Once a week or so there is a system running 5.3-STABLE that panics for
unknown reasons (at least to me).  I haven't managed to reproduce the
problem at will but I did manage to get a dump and do a backtrace.
The kgdb session goes likes this:

--------------------8<--------------------8<--------------------

creosote# kgdb /sys/i386/compile/X6DA8-G/kernel.debug /var/crash/vmcore.2
[GDB will not be able to debug user-mode threads: /usr/lib/libthread_db.so: 
Undefined symbol "ps_pglobal_lookup"]
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".
doadump () at pcpu.h:159
(kgdb) bt
#0  doadump () at pcpu.h:159
#1  0xc04ce9e4 in boot (howto=260) at ../../../kern/kern_shutdown.c:410
#2  0xc04cec76 in panic (fmt=0xc060d89a "%s")
    at ../../../kern/kern_shutdown.c:566
#3  0xc05efb28 in trap_fatal (frame=0xe8c689bc, eva=27)
    at ../../../i386/i386/trap.c:809
#4  0xc05ef86b in trap_pfault (frame=0xe8c689bc, usermode=0, eva=27)
    at ../../../i386/i386/trap.c:727
#5  0xc05ef531 in trap (frame=
      {tf_fs = -389677032, tf_es = -1068761072, tf_ds = -1067057136, tf_edi = 
-1067134688, tf_esi = -1008631040, tf_ebp = -389641716, tf_isp = -389641752, 
tf_ebx = -1013296640, tf_edx = 4, tf_ecx = -1067009216, tf_eax = -1, tf_trapno 
= 12, tf_err = 0, tf_eip = -1068525908, tf_cs = 8, tf_eflags = 66118, tf_esp = 
-1013296640, tf_ss = 1}) at ../../../i386/i386/trap.c:417
#6  0xc05e0a0a in calltrap () at ../../../i386/i386/exception.s:140
#7  0xe8c60018 in ?? ()
#8  0xc04c0010 in prison_free (pr=0xc39a5200) at ../../../kern/kern_jail.c:277
#9  0xc04a1078 in spec_open (ap=0xe8c68a74)
    at ../../../fs/specfs/spec_vnops.c:207
#10 0xc04a0e03 in spec_vnoperate (ap=0x0)
    at ../../../fs/specfs/spec_vnops.c:118
#11 0xc051ff2d in vn_open_cred (ndp=0xe8c68be4, flagp=0xe8c68ce4, cmode=0, 
    cred=0xc5238300, fdidx=0) at vnode_if.h:228
---Type <return> to continue, or q <return> to quit---
#12 0xc051fb12 in vn_open (ndp=0x0, flagp=0xe8c68ce4, cmode=0, fdidx=3)
    at ../../../kern/vfs_vnops.c:91
#13 0xc051a06a in kern_open (td=0xc396d7d0, path=0x0, pathseg=UIO_USERSPACE, 
    flags=3, mode=0) at ../../../kern/vfs_syscalls.c:957
#14 0xc0519f94 in open (td=0xc396d7d0, uap=0x0)
    at ../../../kern/vfs_syscalls.c:926
#15 0xc05efd9f in syscall (frame=
      {tf_fs = 47, tf_es = 47, tf_ds = 47, tf_edi = -1, tf_esi = 671984685, 
tf_ebp = -1077943096, tf_isp = -389640844, tf_ebx = 671991904, tf_edx = 
671984703, tf_ecx = 674511308, tf_eax = 5, tf_trapno = 12, tf_err = 2, tf_eip = 
674018787, tf_cs = 31, tf_eflags = 658, tf_esp = -1077943188, tf_ss = 47})
    at ../../../i386/i386/trap.c:1001
#16 0xc05e0a5f in Xint0x80_syscall () at ../../../i386/i386/exception.s:201
#17 0x0000002f in ?? ()
#18 0x0000002f in ?? ()
#19 0x0000002f in ?? ()
#20 0xffffffff in ?? ()
#21 0x280dac2d in ?? ()
#22 0xbfbfe4c8 in ?? ()
#23 0xe8c68d74 in ?? ()
#24 0x280dc860 in ?? ()
#25 0x280dac3f in ?? ()
#26 0x283439cc in ?? ()
---Type <return> to continue, or q <return> to quit---
#27 0x00000005 in ?? ()
#28 0x0000000c in ?? ()
#29 0x00000002 in ?? ()
#30 0x282cb5e3 in ?? ()
#31 0x0000001f in ?? ()
#32 0x00000292 in ?? ()
#33 0xbfbfe46c in ?? ()
#34 0x0000002f in ?? ()
#35 0x00000000 in ?? ()
#36 0x00000000 in ?? ()
#37 0x00000000 in ?? ()
#38 0x00000000 in ?? ()
#39 0x53489000 in ?? ()
#40 0xc3973c5c in ?? ()
#41 0xc396d7d0 in ?? ()
#42 0xe8c686f0 in ?? ()
#43 0xe8c686d8 in ?? ()
#44 0xc34ba7d0 in ?? ()
#45 0xc04dca4b in sched_switch (td=0x280dac2d, newtd=0x280dc860, flags=Cannot 
access memory at address 0xbfbfe4d8
)
    at ../../../kern/sched_4bsd.c:865
Previous frame inner to this frame (corrupt stack?)
