Re: kernel hangs by many connections (reproducable)
On Mon, Sep 13, 2010 at 06:35:10AM +0200, Bret S. Lambert wrote: > On Mon, Sep 13, 2010 at 10:12:44AM +0600, Anton Maksimenkov wrote: > > 2010/9/13 Henning Brauer : > > >> hangs. 1-2 sec after start. > > >> --- interrupt --- > > >> pool_do_get(d0a10b60,0,0,0,60) at pool_do_get+0x2c2 > > >> pool_get(d0a10b60,0,8000,0,0) at pool_get+0x54 > > >> m_gethdr(1,1,8000,369e99,0) at m_gethdr+0x39 > > > too me that simply looks like you are running out of memory in mbpl > > > and the pool_get is a M_WAITOK one > > > > But it not unfreezed even after minute. SSH connections dropped, com > > console didn't response (but it can be dropped into ddb, of course). > > yes, because you've soaked up all the memory that's available for > handling incoming/outgoing network traffic; you've got a bunch of > processes that try to grab a limited number of resources, fail to > get all they need, and sleep while holding already-allocated mbufs, > meaning that nobody else can get them, and none of your processes > can advance. > > That said, the pool_get that's failing in the re driver is set as > non-blocking, so it should fail. However, it's hard to see how > you're tickling this without seeing the source that you're running, > since we don't know how you're cornholing the network stack. > Oh, that pool_get succeds since mbufs don't have a limit but the allocation of the cluster fails so the driver will reuse the old buffer on the queue. By breaking into ddb it just happend to be in there instead of somewhere else. When running with that many sockets a prominent warning about increasing kern.maxclusters shows up. This is not just dmesg spam, running out of mbuf clusters will stop your network stack. Most systems today come up with 6144 clusters. A TCP connection needs at least 4 clusters plus the network stack itself needs a few clusters for things like defragmenting long mbuf chains. So to be able to run with 1 sockets you should set kern.maxclusters to around 10. This will allow the network stack to allocate around 200MB of memory in kva. -- :wq Claudio
Re: kernel hangs by many connections (reproducable)
2010/9/13 Bret S. Lambert : > yes, because you've soaked up all the memory that's available for > handling incoming/outgoing network traffic; you've got a bunch of > processes that try to grab a limited number of resources, fail to > get all they need, and sleep while holding already-allocated mbufs, > meaning that nobody else can get them, and none of your processes > can advance. yes, I understand. but kernel must resolve this situation somehow. Isn't it? > That said, the pool_get that's failing in the re driver is set as > non-blocking, so it should fail. However, it's hard to see how > you're tickling this without seeing the source that you're running, > since we don't know how you're cornholing the network stack. oh, here is the source http://gist.github.com/576851 it is rather ugly, collected from pieces of another programs. my english is bad so I cut out my comments. I need the instrument to do a brief test of server under load. so this "penetrator" was planned as simply (yes, ugly but...) and quickly created instrument. -- antonvm
Re: linux emulation
On Mon, Sep 13, 2010 at 12:51:29AM -0400, Predrag Punosevac wrote: > Elmar Bschorer wrote: > >hi list, > > >i tried to get skype up and running with linux emulation on openbsd 4.7. > >skype starts up and i can log in but i can't see any contacts or chat > >with others. looks like i am not really connected. > >does anyone has skype running? any ideas what the problem might be? > > Of course. I got Skype running on OpenBSD > > http://www.daemonforums.org/showthread.php?t=2616&highlight=Skype+OpenBSD > >tia > >elmar > > The problem is that you can only use chat. You can NOT use VoIP since > OpenBSD does not have enough Linux emulation even for old Skype v 1.2 > compiled with static OSS(Linux version) let alone v. 2.xxx which > requires Alsa. > > > This is how we do VoIP on OpenBSD > > http://www.ryanflannery.net/howtos/obsd_voicechat.php pjsua and ekiga may fulfill your voip needs as well. they both have their issues though, imo. a truly usable, simple to configure voip client would be nice. > You can also get old Skype version 1.2 compiled with static OSS if you > look hard enough on the Internet and add the support to Linux emulator > layer if you have enough programming skill. I am sure Jake and Alexander > will give you their notes about aucat and tell you what needs to be > done. > > Cheers, > Predrag -- jake...@sdf.lonestar.org SDF Public Access UNIX System - http://sdf.lonestar.org
