linux-kernel - Re: OOPS (NULL pointer dereference) in v2.6.22-rc3

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Date:	Sat, 2 Jun 2007 16:45:15 +0200
From:	Alex Riesen <raa.lkml@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: OOPS (NULL pointer dereference) in v2.6.22-rc3

Andrew Morton, Sat, Jun 02, 2007 10:35:02 +0200:
> On Sat, 2 Jun 2007 00:15:15 +0200 Alex Riesen <raa.lkml@...il.com> wrote:
> 
> > Ubuntu 7.04, P4, SMT, hyperthreading active. Not reproducable, context unknown,
> > seen only two times :(
> > 
> > kernel: Call Trace:
> > kernel:  [show_trace_log_lvl+26/47] show_trace_log_lvl+0x1a/0x2f
> > kernel:  [show_stack_log_lvl+157/165] show_stack_log_lvl+0x9d/0xa5
> > kernel:  [show_registers+441/651] show_registers+0x1b9/0x28b
> > kernel:  [die+273/530] die+0x111/0x212
> > kernel:  [do_page_fault+1060/1266] do_page_fault+0x424/0x4f2
> > kernel:  [error_code+114/120] error_code+0x72/0x78
> > kernel:  [vfs_ioctl+562/581] vfs_ioctl+0x232/0x245
> > kernel:  [sys_ioctl+49/72] sys_ioctl+0x31/0x48
> > kernel:  [sysenter_past_esp+95/133] sysenter_past_esp+0x5f/0x85
> 
> I think we've seen a report of that before.  Do you recall what the system
> was doing at the time?
> 

Not really. One time it was when I started an old Opera browser I
discovered somewhere in my $HOME, the other is believe when I was
playing a scratched DVD with vlc (not sure, though).

> +		if (!filp->f_op->ioctl) {
> +			printk("%s: ioctl %p disappeared\n", __FUNCTION__, f);

Applied, but used KERN_EMERG (let's hope there will be no storm).

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