System freeze after PPP disconnect on Sony Vaio R505 and

From: Frank S. Fejes III (frank_at_oopdreams.com)
Date: 06/20/03

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    Date: Fri, 20 Jun 2003 04:21:27 -0500
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     5.1-RELEASE
    Message-Id: <20030620042127.000360f5.frank@oopdreams.com>
    Organization: oopdreams software, inc.
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    Hello all. I have installed FreeBSD 5.1-RELEASE on a Sony R505JL laptop
    and the system is regularly hanging/freezing after disconnecting ppp
    connections. This laptop has required a few slight configuration changes
    to run at all including:

    + changing the BIOS to disable plug and play...the kernel would panic
      during the installation otherwise
    + adding hw.pci.allow_unsupported_io_range="1" to the loader.conf file...
      the system would freeze with the insertion of a pcmcia card otherwise
    + patching /usr/src/sys/dev/pci/pci.c in order to get USB to work at all
      (see the end of the post for this patch if interested)

    As a little background on the laptop, it is ACPI-based and ships with
    a firewire docking station with cdrom and floppy. Both work under FreeBSD
    and, in fact, FreeBSD is the first free unix I've used on the laptop
    that can actually install off that firewire cdrom device (Debian Linux and
    NetBSD were the other two operating systems I've run on the laptop - btw
    the machine is stable with both).

    Back to the freeze, all I need to do to repeat it is to connect using
    ppp (ie, ppp -ddial isp) then disconnect (kill pid of the ppp process). A
    few seconds after the process has been killed the system will freeze and
    the fan will immediately start blowing on high. I cannot ping or otherwise
    connect to the machine from another machine on the network and am forced
    to use the power button. I see nothing in the error logs except, as I
    connect, I occasionally see an entry like:

    Jun 18 17:22:23 vaibsd kernel: sio4: 1 more silo overflow (total 1)

    I have enabled debugging in the kernel in hopes of perhaps seeing more
    detail before/during the freeze but see no other messages.

    On a similar (hopefully related) note, if I attempt to power down the
    machine using 'shutdown -p now', the system will also freeze at the
    poweroff point and the fan will start blowing at high. The only difference
    is that even the power button will not allow the system to reboot...I must
    physically remove and reattach the battery pack.

    If I disable ACPI then the system does not hang but I also cannot use
    the firewire device, USB, or the pcmcia slot so that's not really an
    option.

    Has anyone seen this problem or worked around it? Is there anything I
    can do on my end to try to get more detail that could help pin down
    the problem?

    Thanks!

    --frank

    PS: Here is the pci.c patch I referred to above that made USB work. Even
        if I do NOT use this patch, the system will still freeze upon ppp
        disconnect and shutdown with the -p option.

    *** pci.c.orig Tue Apr 15 22:15:08 2003
    --- pci.c Mon Jun 16 13:45:09 2003
    ***************
    *** 169,173 ****
    --- 169,175 ----
      
      static int pci_enable_io_modes = 1;
    + static int pci_route_existing = 1;
      TUNABLE_INT("hw.pci.enable_io_modes", (int *)&pci_enable_io_modes);
    + TUNABLE_INT("hw.pci.route_existing", (int *)&pci_route_existing);
      SYSCTL_INT(_hw_pci, OID_AUTO, enable_io_modes, CTLFLAG_RW,
          &pci_enable_io_modes, 1,
    ***************
    *** 175,178 ****
    --- 177,185 ----
      enable these bits correctly. We'd like to do this all the time, but
    there\n\
      are some peripherals that this causes problems with.");
    + SYSCTL_INT(_hw_pci, OID_AUTO, route_existing, CTLFLAG_RW,
    + &pci_route_existing, 1,
    + "Perform interrupt routing for devices with wired PCI interrupt
    pins\n\
    + and legacy interrupt lines. Sony VAIO GRX670 requires this for audio\n\
    + interrupts.");
      
      /* Find a device_t by bus/slot/function */
    ***************
    *** 808,811 ****
    --- 815,824 ----
                     */
                    cfg->intline = PCIB_ROUTE_INTERRUPT(pcib, dev, cfg->intpin);
    + #else
    + /*
    + * XXX: Do we need to re-program the device's PCIREG
    intline?
    + */
    + if (pci_route_existing)
    + cfg->intline = PCIB_ROUTE_INTERRUPT(pcib, dev,
    + cfg->intpin);
      #endif
                    resource_list_add(rl, SYS_RES_IRQ, 0, cfg->intline,
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