RE: kernel deadlock

From: Don Bowman (don_at_sandvine.com)
Date: 07/30/03

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    To: Don Bowman <don@sandvine.com>, 'Robert Watson' <rwatson@freebsd.org>, Dave Dolson <ddolson@sandvine.com>
Date: Tue, 29 Jul 2003 19:23:36 -0400

    > From: Robert Watson [mailto:rwatson@freebsd.org]
    > > On Tue, 29 Jul 2003, Dave Dolson wrote:
    > >
    > > > To follow up, I've discovered that the system has
    > exhausted its "FFS
    > > > node" malloc type.
    > ...
    > >
    > > Some problems with this have turned up in -CURRENT on large-memory
    > > machines where some of the scaling factors have been off. In
    >
    > We currently have kern.maxvnodes=70354 set (automatically
    > scaled). This
    > is a 1GB box.
    >
    > I will try re-running the test with less.
    >
    > when it hits kern.maxvnodes, what will it do?

    So I dropped kern.maxvnodes in half (to 35000). This
    has a 1GB of physical memory in a 2x xeon (w/ HTT enabled,
    so 4 procs).

    when it hit the limit, the system stopped switching amongst
    processes. my vmstat blocked in 'vlruwk'.

    I merged kern/52425 (kern/vfs_subr.c 1.249.2.30,
    kern/vfs_syscalls.c 1.151.2.18, sys/mount.h 1.89.2.7)
    which is supposed to address this, but it didn't.
    [we're running 4.7].

    after a long time, my ^C to the vmstat came through, and
    my shell prompt came back, but then bash stopped in 'inode'.

    In this case i'm not short of memory.

    the test is doing this:

    for (i = 0; i < 100000; i++)
     mkdir dir.$i
     cd dir.$i

    and while it was running i had:

    while true
    do
        vmstat -m | grep FFS
        sleep 1
    done

    running to watch it.

    So it seems the problem may not be running out of memory
    in the malloc pool, but in the vnode reclamation?

    --don
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