(kgdb) frame 8
#8  0xc04c0010 in prison_free (pr=0xc39a5200) at ../../../kern/kern_jail.c:277
warning: Source file is more recent than executable.

277     
(kgdb) list
272     }
273     
274     void
275     prison_free(struct prison *pr)
276     {
277     
278             mtx_lock(&allprison_mtx);
279             mtx_lock(&pr->pr_mtx);
280             pr->pr_ref--;
281             if (pr->pr_ref == 0) {
(kgdb) print *pr
$1 = {pr_list = {le_next = 0x4d4f4547, le_prev = 0x494d3a3a}, 
  pr_id = 1380930130, pr_ref = -1067325952, 
  pr_path = 
"\002\000\000\000home\000±TÃ$\210Æè8\210Æè\004Õ\2337\214\022\027W\002\000\000\000\000\002\000\000\000\001\000\b\000\000\003\000.s\027\021\000\000\000\000\002",
 '\0' <repeats 42 times>, "ÊGVzª\rt~?¢ÙTñÓN6", '\0' <repeats 409 times>, 
"\022\t", '\0' <repeats 26 times>, "2", '\0' <repeats 27 times>, 
"¡\036\004\000\000\000\000\000\000ãïÃ\000\000\000\000\000\000\000\0000u", '\0' 
<repeats 18 times>, "pæêÄ\000\000\000\000\020U\232Ã", '\0' <repeats 20 times>, 
"\020U\232Ã\000\000\000\000\000\000\000\000\006#\000\000\003\000\000\000\000K\000\000Ï\005\000\000\004ÿÿ\177\027\025"...,
 pr_root = 0x0, 
  pr_host = 
"\000\000\000\000\000\000\000\000\004\000\000\000\000\000\000\000ð0KÇ\002\000\000\000\000\002\000\000.\000\000\000À0KÇ\b\000\000\000\005\000\000\000ÿÿÿÿÿÿÿÿ\002\000\000\000",
 'ÿ' <repeats 12 times>, "\001\000\000\000", 'ÿ' <repeats 28 times>, 
"\004\000\000\000", 'ÿ' <repeats 152 times>, 
  pr_ip = 4294967295, pr_linux = 0xffffffff, pr_securelevel = -1, pr_task = {
    ta_link = {stqe_next = 0xffffffff}, ta_pending = -1, ta_priority = -1, 
    ta_func = 0xffffffff, ta_context = 0xffffffff}, pr_mtx = {mtx_object = {
      lo_class = 0xffffffff, lo_name = 0xffffffff "", lo_type = 0x0, 
      lo_flags = 4294967295, lo_list = {tqe_next = 0xffffffff, 
        tqe_prev = 0xffffffff}, lo_witness = 0xffffffff}, mtx_lock = 1, 
    mtx_recurse = 2504}}
(kgdb) print allprison_mtx
$2 = {mtx_object = {lo_class = 0xc064801c, lo_name = 0xc061ab3d "allprison", 
    lo_type = 0xc061ab3d "allprison", lo_flags = 196608, lo_list = {
      tqe_next = 0x0, tqe_prev = 0x0}, lo_witness = 0x0}, mtx_lock = 4, 
  mtx_recurse = 0}
(kgdb) q

--------------------8<--------------------8<--------------------

The system is a Supermicro X6DA8-G dual Xeon and the boot log is:

Mar 22 16:59:55 creosote syslogd: kernel boot file is /boot/kernel/kernel
Mar 22 16:59:55 creosote kernel: Copyright (c) 1992-2005 The FreeBSD Project.
