kern/45051: dom0 kernel panic with Xen41: panic: pool 'pvpl' is IPL_NONE, but called from interrupt context

[roger.pau%entel.upc.edu@localhost]

>Number:         45051
>Category:       kern
>Synopsis:       dom0 kernel panic with Xen41: panic: pool 'pvpl' is IPL_NONE, 
>but called from interrupt context
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Jun 11 17:10:01 +0000 2011
>Originator:     Roger Pau
>Release:        NetBSD 5.99.52 (XEN3_DOM0)
>Organization:
UPC
>Environment:
NetBSD loki 5.99.52 NetBSD 5.99.52 (XEN3_DOM0) #0: Sat Jun 11 11:46:31 CEST 
2011  royger@loki:/usr/obj/sys/arch/amd64/compile/XEN3_DOM0 amd64
>Description:
Got the following panic while downloading an iso with wget at 5M/s from a 
NetBSD-current dom0:

panic: pool 'pvpl' is IPL_NONE, but called from interrupt context

cpu0: Begin traceback...
copyright() at ffffffff809a3162
rb_tree_find_node() at netbsd:rb_tree_find_node+0x4a
?() at ffffffff
pool_cache_get_paddr() at netbsd:pool_cache_get_paddr+0x125
pmap_enter_ma() at netbsd:pmap_enter_ma+0x157
pmap_enter() at netbsd:pmap_enter+0x5a
_bus_dmamem_map() at netbsd:_bus_dmamem_map+0xe7
_bus_dma_alloc_bouncebuf() at netbsd:_bus_dma_alloc_bouncebuf+0xa0
_bus_dmamap_create() at netbsd:_bus_dmamap_create+0x178
bnx_alloc_pkts() at netbsd:bnx_alloc_pkts+0x66
bnx_tx_encap() at netbsd:bnx_tx_encap+0x5c
bnx_start() at netbsd:bnx_start+0x7e
ifq_enqueue() at netbsd:ifq_enqueue+0xbe
ether_output() at netbsd:ether_output+0x657
ip_output() at netbsd:ip_output+0xba0
tcp_output() at netbsd:tcp_output+0x1503
tcp_input() at netbsd:tcp_input+0x328d
ip_input() at netbsd:ip_input+0x452
ipintr() at netbsd:ipintr+0x70
softint_thread() at netbsd:softint_thread+0x92
cpu0: End traceback...

dump to dev 4,1 not possible
rebooting...
(XEN) Domain 0 shutdown: rebooting machine.
>How-To-Repeat:
wget <large file>

From a dom0 NetBSD-current. I don't know if the speed at which I was 
downloading has anything to do with the issue. Also the network card is a 
Broadcom NetXtreme II.
>Fix: