We relaced a SCSI disk on a IBM HS21. Right after the rebuild was completed the kernel paniced.

[root@BSDHelmut /usr/obj/usr/src/sys/GENERIC-QUOTA-PF-ALTQ]# kgdb kernel.debug /var/crash/vmcore.0
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-marcel-freebsd"...

Unread portion of the kernel message buffer:


Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x14
fault code              = supervisor read, page not present
instruction pointer     = 0x20:0xc046f58b
stack pointer           = 0x28:0xe6dd1b80
frame pointer           = 0x28:0xe6dd1b9c
code segment            = base rx0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 23 (swi2: cambio)
trap number             = 12
panic: page fault
cpuid = 0
Uptime: 1h35m11s
Physical memory: 3315 MB
Dumping 206 MB: 191 175 159 143 127 111 95 79 63 47 31 15

Reading symbols from /boot/kernel/acpi.ko...Reading symbols from /boot/kernel/acpi.ko.symbols...done.
done.
Loaded symbols for /boot/kernel/acpi.ko
#0  doadump () at pcpu.h:196
196             __asm __volatile("movl %%fs:0,%0" : "=r" (td));
(kgdb) backtrace
#0  doadump () at pcpu.h:196
#1  0xc07cc107 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:418
#2  0xc07cc3d9 in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:574
#3  0xc0adf22c in trap_fatal (frame=0xe6dd1b40, eva=20) at /usr/src/sys/i386/i386/trap.c:939
#4  0xc0adf4b0 in trap_pfault (frame=0xe6dd1b40, usermode=0, eva=20) at /usr/src/sys/i386/i386/trap.c:852
#5  0xc0adfe6c in trap (frame=0xe6dd1b40) at /usr/src/sys/i386/i386/trap.c:530
#6  0xc0ac5cdb in calltrap () at /usr/src/sys/i386/i386/exception.s:159
#7  0xc046f58b in xpt_done (done_ccb=0xc6bac400) at /usr/src/sys/cam/cam_xpt.c:4832
#8  0xc04733d9 in xpt_scan_bus (periph=0xc6804c80, request_ccb=0xc6bac400) at /usr/src/sys/cam/cam_xpt.c:5395
#9  0xc0471731 in camisr_runqueue (V_queue=Variable "V_queue" is not available.
) at /usr/src/sys/cam/cam_xpt.c:7316
#10 0xc047188e in camisr (dummy=0x0) at /usr/src/sys/cam/cam_xpt.c:7216
#11 0xc07ab10b in ithread_loop (arg=0xc6876c60) at /usr/src/sys/kern/kern_intr.c:1088
#12 0xc07a7c79 in fork_exit (callout=0xc07aaf50 <ithread_loop>, arg=0xc6876c60, frame=0xe6dd1d38)
    at /usr/src/sys/kern/kern_fork.c:804
#13 0xc0ac5d50 in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:264
(kgdb)



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 7.1-RELEASE-p4 #2: Mon Mar 23 13:39:43 CET 2009
    root@BSDHelmut:/usr/obj/usr/src/sys/GENERIC-QUOTA-PF-ALTQ
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Xeon(R) CPU           E5420  @ 2.50GHz (2500.10-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0x10676  Stepping = 6
  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=0xce3bd<SSE3,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,DCA,SSE4.1>
  AMD Features=0x20000000<LM>
  AMD Features2=0x1<LAHF>
  Cores per package: 4
real memory  = 3489382400 (3327 MB)
avail memory = 3410079744 (3252 MB)
ACPI APIC Table: <IBM    SERBLADE>
