misc/37686: savecore(8) doesn't find dump

[j+nbsd%2008.salmi.ch@localhost]

>Number:         37686
>Category:       misc
>Synopsis:       savecore(8) doesn't find dump
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    misc-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jan 04 01:10:00 +0000 2008
>Originator:     Jukka Salmi
>Release:        NetBSD 4.99.48
>Environment:
System: NetBSD moray.salmi.ch 4.99.48 NetBSD 4.99.48 (GENERIC.NOACPI) #0: Fri 
Jan 4 00:15:55 CET 2008 
build%moray.salmi.ch@localhost:/b/build/nbsd/c/i386/sys/arch/i386/compile/GENERIC.NOACPI
 i386
Architecture: i386
Machine: i386
>Description:
Currently getting a kernel dump seems not to work.
>How-To-Repeat:
Create a dump (e.g. with `shutdown -d'), and see savecore(8) fail to
find it:

$ savecore -n
$ echo $?
1

$ savecore -v /a/crash
dumplo = 584584704 (1141767 * 512)
savecore: kvm_read: invalid translation (invalid PTE)

$ savecore -vf /a/crash
dumplo = 584584704 (1141767 * 512)
savecore: kvm_read: invalid translation (invalid PTE)
savecore: warning: /netbsd version mismatch:
        NetBSD 4.99.48 (GENERIC) #0: Thu Jan  3 22:49:59 CET 2008
        
build%moray.salmi.ch@localhost:/b/build/nbsd/c/i386/sys/arch/i386/compile/GENERIC

and     7

savecore: kvm_read: invalid translation (invalid PTE)
savecore: kvm_read: invalid translation (invalid PTE)
savecore: reboot
savecore: kvm_read: invalid translation (invalid PTE) (and _time_second is not 
defined also)
savecore: writing core to /a/crash/netbsd.4.core
savecore: writing kernel to /a/crash/netbsd.4
savecore: /dev/wd0b: kvm_clear_dump: invalid translation (invalid PTE)

>Fix: