panic: vm_page_insert: page already inserted

Hi,

from time to time I'm getting the following panic when doing a 'gbde attach'
on my external USB drive.  The panic only occurs when the box has been
running for a while (when contiguous memory is more scarce i presume).

System built of sources from Jan 24 19:19:07 CET.

panic: vm_page_insert: page already inserted
KDB: enter: panic
[thread pid 22 tid 100022 ]
Stopped at      kdb_enter+0x30: leave   
db> tr
Tracing pid 22 tid 100022 td 0xc335e680
kdb_enter(c07fa6e2,c086f840,c0814b45,d564aa14,100) at kdb_enter+0x30
panic(c0814b45,1,c0814a8a,21e,1) at panic+0xd5
vm_page_insert(c1913b98,c0882a40,16b4f,0,d6a4d000) at vm_page_insert+0x47
contigmalloc2(c1913b50,10,0,1,1) at contigmalloc2+0x160
contigmalloc(10000,c083b640,1,0,ffffffff) at contigmalloc+0xdb
bus_dmamem_alloc(c40fa280,c413e608,5,c413e604,ffffffff) at bus_dmamem_alloc+0xde
usb_block_allocmem(0,10000,1,c3b5b73c,c335d8a0) at usb_block_allocmem+0x16e
usb_allocmem(c333c000,10000,0,c3b5b73c,d564ab94) at usb_allocmem+0x57
ehci_allocm(c333c000,c3b5b73c,10000,c344d000,d564abc0) at ehci_allocm+0x27
usbd_transfer(c3b5b700,c3c3fb00,c3c7c000,d14c8000,10000) at usbd_transfer+0x61
umass_setup_transfer(c3c7c000,c3c3fb00,d14c8000,10000,4) at umass_setup_transfer+0x4f
umass_bbb_state(c33d6300,c3c7c000,0,0,0) at umass_bbb_state+0xeb
usb_transfer_complete(c33d6300,1f,c3bf7880) at usb_transfer_complete+0x193
ehci_idone(c33d6300,c33d6370,0,d564ac6c,c05211c2) at ehci_idone+0x137
ehci_check_intr(c333c000,c33d6300,c05bf550,c335e680,c333c000) at ehci_check_intr+0x8f
ehci_softintr(c333c000,d564ac9c,c0520f40,c333c000,298) at ehci_softintr+0x32
usb_schedsoftintr(c333c000,298,c07f7708,d564acb0,c33d4c80) at usb_schedsoftintr+0x12
ehci_intr1(c333c000,c33d4c80,c32ac800,d564acd8,c058c7a8) at ehci_intr1+0xc0
ehci_intr(c333c000,0,c07f7708,295,1) at ehci_intr+0x8f
ithread_execute_handlers(c335d228,c32ac800,c07f7708,2f9,c335e680) at ithread_execute_handlers+0x128
ithread_loop(c33b66b0,d564ad38,c07f74fa,30e,57029b0f) at ithread_loop+0x83
fork_exit(c058c8b0,c33b66b0,d564ad38) at fork_exit+0xc3
fork_trampoline() at fork_trampoline+0x8
--- trap 0x1, eip = 0, esp = 0xd564ad6c, ebp = 0 ---

- Christian

-- 
Christian Brueffer	chris_at_unixpages.org	brueffer_at_FreeBSD.org
GPG Key:	 http://people.freebsd.org/~brueffer/brueffer.key.asc
GPG Fingerprint: A5C8 2099 19FF AACA F41B  B29B 6C76 178C A0ED 982D