linux-kernel - Re: tg3 kernel bug in 2.6.18-mm3 and 2.6.19-rc2-mm2

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Message-Id: <20061021233610.f190e0a8.akpm@osdl.org>
Date:	Sat, 21 Oct 2006 23:36:10 -0700
From:	Andrew Morton <akpm@...l.org>
To:	David Miller <davem@...emloft.net>
Cc:	preining@...ic.at, linux-kernel@...r.kernel.org,
	Michael Chan <mchan@...adcom.com>, netdev@...r.kernel.org
Subject: Re: tg3 kernel bug in 2.6.18-mm3 and 2.6.19-rc2-mm2

On Sat, 21 Oct 2006 12:38:14 -0700 (PDT)
David Miller <davem@...emloft.net> wrote:

> From: Norbert Preining <preining@...ic.at>
> Date: Sat, 21 Oct 2006 15:22:39 +0200
> 
> >  [<c010469d>] dump_stack+0x12/0x14
> >  [<c0141cb3>] softlockup_tick+0xaa/0xc1
> >  [<c0129bad>] update_process_times+0x3b/0x5e
> >  [<c01362a1>] handle_update_profile+0x14/0x1e
> >  [<c0115956>] smp_apic_timer_interrupt+0x49/0x5b
> >  [<c0103998>] apic_timer_interrupt+0x28/0x30
> > DWARF2 unwinder stuck at apic_timer_interrupt+0x28/0x30
> > Leftover inexact backtrace:
> >  [<c01d03af>] delay_tsc+0xb/0x13
> >  [<c01d03e0>] __delay+0x6/0x7
> 
> It's OOPS'ing by softlockup'ing in udelay() and then we get a corrupt
> backtrace.

The unwinder-based backtrace is screwed up (yet again) but the old-style
backtrace is there, in all its messy glory.

Weeding out the crap, I think it's this:

 [<c01d03af>] delay_tsc+0xb/0x13
 [<c01d03e0>] __delay+0x6/0x7
 [<c022c240>] _tw32_flush+0x3f/0x51
 [<c022da97>] tg3_switch_clocks+0x8f/0x93

 <I assume tg3_init_hw() got inlined>

 [<c0237673>] tg3_open+0x250/0x520
 [<c02d3263>] dev_open+0x2b/0x62
 [<c02d1dd8>] dev_change_flags+0x47/0xe4
 [<c0307fcc>] devinet_ioctl+0x252/0x556
 [<c02d2e5a>] dev_ifsioc+0x113/0x38d
 [<c02d29c4>] dev_load+0x24/0x4b
 [<c02c9265>] sock_ioctl+0x19e/0x1c2

It's strange that the post-2.6.19-rc2 changes triggered this - that code
won't have run yet.

Norbert, are you really sure?
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