kern/117256: kgdb: cannot read PTD

[Oles Hnatkevych]

>Number:         117256
>Category:       kern
>Synopsis:       kgdb: cannot read PTD
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Oct 16 20:40:01 UTC 2007
>Closed-Date:
>Last-Modified:
>Originator:     Oles Hnatkevych
>Release:        6.2-STABLE
>Organization:
>Environment:
FreeBSD murzik.oles.net 6.2-STABLE FreeBSD 6.2-STABLE #2: Mon Oct 15 16:10:24 EEST 2007     root at murzik.oles.net:/usr/src/sys/i386/compile/MURZIK  i386

>Description:
I have box crashing when using fusefs ntfs module. But the problem is that kgdb can not read coredump:

murzik:root# kgdb kernel.debug /var/crash/vmcore.0
kgdb: cannot read PTD

murzik:root# more info.0
Dump header from device /dev/ad0s1b
  Architecture: i386
  Architecture Version: 2
  Dump Length: 1610158080B (1535 MB)
  Blocksize: 512
  Dumptime: Tue Oct 16 23:08:55 2007
  Hostname: murzik.oles.net
  Magic: FreeBSD Kernel Dump
  Version String: FreeBSD 6.2-STABLE #2: Mon Oct 15 16:10:24 EEST 2007
    root at murzik.oles.net:/usr/src/sys/i386/compile/MURZIK
  Panic String: page fault
  Dump Parity: 626449165
  Bounds: 0
  Dump Status: good
murzik:root# file vmcore.0
vmcore.0: ELF 32-bit LSB core file Intel 80386, invalid version (embedded)

If we can not debug the kernel we can not fix crash bugs!

>How-To-Repeat:
mount_ntfs-3g /dev/da0s1 /mnt
cd /mnt
mv some-file /root/

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: