Re: [Openipmi-developer] BUG: soft lockup detected on CPU#1, ipmi_si

[Peter Palfrader <peter@palfrader.org>]

On Sun, 18 Jun 2006, Corey Minyard wrote:

> The IPMI driver spawns a low-priority thread that will poll the driver
> when it finds there is something to do.  It's possible that the hardware
> is not setting things properly and is always telling the driver it has
> to do something.  It's possible that the new version of the firmware
> enabled interrupts; I think there's a problem with the driver here; it
> should not really enable the kernel thread if interrupts are working. 
> The driver should also probably call schedule() instead of udelay() in
> the kernel thread when a short timeout is requested by the state machine.
> 
> In either situation, the kernel thread will sit there and spin, and if
> nothing else is scheduled for 10 seconds on that CPU you will get that
> warning.  Can you check a few things for me?
> 
> cat /proc/ipmi/0/si_stats and send me the output.

After running for about 35 minutes (and one instance of the soft lockup
warning):

| interrupts_enabled:    0
| short_timeouts:        8835
| long_timeouts:         263709
| timeout_restarts:      0
| idles:                 793108
| interrupts:            0
| attentions:            0
| flag_fetches:          2137
| hosed_count:           0
| complete_transactions: 3516
| events:                0
| watchdog_pretimeouts:  0
| incoming_messages:     0


> If you do "top", is the kipmi0 always running?

Yes, running since the system started around 11:00:

| root      1331  0.8  0.0     0    0 ?        SN   10:59   0:17  \_ [kipmi0]

> Is your IPMI interface KCS or SMIC?  The IPMI driver should report this
> in the system log at startup.

It's KCS:

| laura:~# dmesg  | grep -i ipmi
| [   85.110244] ipmi message handler version 39.0
| [   85.111491] ipmi device interface
| [   85.127866] IPMI System Interface driver.
| [   85.127929] ipmi_si: Trying SMBIOS-specified KCS state machine at I/O address 0xca2, slave address 0x20, irq 0
| [   85.274699] ipmi: Found new BMC (man_id: 0x000f85,  prod_id: 0x0000, dev_id: 0x00)
| [   85.274852]  IPMI KCS interface initialized
| [   85.284710] IPMI Watchdog: driver initialized

Cheers,
Peter
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