Interrupt storm detected, today's -current doesn't boot

[John Nielsen]

I am tracking -CURRENT on a Dell Optiplex GX270.  I cvsupped and installed a 
new kernel and world today, and my machine had trouble booting.

Toward the end of the kernel boot messages (and before init is started), I 
get:

Interrupt storm detected on "irq18: em0 uhci2++"; throttling interrupt 
source

The boot does not continue from that point.  It doesn't freeze, since I can 
still scroll back and forth in the buffer with scroll lock, but it stops 
doing anything useful.

I tried disabling usb in the machine's BIOS.  I got the same message, but 
"atapci0+" took the place of "uhci2++".  With ethernet AND usb disabled in 
the BIOS, the message was:

Interrupt storm detected on "irq18: atapci0+"; throttling interrupt source.

I tried booting without ACPI, with no benefit.  I was able to boot in "safe 
mode", however.  The dmesg of that boot is attached.  The important 
difference that safe mode makes is the IRQ's assigned to the devices.  In 
the problematic "normal" boot, just about everything has a high (>15) IRQ, 
whereas in a "safe" boot, all the IRQ's are in the traditional range.

A possibly related tidbit is that the floppy drive is no longer detected 
properly, and it was before today's update.  My last update before today 
was on June 7.

Does anyone know offhand what would be causing this?  What other information 
should I provide?