FreeBSD/SMP: Multiprocessor System Detected: 8 CPUs
 cpu0 (BSP): APIC ID:  0
 cpu1 (AP): APIC ID:  1
 cpu2 (AP): APIC ID:  2
 cpu3 (AP): APIC ID:  3
 cpu4 (AP): APIC ID:  4
 cpu5 (AP): APIC ID:  5
 cpu6 (AP): APIC ID:  6
 cpu7 (AP): APIC ID:  7
ioapic1 <Version 2.0> irqs 24-47 on motherboard
ioapic0 <Version 2.0> irqs 0-23 on motherboard
kbd1 at kbdmux0
ath_hal: 0.9.20.3 (AR5210, AR5211, AR5212, RF5111, RF5112, RF2413, RF5413)
acpi0: <IBM SERBLADE> on motherboard
acpi0: [ITHREAD]
acpi0: Power Button (fixed)
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x588-0x58b on acpi0
pcib0: <ACPI Host-PCI bridge> on acpi0
pci0: <ACPI PCI bus> on pcib0
pcib1: <ACPI PCI-PCI bridge> at device 2.0 on pci0
pci7: <ACPI PCI bus> on pcib1
pcib2: <ACPI PCI-PCI bridge> at device 0.0 on pci7
pci9: <ACPI PCI bus> on pcib2
pcib3: <ACPI PCI-PCI bridge> at device 0.0 on pci9
pci11: <ACPI PCI bus> on pcib3
pcib4: <ACPI PCI-PCI bridge> at device 1.0 on pci9
pci10: <ACPI PCI bus> on pcib4
pcib5: <ACPI PCI-PCI bridge> at device 0.3 on pci7
pci8: <ACPI PCI bus> on pcib5
pcib6: <ACPI PCI-PCI bridge> at device 3.0 on pci0
pci15: <ACPI PCI bus> on pcib6
pcib7: <ACPI PCI-PCI bridge> at device 4.0 on pci0
pci12: <ACPI PCI bus> on pcib7
pcib8: <ACPI PCI-PCI bridge> at device 5.0 on pci0
pci14: <ACPI PCI bus> on pcib8
pcib9: <ACPI PCI-PCI bridge> at device 6.0 on pci0
pci3: <ACPI PCI bus> on pcib9
pcib10: <PCI-PCI bridge> at device 0.0 on pci3
pci4: <PCI bus> on pcib10
bce0: <Broadcom NetXtreme II BCM5708 1000Base-SX (B2)> mem 0xda000000-0xdbffffff irq 17 at device 0.0 on pci4
miibus0: <MII bus> on bce0
brgphy0: <BCM5708S 1000/2500BaseSX PHY> PHY 2 on miibus0
brgphy0:  1000baseSX-FDX, auto
bce0: Ethernet address: 00:1a:64:cf:2f:18
bce0: [ITHREAD]
bce0: ASIC (0x57081021); Rev (B2); Bus (PCI-X, 64-bit, 133MHz); F/W (0x03040405); Flags( MFW MSI )
pcib11: <ACPI PCI-PCI bridge> at device 7.0 on pci0
pci5: <ACPI PCI bus> on pcib11
pcib12: <PCI-PCI bridge> at device 0.0 on pci5
pci6: <PCI bus> on pcib12
bce1: <Broadcom NetXtreme II BCM5708 1000Base-SX (B2)> mem 0xd8000000-0xd9ffffff irq 19 at device 0.0 on pci6
miibus1: <MII bus> on bce1
brgphy1: <BCM5708S 1000/2500BaseSX PHY> PHY 2 on miibus1
brgphy1:  1000baseSX-FDX, auto
bce1: Ethernet address: 00:1a:64:cf:2f:1a
bce1: [ITHREAD]
bce1: ASIC (0x57081021); Rev (B2); Bus (PCI-X, 64-bit, 133MHz); F/W (0x03040405); Flags( MSI )
pci0: <base peripheral> at device 8.0 (no driver attached)
pcib13: <ACPI PCI-PCI bridge> at device 28.0 on pci0
pci2: <ACPI PCI bus> on pcib13
mpt0: <LSILogic SAS/SATA Adapter> port 0x4000-0x40ff mem 0xdeffc000-0xdeffffff,0xdefe0000-0xdefeffff irq 16 at device 0.0 on pci2
mpt0: [ITHREAD]
mpt0: MPI Version=1.5.13.0
mpt0: Capabilities: ( RAID-0 RAID-1E RAID-1 )
mpt0: 1 Active Volume (2 Max)
mpt0: 2 Hidden Drive Members (10 Max)
uhci0: <Intel 631XESB/632XESB/3100 USB controller USB-1> port 0x2200-0x221f irq 18 at device 29.0 on pci0
uhci0: [GIANT-LOCKED]
uhci0: [ITHREAD]
