Re: Filesystem tests crashing host

[Andreas Gustafsson <gson%gson.org@localhost>]

Jukka Ruohonen wrote:
> I was thinking about the VFS changes too. These panics appear to be related
> to NFS somehow. Andreas, are you sure the time frame is correct?

Yes.  Before rmind's changes of 2011.04.11.22.31.43, there hadn't been a
single uvm_fault crash in my test runs since January, and after those
changes, every single test run has failed that way, though not always
in the same test:

  $ zgrep ' uvm_fault' 2011.0[2-4].*/test.log.gz
  2011.04.11.22.31.43/test.log.gz:    mountdhup: uvm_fault(0xc0b0f3c0, 
0xc4ba1000, 1) -> 0xe
  2011.04.11.22.37.10/test.log.gz:    mountdhup: uvm_fault(0xc0b0f3c0, 
0xc4bbf000, 1) -> 0xe
  2011.04.12.00.21.10/test.log.gz:    nfs_overwrite64k: uvm_fault(0xc0b0f3c0, 
0xc4c10000, 1) -> 0xe
  2011.04.12.07.54.16/test.log.gz:    nfs_renamerace_dirs: 
uvm_fault(0xc0b0f3c0, 0xc40b5000, 1) -> 0xe
  2011.04.12.08.39.26/test.log.gz:    nfs_renamerace_dirs: 
uvm_fault(0xc0b0f3c0, 0xc4c04000, 1) -> 0xe
  2011.04.12.08.40.34/test.log.gz:    mountdhup: uvm_fault(0xc0b0f3c0, 
0xc4b9f000, 1) -> 0xe
  2011.04.13.12.40.54/test.log.gz:    nfs_fillfs: uvm_fault(0xc0b0f3c0, 
0xff29e000, 1) -> 0xe
  2011.04.13.19.17.00/test.log.gz:    nfs_fillfs: uvm_fault(0xc0b0f3c0, 
0xc40b9000, 1) -> 0xe
  2011.04.14.01.03.23/test.log.gz:    mountdhup: uvm_fault(0xc0b0f3c0, 
0xc4c05000, 1) -> 0xe
  2011.04.14.07.06.52/test.log.gz:    mountdhup: uvm_fault(0xc0b0f3c0, 
0xc4b4d000, 1) -> 0xe

If you still doubt me, there's an easy way to prove me wrong: revert
the changes and see if the tests continue failing.
-- 
Andreas Gustafsson, gson%gson.org@localhost