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Unaligned kernel access

Prakash_16
Occasional Visitor

Unaligned kernel access

Hi all,

I have two Compw ES40 Servers running tru64 5.1B cluster. Oracle 9.2.0 is running on this.

Today one server rebooted with unexpectedly with the following erro:

Jul 29 11:13:38 atd1 vmunix: Unaligned kernel access va=0xfffffc00012da3dc pc=0xffffffff000b8ef8 ra=0xffffffff000bfcd0
Jul 29 11:13:38 atd1 vmunix: panic (cpu 1): Unaligned kernel space access from kernel mode

The other cluster member was intact.
It created some crash files, i can send it, if required

Can anybody give some input?

Thanks in adance

Prakash
6 REPLIES
Johan Brusche
Honored Contributor

Re: Unaligned kernel access


Based on that info nobody can give any other input than "install patchkit #4". 2 cases of "Unaligned kerne; space access..." are corrected with it.

Maybe with the crash-data.y we could make some more educated guesses, but to really analyze such panic one needs the vmunix.y and vmzcore.y

__Johan__

_JB_
Ralf Puchner
Honored Contributor

Re: Unaligned kernel access

the given message is without any technical information. Please post crash-data next time.

the "unaligned kernel access" message is too common and adresses are useless without using the same environment for debugging/analysis.
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Prakash_16
Occasional Visitor

Re: Unaligned kernel access

Hi

Thanks for the replies.
Patchkit 4 is already applied without any error. I am the crash-data file. Vmunix.N & vmzcore.N are too big to attach ( 29 & 75 MB)

Any update?

Kind regards
Ralf Puchner
Honored Contributor

Re: Unaligned kernel access

this crash-data requires deeper analyze, please open a call within the HP support center.

Analyzing and working on complex problems here in the forum is not possible.
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Johan Brusche
Honored Contributor

Re: Unaligned kernel access


Panic seems to be triggered by LAT streams code. If you do not use LAT, you should set LAT_SETUP=0 into /etc/rc.config(.common) and unload lat from the running system.

Anyway you should log a service request and make sure this incident is "elevated" to Tru64 engineering.

__Johan__

_JB_
Ralf Puchner
Honored Contributor

Re: Unaligned kernel access

correct, it seems the streams module within lat will be involved, but without an escalation this will not be fixed and maybe some "risk" after disabling lat will exists.
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