74
> > > [  252.868562]  [<c018390d>] vfs_read+0xa2/0x11e
> > > [  252.868567]  [<c0183d02>] sys_read+0x3b/0x60
> > > [  252.868571]  [<c0106bae>] sysenter_past_esp+0x6b/0xc1
> > > [  252.868575]  =======================
> > > [  252.868577] Code: c3 55 89 d1 89 e5 57 89 c7 56 53 8b 50 64 83 7a 
> > > 0c 00 77 0e 81 7a 08 ff ff 00 00 be 04 00 00 00 76 05 be 08 00 00 00 
> > > 89 c8 31 db <8b> 40 18 39 d0 74 06 43 83 fb 05 75 f3 8b 41 10 ba 2f 1b 
> > > 45 c0
> > > [  252.868623] EIP: [<c012d527>] r_show+0x2a/0x70 SS:ESP 0068:f5320f04
> > >
> > >
> 
> I would be suspecting iget-stop-procfs-from-using-iget-and-read_inode.patch.

Something is screwed in resources tree?
Miles, you have CONFIG_RESOURCES_64BIT=y, right?

<r_show>:
	55			push	%ebp
	89 d1			mov	%edx,%ecx
	89 e5			mov	%esp,%ebp
	57			push	%edi
	89 c7			mov	%eax,%edi
	56			push	%esi
	53			push	%ebx
	8b 50 64		mov	0x64(%eax),%edx
	83 7a 0c 00		cmpl	$0x0,0xc(%edx)
	77 0e			ja	1f
	81 7a 08 ff ff 00 00	cmpl	$0000ffff,0x8(%edx)
	be 04 00 00 00		mov	$0x4,%esi		# width	= 4
	76 05			jbe	2f
1:	be 08 00 00 00		mov	$0x8,%esi		# width	= 8
2:	89 c8			mov	%ecx,%eax		# %eax = p
	31 db			xor	%ebx,%ebx		# depth	= 0
4:===>	<8b> 40 18		mov	0x18(%eax),%eax		# p = p->parent
	39 d0			cmp	%edx,%eax		# if (p->parent == root)
	74 06			je	3f
	43			inc	%ebx			depth++
	83 fb 05		cmp	$0x5,%ebx		depth <	MAX_IORES_LEVEL
	75 f3			jne	4b
3:	8b 41 10		mov	0x10(%ecx),%eax
	ba 2f 1b 45 c0		mov	$c0451b2f,%edx
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