Mar 22 16:59:55 creosote kernel: Copyright (c) 1979, 1980, 1983, 1986, 1988, 
1989, 1991, 1992, 1993, 1994
Mar 22 16:59:55 creosote kernel: The Regents of the University of California. 
All rights reserved.
Mar 22 16:59:55 creosote kernel: FreeBSD 5.3-STABLE #0: Thu Feb  3 10:36:27 CET 
2005
Mar 22 16:59:55 creosote kernel: [EMAIL 
PROTECTED]:/usr/src/sys/i386/compile/X6DA8-G
Mar 22 16:59:55 creosote kernel: Timecounter "i8254" frequency 1193182 Hz 
quality 0
Mar 22 16:59:55 creosote kernel: CPU: Intel(R) Xeon(TM) CPU 2.80GHz 
(2800.11-MHz 686-class CPU)
Mar 22 16:59:55 creosote kernel: Origin = "GenuineIntel"  Id = 0xf34  Stepping 
= 4
Mar 22 16:59:55 creosote kernel: 
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>
Mar 22 16:59:55 creosote kernel: Hyperthreading: 2 logical CPUs
Mar 22 16:59:55 creosote kernel: real memory  = 2146893824 (2047 MB)
Mar 22 16:59:55 creosote kernel: avail memory = 2095353856 (1998 MB)
Mar 22 16:59:55 creosote kernel: ACPI APIC Table: <PTLTD         APIC  >
Mar 22 16:59:55 creosote kernel: FreeBSD/SMP: Multiprocessor System Detected: 4 
CPUs
Mar 22 16:59:55 creosote kernel: cpu0 (BSP): APIC ID:  0
Mar 22 16:59:55 creosote kernel: cpu1 (AP): APIC ID:  1
Mar 22 16:59:55 creosote kernel: cpu2 (AP): APIC ID:  6
Mar 22 16:59:55 creosote kernel: cpu3 (AP): APIC ID:  7
Mar 22 16:59:55 creosote kernel: ioapic0 <Version 2.0> irqs 0-23 on motherboard
Mar 22 16:59:55 creosote kernel: ioapic1 <Version 2.0> irqs 24-47 on motherboard
Mar 22 16:59:55 creosote kernel: ioapic2 <Version 2.0> irqs 48-71 on motherboard
Mar 22 16:59:55 creosote kernel: npx0: [FAST]
Mar 22 16:59:55 creosote kernel: npx0: <math processor> on motherboard
Mar 22 16:59:55 creosote kernel: npx0: INT 16 interface
Mar 22 16:59:55 creosote kernel: acpi0: <PTLTD   RSDT> on motherboard
Mar 22 16:59:55 creosote kernel: acpi0: Power Button (fixed)
Mar 22 16:59:55 creosote kernel: Timecounter "ACPI-fast" frequency 3579545 Hz 
quality 1000
Mar 22 16:59:55 creosote kernel: acpi_timer0: <24-bit timer at 3.579545MHz> 
port 0x1008-0x100b on acpi0
Mar 22 16:59:55 creosote kernel: cpu0: <ACPI CPU> on acpi0
Mar 22 16:59:55 creosote kernel: cpu1: <ACPI CPU> on acpi0
Mar 22 16:59:55 creosote kernel: cpu2: <ACPI CPU> on acpi0
Mar 22 16:59:55 creosote kernel: cpu3: <ACPI CPU> on acpi0
Mar 22 16:59:55 creosote kernel: pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff 
on acpi0
Mar 22 16:59:55 creosote kernel: pci0: <ACPI PCI bus> on pcib0
Mar 22 16:59:55 creosote kernel: pcib1: <ACPI PCI-PCI bridge> irq 16 at device 
2.0 on pci0
Mar 22 16:59:55 creosote kernel: pci1: <ACPI PCI bus> on pcib1
Mar 22 16:59:55 creosote kernel: pcib2: <ACPI PCI-PCI bridge> irq 16 at device 
3.0 on pci0
