Hi On Wed, May 16, 2007 at 02:55:42PM +0200, Bastian Venthur wrote: > Am 16.05.2007 14:31 schrieb Ola Lundqvist: > > >>> When did this problem occur? > >> It happens seldom on normal traffic but quite reproducible on several > >> machines when downloading large files. It happens not on every attempt, > >> but often enough to quickly reproduce it. > > > > Do it happen if you send large packets over something else than pptp? > > I'm currently trying hard to reproduce this bug without pptp, so far > without success. It seems it only happens over pptp.
Ok. In that case I suspect one of the modules ppp_* (you listed them below). > I'll let you know ASAP when it happens without pptp, since this would > obviously close this bug. > > >>> What kernel version do you use? > >>>> Architecture: amd64 > >>>> Kernel: Linux 2.6.18-4-amd64 > >> It is the current amd64 kernel from Etch. > > > > Ok. One more question, is it using multiple CPU:s or something similar? > > Yes, /proc/cpuinfo shows two Intel Core 2 CPUs (T7200 @ 2.00GHz). Ok. > >>> What kernel modules do you have loaded? > >> The output of lsmod is attached. > > > > In the attached files I could not find any ppp module. I thought you > > needed that for it to work. The only module related to network traffic > > I found was e1000... Or is the ppdev the ppp module maybe? > > Sorry my bad, I accidentally lsmod'ed while disconnected from pptp. I've > attached another lsmod made during a pptp session. This time ppp_mppe, > ppp_async and ppp_generic are loaded as they always are when starting a > pptp session. I see. I suspect that the problem is in one of those three modules. > > Unfortunatly I do not think you can get any help from strace, or even > > gdb. What you could use is the following: > > * A tcpdump (on an external machine) to see exactly what traffic that > > passes over the network just before the machine freezes. > > * Some kind of kernel debug tool. > > I see what I can do, unfortunately I'm not very fit on kernel debugging > or network sniffing. I could run a network sniffer on the router between > the laptop and the internet if you could give me some basic jump start > (which tool, which options, etc). There are a couple of things to do: * Do not run in graphic mode. Instead run in text mode, because the kernel may print information there. * In order to sniff the traffic you need the following: - An extra Linux PC with tcpdump installed (or the firewall if you can install tcpdump there). - Access to the traffic. This means that you should use a hub (not a switch) or a switch where you can redirect all traffic to a certain port. If you have the possibility to install tcpdump on the remote side of the laptop then that will of course have access to the traffic as well. - On the server run tcpdump -n -i ethX I think that is enough. You will see all traffic sent back and forth. See man tcpdump for more information about options, disc logging etc. * I'm not that used to kernel debugging myself either but your syslog may contain information, or the console if you do not run graphics mode. > > When the computer freezes. Do it totally freeze without any console > > output or how do it behave? > > It freezes totally. The screen stays on (shows no errors or something, > it's just frozen), the keyboard or mouse does not react. The only thing > you can do is pressing the power button several seconds to shut down the > machine the