From: Philippe Elie <phil.el@wanadoo.fr>
To: Zwane Mwaikambo <zwane@holomorphy.com>
Cc: Russell King <rmk@arm.linux.org.uk>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: 2.5.45 odd deref in serial_in
Date: Wed, 06 Nov 2002 03:23:13 +0000 [thread overview]
Message-ID: <3DC88B21.3030202@wanadoo.fr> (raw)
In-Reply-To: Pine.LNX.4.44.0211050927350.27141-100000@montezuma.mastecende.com
Zwane Mwaikambo wrote:
> On Tue, 5 Nov 2002, Russell King wrote:
>
>
>>static _INLINE_ unsigned int serial_in(struct uart_8250_port *up, int offset)
>>{
>> offset <<= up->port.regshift;
>>
>> switch (up->port.iotype) {
>>
>>which also dereferences "up". So something may have corrupted %ebx
>>between executing that switch statement and executing the inb().
>>
>>Could the NMI handler be corrupting %ebx ?
ok but
> [<c023d9d8>] serial8250_console_write+0x68/0x1f0
> [<c0121459>] __call_console_drivers+0x49/0x50
> [<c0121541>] call_console_drivers+0x71/0x100
> [<c012196d>] release_console_sem+0xbd/0x170
> [<c01217cc>] printk+0x18c/0x220
> [<c01170d5>] nmi_add_task+0xc5/0xe0
> [<c01177e0>] nmi_watchdog_tick+0x0/0x120
the oops occur during a NMI so I wonder how a NMI
can occur and clobber ebx
--
Philippe Elie
next prev parent reply other threads:[~2002-11-06 2:15 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-11-05 4:27 2.5.45 odd deref in serial_in Zwane Mwaikambo
2002-11-05 4:38 ` Zwane Mwaikambo
2002-11-05 9:02 ` Russell King
2002-11-05 9:20 ` Zwane Mwaikambo
2002-11-05 10:16 ` Russell King
2002-11-07 15:17 ` David Woodhouse
2002-11-07 15:24 ` Zwane Mwaikambo
2002-11-05 10:20 ` Russell King
2002-11-05 14:30 ` Zwane Mwaikambo
2002-11-06 3:23 ` Philippe Elie [this message]
2002-11-06 8:37 ` Zwane Mwaikambo
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