Hi Pranay, This code logs the messages without problem if I don't stress it, so I suppose you can. If you want I will commit tomorrow my changes on github and I will send you the url to have a look. Cheers, Panos On May 2, 2012, at 10:31 PM, Pranay Kumar Srivastava wrote: > 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. > > ________________________________________ > From: kernelnewbies-bounces@xxxxxxxxxxxxxxxxx [kernelnewbies-bounces@xxxxxxxxxxxxxxxxx] On Behalf Of kernelnewbies-request@xxxxxxxxxxxxxxxxx [kernelnewbies-request@xxxxxxxxxxxxxxxxx] > Sent: Wednesday, May 02, 2012 9:30 PM > To: kernelnewbies@xxxxxxxxxxxxxxxxx > Subject: Kernelnewbies Digest, Vol 18, Issue 2 > > Send Kernelnewbies mailing list submissions to > kernelnewbies@xxxxxxxxxxxxxxxxx > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > or, via email, send a message with subject or body 'help' to > kernelnewbies-request@xxxxxxxxxxxxxxxxx > > You can reach the person managing the list at > kernelnewbies-owner@xxxxxxxxxxxxxxxxx > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Kernelnewbies digest..." > > > Today's Topics: > > 1. please report distros with CONFIG_DYNAMIC_DEBUG, using > ddebug_query= boot param (Jim Cromie) > 2. Re: immutable wiki? (michi1@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx) > 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.cromie@xxxxxxxxx> > Subject: please report distros with CONFIG_DYNAMIC_DEBUG, using > ddebug_query= boot param > To: kernelnewbies <kernelnewbies@xxxxxxxxxxxxxxxxx> > Message-ID: > <CAJfuBxw8aYimAU7kO42vh_e-zZBNSkw9Hd8Dx2tFCOWL4ueVgQ@xxxxxxxxxxxxxx> > 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: michi1@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx > Subject: Re: immutable wiki? > To: Bill Traynor <wmat@xxxxxxxxxxxxxx> > Cc: kernelnewbies@xxxxxxxxxxxxxxxxx > 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 <wmat@xxxxxxxxxxxxxx> > Subject: Re: immutable wiki? > To: michi1@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx > Cc: kernelnewbies@xxxxxxxxxxxxxxxxx > Message-ID: > <CAGfZjq69kO91rbiG8R5jTUmRDq3ZJRjp_oTLqS8wji1M=1NJ-Q@xxxxxxxxxxxxxx> > Content-Type: text/plain; charset=ISO-8859-1 > > On Wed, May 2, 2012 at 6:52 AM, > <michi1@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> 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.sakkos@xxxxxxx> > Subject: Crash when sending a lot of messages through a unix socket > To: "kernelnewbies@xxxxxxxxxxxxxxxxx" > <kernelnewbies@xxxxxxxxxxxxxxxxx> > Message-ID: > <A1F86B12A2E22C4CB3164ECFFD1C54DB08EC9407@xxxxxxxxxxxxxxxxx> > 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 > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20120502/271a5a4d/attachment-0001.html > > ------------------------------ > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > > End of Kernelnewbies Digest, Vol 18, Issue 2 > ******************************************** > > > > ::DISCLAIMER:: > ----------------------------------------------------------------------------------------------------------------------- > > The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only. > E-mail transmission cannot be guaranteed to be secure or error-free as information could be intercepted, corrupted, > lost, destroyed, arrive late or incomplete, or contain viruses.The e mail and its contents (with or without referred > errors) shall therefore not attach any liability on the originator or HCL or its affiliates. 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