linux-kernel - Re: 2.6.23-rc2-mm1: sleeping function called from invalid context at kernel/mutex.c:86

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Date:	Fri, 10 Aug 2007 09:40:00 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mariusz Kozlowski <m.kozlowski@...land.pl>, josh@...edesktop.org,
	linux-kernel@...r.kernel.org, "Randy.Dunlap" <rdunlap@...otime.net>
Subject: Re: 2.6.23-rc2-mm1: sleeping function called from invalid context
	at kernel/mutex.c:86


* Andrew Morton <akpm@...ux-foundation.org> wrote:

> We seem to have made a mess in there.  timer_list_show() ends up 
> calling lookup_module_symbol_name(), which takes a mutex.  However 
> print_symbol() (which is called at oops time, interrupt time, etc) 
> calls module_address_lookup(), which is basically the same, only it 
> doesn't take the mutex.

hm, current upstream does:

 static void print_name_offset(struct seq_file *m, void *sym)
 {
         char symname[KSYM_NAME_LEN];

         if (lookup_symbol_name((unsigned long)sym, symname) < 0)

why was that changed? I think symbol lookups for debug purposes have to 
be lockless, fundamentally.

	Ingo
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