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From: Christoph Rohland <cr@sap.com>
To: vda@port.imtp.ilyichevsk.odessa.ua
Cc: Geoffrey Gallaway <geoffeg@sin.sloth.org>, linux-kernel@vger.kernel.org
Subject: Re: Update - Ramdisks and tmpfs problems
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	<20020410102343.A31552@sin.sloth.org>
	<200204110600.g3B60UX08856@Port.imtp.ilyichevsk.odessa.ua>
Organisation: SAP LinuxLab
Date: Thu, 11 Apr 2002 17:47:01 +0200
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Hi Denis,

On Thu, 11 Apr 2002, Denis Vlasenko wrote:
>> I am using a Dual Intel PIII 1Ghz box. When I use a SMP kernel AND
>> do multiple tmpfs mounts (mount --bind /dev/shm/etc /etc; mount
>> --bind /dev/shm/var /var) the machine goes into a reset
>> loop. HOWEVER, when I use a non-SMP kernel and still do multiple
>> tmpfs mounts OR when I use a SMP kernel and do only one tmpfs
>> mount, the machine boots fine. Every once in a while (1 out of 20
>> times?) the machine would boot fine with a SMP kernel and multiple
>> tmpfs mounts. Is this a timing issue?
> 
> Yes, sounds like race. It seems locking isn't quite right in tmpfs.

I am not sure. Could also be bad ram which only triggers under higher
load. I never had instant reboots on my machines due to races, but
only when I had bad DIMMs.

I also have multiple tmpfs instances on my 8-way test box where I
developed and tested tmpfs.

But you could be right. Unfortunately I do not have the time to
investigate further.

Greetings
		Christoph


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