Re: linux emulation
Have you tried it under wine? http://wiki.winehq.org/OpenBSD On 12 September 2010 16:51, Predrag Punosevac wrote: > Elmar Bschorer wrote: >>hi list, > >>i tried to get skype up and running with linux emulation on openbsd 4.7. >>skype starts up and i can log in but i can't see any contacts or chat >>with others. looks like i am not really connected. >>does anyone has skype running? any ideas what the problem might be? > > Of course. I got Skype running on OpenBSD > > http://www.daemonforums.org/showthread.php?t=2616&highlight=Skype+OpenBSD >>tia >>elmar > > The problem is that you can only use chat. You can NOT use VoIP since > OpenBSD does not have enough Linux emulation even for old Skype v 1.2 > compiled with static OSS(Linux version) let alone v. 2.xxx which > requires Alsa. > > > This is how we do VoIP on OpenBSD > > http://www.ryanflannery.net/howtos/obsd_voicechat.php > > You can also get old Skype version 1.2 compiled with static OSS if you > look hard enough on the Internet and add the support to Linux emulator > layer if you have enough programming skill. I am sure Jake and Alexander > will give you their notes about aucat and tell you what needs to be > done. > > Cheers, > Predrag
Re: linux emulation
Elmar Bschorer wrote: >hi list, >i tried to get skype up and running with linux emulation on openbsd 4.7. >skype starts up and i can log in but i can't see any contacts or chat >with others. looks like i am not really connected. >does anyone has skype running? any ideas what the problem might be? Of course. I got Skype running on OpenBSD http://www.daemonforums.org/showthread.php?t=2616&highlight=Skype+OpenBSD >tia >elmar The problem is that you can only use chat. You can NOT use VoIP since OpenBSD does not have enough Linux emulation even for old Skype v 1.2 compiled with static OSS(Linux version) let alone v. 2.xxx which requires Alsa. This is how we do VoIP on OpenBSD http://www.ryanflannery.net/howtos/obsd_voicechat.php You can also get old Skype version 1.2 compiled with static OSS if you look hard enough on the Internet and add the support to Linux emulator layer if you have enough programming skill. I am sure Jake and Alexander will give you their notes about aucat and tell you what needs to be done. Cheers, Predrag
Re: kernel hangs by many connections (reproducable)
On Mon, Sep 13, 2010 at 10:12:44AM +0600, Anton Maksimenkov wrote: > 2010/9/13 Henning Brauer : > >> hangs. 1-2 sec after start. > >> --- interrupt --- > >> pool_do_get(d0a10b60,0,0,0,60) at pool_do_get+0x2c2 > >> pool_get(d0a10b60,0,8000,0,0) at pool_get+0x54 > >> m_gethdr(1,1,8000,369e99,0) at m_gethdr+0x39 > > too me that simply looks like you are running out of memory in mbpl > > and the pool_get is a M_WAITOK one > > But it not unfreezed even after minute. SSH connections dropped, com > console didn't response (but it can be dropped into ddb, of course). yes, because you've soaked up all the memory that's available for handling incoming/outgoing network traffic; you've got a bunch of processes that try to grab a limited number of resources, fail to get all they need, and sleep while holding already-allocated mbufs, meaning that nobody else can get them, and none of your processes can advance. That said, the pool_get that's failing in the re driver is set as non-blocking, so it should fail. However, it's hard to see how you're tickling this without seeing the source that you're running, since we don't know how you're cornholing the network stack. > -- > antonvm
Re: kernel hangs by many connections (reproducable)
2010/9/13 Henning Brauer : >> hangs. 1-2 sec after start. >> --- interrupt --- >> pool_do_get(d0a10b60,0,0,0,60) at pool_do_get+0x2c2 >> pool_get(d0a10b60,0,8000,0,0) at pool_get+0x54 >> m_gethdr(1,1,8000,369e99,0) at m_gethdr+0x39 > too me that simply looks like you are running out of memory in mbpl > and the pool_get is a M_WAITOK one But it not unfreezed even after minute. SSH connections dropped, com console didn't response (but it can be dropped into ddb, of course). -- antonvm
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cvsync problem: no update since 2010-09-09
It seems I don't get updates to the OpenBSD cvs tree anymore since
2010-09-09. Back then it ran fine:
Connecting to anoncvs3.usa.openbsd.org port
Connected to 192.43.244.161 port
Running...
