linux-kernel - Re: 2.6.36/2.6.37: broken compatibility with userspace input-utils ?

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Message-ID: <4D40E41D.2030003@teksavvy.com>
Date:	Wed, 26 Jan 2011 22:18:53 -0500
From:	Mark Lord <kernel@...savvy.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-input@...r.kernel.org, linux-media@...r.kernel.org
Subject: Re: 2.6.36/2.6.37: broken compatibility with userspace input-utils
 ?

On 11-01-26 09:12 PM, Dmitry Torokhov wrote:
> On Wed, Jan 26, 2011 at 08:07:29PM -0500, Mark Lord wrote:
>> On 11-01-26 08:01 PM, Mark Lord wrote:
>>> On 11-01-26 10:05 AM, Mark Lord wrote:
>>>> On 11-01-25 09:00 PM, Dmitry Torokhov wrote:
>>> ..
>>>>> I wonder if the patch below is all that is needed...
>>>>
>>>> Nope. Does not work here:
>>>>
>>>> $ lsinput
>>>> protocol version mismatch (expected 65536, got 65537)
>>>>
>>>
>>> Heh.. I just noticed something *new* in the bootlogs on my system:
>>>
>>> kernel: Registered IR keymap rc-rc5-tv
>>> udevd-event[6438]: run_program: '/usr/bin/ir-keytable' abnormal exit
>>> kernel: input: i2c IR (Hauppauge) as /devices/virtual/rc/rc0/input7
>>> kernel: ir-keytable[6439]: segfault at 8 ip 00000000004012d2 sp 00007fff6d43ca60
>>> error 4 in ir-keytable[400000+7000]
>>> kernel: rc0: i2c IR (Hauppauge) as /devices/virtual/rc/rc0
>>> kernel: ir-kbd-i2c: i2c IR (Hauppauge) detected at i2c-0/0-0018/ir0 [ivtv i2c
>>> driver #0]
>>>
>>> That's udev invoking ir-keyboard when the ir-kbd-i2c kernel module is loaded,
>>> and that is also ir-keyboard (userspace) segfaulting when run.
>>
>> Note: I tried to capture an strace of ir-keyboard segfaulting during boot
>> (as above), but doing so kills the system (hangs on boot).
>>
>> The command from udev was: /usr/bin/ir-keytable -a /etc/rc_maps.cfg -s rc0
> 
> Does it die when you try to invoke the command by hand? Can you see where?


No, it does not seem to segfault when I unload/reload ir-kbd-i2c
and then invoke it by hand with the same parameters.
Quite possibly the environment is different when udev invokes it,
and my strace attempt with udev killed the system, so no info there.

It does NOT segfault on the stock 2.6.37 kernel, without the patch.

-ml
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