[llvm-dev] Please help: SVN is broken

[Friedman, Eli via llvm-dev]

On 9/19/2017 6:33 PM, Zachary Turner via llvm-dev wrote:
> Hi all, for the past several days I've been dealing with intermittent 
> bot failures due to a recent series of patches which changes some 
> things about lit.
>
> Most of the dust has settled, but there's several bots that just won't 
> stay green.
>
> An example is this one:
>
> http://lab.llvm.org:8011/builders/llvm-hexagon-elf
>
> What happens in all of these cases is that SVN encounters a tree 
> conflict when updating, and then it gets stuck on some messed up of 
> the code where the test suite doesn't match up with the code being tested.
>
> But at this point I honestly think this is some kind of bug in SVN or 
> buildbot and I'm not entirely sure what to do about it.  For these 
> affected bots, I can force a clobber by setting build revision to 0 
> and forcing a build.  This will rm -rf the source tree and check out a 
> new one.  Surely this should resolve any conflicts right?  But it 
> doesn't.  For example:
>
> In this build I clobber the source tree.  You can see by clicking the 
> svn-llvm step.  You can see that all tests pass.
> http://lab.llvm.org:8011/builders/llvm-hexagon-elf/builds/9746
>
> The next build, 9747 also passes and if you click the svn-llvm step 
> you'll see that it just updates some files.
>
> But all of a sudden, 9749 fails.  If you look at the svn-llvm step 
> again, you see this:

There are two buildslaves hooked up to that builder, and those two 
builds did not run on the same slave.

-Eli

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