You mentioned your code is atomic. Are you certain that you can do a
sock_sendmsg from a non process context? I believe you can't do that from a non
process context cuz sock_sendmsg-->udp_sendmsg for DGRAM and i think that
assumes you are in process context.
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Sent: Wednesday, May 02, 2012 9:30 PM
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Subject: Kernelnewbies Digest, Vol 18, Issue 2
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Today's Topics:
1. please report distros with CONFIG_DYNAMIC_DEBUG, using
ddebug_query= boot param (Jim Cromie)
2. Re: immutable wiki? (mic...@michaelblizek.twilightparadox.com)
3. Re: immutable wiki? (Bill Traynor)
4. Crash when sending a lot of messages through a unix socket
(Panagiotis Sakkos)
----------------------------------------------------------------------
Message: 1
Date: Tue, 1 May 2012 12:36:04 -0600
From: Jim Cromie <jim.cro...@gmail.com>
Subject: please report distros with CONFIG_DYNAMIC_DEBUG, using
ddebug_query= boot param
To: kernelnewbies <kernelnewbies@kernelnewbies.org>
Message-ID:
<cajfubxw8ayimau7ko42vh_e-zzbnskw9hd8dx2tfcowl4ue...@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
hi all,
Ive been asked whether ddebug_query= boot param is used in any distros,
I think the question seeks to determine a good deprecation schedule for it
(its been obsoleted by dyndbg= in driver-core-next)
Would you all be so kind as to check your favorite distros, and report
the ones that
have one or both ?
Ubuntu 12.04 LTS lacks it:
jimc@chumly:~/projects/lx/linux-2.6$ grep DYNAMIC_DEBUG /boot/config*
/boot/config-3.0.0-17-generic:# CONFIG_DYNAMIC_DEBUG is not set
/boot/config-3.2.0-24-generic:# CONFIG_DYNAMIC_DEBUG is not set
Voyage linux also lacks it, (also debian based)
Fedora-16 has config option:
$ uname -a
Linux groucho.jimc.earth 3.3.2-6.fc16.x86_64 #1 SMP Sat Apr 21
12:43:20 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
$ grep DYNAMIC_DEBUG /boot/config-3.3.*
/boot/config-3.3.1-5.fc16.x86_64:CONFIG_DYNAMIC_DEBUG=y
/boot/config-3.3.2-1.fc16.x86_64:CONFIG_DYNAMIC_DEBUG=y
/boot/config-3.3.2-6.fc16.x86_64:CONFIG_DYNAMIC_DEBUG=y
but its not used by default. I have modified my grub defaults:
$ grep ddebug_query /etc/default/grub
GRUB_CMDLINE_LINUX='quiet rhgb loglevel=8 ddebug_query="module params
+p" dynamic_debug.verbose=1 nouveau.dyndbg nouveau.force_post=1
it87.dyndbg=+p nouveau.perflvl_wr=7777'
FYI, the above usage will eventually be unsupported,
it can be replaced in driver-core-next by either of:
dyndbg="module params +p"
params.dyndbg=+p
params.dyndbg # defaults to +p
the 2nd, 3rd forms also work for loadable modules (though params isnt
one of them)
thanks in advance
Jim
------------------------------
Message: 2
Date: Wed, 2 May 2012 12:52:38 +0200
From: mic...@michaelblizek.twilightparadox.com
Subject: Re: immutable wiki?
To: Bill Traynor <w...@alphatroop.com>
Cc: kernelnewbies@kernelnewbies.org
Message-ID: <20120502105237.GA2229@grml>
Content-Type: text/plain; charset=us-ascii
Hi!
On 09:29 Tue 01 May , Bill Traynor wrote:
> I have an Editor account for the kernelnewbies.org wiki, but all pages
> are currently immutable. Was the wiki made read-only at some point?
You must be on http://kernelnewbies.org/EditorsGroup to make changes. This
was made for spam procection. Everybody who is on the list can add you. What
is your username in the wiki?
-Michi
--
programing a layer 3+4 network protocol for mesh networks
see http://michaelblizek.twilightparadox.com
------------------------------
Message: 3
Date: Wed, 2 May 2012 08:06:36 -0400
From: Bill Traynor <w...@alphatroop.com>
Subject: Re: immutable wiki?
To: mic...@michaelblizek.twilightparadox.com
Cc: kernelnewbies@kernelnewbies.org
Message-ID:
<CAGfZjq69kO91rbiG8R5jTUmRDq3ZJRjp_oTLqS8wji1M=1n...@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
On Wed, May 2, 2012 at 6:52 AM,
<mic...@michaelblizek.twilightparadox.com> wrote:
> Hi!
>
> On 09:29 Tue 01 May ? ? , Bill Traynor wrote:
>> I have an Editor account for the kernelnewbies.org wiki, but all pages
>> are currently immutable. ?Was the wiki made read-only at some point?
>
> You must be on http://kernelnewbies.org/EditorsGroup to make changes. This
> was made for spam procection. Everybody who is on the list can add you. What
> is your username in the wiki?
Thanks Michael, Rik already fixed it for me.
>
> ? ? ? ?-Michi
> --
> programing a layer 3+4 network protocol for mesh networks
> see http://michaelblizek.twilightparadox.com
------------------------------
Message: 4
Date: Wed, 2 May 2012 13:43:41 +0000
From: Panagiotis Sakkos <panos.sak...@cern.ch>
Subject: Crash when sending a lot of messages through a unix socket
To: "kernelnewbies@kernelnewbies.org"
<kernelnewbies@kernelnewbies.org>
Message-ID:
<a1f86b12a2e22c4cb3164ecffd1c54db08ec9...@ploxchg03.cern.ch>
Keywords: CERN SpamKiller Note: -50
Content-Type: text/plain; charset="iso-8859-1"
Hi,
I am trying to log information from within the kernel with the use of a unix
socket (/dev/log).
My code is a kprobe handler, so while executing I am atomic and uninterrupted.
The crashes begin when I do stress tests against my module, so i.e. more than
50 logs per second.
The crash messages I get every time are different (from NULL reference, unable
to handle page request etc), so I suppose that something is overwritten and
this leads to the crash.
I don't want to post the code here because it ~100 LOC but these are my steps:
Initialization:
call sock_create_kern, with PF_UNIX, SOCK_DGRAM, 0 and the address of my
socket,
then I memset to 0 my sockaddr_un variable and then I set its sun_family
to PF_UNIX and copy the "/dev/log" string to sun_path
Logging:
I have the message that I want to log in variable called buffer and its
length in variable called message_length,
I set the msg_name of the msghdr to the address of my sockaddr_un variable,
than the msn_namelen to sizeof(sockadrr_un), the msg_iov to an iovec variable
which contains the buffer and the message_length values, msg_iovlen to 1 and
msg_control, msg_controllen to 0.
Then I set the fs to KERNEL_DS, call sock_sendmsg with parameters my
socket, the address of my msghdr and the message_length and then I restore the
fs that there was before setting it to KERNEL_DS.
Please note that my socket, sockadd_un and my buffer are static variables. Also
I always use the socket which is initialized once in the Initialization state
(function).
Do you see any "bad practice" or something that could lead to crashes when
stressing with a lot of messages the socket?
Thank you in advance!
Panos
--
http://www.cern.ch/psakkos
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