Updating (collection openbsd/rcs)
Update CVSROOT/ChangeLog
Edit ports/cad/gerbv/Makefile,v
[[... many more file ...]]
Edit www/plus48.html,v
Edit www/translation.html,v
Done (collection openbsd/rcs)
Finished successfully
Since then I only get:
$ cvsync -c /home/ca/OpenBSD/etc/cvsync.conf -4 -v
Parsing a file /home/ca/OpenBSD/etc/cvsync.conf...
Connecting to anoncvs.usa.openbsd.org port
Connected to 149.20.54.217 port
Protocol: 0.24
Hash: MD5
Exchanging collection list...
collection name "openbsd" release "rcs" umask 002
Compression: zlib
Trying to establish the multiplexed channel...
Running...
Updating (collection openbsd/rcs)
Done (collection openbsd/rcs)
Finished successfully
Total time: 112.468 sec
I tried different servers:
config {
#hostname anoncvs3.usa.openbsd.org
hostname anoncvs.usa.openbsd.org
#hostname cvsync.csociety.org
compress
collection {
name openbsd release rcs
prefix /home/ca/OpenBSD/cvs
umask 002
}
}
but still no changes. For example, www/48.html is at 1.5 in my cvs
copy, but according to cvsweb it is at 1.9.
What am I doing wrong?
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Re: kernel hangs by many connections (reproducable)
* Anton Maksimenkov [2010-09-12 07:35]: > I use my OBSD machine to test some server on another machine. They are > connected by pathcord, 1Gbit network cards are used. > Test program (uses kqueue) do many (I want thousands) connections to > server. Write query, read answer. > And it tries to keep that much connections by doing as much new > connections as needed. > > When number of connections kept below 100 - all ok. But if I raise > them (upto about 500-1000) the program start these connections, do > some write/read (show about 10-20 successful reads) and the kernel > hangs. 1-2 sec after start. > Tweaks - kern.maxfiles=16384 and openfiles-cur/max=8192 for my user. > > Info from ddb (see dmesg below): > > ddb> show panic > the kernel did not panic > > ddb> trace > Debugger(0,3f8,0,0,1) at Debugger+0x4 > comintr(d1571000) at comintr+0x287 > Xrecurse_legacy4() at Xrecurse_legacy4+0xb3 > --- interrupt --- > pool_do_get(d0a10b60,0,0,0,60) at pool_do_get+0x2c2 > pool_get(d0a10b60,0,8000,0,0) at pool_get+0x54 > m_gethdr(1,1,8000,369e99,0) at m_gethdr+0x39 too me that simply looks like you are running out of memory in mbpl and the pool_get is a M_WAITOK one -- Henning Brauer, h...@bsws.de, henn...@openbsd.org BS Web Services, http://bsws.de Full-Service ISP - Secure Hosting, Mail and DNS Services Dedicated Servers, Rootservers, Application Hosting
Re: jconsole - no connection possible
On Sun, Sep 12, 2010 at 11:37:37AM +0200, Elmar Bschorer wrote: > hi list, > > when i try to connect to a jvm pid with jconsole for debugging i end > up with a "connection failed". > > i also tried connecting to a remote process ending up with the same > error. when i try to connect with jconsole to the same remote > process from a linux system it works. so it seems that jmx is > configured successfully on the remote side. > > are there any security related issues on 4.7 that prevent me from > establishing a connection with jconsole? > you do not give detailed description of your problem, anyway, it works ok here, check your network settings including /etc/hosts. > btw. what about the jdk17 package - is java emulated on obsd? > "You do not need Linux emulation to work with the native JDK."
