[pre PATCH] freezes

From: Roger Larsson <roger.larsson@norran.net>
To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: [pre PATCH] freezes
Date: Thu, 15 Feb 2001 15:29:12 +0100	[thread overview]
Message-ID: <01021515291200.01148@dox> (raw)

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Hi,

I have had occasional freezes (complete NumLock won't work) for some time.
I blamed HW, irq conflicts, temperature problems, ...

But suddenly with 2.4.2-pre1 the problems disappeared!

Since 2.4.2-pre1 was rather short I took the time to try to find out what 
could be the fix.

I found one candidate, the setting of  TASK_RUNNING in handle_mm_fault.

Since the problem had appeared on both 2.4 and 2.2.18 I started to try to 
reproduce the problem in an unpatched 2.2 - it took some time, got the freeze
today.

During this time I have tried to collect information of the freezes on KDE 
mailing lists - I do now have three additional reports (one running 2.2.17)
Hardware has varied.

I have now compiled and installed this patch but since it can't be proven
to fix the problem I submit it now.

/RogerL

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Home page:
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--- linux/mm/memory.c.orig	Wed Feb 14 00:58:59 2001
+++ linux/mm/memory.c	Wed Feb 14 00:59:16 2001
@@ -935,6 +935,7 @@
 	pte_t * pte;
 	int ret;
 
+	current->state = TASK_RUNNING;
 	pgd = pgd_offset(vma->vm_mm, address);
 	pmd = pmd_alloc(pgd, address);
 	if (!pmd)
