More spinlock/double fault fun...

[Peter Losher]

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So, back in late January, I reported issues with updating from 5.1 to 5.2 
on our quad-Xeon servers, and spinlock issues kept panic'ing the box at 
random intervals, etc.  To make a long story short, I reallocated the 
traffic going to that box elsewhere, and recompiled the kernel w/ 
WITNESS, and it has been rock solid since (almost three weeks).  

However, running under the "WITNESS protection program", has serious 
performance drawbacks, and I would like to see if I can get back to 
running a WITNESS-free kernel.  I tried that when I updated to 5.2.1, 
but after around 18 hours, it panic'ed again:

- -=-
Fatal double fault:
eip = 0x8063eb08
esp = 0xfb12a000
ebp = 0xfb12a000
cpuid = 1; apic id = 01
panic: double fault
cpuid = 1;
Debugger("panic")
Stopped at      Debugger+0x55:  xchgl   %ebx,in_Debugger.0
db> tr
Debugger(8085812b,1,8087268e,80939ee8,100) at Debugger+0x55
panic(8087268e,1,0,0,0) at panic+0x156
dblfault_handler(808ecfcc,1,60,8d324000,8090e800) at 
dblfault_handler+0x8c
db> panic
panic: from debugger
cpuid = 1;
boot() called on cpu#1
Uptime: 18h38m1s
- -=-

Any Ideas?  If there is missing information here, let me know as well.

Best Wishes - Peter
- -- 
Peter_Losher at isc.org | ISC | OpenPGP Key E8048D08 | "The bits must flow"
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