How to troubleshoot solid freeze-up?
kris at obsecurity.org
Sun Oct 2 15:27:41 PDT 2005
On Sun, Oct 02, 2005 at 03:59:50PM -0400, David S. Madole wrote:
> I'm looking for some tips on how to troubleshoot a possible driver
> problem. Here is the scenario:
> 1. Using a Pentium II 333Mhz mobile processor, 82443BX motherboard, and
> Intel i82559 NIC (fxp driver).
> 2. A combination of heavy disk I/O, high CPU utilization, and high
> network traffic causes a solid machine freeze-up sometime between 10
> minutes and 3 hours of running.
> 3. Replacing the NIC with a DP83815-based card (sis driver) seems to
> solve the problem. I have run the problem load for up to 8 hours without
> issue on this NIC.
> 4. The problem is reproducable on multiple identical machines with
> multiple identical NICs. Also reproducable on an i82558 NIC integrated on
> the motherboard.
> How can I go about collecting useful information to troubleshoot this
> when the machine locks solid? How can a get a core under this scenario?
> Switching to another NIC permanently is not a great solution because this
> is a semi-embedded application and I need to use the NIC on the
You can't break to DDB in the usual way, right (Ctrl+alt+esc)? Try
turning on KDB_STOP_NMI instead. Also try turning on WITNESS in case
you're seeing a lock order reversal. Actually you forgot to mention
what version of FreeBSD you're running, those suggestions only apply
to 5.x and above.
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