linux-kernel - Re: realtime-preempt patch-2.6.18-rt7 oops

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Date:	Mon, 6 Nov 2006 10:38:15 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Mike Galbraith <efault@....de>
Cc:	Rui Nuno Capela <rncbc@...bc.org>,
	Daniel Walker <dwalker@...sta.com>,
	linux-kernel@...r.kernel.org,
	Karsten Wiese <fzu@...gehoertderstaat.de>
Subject: Re: realtime-preempt patch-2.6.18-rt7 oops


* Mike Galbraith <efault@....de> wrote:

> I just reproduced it running glibc make check.  I had just enabled 
> kprobes and recompiled with the stock SuSE-10.1 compiler while waiting 
> for you to send me your .config (nevermind that request) so I could 
> try to reproduce it here.

hm, so kprobe_flush_task() is likely PREEMPT_RT-unsafe.

could you try the patch below, does it help? (a quick review seems to 
suggest that all codepaths protected by kretprobe_lock are atomic)

	Ingo

Index: linux/kernel/kprobes.c
===================================================================
--- linux.orig/kernel/kprobes.c
+++ linux/kernel/kprobes.c
@@ -50,7 +50,7 @@ static struct hlist_head kretprobe_inst_
 static atomic_t kprobe_count;
 
 DEFINE_MUTEX(kprobe_mutex);		/* Protects kprobe_table */
-DEFINE_SPINLOCK(kretprobe_lock);	/* Protects kretprobe_inst_table */
+DEFINE_RAW_SPINLOCK(kretprobe_lock);	/* Protects kretprobe_inst_table */
 static DEFINE_PER_CPU(struct kprobe *, kprobe_instance) = NULL;
 
 static struct notifier_block kprobe_page_fault_nb = {
-
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