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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!caen!spool.mu.edu!agate!dog.ee.lbl.gov!news!nosc!crash!cmkrnl!jeh
- From: jeh@cmkrnl.com
- Newsgroups: comp.os.vms
- Subject: Re: Looking for advice on tracking down a system crash
- Message-ID: <1992Dec16.134649.979@cmkrnl.com>
- Date: 16 Dec 92 13:46:49 PST
- References: <1gl3jvINN36s@dayub.dayton.saic.com>
- Organization: Kernel Mode Consulting, San Diego, CA
- Lines: 30
-
- In article <1gl3jvINN36s@dayub.dayton.saic.com>, ake@dayton.saic.com (Earle Ake) writes:
- > I have a system running VMS 5.4. We have batch jobs that run one
- > process per job that control communications cards. The software was recently
- > upgraded from VMS 4.7 to 5.4. We have seen a few ramdom non-reproducible
- > system crashes recently. Every system crash is due to the same executable.
- > Each bugcheck is a Machine check while in kernal mode.
-
- $ ANALYZE/CRASH dumpfilename
-
- SDA> SHOW STACK
-
- Interpreting the stack after a machine check is processor-dependent. If you
- have access to VMS listings, check the file [V5n.SYSLOA.LIS]MCHECKxxx.LIS,
- where xxx is a code reflecting your processor type.
-
- Somewhere near the top of the stack will be a PC/PSL pair. The PC is the
- address of the instruction that caused the problem.
-
- Machine checks associated with foreign device drivers are usually caused by
- the driver trying to touch a location that doesn't exist on the I/O bus. I
- can't come up with a good reason offhand why this should be worse under
- 5.x than under 4.x. I assume that you reassembled and relinked the drivers
- under 5.x?
-
- --- Jamie Hanrahan, Kernel Mode Consulting, San Diego CA
- drivers, internals, networks, applications, and training for VMS and Windows-NT
- uucp 'g' protocol guru and release coordinator, VMSnet (DECUS uucp) W.G., and
- Chair, Programming and Internals Working Group, U.S. DECUS VMS Systems SIG
- Internet: jeh@cmkrnl.com, hanrahan@eisner.decus.org, or jeh@crash.cts.com
- Uucp: ...{crash,eisner,uunet}!cmkrnl!jeh
-