Dave,

futex comes from doing a simple strace, which showed the futex as the call
that was being blocked. My fear is that it is a holdover from an old, dead
process; we went through each process on the system and lsof -p'd it,
didn't see anything.

Thanks for the suggestion of sysrq btw, I'll try that the next time I have
access to the box, but waiting doesn't help.Also,  I don't see in sysrq the
actual ability to *kill* wayward locks however; but it will a great help us
track down the underlying issue.

Thanks,

Ed

The one thing I don't see in sysrq is a way to
As for sys