Thanks,

JN
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Copyright (c) 1992-2004 The FreeBSD Project.
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	The Regents of the University of California. All rights reserved.
FreeBSD 5.2-CURRENT #0: Thu Jul  1 13:29:28 MDT 2004
    john at nurse400v-gx270.byu.edu:/usr/obj/usr/src/sys/NURSE
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Pentium(R) 4 CPU 2.40GHz (2394.02-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0xf29  Stepping = 9
  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>
  Hyperthreading: 2 logical CPUs
real memory  = 1064763392 (1015 MB)
avail memory = 1036472320 (988 MB)
netsmb_dev: loaded
npx0: [FAST]
npx0: <math processor> on motherboard
npx0: INT 16 interface
pcib0: <Host to PCI bridge> at pcibus 0 on motherboard
pir0: <PCI Interrupt Routing Table: 9 Entries> on motherboard
pci0: <PCI bus> on pcib0
Trying ATA native PCI addressing mode
Trying ATA native PCI addressing mode
agp0: <Intel 82865G (865G GMCH) SVGA controller> port 0xed98-0xed9f mem 0xfeb80000-0xfebfffff,0xe8000000-0xefffffff irq 11 at device 2.0 on pci0
agp0: detected 8060k stolen memory
agp0: aperture size is 128M
uhci0: <Intel 82801EB (ICH5) USB controller USB-A> port 0xff80-0xff9f irq 11 at device 29.0 on pci0
uhci0: [GIANT-LOCKED]
usb0: <Intel 82801EB (ICH5) USB controller USB-A> on uhci0
usb0: USB revision 1.0
uhub0: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
uhci1: <Intel 82801EB (ICH5) USB controller USB-B> port 0xff60-0xff7f irq 10 at device 29.1 on pci0
uhci1: [GIANT-LOCKED]
usb1: <Intel 82801EB (ICH5) USB controller USB-B> on uhci1
usb1: USB revision 1.0
uhub1: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 2 ports with 2 removable, self powered
uhci2: <Intel 82801EB (ICH5) USB controller USB-C> port 0xff40-0xff5f irq 9 at device 29.2 on pci0
uhci2: [GIANT-LOCKED]
usb2: <Intel 82801EB (ICH5) USB controller USB-C> on uhci2
usb2: USB revision 1.0
uhub2: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub2: 2 ports with 2 removable, self powered
uhci3: <Intel 82801EB (ICH5) USB controller USB-D> port 0xff20-0xff3f irq 11 at device 29.3 on pci0
uhci3: [GIANT-LOCKED]
usb3: <Intel 82801EB (ICH5) USB controller USB-D> on uhci3
usb3: USB revision 1.0
uhub3: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub3: 2 ports with 2 removable, self powered
ums0: Logitech USB Optical Mouse, rev 1.10/21.10, addr 2, iclass 3/1
ums0: 3 buttons and Z dir.
ehci0: <EHCI (generic) USB 2.0 controller> mem 0xffa80800-0xffa80bff irq 7 at device 29.7 on pci0
ehci0: [GIANT-LOCKED]
ehci_pci_attach: companion usb0
ehci_pci_attach: companion usb1
ehci_pci_attach: companion usb2
ehci_pci_attach: companion usb3
usb4: EHCI version 1.0
usb4: companion controllers, 2 ports each: usb0 usb1 usb2 usb3
usb4: <EHCI (generic) USB 2.0 controller> on ehci0
usb4: USB revision 2.0
uhub4: Intel EHCI root hub, class 9/0, rev 2.00/1.00, addr 1
uhub4: 8 ports with 8 removable, self powered
pcib1: <PCIBIOS PCI-PCI bridge> at device 30.0 on pci0
pci1: <PCI bus> on pcib1
em0: <Intel(R) PRO/1000 Network Connection, Version - 1.7.25> port 0xdf40-0xdf7f mem 0xfeae0000-0xfeafffff irq 9 at device 12.0 on pci1
em0: [GIANT-LOCKED]
em0: Ethernet address: 00:0b:db:44:00:2c
em0:  Speed:N/A  Duplex:N/A
isab0: <PCI-ISA bridge> at device 31.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel ICH5 UDMA100 controller> port 0xffa0-0xffaf,0x374-0x377,0x170-0x177,0x3f4-0x3f7,0x1f0-0x1f7 irq 9 at device 31.1 on pci0
ata0: at 0x1f0 on atapci0
ata1: at 0x170 on atapci0
atapci1: <Intel ICH5 SATA150 controller> port 0xfea0-0xfeaf,0xfe30-0xfe33,0xfe20-0xfe27,0xfe10-0xfe13,0xfe00-0xfe07 irq 9 at device 31.2 on pci0
ata2: at 0xfe00 on atapci1
ata3: at 0xfe20 on atapci1
ichsmb0: <Intel 82801EB (ICH5) SMBus controller> port 0xeda0-0xedbf irq 5 at device 31.3 on pci0
ichsmb0: [GIANT-LOCKED]
smbus0: <System Management Bus> on ichsmb0
smb0: <SMBus generic I/O> on smbus0
pcm0: <Intel ICH5 (82801EB)> port 0xedc0-0xedff,0xee00-0xeeff mem 0xfeb7f900-0xfeb7f9ff,0xfeb7fa00-0xfeb7fbff irq 5 at device 31.5 on pci0
pcm0: [GIANT-LOCKED]
pcm0: <Analog Devices AD1981B AC97 Codec>
cpu0 on motherboard
orm0: <Option ROMs> at iomem 0xca800-0xcbfff,0xc0000-0xca7ff on isa0
atkbdc0: <Keyboard controller (i8042)> at port 0x64,0x60 on isa0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
fdc0: cannot reserve I/O port range (6 ports)
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
unknown: <PNP0700> can't assign resources (port)
unknown: <PNP0303> can't assign resources (port)
Timecounter "TSC" frequency 2394015264 Hz quality 800
Timecounters tick every 10.000 msec
em0: Link is up 100 Mbps Full Duplex
ad0: 76293MB <WDC WD800BB-75CAA0> [155009/16/63] at ata0-master PIO4
afd0: REMOVABLE <IOMEGA ZIP 250 ATAPI> at ata0-slave PIO3
acd0: CDRW <_NEC DVD+RW ND-1100A> at ata1-master PIO4
ums0: at uhub3 port 2 (addr 2) disconnected
ums0: detached
ums0: Logitech USB Optical Mouse, rev 1.10/21.10, addr 2, iclass 3/1
ums0: 3 buttons and Z dir.
cd0 at ata1 bus 0 target 0 lun 0
cd0: <_NEC DVD+RW ND-1100A 10FD> Removable CD-ROM SCSI-0 device 
cd0: 16.000MB/s transfers
cd0: Attempt to query device size failed: NOT READY, Medium not present
da0 at ata0 bus 0 target 1 lun 0
da0: <IOMEGA ZIP 250 42.S> Removable Direct Access SCSI-0 device 
da0: 11.000MB/s transfers
da0: Attempt to query device size failed: NOT READY, Medium not present
(da0:ata0:0:1:0): READ CAPACITY. CDB: 25 0 0 0 0 0 0 0 0 0 
(da0:ata0:0:1:0): CAM Status: SCSI Status Error
(da0:ata0:0:1:0): SCSI Status: Check Condition
(da0:ata0:0:1:0): NOT READY asc:3a,0
(da0:ata0:0:1:0): Medium not present
(da0:ata0:0:1:0): Unretryable error
Opened disk da0 -> 6
(da0:ata0:0:1:0): READ CAPACITY. CDB: 25 0 0 0 0 0 0 0 0 0 
(da0:ata0:0:1:0): CAM Status: SCSI Status Error
(da0:ata0:0:1:0): SCSI Status: Check Condition
(da0:ata0:0:1:0): NOT READY asc:3a,0
(da0:ata0:0:1:0): Medium not present
(da0:ata0:0:1:0): Unretryable error
Opened disk da0 -> 6
(da0:ata0:0:1:0): READ CAPACITY. CDB: 25 0 0 0 0 0 0 0 0 0 
(da0:ata0:0:1:0): CAM Status: SCSI Status Error
(da0:ata0:0:1:0): SCSI Status: Check Condition
(da0:ata0:0:1:0): NOT READY asc:3a,0
(da0:ata0:0:1:0): Medium not present
(da0:ata0:0:1:0): Unretryable error
Opened disk da0 -> 6
Mounting root from ufs:/dev/ad0s3a
em0: Link is up 100 Mbps Full Duplex
tap0: Ethernet address: 00:bd:e0:0a:00:00