usb0: <Intel 631XESB/632XESB/3100 USB controller USB-1> on uhci0
usb0: USB revision 1.0
uhub0: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb0
uhub0: 2 ports with 2 removable, self powered
uhci1: <Intel 631XESB/632XESB/3100 USB controller USB-2> port 0x2600-0x261f irq 21 at device 29.1 on pci0
uhci1: [GIANT-LOCKED]
uhci1: [ITHREAD]
usb1: <Intel 631XESB/632XESB/3100 USB controller USB-2> on uhci1
usb1: USB revision 1.0
uhub1: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb1
uhub1: 2 ports with 2 removable, self powered
uhci2: <Intel 631XESB/632XESB/3100 USB controller USB-3> port 0x2800-0x281f irq 19 at device 29.2 on pci0
uhci2: [GIANT-LOCKED]
uhci2: [ITHREAD]
usb2: <Intel 631XESB/632XESB/3100 USB controller USB-3> on uhci2
usb2: USB revision 1.0
uhub2: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb2
uhub2: 2 ports with 2 removable, self powered
ehci0: <Intel 63XXESB USB 2.0 controller> mem 0xf9000000-0xf90003ff irq 23 at device 29.7 on pci0
ehci0: [GIANT-LOCKED]
ehci0: [ITHREAD]
usb3: EHCI version 1.0
usb3: companion controllers, 2 ports each: usb0 usb1 usb2
usb3: <Intel 63XXESB USB 2.0 controller> on ehci0
usb3: USB revision 2.0
uhub3: <Intel EHCI root hub, class 9/0, rev 2.00/1.00, addr 1> on usb3
uhub3: 5 ports with 5 removable, self powered
uhub4: <vendor 0x0424 product 0x2502, class 9/0, rev 2.00/0.01, addr 2> on uhub3
uhub4: single transaction translator
uhub4: 2 ports with 2 removable, self powered
pcib14: <ACPI PCI-PCI bridge> at device 30.0 on pci0
pci1: <ACPI PCI bus> on pcib14
vgapci0: <VGA-compatible display> port 0x3000-0x30ff mem 0xf0000000-0xf7ffffff,0xf8000000-0xf800ffff irq 22 at device 1.0 on pci1
isab0: <PCI-ISA bridge> at device 31.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel 63XXESB2 SATA300 controller> port 0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0x2a00-0x2a0f at device 31.2 on pci0
ata0: <ATA channel 0> on atapci0
ata0: [ITHREAD]
ata1: <ATA channel 1> on atapci0
ata1: [ITHREAD]
sio0: <16550A-compatible COM port> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
sio0: type 16550A
sio0: [FILTER]
cpu0: <ACPI CPU> on acpi0
est0: <Enhanced SpeedStep Frequency Control> on cpu0
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 4720472006004720
device_attach: est0 attach returned 6
p4tcc0: <CPU Frequency Thermal Control> on cpu0
cpu1: <ACPI CPU> on acpi0
est1: <Enhanced SpeedStep Frequency Control> on cpu1
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 4720472006004720
device_attach: est1 attach returned 6
p4tcc1: <CPU Frequency Thermal Control> on cpu1
cpu2: <ACPI CPU> on acpi0
est2: <Enhanced SpeedStep Frequency Control> on cpu2
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 4720472006004720
device_attach: est2 attach returned 6
p4tcc2: <CPU Frequency Thermal Control> on cpu2
cpu3: <ACPI CPU> on acpi0
est3: <Enhanced SpeedStep Frequency Control> on cpu3
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 4720472006004720
