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    SubjectBug: Status/Summary of slashdot leap-second crash on new years 2008-2009
    Slashdot reported a story of Linux machines crashing on New years eve.

    Below follows a summary of the reported crashes. I'm ignoring the
    zillions of "mine didn't crash" reports, or the "you're a paranoid
    conspiracy theorist, its random chance" reports.

    So far, 31 users reported 53 hard crashes at/near midnight, new years.
    Symptoms are:
    -- hard hang (systems not pingable)
    -- irq's not serviced (if disk was active at time of crash,
    the disk activity light stays lit)
    -- cold reboot (poweroff) required
    -- systems work normally after reboot
    -- no messages in syslog, no kernel oops, no core file crash dumps
    -- not reproducible (simply setting the clock back is not enough
    to reproduce; guessing that a simulation of stratum 0 ntp server
    is needed to force the leap-second.)
    -- The affected machines seem to be running either 2.6.21, 2.6.26 or 2.6.27

    Suspect its an kernel race condition triggered by ntp bumping the second.
    -- its the leap second, since this doesn't happen other years,
    -- its a race condition, since some identically configured machines
    didn't go down, while others did.
    -- its a race condition, since majority of systems were not affected.
    -- its a race condition, since affected systems seem to have been
    mostly non-idle servers, or some non-idle desktops/ tv set-tops.
    -- ntpd is the only service that monkeys with time adjustments.

    There is a "well-known" deadlock in 2.6.21 kernels that caused this:;a=commitdiff;h=746976a301ac9c9aa10d7d42454f8d6cdad8ff2b;hp=872aad45d6174570dd2e1defc3efee50f2cfcc72

    Here's the synopsis of individual reports. Most folks left very little
    info, nor did they leave a way to contact them.

    Fedora 8 Linux server Intel p4 2.8GHz.
    ASUS P4PE 2 1-TB Seagate SATA hardrives, 1 200MB PATA drive. 2GB DDR. 1
    pchdtv5500 card, 1 winfast 2000XP tv card, 1 nVidia 6200 graphics card.

    MentalMooMan (785571) <>
    mythtv box (running mythbuntu) used to be something like 7.10 upgraded to 8.10
    2.6.27-9.19-generic ntpd version 4.2.4p4. The CPU is an AMD Athlon XP
    1700+ or 1800+. The motherboard is an EPOX EP-8KTA3Pro. message in
    /var/log/messages at boot-time:
    "warning: `ntpd' uses 32-bit capabilities (legacy support in use)"

    Anonymous Coward MythTV box on Fedora 8 (Athlon XP1700+)

    athakur999 (44340) Mythbuntu-based HTPC

    AZPolarBear (661815) Fedora 8 system

    Anonymous Coward 5 of about 70 of our production servers

    Anonymous Coward I did have two 2.6.21 servers crash last night

    Anonymous Coward Ubuntu 8.10 MythTV box.

    SanjuroE (131728) Debian testing and at that time Debian kernel

    lukas84 (912874) internal testing machine that's still on 2.6.21

    Anonymous Coward Debian testing Kernel 2.6.26

    zerosumgame (1429741) kernel 2.6.21 on older Dell 1850's

    Wibla (677432) Both my fileservers running debian etch installed from
    custom install media (pre-etchnhalf) running 2.6.21-2 and 2.6.21-6

    Maow (620678) Ubuntu 8.04 on AMD64

    Burdell (228580) <> RHEL 4 server
    RHEL 4 update 6
    Penguin Computing Altus 2600
    dual dual-core Opteron 2212 HE
    4G RAM
    nVidia MCP55 chipset
    I have 9 servers (mostly
    different hardware, but one the same as above), all running the exact
    same kernel and package set. Only one crashed; the others logged the
    leap second and went on fine.

    Pretzalzz (577309) Travis Crump <>
    debian lenny ntp=1:4.2.4p4+dfsg-7;
    Linux version 2.6.26-1-amd64 (Debian 2.6.26-4[since updated])
    Processor : 2x AMD Athlon(tm) 64 X2 Dual Core Processor 3800+

    kst (168867) Ubuntu 8.10

    arodland (127775) Debian 2.6.21

    Goodgerster (904325) <goodgerster AT gmail DOT com>

    Morgor (542294) Fedora 8 Two of our production servers running fedora 8

    Lightjumper (532700) Fedora 9 server

    blit (90883) 10 machines running Fedora Core 7

    Qwell (684661) Ubuntu 8.10

    Jim Fenton (514449) Fedora 8 machine (kernel:

    Anonymous Coward My laptop

    dmrobbin (560931) F8 box went down,

    Anonymous Coward F8 server also "hung"

    Anonymous Coward 2.6.26-1-amd64. Four of the 20 locked up

    Anonymous Coward (actually, me, Linas) amd64 dual core, ubuntu 8.04
    custom-compiled kernel, 2.6.26-64-bit

    Anonymous Coward kernel

    Anonymous Coward 3 Ubuntu 8.10 Virtual Box (3 of them)

     \ /
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