Mar 22 16:59:55 creosote kernel: pci2: <ACPI PCI bus> on pcib2
Mar 22 16:59:55 creosote kernel: pcib3: <ACPI PCI-PCI bridge> at device 0.0 on 
pci2
Mar 22 16:59:55 creosote kernel: pci3: <ACPI PCI bus> on pcib3
Mar 22 16:59:55 creosote kernel: ahd0: <Adaptec AIC7902 Ultra320 SCSI adapter> 
port 0x2000-0x20ff,0x2400-0x24ff mem 0xd8200000-0xd8201fff irq 32 at device 2.0 
on pci3
Mar 22 16:59:55 creosote kernel: ahd0: [GIANT-LOCKED]
Mar 22 16:59:55 creosote kernel: aic7902: Ultra320 Wide Channel A, SCSI Id=7, 
PCI-X 67-100Mhz, 512 SCBs
Mar 22 16:59:55 creosote kernel: ahd1: <Adaptec AIC7902 Ultra320 SCSI adapter> 
port 0x2800-0x28ff,0x2c00-0x2cff mem 0xd8202000-0xd8203fff irq 33 at device 2.1 
on pci3
Mar 22 16:59:55 creosote kernel: ahd1: [GIANT-LOCKED]
Mar 22 16:59:55 creosote kernel: aic7902: Ultra320 Wide Channel B, SCSI Id=7, 
PCI-X 67-100Mhz, 512 SCBs
Mar 22 16:59:55 creosote kernel: pci2: <base peripheral, interrupt controller> 
at device 0.1 (no driver attached)
Mar 22 16:59:55 creosote kernel: pcib4: <ACPI PCI-PCI bridge> at device 0.2 on 
pci2
Mar 22 16:59:55 creosote kernel: pci4: <ACPI PCI bus> on pcib4
Mar 22 16:59:55 creosote kernel: em0: <Intel(R) PRO/1000 Network Connection, 
Version - 1.7.35> port 0x3000-0x303f mem 0xd8300000-0xd831ffff irq 54 at device 
2.0 on pci4
Mar 22 16:59:55 creosote kernel: em0: Ethernet address: 00:30:48:25:b3:37
Mar 22 16:59:55 creosote kernel: em0:  Speed:N/A  Duplex:N/A
Mar 22 16:59:55 creosote kernel: pci2: <base peripheral, interrupt controller> 
at device 0.3 (no driver attached)
Mar 22 16:59:55 creosote kernel: pcib5: <ACPI PCI-PCI bridge> irq 16 at device 
4.0 on pci0
Mar 22 16:59:55 creosote kernel: pci5: <ACPI PCI bus> on pcib5
Mar 22 16:59:55 creosote kernel: uhci0: <Intel 82801EB (ICH5) USB controller 
USB-A> port 0x1840-0x185f irq 16 at device 29.0 on pci0
Mar 22 16:59:55 creosote kernel: uhci0: [GIANT-LOCKED]
Mar 22 16:59:55 creosote kernel: usb0: <Intel 82801EB (ICH5) USB controller 
USB-A> on uhci0
Mar 22 16:59:55 creosote kernel: usb0: USB revision 1.0
Mar 22 16:59:55 creosote kernel: uhub0: Intel UHCI root hub, class 9/0, rev 
1.00/1.00, addr 1
Mar 22 16:59:55 creosote kernel: uhub0: 2 ports with 2 removable, self powered
Mar 22 16:59:55 creosote kernel: uhci1: <Intel 82801EB (ICH5) USB controller 
USB-B> port 0x1860-0x187f irq 19 at device 29.1 on pci0
Mar 22 16:59:55 creosote kernel: uhci1: [GIANT-LOCKED]
Mar 22 16:59:55 creosote kernel: usb1: <Intel 82801EB (ICH5) USB controller 
USB-B> on uhci1
Mar 22 16:59:55 creosote kernel: usb1: USB revision 1.0
Mar 22 16:59:55 creosote kernel: uhub1: Intel UHCI root hub, class 9/0, rev 
1.00/1.00, addr 1
Mar 22 16:59:55 creosote kernel: uhub1: 2 ports with 2 removable, self powered
