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From: Arnd Bergmann <arnd@arndb.de>
To: Adrian Bunk <bunk@stusta.de>
Cc: linux-kernel@vger.kernel.org, linux-msdos@vger.kernel.org,
	Arjan van de Ven <arjan@infradead.org>,
	Ingo Molnar <mingo@elte.hu>
Subject: Re: 2.6.12-rc1 breaks dosemu
Date: Fri, 25 Mar 2005 19:52:31 +0100	[thread overview]
Message-ID: <200503251952.33558.arnd@arndb.de> (raw)
In-Reply-To: <20050320021141.GA4449@stusta.de>

On Sünndag 20 März 2005 03:11, Adrian Bunk wrote:
> xdosemu 1.2.2 runs fine under 2.6.11.5, but fails under 2.6.12-rc1 with 
> the following error:
> 
> <--  snip  -->
> 
> $ xdosemu 
> ERROR: cpu exception in dosemu code outside of VM86()!
> trapno: 0x0e  errorcode: 0x00000005  cr2: 0xffffff8e
> eip: 0x000069ee  esp: 0xbfdbffcc  eflags: 0x00010246
> cs: 0x0073  ds: 0x007b  es: 0x007b  ss: 0x007b
> Page fault: read instruction to linear address: 0xffffff8e
> CPU was in user mode
> Exception was caused by insufficient privilege

I had the same problem and found out that disabling
address space randomization (echo 0 > 
/proc/sys/kernel/randomize_va_space) solves this
reliably. With randomization enabled, I can start up
dosemu maybe 1 out of 100 times.

I guess the randomization patches changed the mapping
in a way that dosemu did not expect.

 Arnd <><
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WARNING: multiple messages have this Message-ID (diff)
From: Arnd Bergmann <arnd@arndb.de>
To: Adrian Bunk <bunk@stusta.de>
Cc: linux-kernel@vger.kernel.org, linux-msdos@vger.kernel.org,
	Arjan van de Ven <arjan@infradead.org>,
	Ingo Molnar <mingo@elte.hu>
Subject: Re: 2.6.12-rc1 breaks dosemu
Date: Fri, 25 Mar 2005 19:52:31 +0100	[thread overview]
Message-ID: <200503251952.33558.arnd@arndb.de> (raw)
In-Reply-To: <20050320021141.GA4449@stusta.de>

On Sünndag 20 März 2005 03:11, Adrian Bunk wrote:
> xdosemu 1.2.2 runs fine under 2.6.11.5, but fails under 2.6.12-rc1 with 
> the following error:
> 
> <--  snip  -->
> 
> $ xdosemu 
> ERROR: cpu exception in dosemu code outside of VM86()!
> trapno: 0x0e  errorcode: 0x00000005  cr2: 0xffffff8e
> eip: 0x000069ee  esp: 0xbfdbffcc  eflags: 0x00010246
> cs: 0x0073  ds: 0x007b  es: 0x007b  ss: 0x007b
> Page fault: read instruction to linear address: 0xffffff8e
> CPU was in user mode
> Exception was caused by insufficient privilege

I had the same problem and found out that disabling
address space randomization (echo 0 > 
/proc/sys/kernel/randomize_va_space) solves this
reliably. With randomization enabled, I can start up
dosemu maybe 1 out of 100 times.

I guess the randomization patches changed the mapping
in a way that dosemu did not expect.

 Arnd <><

  parent reply	other threads:[~2005-03-25 18:52 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-03-20  2:11 2.6.12-rc1 breaks dosemu Adrian Bunk
2005-03-20  3:04 ` Gene Heskett
2005-03-25 18:52 ` Arnd Bergmann [this message]
2005-03-25 18:52   ` Arnd Bergmann
2005-03-25 19:14   ` Arjan van de Ven
2005-03-25 22:54     ` Arnd Bergmann
2005-03-25 22:54       ` Arnd Bergmann
2005-03-26  8:10       ` Arjan van de Ven
2005-03-26  8:10         ` Arjan van de Ven
2005-03-26  8:18         ` Bart Oldeman
2005-03-26  8:18           ` Bart Oldeman
2005-03-26 13:49           ` Arnd Bergmann
2005-03-26 13:49             ` Arnd Bergmann
2005-03-26 14:28             ` Arjan van de Ven
2005-03-26 14:28               ` Arjan van de Ven
2005-03-26 14:35               ` Arjan van de Ven
2005-03-26 14:35                 ` Arjan van de Ven
2005-03-26  8:25       ` Arjan van de Ven
2005-03-26  8:25         ` Arjan van de Ven
2005-03-26  8:32         ` Bart Oldeman
2005-03-26  9:28           ` Arjan van de Ven
2005-03-31  6:43             ` Bart Oldeman

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