From: Matt Mackall <mpm@selenic.com>
To: Andrew Morton <akpm@osdl.org>
Cc: "Randy.Dunlap" <rddunlap@osdl.org>,
davej@redhat.com, linux-kernel@vger.kernel.org
Subject: Re: Debug: sleeping function called from invalid context
Date: Mon, 18 Aug 2003 23:14:04 -0500 [thread overview]
Message-ID: <20030819041404.GI16387@waste.org> (raw)
In-Reply-To: <20030818203513.393c4a48.akpm@osdl.org>
On Mon, Aug 18, 2003 at 08:35:13PM -0700, Andrew Morton wrote:
> "Randy.Dunlap" <rddunlap@osdl.org> wrote:
> >
> > Debug: sleeping function called with interrupts disabled at
> > include/asm/uaccess.h:473
>
> OK, now my vague understanding of what's going on is that the app has
> chosen to disable local interupts (via iopl()) and has taken a vm86 trap.
Are you suggesting that whatever's calling sys_vm86 has disabled
interrupts beforehand? I don't see why that's necessary at all. The
vm86 fault handler is called via do_general_protection in any case and
as such is in_interrupt() by definition. And a vm86 general protection
fault can be caused by any of cli, sti, pushf, popf, intx, or iret. In
fact, typical usage of vm86 mode is to setup a call to a 16-bit
software interrupt handler and return via fault on the iret.
I'm increasingly convinced it's actually broken.
--
Matt Mackall : http://www.selenic.com : of or relating to the moon
next prev parent reply other threads:[~2003-08-19 4:14 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-15 17:18 Debug: sleeping function called from invalid context Randy.Dunlap
2003-08-15 17:32 ` Dave Jones
2003-08-15 17:42 ` Randy.Dunlap
2003-08-15 19:30 ` Randy.Dunlap
2003-08-16 7:06 ` Matt Mackall
2003-08-18 21:07 ` Randy.Dunlap
2003-08-18 21:26 ` Matt Mackall
2003-08-19 0:13 ` Dave Jones
2003-08-19 0:15 ` Randy.Dunlap
2003-08-19 1:02 ` Zwane Mwaikambo
2003-08-19 0:15 ` Andrew Morton
2003-08-19 1:27 ` Matt Mackall
2003-08-19 3:24 ` Randy.Dunlap
2003-08-19 3:35 ` Andrew Morton
2003-08-19 3:39 ` Randy.Dunlap
2003-08-19 4:26 ` Matt Mackall
2003-08-19 4:29 ` Andrew Morton
2003-08-19 4:14 ` Matt Mackall [this message]
2003-08-19 5:14 ` Matt Mackall
2003-08-19 1:01 ` Matt Mackall
2003-08-19 1:04 ` Dave Jones
2003-08-19 1:09 ` Matt Mackall
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