> I spoke too soon with regards to NetBSD 4 not panicing:
> 
> db> tr
> panic: Segv in kernel mode: pc %x addr %x
> Stack traceback :
> 0x89d75c64: trap+0x619(0x89d75d28)
> 0x89d75d28: trap type=0xc code=0x867cb60f pc=0x801acc04 psl=0xc00000
> 0x89d75cf4: pmap_page_protect_long+0x244(0x80422df0,0x1)
> 0x89d75d78: uvm_loan+0x377(0x83b892ac,0x1ad000,0x3000,0x86fae7e0,0x2)
> 0x89d75de8: pipe_write+0x394(0x86605744,0x86605770,0x89d75e9c,0x86712c1c,0x1)
> 0x89d75e58: 
> dofilewrite+0x77(0x80cb28cc,0x1,0x86605744,0x1ad000,0x2430,0x8660577
> 0,0x1,0x89d75f74)
> 0x89d75ed0: sys_write+0x4b(0x80cb28cc,0x89d75f54,0x89d75f74)
> 0x89d75f24: syscall_plain+0xa7(0x89d75fb4)
> 
It looks like something has trashed the pv_table :-/
Please look at the first four longwords at address 0x80422df0
(or if you have rebooted, the argument to pmap_page_protect_long() if
it happens again).  That may give a hint what is broken.

-- Ragge