Messages in this thread | | | Date | Thu, 22 Jun 2006 09:03:12 -0500 | From | Corey Minyard <> | Subject | Re: [Openipmi-developer] BUG: soft lockup detected on CPU#1, ipmi_si |
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Peter, can you make a code change for me and try something out?
If possible, could you change the call to udelay(1) in the function ipmi_thread() in drivers/char/ipmi_si_intf.c to be a call to schedule() instead? I'm guessing that will fix this problem.
-Corey
Peter Palfrader wrote: > 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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