Re: qemu core dumps
On Sun, Sep 12, 2010 at 04:28:25PM +0200, Elmar Bschorer wrote: > hi list, > > I tried to install ubuntu with qemu as neither jconsole nor skype > with emulation do work on openbsd 4.7 :-( You are using the wrong operating system for the job. Don't. There are plenty of Linux distros out there.
Re: pf.conf : rdr-to IF rather than IP
Have you even tested a dup-to configuration? Or are you just trying to run the code in your head? On Sun, Sep 12, 2010 at 04:29:14PM +0200, Jean-Francois wrote: > Hello, > > Well I am not sure dup-to is really suitable, I would like to redirect ports > to multiple ip as following example : > > match in on $ext_if proto tcp from any to any port 1050 rdr-to 192.168.1.10:50 > > Regards > > Le dimanche 29 ao?t 2010 15:15:28, Bret S. Lambert a ?crit : > > On Sun, Aug 29, 2010 at 02:05:40PM +0200, Jean-Francois wrote: > > > Hello, > > > > > > I would like to redirect particular ports on the sub-network, not only on > > > one ip adress of the subnetwork. > > > > > > Taking an example, I would like some software that listen to ports on > > > different machines with different ip adress without having to change the > > > pf.conf rules each time it is needed. > > > > So...you want traffic matching certain criteria duplicated to multiple > > IP addresses on your network? Did you try to search for "duplicate" > > in the pf.conf man page? > > > > I'm not sure what your ultimate goal is (or how you won't have to do > > something when "it is needed"), but, hey; whatever lifts your luggage. > > > > > Regards > > > > > > > If you can explain what you're actually trying to do, rather > > > > than talk about how you're thinking of accomplishing it, maybe > > > > someone can suggest a way. > > > > > > > > On 2010-08-28, Jean-Francois wrote: > > > > > Good evening, > > > > > > > > > > Is it possible to redirect to an IF or at least an IP range such as > > > > > following rules ? > > > > > > > > > > match in on $ext_if proto tcp from any to any port 1024:32768 \ > > > > > > > > > > rdr-to $int_if > > > > > > > > > > match in on $ext_if proto tcp from any to any port 1024:32768 \ > > > > > > > > > > rdr-to 192.168.100.0/16 > > > > > > > > > > I am not sure it even makes sense in regard of a redirection in a > > > > > network topology but I'll try the question, since it can help to > > > > > understand. > > > > > > > > > > I am thinking the probability is very high that a redirection of > > > > > above kind needs to copy as many times the packets as wide as the > > > > > range of ip is. > > > > > > > > > > Thanks to help me to understand this point. > > > > > > > > > > Jean-Frangois
qemu core dumps
hi list, I tried to install ubuntu with qemu as neither jconsole nor skype with emulation do work on openbsd 4.7 :-( while waiting for the ubuntu installer to finish, i got a core dump - ?!? # qemu -kernel-kqemu -m 1000 -boot d -cdrom /home/elmex/Downloads/ubuntu-10.04> qemu: fatal: triple fault EAX=c1c00144 EBX=f2f098c0 ECX=00d8 EDX= ESI=e1183300 EDI=c058f0b0 EBP=c1c0013c ESP=c1c00038 EIP=c058d051 EFL=0022 [---] CPL=0 II=0 A20=1 SMM=0 HLT=0 ES =007b 00cff300 CS =0060 00cf9a00 SS =0068 00cff300 DS =007b 00cff300 FS =00d8 013c1000 018f933c GS =00e0 c1c08640 0018 c14091c0 LDT= 8000 TR =0080 c1c06480 206b c10089c0 GDT= c1c0 00ff IDT= c0761000 07ff CR0=80050033 CR2=c0104020 CR3=319a CR4=06d0 CCS=0020 CCD=c1c00110 CCO=SUBL FCW=037f FSW=0033 [ST=0] FTW=00 MXCSR=1f80 FPR0=4000 FPR1=4000 FPR2=4000 FPR3=4000 FPR4=4000 FPR5=4000 FPR6=400fffc0 FPR7=80050f7003f4 XMM00=00ff XMM01=726f20676e6972747320656220747375 XMM02=7475616e755f776f6c6c612f72656c6c XMM03=6e73656f6420646574616369746e6568 XMM04=642f7974736978652074276e7365 XMM05=6361502e746e656e6f706d6f632e746e XMM06=6b63614279727473696765526567616b XMM07=7563723638785f78756e694c2f646e65 Abort trap (core dumped) greets elmar
Re: pf.conf : rdr-to IF rather than IP
Hello,
Well I am not sure dup-to is really suitable, I would like to redirect ports
to multiple ip as following example :
match in on $ext_if proto tcp from any to any port 1050 rdr-to
192.168.1.10:50
Regards
Le dimanche 29 ao{t 2010 15:15:28, Bret S. Lambert a icrit :
> On Sun, Aug 29, 2010 at 02:05:40PM +0200, Jean-Francois wrote:
> > Hello,
> >
> > I would like to redirect particular ports on the sub-network, not only on
> > one ip adress of the subnetwork.