hard way. I see. Please try to be in console mode when you reproduce problem as the kernel may print things to the console just before it crashes. Regards, // Ola > > Cheers, > > Bastian > > -- > Bastian Venthur http://venthur.de > Debian Developer venthur at debian org > > Module Size Used by > arc4 6528 2 > ppp_mppe 11528 2 > ppp_async 16640 1 > ppp_generic 33952 6 ppp_mppe,ppp_async > slhc 11392 1 ppp_generic > rfcomm 47912 0 > l2cap 32512 5 rfcomm > bluetooth 61572 4 rfcomm,l2cap > nfs 236216 0 > nfsd 256200 17 > exportfs 10368 1 nfsd > lockd 67600 3 nfs,nfsd > nfs_acl 8320 2 nfs,nfsd > sunrpc 166984 13 nfs,nfsd,lockd,nfs_acl > ppdev 14088 0 > parport_pc 41640 0 > lp 17736 0 > parport 44684 3 ppdev,parport_pc,lp > button 12192 0 > ac 10376 0 > battery 15496 0 > autofs4 27912 0 > ipv6 285664 22 > deflate 8576 0 > zlib_deflate 24216 1 deflate > twofish 47744 0 > serpent 23168 0 > aes 31040 0 > blowfish 13312 0 > des 21248 0 > sha256 13312 0 > sha1 7296 2 > crypto_null 7296 0 > af_key 43540 2 > dm_snapshot 20664 0 > dm_mirror 25216 0 > dm_mod 62800 2 dm_snapshot,dm_mirror > fuse 48944 0 > speedstep_centrino 12448 2 > freq_table 9728 1 speedstep_centrino > cpufreq_ondemand 11920 0 > ibm_acpi 32928 0 > fglrx 463604 8 > loop 20112 0 > tsdev 13056 0 > joydev 15360 0 > irtty_sir 13440 0 > sir_dev 22152 1 irtty_sir > snd_hda_intel 23708 0 > snd_hda_codec 184192 1 snd_hda_intel > snd_pcm_oss 48672 0 > snd_pcm 89096 3 snd_hda_intel,snd_hda_codec,snd_pcm_oss > snd_mixer_oss 21888 1 snd_pcm_oss > snd_seq_dummy 8580 0 > snd_seq_oss 37248 0 > snd_seq_midi 13632 0 > snd_rawmidi 31392 1 snd_seq_midi > snd_seq_midi_event 12544 2 snd_seq_oss,snd_seq_midi > snd_seq 59520 6 > snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event > snd_timer 29192 2 snd_pcm,snd_seq > snd_seq_device 13204 5 > snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi,snd_seq > nsc_ircc 28752 0 > snd 65256 10 > snd_hda_intel,snd_hda_codec,snd_pcm_oss,snd_pcm,snd_mixer_oss,snd_seq_oss,snd_rawmidi,snd_seq,snd_timer,snd_seq_device > ipw3945 205348 1 > soundcore 15392 1 snd > pcmcia 43672 0 > irda 199660 3 irtty_sir,sir_dev,nsc_ircc > i2c_i801 13076 0 > psmouse 44432 0 > snd_page_alloc 14864 2 snd_hda_intel,snd_pcm > crc_ccitt 6784 2 ppp_async,irda > i2c_core 27776 1 i2c_i801 > serio_raw 12036 0 > pcspkr 7808 0 > yenta_socket 31884 1 > rsrc_nonstatic 16384 1 yenta_socket > pcmcia_core 47012 3 pcmcia,yenta_socket,rsrc_nonstatic > evdev 15360 2 > ieee80211 36680 1 ipw3945 > ieee80211_crypt 11264 1 ieee80211 > firmware_class 15616 2 ipw3945,pcmcia > intel_agp 29248 1 > ext3 138512 2 > jbd 65392 1 ext3 > mbcache 14216 1 ext3 > ide_cd 45088 0 > cdrom 40488 1 ide_cd > sd_mod 25856 4 > piix 15492 0 [permanent] > ahci 24708 3 > libata 106784 1 ahci > scsi_mod 153008 3 sd_mod,ahci,libata > ehci_hcd 36104 0 > generic 11396 0 [permanent] > ide_core 147584 3 ide_cd,piix,generic > uhci_hcd 28696 0 > e1000 123968 0 > thermal 20240 0 > processor 38248 2 speedstep_centrino,thermal > fan 9864 0 -- --- Ola Lundqvist systemkonsult --- M Sc in IT Engineering ---- / [EMAIL PROTECTED] Annebergsslingan 37 \ | [EMAIL PROTECTED] 654 65 KARLSTAD | | http://opalsys.net/ Mobile: +46 (0)70-332 1551 | \ gpg/f.p.: 7090 A92B 18FE 7994 0C36 4FE4 18A1 B1CF 0FE5 3DD9 / --------------------------------------------------------------- -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". 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