device_attach: est3 attach returned 6
p4tcc3: <CPU Frequency Thermal Control> on cpu3
cpu4: <ACPI CPU> on acpi0
est4: <Enhanced SpeedStep Frequency Control> on cpu4
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 4720472006004720
device_attach: est4 attach returned 6
p4tcc4: <CPU Frequency Thermal Control> on cpu4
cpu5: <ACPI CPU> on acpi0
est5: <Enhanced SpeedStep Frequency Control> on cpu5
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 4720472006004720
device_attach: est5 attach returned 6
p4tcc5: <CPU Frequency Thermal Control> on cpu5
cpu6: <ACPI CPU> on acpi0
est6: <Enhanced SpeedStep Frequency Control> on cpu6
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 4720472006004720
device_attach: est6 attach returned 6
p4tcc6: <CPU Frequency Thermal Control> on cpu6
cpu7: <ACPI CPU> on acpi0
est7: <Enhanced SpeedStep Frequency Control> on cpu7
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 4720472006004720
device_attach: est7 attach returned 6
p4tcc7: <CPU Frequency Thermal Control> on cpu7
pmtimer0 on isa0
orm0: <ISA Option ROMs> at iomem 0xc0000-0xca7ff,0xca800-0xcbfff,0xcc000-0xcd7ff pnpid ORM0000 on isa0
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
atkbd0: [ITHREAD]
ppc0: parallel port not found.
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
sio1: configured irq 3 not in bitmap of probed irqs 0
sio1: port may not be enabled
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
Timecounters tick every 1.000 msec
mpt0:vol0(mpt0:0:0): Settings ( Hot-Plug-Spares )
mpt0:vol0(mpt0:0:0): Using Spare Pool: 0
mpt0:vol0(mpt0:0:0): 2 Members:
      (mpt0:1:4:0): Primary Online
      (mpt0:1:1:0): Secondary Online
mpt0:vol0(mpt0:0:0): RAID-1 - Optimal
mpt0:vol0(mpt0:0:0): Status ( Enabled )
(mpt0:vol0:1): Physical (mpt0:0:1:0), Pass-thru (mpt0:1:0:0)
(mpt0:vol0:1): Online
(mpt0:vol0:0): Physical (mpt0:0:4:0), Pass-thru (mpt0:1:1:0)
(mpt0:vol0:0): Online
da0 at mpt0 bus 0 target 0 lun 0
da0: <LSILOGIC Logical Volume 3000> Fixed Direct Access SCSI-2 device
da0: 300.000MB/s transfers
da0: 139236MB (285155328 512 byte sectors: 255H 63S/T 17750C)
SMP: AP CPU #2 Launched!
SMP: AP CPU #1 Launched!
SMP: AP CPU #3 Launched!
SMP: AP CPU #7 Launched!
SMP: AP CPU #6 Launched!
SMP: AP CPU #4 Launched!
SMP: AP CPU #5 Launched!
Trying to mount root from ufs:/dev/da0s1a
WARNING: / was not properly dismounted
ukbd0: <IBM IBM MM2, class 0/0, rev 1.10/0.01, addr 2> on uhub0
kbd2 at ukbd0
ums0: <IBM IBM MM2, class 0/0, rev 1.10/0.01, addr 2> on uhub0
ums0: 3 buttons and Z dir.
WARNING: /home was not properly dismounted
WARNING: /tmp was not properly dismounted
WARNING: /usr was not properly dismounted
WARNING: /var was not properly dismounted
/var: mount pending error: blocks 3112 files 23
ukbd0: at uhub0 port 2 (addr 2) disconnected
ukbd0: detached
ums0: at uhub0 port 2 (addr 2) disconnected
ums0: detached
mpt0: QUEUE FULL EVENT: Bus 0x00 Target 0x04 Depth 128

How-To-Repeat: Rebuild RAID1 volume on IBM HS21.