Problems with latest NetBSD 7

[John Klos <john%ziaspace.com@localhost>]

In a nutshell: I updated an Atom machine which had been up for a year with 
no problems from NetBSD 7 (10-May-2015) to NetBSD 7 (24-May-2016). The 
machine is 100% stable and even recompiled the whole OS itself twice in 
the last few days.

When doing a ton of routing between two gigabit ethernet interfaces (which 
is what it does on a regular basis), it panics with the new kernel:


uvm_fault(0xffffffff810673c0, 0x0, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff809398f5 cs 8 rflags 10246 cr2 90 ilevel 0 
rsp fffffe8046a3ce30
curlwp 0xfffffe80469b59c0 pid 0.38 lowest kstack 0xfffffe8046a3a2c0
panic: trap
cpu3: Begin traceback...
vpanic() at netbsd:vpanic+0x13c
snprintf() at netbsd:snprintf
startlwp() at netbsd:startlwp
alltraps() at netbsd:alltraps+0x96
uhci_abort_xfer() at netbsd:uhci_abort_xfer+0x181
uhci_timeout_task() at netbsd:uhci_timeout_task+0x33
usb_task_thread() at netbsd:usb_task_thread+0x29
cpu3: End traceback...

dumping to dev 0,1 (offset=9981160, size=849743):
dump <4>acpitz0: workqueue busy: updates stopped



uvm_fault(0xffffffff810673c0, 0x0, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff809398f5 cs 8 rflags 10246 cr2 90 ilevel 0 
rsp fffffe80469fce30
curlwp 0xfffffe80469749c0 pid 0.38 lowest kstack 0xfffffe80469fa2c0
panic: trap
cpu3: Begin traceback...
vpanic() at netbsd:vpanic+0x13c
snprintf() at netbsd:snprintf
startlwp() at netbsd:startlwp
alltraps() at netbsd:alltraps+0x96
uhci_abort_xfer() at netbsd:uhci_abort_xfer+0x181
uhci_timeout_task() at netbsd:uhci_timeout_task+0x33
usb_task_thread() at netbsd:usb_task_thread+0x29
cpu3: End traceback...

dumping to dev 0,1 (offset=9981160, size=849743):


Any thoughts or ideas?

John Klos