Re: KDB panic with 2 vcpus

Am Donnerstag, den 22.01.2009, 15:21 +0000 schrieb Gavin Atkinson:
> On Wed, 2009-01-21 at 20:14 +0100, Mister Olli wrote:
> > Hi..
> > 
> > I'm currently trying to setup FreeBSD 8-CURRENT as a para-virtualized
> > domU on XEN 3.3.0 (with gentoo dom0).
> > 
> > When I configure 2 CPU's (using vcpus=2) in the domU config file, I get
> > the following error during bootup:
> > ==========================================================================
> > virt-001 template_8-CURRENT # xm create -c 00_template_8-CURRENT.XENconfig
> > Using config file "./00_template_8-CURRENT.XENconfig".
> > Started domain template_8-CURRENT
> > WARNING: loader(8) metadata is missing!
> > GDB: no debug ports present
> > KDB: debugger backends: ddb
> > KDB: current backend: ddb
> > Copyright (c) 1992-2009 The FreeBSD Project.
> > Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
> >         The Regents of the University of California. All rights reserved.
> > FreeBSD is a registered trademark of The FreeBSD Foundation.
> > FreeBSD 8.0-CURRENT #0: Wed Jan 14 21:47:10 CET 2009
> >     root_at_template-8_CURRENT.localdomain:/usr/obj/usr/src/sys/freebsd8_XEN
> > WARNING: WITNESS option enabled, expect reduced performance.
> > Xen reported: 1600.056 MHz processor.
> > Timecounter "ixen" frequency 1000000000 Hz quality 0
> > CPU: AMD Athlon(tm) Processor (1600.06-MHz 686-class CPU)
> >   Origin = "AuthenticAMD"  Id = 0x662  Stepping = 2
> >   Features=0x383fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE>
> >   AMD Features=0xc0480800<SYSCALL,MP,MMX+,3DNow!+,3DNow!>
> > real memory  = 268435456 (256 MB)
> > avail memory = 256045056 (244 MB)
> > gdtpfn=3e2d8 pdptpfn=28a43
> > FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
> >  cpu0 (BSP): APIC ID:  0
> >  cpu1 (AP): APIC ID:  1
> > cpu=0 irq=0 vector=0
> > cpu=0 irq=0 vector=1
> > cpu=1 irq=0 vector=0
> > cpu=1 irq=0 vector=1
> > kbd0 at kbdmux0
> > xenbus0: <Xen Devices> on motherboard
> > xc0: <Xen Console> on motherboard
> > Timecounters tick every 100.000 msec
> > xbd0: 5120MB <Virtual Block Device> at device/vbd/768 on xenbus0
> > xbd0: attaching as ad0
> > xn0: <Virtual Network Interface> at device/vif/0 on xenbus0
> > xn0: Ethernet address: 00:16:3e:11:4d:c4
> > GEOM: ad0s1: geometry does not match label (16h,63s != 255h,63s).
> > [XEN] netfront_backend_changed: newstate=2
> > [XEN] netfront_backend_changed: newstate=4
> > Spanic: blockable sleep lock (sleep mutex) XCONS LOCK _at_ /usr/src/sys/dev/xen/console/console.c:290
> > cpuid = 1
> > KDB: enter: panic
> > [thread pid 11 tid 100003 ]
> > Stopped at      kdb_enter+0x3a: movl    $0,kdb_why
> > db> 
> 
> At this point, can you enter the following commands and show the result?
> 
> bt
> show alllocks
> 
> Thanks,
> 
> Gavin


Hi...

the output is:
===========================0
...
[SNIPPING_AWAY_DMESG_MESSAGES]
[XEN] netfront_backend_changed: newstate=2
[XEN] netfront_backend_changed: newstate=4
Spanic: blockable sleep lock (sleep mutex) XCONS LOCK _at_ /usr/src/sys/dev/xen/console/console.c:290
cpuid = 1
KDB: enter: panic
[thread pid 11 tid 100003 ]
Stopped at      kdb_enter+0x3a: movl    $0,kdb_why
db> bt
Tracing pid 11 tid 100003 td 0xc14d3b40
kdb_enter(c024beb7,c024beb7,c0251ae0,c12ffd70,1,...) at kdb_enter+0x3a
panic(c0251ae0,c026584c,c02687f1,c02687b0,122,...) at panic+0x136
witness_checkorder(c041e584,9,c02687b0,122,0,...) at witness_checkorder+0xb0
_mtx_lock_flags(c041e584,0,c02687b0,122,c029b900,...) at _mtx_lock_flags+0xc4
xenbus_exists(c12ffe1c,c01f513b,c12ffe38,c007bb6f,c029b900,...) at xenbus_exists+0x2ba
xencons_tx(c12ffe38,c007bb6f,c029b900,53,c12fffb8,...) at xencons_tx+0x66
xencons_tx(c029b900,53,c12fffb8,5,53,...) at xencons_tx+0xeb
cnputc(53,c12fffb8,c12ffe68,c00e36b1,0,...) at cnputc+0x5f
ttyprintf(0,0,1000000,c14d3b40,c00e3650,...) at ttyprintf+0x1b7
ttyprintf(53,c12fffb8,0,0,0,...) at ttyprintf+0x281
kvprintf(c026f0e7,c00e3650,c12fffb8,a,c12fffe4,...) at kvprintf+0x9e
printf(c026f0e7,1,c026f06e,254,1,...) at printf+0x4e
*** error reading from address c1300000 ***
db> show allocks
No such command
db> show alllocks
Process 0 (kernel) thread 0xc02aa2b0 (100000)
exclusive sleep mutex Giant (Giant) r = 0 (0xc02abd10) locked _at_ /usr/src/sys/kern/kern_module.c:117
db> 


If there's any thing I can help on further investigating just let me know.

Greetings,
Olli