Boot panic -CURRENT #196643

[Kostik Belousov]

On Sat, Aug 29, 2009 at 08:32:34PM +0200, Andreas Tobler wrote:
> Hello,
> 
> I synced the sources today to #196643.
Try 196644.

> And built a kernel with WITNESS etc. off.
> 
> My boot partition sits on zfs.
> 
> I get the below panic. Unfortunately I can't bt since the usb keyboard 
> ist not functional at this moment.
> 
> ---
> Trying to mount root from zfs:zroot
> spin lock 0x80dccc00 (sched lock 1) held by 0x8595baf0 (tid 100003) too long
> panic: spin lock held too long
> cpuid = 0
> KDB: enter: panic
> [thread pid 1 tid 100002 ]
> Stopped at	kdb_enter+0x3a: movl	$0,kdb_why
> ---
> 
> Unfortunately I can't say exactly which version the previous, working, 
> kernel has. The svn nbr has gone. (I have this subversion:
> subversion-freebsd-1.6.5)
> 
> Here the top of the dmesg:
> 
> FreeBSD 9.0-CURRENT #0: Fri Aug 28 21:05:42 CEST 2009
>     andreast at tc.andreas.nets:/usr/obj/export/devel/fbsd/head/src/sys/TC
> Timecounter "i8254" frequency 1193182 Hz quality 0
> CPU: Intel(R) Pentium(R) 4 CPU 3.00GHz (2992.51-MHz 686-class CPU)
>   Origin = "GenuineIntel"  Id = 0xf41  Stepping = 1
> 
> Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
>   Features2=0x441d<SSE3,DTES64,MON,DS_CPL,CNXT-ID,xTPR>
>   TSC: P-state invariant
> real memory  = 2147483648 (2048 MB)
> avail memory = 2075926528 (1979 MB)
> ACPI APIC Table: <PTLTD          APIC  >
> FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
> FreeBSD/SMP: 1 package(s) x 1 core(s) x 2 HTT threads
>  cpu0 (BSP): APIC ID:  0
>  cpu1 (AP/HT): APIC ID:  1
> ...
> 
> 
> 
> I start now with a WITNESS build.
> 
> Btw, on which irc channel, (bsdcode, bsddev) could such an issue be 
> discussed?
> 
> Thanks for any hint on how to track this down.
> 
> Andreas
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