linux-kernel - Re: 2.6.19-rc6 : Spontaneous reboots, stack overflows

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Date:	Sun, 26 Nov 2006 01:14:22 -0500
From:	Chuck Ebbert <76306.1226@...puserve.com>
To:	David Chinner <dgc@....com>
Cc:	"xfs-masters@....sgi.com" <xfs-masters@....sgi.com>,
	"xfs@....sgi.com" <xfs@....sgi.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Jesper Juhl <jesper.juhl@...il.com>
Subject: Re: 2.6.19-rc6 : Spontaneous reboots, stack overflows - seems
  to implicate xfs

In-Reply-To: <20061124005528.GF11034@...bourne.sgi.com>

On Fri, 24 Nov 2006 11:55:28 +1100, David Chinner wrote:

> Also, that means that while XFS is apparently only using <1500 bytes
> of stack through this path according to the static stack checker
> tool, there's more than 2k of extra stack usage that the tool is not
> telling me about. i.e. XFS and whatever is above/below it should
> have a full 4k to work with. I'd really like to know where that
> extra stack space is being used....

You could try applying the (untested) patch below and booting with
the parameter "kstack=2048", then regenerate the problem stack
traces. This should give you a complete raw stack dump in addition
to the call trace for each overflow.

(Output could get very large, so maybe adding a counter and stopping
after ~100 events might also be a good idea.)

--- 2.6.19-rc6-32smp.orig/arch/i386/kernel/irq.c
+++ 2.6.19-rc6-32smp/arch/i386/kernel/irq.c
@@ -80,7 +80,7 @@ fastcall unsigned int do_IRQ(struct pt_r
 		if (unlikely(esp < (sizeof(struct thread_info) + STACK_WARN))) {
 			printk("do_IRQ: stack overflow: %ld\n",
 				esp - sizeof(struct thread_info));
-			dump_stack();
+			show_stack();
 		}
 	}
 #endif
-- 
Chuck
"Even supernovas have their duller moments."
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