Server crashed due to dbx debugger

[skiran]

Hello All,

Our tru64 server is crashing each time when a non-root user runs dbx debugger to debug his application.

Details are given bellow. This is not specific to server . He tried the same for one more server . It was also crashed.

# sizer -v
Digital UNIX V4.0G (Rev. 1530); Wed Dec 1 11:02:01 MET 2004
#

/var/adm/messages shows...

Nov 1 10:18:53 pzsd02 vmunix: trap: invalid memory read access from kernel mode
Nov 1 10:18:53 pzsd02 vmunix:
Nov 1 10:18:53 pzsd02 vmunix: faulting virtual address: 0x0000000000000060
Nov 1 10:18:53 pzsd02 vmunix: pc of faulting instruction: 0xfffffc000058d158
Nov 1 10:18:53 pzsd02 vmunix: ra contents at time of fault: 0xfffffc00004cc324
Nov 1 10:18:53 pzsd02 vmunix: sp contents at time of fault: 0xffffffffa1f375a0
Nov 1 10:18:53 pzsd02 vmunix:
Nov 1 10:18:53 pzsd02 vmunix: panic (cpu 0): kernel memory fault
Nov 1 10:18:53 pzsd02 vmunix: syncing disks... done




#uerf -c err throws bellow output

********************************* ENTRY 35. *********************************

----- EVENT INFORMATION -----

EVENT CLASS ERROR EVENT
OS EVENT TYPE 302. PANIC
SEQUENCE NUMBER 8.
OPERATING SYSTEM DEC OSF/1
OCCURRED/LOGGED ON Tue Nov 1 10:13:48 2005
OCCURRED ON SYSTEM pzsd02
SYSTEM ID x000B0022
SYSTYPE x00000000
MESSAGE panic (cpu 0): kernel memory fault

Can anyone throw some lights on this. Are there any patch available .?

Thanks ,

Shashi

[Johan Brusche]

I checked the latest patchkit for V4.0G and did not see any patches related to dbx panicing a system. 'dbx' is an old utility that has been replaced by 'ladebug' for a long time. ladebug is part of the OSFLDBBASE445 subset.

What is the program that is being debugged ?
A device driver ? Does it run outside the debugger without panicing the system ?

Rgds,
___ Johan.

[skiran]

Hi Johan ,

Thanks for your reply ..

User is running some application , It will internally call dbx for debugging .
But this user is a normal user ( Non - root ) and also application does not run using root id.
This application does not have any root setuid ot setgid bit set.

[Han Pilmeyer]

Does this happen immediately when starting dbx or with some specific command?

Is /proc mounted?

In either case, this shouldn't happen. If you have a PVS contract for V4.0G, you should open a call. Like Johan I can't remember a bug like this. Which doesn't mean that it doesn't exist. Obviously...

[skiran]

yes /proc is mounted.

Have you ever seen this kind of server crash due to some application .

[Venkatesh BL]

Atleast I don't recollect seeing anything like this on our 4.0 machine.

[Al Licause]

This conference concentrates on network issues.
Try the operating system conference for problems related to the debugger.

Al