crash in xfs in current

[Daniel Wagner]

> Ok, that's good to hear. Now for some more testing: Al Viro just
> pushed some fixes to the parallel lookup code that may fix this
> problem. Al asked this question:
> 
> | Can that be triggered on 4e82901 + cherry-pick of e7d6ef979?
> | Same for 9f541801 + e7d6ef979?
> 
> Those commits are all in the current Linus tree - would you be
> able to test them? (i.e. check out tree to 4e82901, then just
> cherry pick the single commit (e7d6ef979) on top of that).

Finally I found some time to do some testing.

In one shell, git did some checkouts:

  while true; do git checkout master && git checkout b4.0; done

While in the other shell I just rebuild a kernel:

  while true; do make clean && make -j200; done

4e82901              crashed after 10 minutes
4e82901 + e7d6ef979  no crash after 4 hours
9f541801             no crash after 2 hours
9f541801 + e7d6ef979 no crash after 12 hours

cheers,
daniel