Date: Mon, 11 Jun 2001 10:47:54 +0100 From: Pete French <pfrench@firstcallgroup.co.uk> To: msmith@freebsd.org Cc: stable@FreeBSD.ORG Subject: Re: Very odd clock problem Message-ID: <E159OIc-000Pd8-00@dilbert.fcg.co.uk> In-Reply-To: <200106110001.f5B01k202445@mass.dis.org>
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> Er, the system clock is not capable of representing the year 1933 (in any > valid fashion). Well it surpised me too ! Can the system clock not take negative values like time_t then ? (whatever type time_t happens to be this week :-) ) I was assuming it was a signed 32 bit number and was getting set to something like 0xBB000000 or thereabouts. > This sounds like either memory corruption or an in-kernel sniper bug of > some sort. You don't help the diagnosis any by saying "losing time" and > then complaining about a "jump". The two are very different things, and > you need to be much more specific about what is actually happening. Fair comment. What happens specificly is this: I get a user (and its always the same user) who complains that the dates on his outgoing emails are being timestamped in 1933. I login, type 'date' and sure enough it says it is a date in 1933. I then reset the date. There is nothing in the log files to indicate what has happened - other than the date on other messages jumping back to sometime in May (the year isnt logged in /var/log/messages I assume, but the month change is very obvious and I am assuming this co-incides with the year date change). We were running ntpd, and stopped in case it was a corrupt ntp server somewhere. That didnt help. We have also changed ntp servers to a different set of machines. Once again to no effect. Could this be a clock battery problem at all ? I wouldnt have thought the battery was used with the machine powered up, but it is the only thing I can think of off the top of my head. It happened again this morning, there is no pattern to when the jumps occur that I can see. Heres the output of dmesg to sow you what harwarde the machine is running on. Anything else I can do to provide more info ? Copyright (c) 1992-2001 The FreeBSD Project. Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994 The Regents of the University of California. All rights reserved. FreeBSD 4.3-STABLE #0: Thu May 31 11:28:05 BST 2001 pete@toybox.twisted.org.uk:/usr/obj/usr/src/sys/TOYBOX Timecounter "i8254" frequency 1193182 Hz Timecounter "TSC" frequency 267274587 Hz CPU: AMD-K6(tm) 3D processor (267.27-MHz 586-class CPU) Origin = "AuthenticAMD" Id = 0x58c Stepping = 12 Features=0x8021bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8,PGE,MMX> AMD Features=0x80000800<SYSCALL,3DNow!> real memory = 67043328 (65472K bytes) avail memory = 62058496 (60604K bytes) Preloaded elf kernel "kernel" at 0xc0330000. K6-family MTRR support enabled (2 registers) md0: Malloc disk npx0: <math processor> on motherboard npx0: INT 16 interface pcib0: <Host to PCI bridge> on motherboard pci0: <PCI bus> on pcib0 pcib2: <VIA 82C598MVP (Apollo MVP3) PCI-PCI (AGP) bridge> at device 1.0 on pci0 pci1: <PCI bus> on pcib2 isab0: <VIA 82C586 PCI-ISA bridge> at device 7.0 on pci0 isa0: <ISA bus> on isab0 pci0: <VIA 85C586 ATA controller> at 7.1 pci0: <VIA 83C572 USB controller> at 7.2 irq 15 pci0: <ATI Mach64-GU graphics accelerator> at 8.0 xl0: <3Com 3c900B-TPO Etherlink XL> port 0xdc00-0xdc7f mem 0xe8002000-0xe800207f irq 11 at device 9.0 on pci0 xl0: Ethernet address: 00:50:da:38:22:5c xl0: selecting 10baseT transceiver, half duplex ahc0: <Adaptec 2940 Ultra SCSI adapter> port 0xe000-0xe0ff mem 0xe8001000-0xe8001fff irq 10 at device 11.0 on pci0 aic7880: Wide Channel A, SCSI Id=7, 16/255 SCBs pcib1: <Host to PCI bridge> on motherboard pci2: <PCI bus> on pcib1 fdc0: <NEC 72065B or clone> at port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on isa0 fdc0: FIFO enabled, 8 bytes threshold fd0: <1440-KB 3.5" drive> on fdc0 drive 0 atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0 atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0 kbd0 at atkbd0 vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0 sc0: <System console> at flags 0x100 on isa0 sc0: VGA <16 virtual consoles, flags=0x300> sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0 sio0: type 16550A sio1 at port 0x2f8-0x2ff irq 3 on isa0 sio1: type 16550A ppc0: <Parallel port> at port 0x378-0x37f irq 7 on isa0 ppc0: Generic chipset (NIBBLE-only) in COMPATIBLE mode plip0: <PLIP network interface> on ppbus0 lpt0: <Printer> on ppbus0 lpt0: Interrupt-driven port ppi0: <Parallel I/O> on ppbus0 Waiting 15 seconds for SCSI devices to settle Mounting root from ufs:/dev/da0s1a da1 at ahc0 bus 0 target 1 lun 0 da1: <COMPAQ HB00441AA2 5541> Fixed Direct Access SCSI-2 device da1: 40.000MB/s transfers (20.000MHz, offset 8, 16bit), Tagged Queueing Enabled da1: 4094MB (8386000 512 byte sectors: 255H 63S/T 522C) da0 at ahc0 bus 0 target 0 lun 0 da0: <COMPAQ DDRS-34560W S99C> Fixed Direct Access SCSI-2 device da0: 40.000MB/s transfers (20.000MHz, offset 8, 16bit), Tagged Queueing Enabled da0: 4094MB (8386000 512 byte sectors: 255H 63S/T 522C) WARNING: / was not properly dismounted uhci0: <VIA 83C572 USB controller> port 0xd400-0xd41f irq 15 at device 7.2 on pci0 usb0: <VIA 83C572 USB controller> on uhci0 usb0: USB revision 1.0 uhub0: VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1 uhub0: 2 ports with 2 removable, self powered To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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