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    SubjectRe: [PATCH] qdisc oops fix


    This is a different problem from previous one posted.

    Theres a small window (exposed given that you are provisioning a lot
    of qdiscs and running traffic at the same time) that an incoming packet
    interupt will cause the BUG().

    GFP_ATOMIC will fix it, but i wonder if it appropriate.

    Alexey or Manfred?

    cheers,
    jamal

    PS:- 15mbits is not a lot of traffic ;->

    On Wed, 16 Apr 2003, Catalin BOIE wrote:

    > > - sch = kmalloc(size, GFP_KERNEL);
    > > + sch = kmalloc(size, GFP_ATOMIC);
    > >
    > > mysteriously fixes the problem? Could the problem be elsewhere?
    > > Can you repost what the issue was? I am not on lk and i just saw the
    > > posting on a web page.
    >
    > With many rules (~5000 classes and ~3500 qdiscs and ~50000 filters)
    > the kernel oopses in slab.c:1128.
    > It happens on high rates (~15mbit).
    > On low rates, doesn't.
    >
    > Seems that an interrupt come and broke the memory allocation.
    >
    >
    > >>EIP; c0127ab4 <kmem_cache_grow+44/1d8> <=====
    >
    > >>EAX; ffffffff <END_OF_CODE+3fd31247/????>
    > >>EBX; c12c52c0 <END_OF_CODE+ff6508/????>
    > >>EDI; c12c52c0 <END_OF_CODE+ff6508/????>
    > >>ESP; ceab1c60 <END_OF_CODE+e7e2ea8/????>
    >
    > Trace; c0127e0f <kmalloc+eb/110>
    > Trace; c01d3cac <qdisc_create_dflt+20/bc>
    > Trace; d081ecc7 <END_OF_CODE+1054ff0f/????>
    > Trace; c01d5265 <tc_ctl_tclass+1cd/214>
    > Trace; d0820600 <END_OF_CODE+10551848/????>
    > Trace; c01d27e4 <rtnetlink_rcv+298/3bc>
    > Trace; c01d0605 <__neigh_event_send+89/1b4>
    > Trace; c01d7cd4 <netlink_data_ready+1c/60>
    > Trace; c01d7730 <netlink_unicast+230/278>
    > Trace; c01d7b73 <netlink_sendmsg+1fb/20c>
    > Trace; c01c79d5 <sock_sendmsg+69/88>
    > Trace; c01c8b48 <sys_sendmsg+18c/1e8>
    > Trace; c0120010 <map_user_kiobuf+8/f8>
    >
    >
    -
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