I have not had time to reply earlier, partially due to network problems here. So here goes...
On Mon, Feb 21, 2005 at 03:02:49PM +0200, Tzafrir Cohen wrote: > On Mon, Feb 21, 2005 at 02:07:18PM +0200, Nadav Har'El wrote: > > On Mon, Feb 21, 2005, Tzafrir Cohen wrote about "system clock loops": > > > The following is from the output of 'date' run from the same shell about > > > 1 second apart: > > > > > > 12:13:37 > > > 13:25:08 > > > 12:13:34 > > >... > > > > > > Obviously anything that assumes a steady system clock misbehaves. > > > > > > Any idea what else may play with the system clock? > > > > > > Kernel is 2.6.8-2-686 (14), the current Debian-sarge kernel. actually: 13 > > > > I have seen this sort of nonsense when using AFS or Kerberos, which try to > > keep their own time, based on bad servers, and force their notion of time > > on the computer. > > Not here. The computer is an NFS server, though. > > After many tinkerrings I rebotted the computer to see if it could make > the problem go away. It has. For about an hour or so. > > And again, when it goes to the "future" it seems to have the safe offset > of ~ 71:31 (4291 seconds). One reboot made the problem go away, but it got back after ~half an hour. I noticed that uptime's report of the system clock (as well as the first number in /proc/uptime) is coherent with the system clock as reported by 'date' . So I think we can rule out glibc mis-reportings. Then I decided to revert back to an older kernel (2.6.7-1-386, package revision 2.6.7-2) and the problem has disappeared. The "problematic" kernel version was 2.6.8-2-686 (2.6.8-13) I have only used the newer kernel for ~2 days, so I figure that the kernel is the suspect here. I'm not sure what triggered it and I really don't want to play with this system. In both cases one of the last messages in the logs was the network adapter leaving promocious mode (me running tcpdump in the course of new network setup). Danny, Gilad, Nadav, Oron, Tzahi: thanks for the help. I still have no idea what may cause such a loop. Hardware details: boole:~# lspci 0000:00:00.0 Host bridge: Intel Corp. 82865G/PE/P DRAM Controller/Host-Hub Interface (rev 02) 0000:00:02.0 VGA compatible controller: Intel Corp. 82865G Integrated Graphics Device (rev 02) 0000:00:1d.0 USB Controller: Intel Corp. 82801EB/ER (ICH5/ICH5R) USB UHCI #1 (rev 02) 0000:00:1d.1 USB Controller: Intel Corp. 82801EB/ER (ICH5/ICH5R) USB UHCI #2 (rev 02) 0000:00:1d.2 USB Controller: Intel Corp. 82801EB/ER (ICH5/ICH5R) USB UHCI #3 (rev 02) 0000:00:1d.3 USB Controller: Intel Corp. 82801EB/ER (ICH5/ICH5R) USB UHCI #4 (rev 02) 0000:00:1d.7 USB Controller: Intel Corp. 82801EB/ER (ICH5/ICH5R) USB2 EHCI Controller (rev 02) 0000:00:1e.0 PCI bridge: Intel Corp. 82801 PCI Bridge (rev c2) 0000:00:1f.0 ISA bridge: Intel Corp. 82801EB/ER (ICH5/ICH5R) LPC Bridge (rev 02) 0000:00:1f.1 IDE interface: Intel Corp. 82801EB/ER (ICH5/ICH5R) Ultra ATA 100 Storage Controller (rev 02) 0000:00:1f.3 SMBus: Intel Corp. 82801EB/ER (ICH5/ICH5R) SMBus Controller (rev 02) 0000:00:1f.5 Multimedia audio controller: Intel Corp. 82801EB/ER (ICH5/ICH5R) AC'97 Audio Controller (rev 02) 0000:03:08.0 Ethernet controller: Intel Corp. 82562EZ 10/100 Ethernet Controller (rev 02) boole:~# lsmod Module Size Used by i830 68516 2 nfsd 178432 8 exportfs 6144 1 nfsd lockd 56520 2 nfsd sunrpc 137060 2 nfsd,lockd lp 10436 0 af_packet 20616 2 ipv6 221152 23 e100 30080 0 eepro100 28300 0 mii 4864 2 e100,eepro100 