Odd 'hang' trying to ls a directory ...

From: Marc G. Fournier (scrappy_at_hub.org)
Date: 05/24/03

  • Next message: Marc G. Fournier: "Re: system slowdown - vnode related" 
    Date: Sat, 24 May 2003 11:42:54 -0300 (ADT)
To: freebsd-stable@freebsd.org

    Running -STABLE from May 15th, if I do an 'ls /usr', it works ... if I do
    an 'ls /vm', it hangs .. the machine doesn't hang, as far as I can tell,
    all the web sites are accessible, and there are no errors in
    /var/log/messages .. I have soft-updates disabled on that file system, and
    iostat is showing the drive array to be quite idle:

          tty da0 pass0 pass1 cpu
     tin tout KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s us ni sy in id
       0 35 0.00 0 0.00 0.00 0 0.00 0.00 0 0.00 13 0 14 1 73
       0 8 9.62 30 0.28 0.00 0 0.00 0.00 0 0.00 4 0 3 0 93
       0 8 15.00 2 0.03 0.00 0 0.00 0.00 0 0.00 7 0 1 0 92
       0 8 15.00 4 0.06 0.00 0 0.00 0.00 0 0.00 3 0 1 0 96
       0 8 15.77 30 0.46 0.00 0 0.00 0.00 0 0.00 0 0 2 0 97

    I can run 'df', but I can't run 'df -t ufs', as that too just hangs ...

    According to ps axl, I have the following in WCHAN states:

    neptune# ps axl | awk '{print $9}' | sort | uniq -c
       6 -
       1 WCHAN
     207 accept
     103 inode
       2 kqread
     412 lockf
      68 nanslp
       8 pause
       1 piperd
      13 poll
       3 psleep
      58 sbwait
       1 sched
     626 select
       1 syncer
       3 ttyin
       1 vlruwt
       8 wait

    Thoughts? Does anything above look like its 'hanging' or 'locking' the file
    system? A few minutes later, there are a few variations:

    neptune# ps axl | awk '{print $9}' | sort | uniq -c
       6 -
       1 WCHAN
     207 accept
     129 inode
     426 lockf
      67 nanslp
       8 pause
       1 piperd
      13 poll
       3 psleep
      61 sbwait
       1 sched
     622 select
       1 syncer
       3 ttyin
       1 vlruwt
       9 wait

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