> >
> > Taking an example, I would like some software that listen to ports on
> > different machines with different ip adress without having to change the
> > pf.conf rules each time it is needed.
>
> So...you want traffic matching certain criteria duplicated to multiple
> IP addresses on your network? Did you try to search for "duplicate"
> in the pf.conf man page?
>
> I'm not sure what your ultimate goal is (or how you won't have to do
> something when "it is needed"), but, hey; whatever lifts your luggage.
>
> > Regards
> >
> > > If you can explain what you're actually trying to do, rather
> > > than talk about how you're thinking of accomplishing it, maybe
> > > someone can suggest a way.
> > >
> > > On 2010-08-28, Jean-Francois wrote:
> > > > Good evening,
> > > >
> > > > Is it possible to redirect to an IF or at least an IP range such as
> > > > following rules ?
> > > >
> > > > match in on $ext_if proto tcp from any to any port 1024:32768 \
> > > >
> > > > rdr-to $int_if
> > > >
> > > > match in on $ext_if proto tcp from any to any port 1024:32768 \
> > > >
> > > > rdr-to 192.168.100.0/16
> > > >
> > > > I am not sure it even makes sense in regard of a redirection in a
> > > > network topology but I'll try the question, since it can help to
> > > > understand.
> > > >
> > > > I am thinking the probability is very high that a redirection of
> > > > above kind needs to copy as many times the packets as wide as the
> > > > range of ip is.
> > > >
> > > > Thanks to help me to understand this point.
> > > >
> > > > Jean-Frangois
Re: OpenBSD 4.6 + carp + pf + pfsync lockup
* Martin Pelikan [2010-09-09 12:24]: > It depends on what do you need. The defaults suffice for most cases, > but on our most loaded router we use tcp both 256k and udp send space which is bullshit on a router, since rcv/send space is for sockets and irrelevant for forwarded traffic - no sockets involved. -- Henning Brauer, h...@bsws.de, henn...@openbsd.org BS Web Services, http://bsws.de Full-Service ISP - Secure Hosting, Mail and DNS Services Dedicated Servers, Rootservers, Application Hosting
Bedvacanze.it - Il sito per organizzare le tue vacanze
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Samba security hole chain_reply
Hello, I am reading an article about Samba chain_reply vulnerability called CVE-2010-2063, where one can execute root shell on the server as far as I understand with all smb server up to 3.3.13 (excluded). One basic question, is this having the desired effect under OpenBSD as well or any mechanism of randomization makes the exploit leading to uncontrolled effects ? Regards
jconsole - no connection possible
hi list, when i try to connect to a jvm pid with jconsole for debugging i end up with a "connection failed". i also tried connecting to a remote process ending up with the same error. when i try to connect with jconsole to the same remote process from a linux system it works. so it seems that jmx is configured successfully on the remote side. are there any security related issues on 4.7 that prevent me from establishing a connection with jconsole? btw. what about the jdk17 package - is java emulated on obsd? tia elmar
linux emulation
hi list, i tried to get skype up and running with linux emulation on openbsd 4.7. skype starts up and i can log in but i can't see any contacts or chat with others. looks like i am not really connected. does anyone has skype running? any ideas what the problem might be? tia elmar
