linux-kernel - Re: recent -git: BUG in free_thread

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Message-Id: <1216857235.15519.189.camel@calx>
Date:	Wed, 23 Jul 2008 18:53:55 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Vegard Nossum <vegard.nossum@...il.com>
Cc:	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Jeff Garzik <jgarzik@...ox.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	netdev@...r.kernel.org, Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: recent -git: BUG in free_thread_xstate


On Thu, 2008-07-24 at 01:20 +0200, Vegard Nossum wrote:
> >> +extern void warn_on_slowpath(const char *file, int line);

Mmm, fun.

> >>  [<c013496f>] warn_on_slowpath+0x4f/0x70
> >>  [<c0198041>] ? check_bytes_and_report+0x21/0xc0
> >>  [<c04a8544>] ? __kfree_skb+0x34/0x80
> >>  [<c0198041>] ? check_bytes_and_report+0x21/0xc0
> >>  [<c01983ef>] ? check_object+0xdf/0x1f0
> >>  [<c0198041>] ? check_bytes_and_report+0x21/0xc0
> >>  [<c04a8544>] ? __kfree_skb+0x34/0x80
> >>  [<c01983ef>] ? check_object+0xdf/0x1f0
> >>  [<c04bbafc>] ? find_skb+0x3c/0x80
> >>  [<c04a9f7e>] skb_copy_and_csum_dev+0xee/0x100
> >>  [<c03539d7>] rtl8139_start_xmit+0x57/0x130
> >>  [<c019a84b>] ? __kmalloc_track_caller+0x8b/0x120
> >>  [<c04bba6e>] netpoll_send_skb+0x14e/0x1a0
> >>  [<c04bbf54>] netpoll_send_udp+0x1e4/0x210

Trying to warn_on from inside a network driver from inside netpoll may
cause trouble.

-- 
Mathematics is the supreme nostalgia of our time.

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