oh right, this one ...

[Sean Bruno]

Finally got around to returning the Dell R620 series BIOS update that
breaks badly on FreeBSD.  I suspect that there is an ACPI update going
on here that I need to figure out for -current.  I'm going to disable
the pci bus that fails to attach via device hints and get an acpidump in
a bit.

pcib4: <ACPI PCI-PCI bridge> irq 53 at device 3.0 on pci0
pcib4:   domain            0
pcib4:   secondary bus     4
pcib4:   subordinate bus   4
pcib4:   no prefetched decode
pci4: <ACPI PCI bus> on pcib4
pci4: domain=0, physical bus=4
pci0: <base peripheral> at device 4.0 (no driver attached)
pci0: <base peripheral> at device 4.1 (no driver attached)
pci0: <base peripheral> at device 4.2 (no driver attached)
pci0: <base peripheral> at device 4.3 (no driver attached)
pci0: <base peripheral> at device 4.4 (no driver attached)
pci0: <base peripheral> at device 4.5 (no driver attached)
pci0: <base peripheral> at device 4.6 (no driver attached)
pci0: <base peripheral> at device 4.7 (no driver attached)
pci0: <base peripheral> at device 5.0 (no driver attached)
pci0: <base peripheral> at device 5.2 (no driver attached)
pcib5: <PCI-PCI bridge> irq 16 at device 17.0 on pci0
pcib5:   domain            0
pcib5:   secondary bus     5
pcib5:   subordinate bus   5
pcib5:   no prefetched decode
pci5: <PCI bus> on pcib5
pci5: domain=0, physical bus=5
pci0: <simple comms> at device 22.0 (no driver attached)
pci0: <simple comms> at device 22.1 (no driver attached)
ehci0: <EHCI (generic) USB 2.0 controller> mem 0xdf8fe000-0xdf8fe3ff irq
23 at device 26.0 on pci0
ioapic0: routing intpin 23 (PCI IRQ 23) to lapic 0 vector 96
usbus0: EHCI version 1.0
usbus0 on ehci0
ehci0: usbpf: Attached
pcib6: <ACPI PCI-PCI bridge> at device 28.0 on pci0
pcib6:   domain            0
pcib6:   secondary bus     6
pcib6:   subordinate bus   6
pcib6:   no prefetched decode
device_attach: pcib6 attach returned 6
pcib6: <ACPI PCI-PCI bridge> irq 19 at device 28.7 on pci0
panic: Bad tailq NEXT(0xffffffff814f3318->tqh_last) != NULL
cpuid = 0
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame
0xffffffff81bcb440
kdb_backtrace() at kdb_backtrace+0x39/frame 0xffffffff81bcb4f0
panic() at panic+0x174/frame 0xffffffff81bcb570
rman_init() at rman_init+0x166/frame 0xffffffff81bcb590
pcib_alloc_window() at pcib_alloc_window+0x87/frame 0xffffffff81bcb620
pcib_attach_common() at pcib_attach_common+0xaf9/frame
0xffffffff81bcb6b0
acpi_pcib_pci_attach() at acpi_pcib_pci_attach+0x17/frame
0xffffffff81bcb6f0
device_attach() at device_attach+0x396/frame 0xffffffff81bcb740
bus_generic_attach() at bus_generic_attach+0x4a/frame 0xffffffff81bcb760
acpi_pci_attach() at acpi_pci_attach+0x15f/frame 0xffffffff81bcb7b0
device_attach() at device_attach+0x396/frame 0xffffffff81bcb800
bus_generic_attach() at bus_generic_attach+0x4a/frame 0xffffffff81bcb820
acpi_pcib_attach() at acpi_pcib_attach+0x24d/frame 0xffffffff81bcb870
acpi_pcib_acpi_attach() at acpi_pcib_acpi_attach+0x299/frame
0xffffffff81bcb8c0
device_attach() at device_attach+0x396/frame 0xffffffff81bcb910
bus_generic_attach() at bus_generic_attach+0x4a/frame 0xffffffff81bcb930
acpi_attach() at acpi_attach+0xd58/frame 0xffffffff81bcb9f0
device_attach() at device_attach+0x396/frame 0xffffffff81bcba40
bus_generic_attach() at bus_generic_attach+0x4a/frame 0xffffffff81bcba60
nexus_acpi_attach() at nexus_acpi_attach+0x76/frame 0xffffffff81bcba90
device_attach() at device_attach+0x396/frame 0xffffffff81bcbae0
bus_generic_new_pass() at bus_generic_new_pass+0x116/frame
0xffffffff81bcbb10
bus_set_pass() at bus_set_pass+0x8f/frame 0xffffffff81bcbb40
configure() at configure+0xa/frame 0xffffffff81bcbb50
mi_startup() at mi_startup+0x118/frame 0xffffffff81bcbb70
btext() at btext+0x2c
KDB: enter: panic
[ thread pid 0 tid 100000 ]
Stopped at      kdb_enter+0x3e: movq    $0,kdb_why