amd5.3beta, bug fix for it hanging machines?

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1 total messages Started by Andrew Cagney - aka Noid Tue, 11 Aug 1992 09:12

Author: Andrew Cagney - aka Noid
Date: Tue, 11 Aug 1992 09:12

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NOTE: Follow ups are to comp.bugs.4bsd.

Recently in comp.sys.sun.admin there was discussion about amd hanging
machines by leaving everything in the DW (device wait state) (1).

I, with help from the other systems staff here, have managed to find what is
causing the problem and come up with a *possible* fix.

I'd like to know if any one else has previously found and fixed this problem.
If no one has, I'll post a tentative patch(2) tomorrow (local time).

					Andrew

Andrew Cagney, Computer Science, Adelaide University, Australia

(1) Amd5.3beta, when given a configuration file that contains poorly
    constructed maps and a certain sequence of mount operations, can
    trash an internal data structure and as a consequence stop replying to
    the kernel's requests.  This in turn leaves processes in a Device Wait.

    You have to be really unlucky to hit this bug :-(

(2) I think the bug is serious enough for me to post the patch, but I'd rather
    not as chance has it someone else has fixed it already :-)

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