Mar 22 16:59:55 creosote kernel: uhci2: <Intel 82801EB (ICH5) USB controller 
USB-C> port 0x1880-0x189f irq 18 at device 29.2 on pci0
Mar 22 16:59:55 creosote kernel: uhci2: [GIANT-LOCKED]
Mar 22 16:59:55 creosote kernel: usb2: <Intel 82801EB (ICH5) USB controller 
USB-C> on uhci2
Mar 22 16:59:55 creosote kernel: usb2: USB revision 1.0
Mar 22 16:59:55 creosote kernel: uhub2: Intel UHCI root hub, class 9/0, rev 
1.00/1.00, addr 1
Mar 22 16:59:55 creosote kernel: uhub2: 2 ports with 2 removable, self powered
Mar 22 16:59:55 creosote kernel: uhci3: <Intel 82801EB (ICH5) USB controller 
USB-D> port 0x18a0-0x18bf irq 16 at device 29.3 on pci0
Mar 22 16:59:55 creosote kernel: uhci3: [GIANT-LOCKED]
Mar 22 16:59:55 creosote kernel: usb3: <Intel 82801EB (ICH5) USB controller 
USB-D> on uhci3
Mar 22 16:59:55 creosote kernel: usb3: USB revision 1.0
Mar 22 16:59:55 creosote kernel: uhub3: Intel UHCI root hub, class 9/0, rev 
1.00/1.00, addr 1
Mar 22 16:59:55 creosote kernel: uhub3: 2 ports with 2 removable, self powered
Mar 22 16:59:55 creosote kernel: ehci0: <EHCI (generic) USB 2.0 controller> mem 
0xd8000000-0xd80003ff irq 23 at device 29.7 on pci0
Mar 22 16:59:55 creosote kernel: ehci0: [GIANT-LOCKED]
Mar 22 16:59:55 creosote kernel: ehci_pci_attach: companion usb0
Mar 22 16:59:55 creosote kernel: ehci_pci_attach: companion usb1
Mar 22 16:59:55 creosote kernel: ehci_pci_attach: companion usb2
Mar 22 16:59:55 creosote kernel: ehci_pci_attach: companion usb3
Mar 22 16:59:55 creosote kernel: usb4: EHCI version 1.0
Mar 22 16:59:55 creosote kernel: usb4: companion controllers, 2 ports each: 
usb0 usb1 usb2 usb3
Mar 22 16:59:55 creosote kernel: usb4: <EHCI (generic) USB 2.0 controller> on 
ehci0
Mar 22 16:59:55 creosote kernel: usb4: USB revision 2.0
Mar 22 16:59:55 creosote kernel: uhub4: Intel EHCI root hub, class 9/0, rev 
2.00/1.00, addr 1
Mar 22 16:59:55 creosote kernel: uhub4: single transaction translator
Mar 22 16:59:55 creosote kernel: uhub4: 8 ports with 8 removable, self powered
Mar 22 16:59:55 creosote kernel: pcib6: <ACPI PCI-PCI bridge> at device 30.0 on 
pci0
Mar 22 16:59:55 creosote kernel: pci6: <ACPI PCI bus> on pcib6
Mar 22 16:59:55 creosote kernel: pci6: <display, VGA> at device 2.0 (no driver 
attached)
Mar 22 16:59:55 creosote kernel: isab0: <PCI-ISA bridge> at device 31.0 on pci0
Mar 22 16:59:55 creosote kernel: isa0: <ISA bus> on isab0
Mar 22 16:59:56 creosote kernel: atapci0: <Intel ICH5 UDMA100 controller> port 
0x18e0-0x18ef,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7 at device 31.1 on pci0
Mar 22 16:59:56 creosote kernel: ata0: channel #0 on atapci0
Mar 22 16:59:56 creosote kernel: ata1: channel #1 on atapci0
Mar 22 16:59:56 creosote kernel: pci0: <serial bus, SMBus> at device 31.3 (no 
