Linux-PowerEdge digest, Vol 2 #623 - 10 msgs

Clifford Perry cperry at
Thu Oct 23 07:42:01 CDT 2003

You can try upgrading the megaraid driver, and/or check /proc/interupts
and see if another device is sharing the same interrupts. A common cause
of this can be a busy server where the megaraid and eth devices are
sharing the same IRQ and sending requests of the same priority for
interrupt to the CPU, or you have a multi-cpu box (sorry dont know specs
of 2600's) and all the interrupts are going to the first cpu and not
being shared accross, a kernel upgrade/patch fixes that. 


> --__--__--
> Message: 10
> Date: Thu, 23 Oct 2003 08:07:54 +0100 (BST)
> From: Philip Rowlands <phr at>
> To: Linux-PowerEdge at
> Subject: Re: Kernel Message: ISR called reentrantly!!
> On Thu, 23 Oct 2003, Joe Stevens wrote:
> >Recently a couple of our more heavily loaded PE 2600s have started
> >getting the following error showing up in dmesg:
> >
> >ISR called reentrantly!!
> If I had to take an uneducated guess, I'd say that one of the driver
> functions is being interrupted and called again before a previous
> interrupt handler has finished working, hence "reentrantly!!"
> >The message appears to be comming from the megaraid.c driver.  The
> >machines in question appear to be functioning normally, but is this
> >something that I should be concerned about? (or is it something that can
> >be fixed with a patch somewhere?)
> Suggest you read the source code for the driver and work through what
> causes the error. From a quick skim, it doesn't appear to take any
> action other than printing the message, so it's probably harmless. As a
> side note, I now know why my syslog severities don't work on the kernel
> source - there's no severity argument to printk().
> Cheers,
> Phil
> --__--__--
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