linux-kernel - Re: 2.6.24-rc7-rt2

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Message-Id: <200801171857.11837.m.kozlowski@tuxland.pl>
Date:	Thu, 17 Jan 2008 18:57:10 +0100
From:	Mariusz Kozlowski <m.kozlowski@...land.pl>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	RT <linux-rt-users@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: 2.6.24-rc7-rt2

Hello,

> > > > I found this in dmesg:
> > > >
> > > > BUG: swapper:0 task might have lost a preemption check!
> > > > Pid: 0, comm: swapper Not tainted 2.6.24-rc7-rt2 #3
> > > >  [<c010386b>] show_trace_log_lvl+0x1d/0x3b
> > > >  [<c01042f3>] show_trace+0x12/0x14
> > > >  [<c0104a2f>] dump_stack+0x6a/0x70
> > > >  [<c0115419>] preempt_enable_no_resched+0x5c/0x5e
> > >
> > > This is really really strange. cpu_idle calls __preempt_enable_no_resched
> > > and not preempt_enable_no_resched (notice the prefixed underscores).
> > > So I don't know how you got that output. Did you get any strance rejects
> > > in applying this patch?
> >
> > Nope. Your rt patch applied cleanly to vanilla 2.6.24-rc7.
> >
> 
> OK, do you still get this message? Also I'm assuming this is x86, right?
> 
> Could you also do the following.
> 
> Go into your kernel build directory.
> Start up gdb (I'm hoping that you compiled with DEBUG_INFO)
>   gdb vmlinux
> (gdb) li *0xc0100e35
> 
> and show me what you get.

Oh crap. You are totaly right. I messed with quilt on that tree to bisect that thing
with LOCKDEP. A few patches from rt series were left unapplied somehow :/ Sorry for
the noise then.

Regards,

	Mariusz

BTW this is the gdb output which ofcourse is bogus.

(gdb) l*0xc0100e35
0xc0100e35 is in cpu_idle (arch/x86/kernel/process_32.c:203).
198                             __get_cpu_var(irq_stat).idle_timestamp = jiffies;
199                             idle();
200                     }
201                     tick_nohz_restart_sched_tick();
202                     preempt_enable_no_resched();
203                     schedule();
204                     preempt_disable();
205             }
206     }
207   
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