snd_intel8x0 33068 0 snd_ac97_codec 59268 1 snd_intel8x0 snd_pcm_oss 48168 0 snd_mixer_oss 16640 1 snd_pcm_oss snd_pcm 85412 2 snd_intel8x0,snd_pcm_oss snd_timer 23172 1 snd_pcm snd_page_alloc 11144 2 snd_intel8x0,snd_pcm gameport 4736 1 snd_intel8x0 snd_mpu401_uart 7296 1 snd_intel8x0 snd_rawmidi 23232 1 snd_mpu401_uart snd_seq_device 7944 1 snd_rawmidi snd 50148 9 snd_intel8x0,snd_ac97_codec,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer,snd_mpu401_uart,snd_rawmidi,snd_seq_device soundcore 9824 1 snd pciehp 84332 0 shpchp 87404 0 pci_hotplug 30640 2 pciehp,shpchp ehci_hcd 27780 0 uhci_hcd 29200 0 usbcore 100704 4 ehci_hcd,uhci_hcd intel_mch_agp 10000 0 intel_agp 17948 1 agpgart 31272 4 intel_mch_agp,intel_agp parport_pc 31552 1 parport 37320 2 lp,parport_pc floppy 54996 0 pcspkr 3816 0 nls_cp437 6016 1 isofs 32440 1 loop 14728 2 evdev 9088 0 mousedev 9996 2 tsdev 7168 0 capability 4872 0 commoncap 7168 1 capability psmouse 17800 0 ide_cd 38916 0 cdrom 35360 1 ide_cd rtc 12088 0 reiserfs 205296 3 ide_disk 16640 5 ide_generic 1664 0 piix 12448 1 ide_core 127448 4 ide_cd,ide_disk,ide_generic,piix unix 25776 250 font 8576 0 vesafb 6688 0 cfbcopyarea 3840 1 vesafb cfbimgblt 3200 1 vesafb cfbfillrect 3712 1 vesafb Note the anomality with the network adapter drivers: both e100 and eepro100 are loaded and both have a reference count of 0. We noticed the thing yesterday, tried to remove both and load just one. dmesg now shows: eepro100.c:v1.09j-t 9/29/99 Donald Becker http://www.scyld.com/network/eepro100. html eepro100.c: $Revision: 1.36 $ 2000/11/17 Modified by Andrey V. Savochkin <[EMAIL PROTECTED] w.sw.com.sg> and others eth0: OEM i82557/i82558 10/100 Ethernet, 00:0D:60:68:17:98, IRQ 20. Board assembly 000000-000, Physical connectors present: RJ45 Primary interface chip i82555 PHY #1. General self-test: passed. Serial sub-system self-test: passed. Internal registers self-test: passed. ROM checksum self-test: passed (0xed626fe2). e100: Intel(R) PRO/100 Network Driver, 3.0.18 e100: Copyright(c) 1999-2004 Intel Corporation Logs from a previous boot: Feb 20 10:33:58 boole kernel: eepro100.c:v1.09j-t 9/29/99 Donald Becker http://www.scyld.com/network/eepro100.html Feb 20 10:33:58 boole kernel: eepro100.c: $Revision: 1.36 $ 2000/11/17 Modified by Andrey V. Savochkin <[EMAIL PROTECTED]> and others Feb 20 10:33:58 boole kernel: ACPI: PCI interrupt 0000:03:08.0[A] -> GSI 20 (level, low) -> IRQ 217 Feb 20 10:33:58 boole kernel: eth0: OEM i82557/i82558 10/100 Ethernet, 00:0D:60:68:17:98, IRQ 217. Feb 20 10:33:58 boole kernel: Board assembly 000000-000, Physical connectors present: RJ45 Feb 20 10:33:58 boole kernel: Primary interface chip i82555 PHY #1. Feb 20 10:33:58 boole kernel: General self-test: passed. Feb 20 10:33:58 boole kernel: Serial sub-system self-test: passed. Feb 20 10:33:58 boole kernel: Internal registers self-test: passed. Feb 20 10:33:58 boole kernel: ROM checksum self-test: passed (0xed626fe2). Feb 20 10:33:58 boole kernel: e100: Intel(R) PRO/100 Network Driver, 3.0.18 Feb 20 10:33:58 boole kernel: e100: Copyright(c) 1999-2004 Intel Corporation -- Tzafrir Cohen | New signature for new address and | VIM is http://tzafrir.org.il | new homepage | a Mutt's [EMAIL PROTECTED] | | best ICQ# 16849755 | Space reserved for other protocols | friend ================================================================= To unsubscribe, send mail to [EMAIL PROTECTED] with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