driver attached)
Mar 22 16:59:56 creosote kernel: pci0: <multimedia, audio> at device 31.5 (no 
driver attached)
Mar 22 16:59:56 creosote kernel: acpi_button0: <Power Button> on acpi0
Mar 22 16:59:56 creosote kernel: atkbdc0: <Keyboard controller (i8042)> port 
0x64,0x60 irq 1 on acpi0
Mar 22 16:59:56 creosote kernel: atkbd0: <AT Keyboard> irq 1 on atkbdc0
Mar 22 16:59:56 creosote kernel: kbd0 at atkbd0
Mar 22 16:59:56 creosote kernel: atkbd0: [GIANT-LOCKED]
Mar 22 16:59:56 creosote kernel: psm0: <PS/2 Mouse> irq 12 on atkbdc0
Mar 22 16:59:56 creosote kernel: psm0: [GIANT-LOCKED]
Mar 22 16:59:56 creosote kernel: psm0: model IntelliMouse Explorer, device ID 4
Mar 22 16:59:56 creosote kernel: sio0: <16550A-compatible COM port> port 
0x3f8-0x3ff irq 4 flags 0x10 on acpi0
Mar 22 16:59:56 creosote kernel: sio0: type 16550A
Mar 22 16:59:56 creosote kernel: sio1: <16550A-compatible COM port> port 
0x2f8-0x2ff irq 3 on acpi0
Mar 22 16:59:56 creosote kernel: sio1: type 16550A
Mar 22 16:59:56 creosote kernel: fdc0: <floppy drive controller> port 
0x3f7,0x3f0-0x3f5 irq 6 drq 2 on acpi0
Mar 22 16:59:56 creosote kernel: fdc0: [FAST]
Mar 22 16:59:56 creosote kernel: fd0: <1440-KB 3.5" drive> on fdc0 drive 0
Mar 22 16:59:56 creosote kernel: ppc0: <ECP parallel printer port> port 
0x778-0x77f,0x378-0x37f irq 7 drq 3 on acpi0
Mar 22 16:59:56 creosote kernel: ppc0: SMC-like chipset (ECP/EPP/PS2/NIBBLE) in 
COMPATIBLE mode
Mar 22 16:59:56 creosote kernel: ppc0: FIFO with 16/16/9 bytes threshold
Mar 22 16:59:56 creosote kernel: ppbus0: <Parallel port bus> on ppc0
Mar 22 16:59:56 creosote kernel: plip0: <PLIP network interface> on ppbus0
Mar 22 16:59:56 creosote kernel: lpt0: <Printer> on ppbus0
Mar 22 16:59:56 creosote kernel: lpt0: Interrupt-driven port
Mar 22 16:59:56 creosote kernel: ppi0: <Parallel I/O> on ppbus0
Mar 22 16:59:56 creosote kernel: pmtimer0 on isa0
Mar 22 16:59:56 creosote kernel: orm0: <ISA Option ROMs> at iomem 
0xc8000-0xc8fff,0xc0000-0xc7fff on isa0
Mar 22 16:59:56 creosote kernel: sc0: <System console> at flags 0x100 on isa0
Mar 22 16:59:56 creosote kernel: sc0: VGA <16 virtual consoles, flags=0x300>
Mar 22 16:59:56 creosote kernel: vga0: <Generic ISA VGA> at port 0x3c0-0x3df 
iomem 0xa0000-0xbffff on isa0
Mar 22 16:59:56 creosote kernel: Timecounters tick every 10.000 msec
Mar 22 16:59:56 creosote kernel: ipfw2 initialized, divert enabled, rule-based 
forwarding disabled, default to deny, logging disabled
Mar 22 16:59:56 creosote kernel: acd0: CDROM <CREATIVE CD5233E/C2.05> at 
ata1-slave PIO4
Mar 22 16:59:56 creosote kernel: Waiting 5 seconds for SCSI devices to settle
Mar 22 16:59:56 creosote kernel: (probe25:ahd1:0:6:0): No or incomplete CDB 
sent to device.
Mar 22 16:59:56 creosote kernel: ahd1: Issued Channel A Bus Reset. 9 SCBs 
aborted
Mar 22 16:59:56 creosote kernel: Interrupt storm detected on "irq16: uhci0 
uhci3"; throttling interrupt source
Mar 22 16:59:56 creosote kernel: ses0 at ahd0 bus 0 target 6 lun 0
Mar 22 16:59:56 creosote kernel: ses0: <SUPER GEM318 0> Fixed Processor SCSI-2 
device 
Mar 22 16:59:56 creosote kernel: ses0: 3.300MB/s transfers
Mar 22 16:59:56 creosote kernel: ses0: SAF-TE Compliant Device
Mar 22 16:59:56 creosote kernel: ses1 at ahd1 bus 0 target 6 lun 0
Mar 22 16:59:56 creosote kernel: ses1: <SUPER GEM318 0> Fixed Processor SCSI-2 
device 
Mar 22 16:59:56 creosote kernel: ses1: 3.300MB/s transfers
Mar 22 16:59:56 creosote kernel: ses1: SAF-TE Compliant Device
Mar 22 16:59:56 creosote kernel: da0 at ahd0 bus 0 target 0 lun 0
Mar 22 16:59:56 creosote kernel: da0: <SEAGATE ST373307LC 0007> Fixed Direct 
Access SCSI-3 device 
Mar 22 16:59:56 creosote kernel: da0: 320.000MB/s transfers (160.000MHz, offset 
63, 16bit), Tagged Queueing Enabled
Mar 22 16:59:56 creosote kernel: da0: 70007MB (143374744 512 byte sectors: 255H 
63S/T 8924C)
Mar 22 16:59:56 creosote kernel: da1 at ahd0 bus 0 target 1 lun 0
Mar 22 16:59:56 creosote kernel: da1: <SEAGATE ST373307LC 0007> Fixed Direct 
Access SCSI-3 device 
Mar 22 16:59:56 creosote kernel: da1: 320.000MB/s transfers (160.000MHz, offset 
63, 16bit), Tagged Queueing Enabled
Mar 22 16:59:56 creosote kernel: da1: 70007MB (143374744 512 byte sectors: 255H 
63S/T 8924C)
Mar 22 16:59:56 creosote kernel: da2 at ahd0 bus 0 target 2 lun 0
Mar 22 16:59:56 creosote kernel: da2: <SEAGATE ST373307LC 0007> Fixed Direct 
Access SCSI-3 device 
Mar 22 16:59:56 creosote kernel: da2: 320.000MB/s transfers (160.000MHz, offset 
63, 16bit), Tagged Queueing Enabled
Mar 22 16:59:56 creosote kernel: da2: 70007MB (143374744 512 byte sectors: 255H 
63S/T 8924C)
Mar 22 16:59:56 creosote kernel: cd0 at ata1 bus 0 target 1 lun 0
Mar 22 16:59:56 creosote kernel: cd0: <CREATIVE CD5233E 2.05> Removable CD-ROM 
SCSI-0 device 
Mar 22 16:59:56 creosote kernel: cd0: 16.000MB/s transfers
Mar 22 16:59:56 creosote kernel: cd0: Attempt to query device size failed: NOT 
READY, Medium not present
Mar 22 16:59:56 creosote kernel: GEOM_MIRROR: Device home created 
(id=932959492).
Mar 22 16:59:56 creosote kernel: GEOM_MIRROR: Device home: provider da1 
detected.
Mar 22 16:59:56 creosote kernel: GEOM_MIRROR: Device home: provider da2 
detected.
Mar 22 16:59:56 creosote kernel: GEOM_MIRROR: Device home: provider da2 
activated.
Mar 22 16:59:56 creosote kernel: GEOM_MIRROR: Device home: provider da1 
activated.
Mar 22 16:59:56 creosote kernel: GEOM_MIRROR: Device home: provider mirror/home 
launched.
Mar 22 16:59:56 creosote kernel: SMP: AP CPU #3 Launched!
Mar 22 16:59:56 creosote kernel: SMP: AP CPU #1 Launched!
Mar 22 16:59:56 creosote kernel: SMP: AP CPU #2 Launched!

--------------------8<--------------------8<--------------------

A couple of considerations insipired by a blunt keyword matching of
the forementioned logs:

  - as far as I know I don't run any process in jail.  Jls in fact
    doesn't report anything
  - if I remember well the day when I prepared this system, the only
    bleeding-edge technology it's using is gmirror.

Is there any way I could gather more clues about this problem?

Thanks in advance.

-- 
walter pelissero
http://www.pelissero.de
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