SMP, DEVICE_POLLING and fxp LOR

From: Ed Maste (emaste_at_phaedrus.sandvine.ca)
Date: 05/30/05

  • Next message: Julian Stacey: "make cores on 5.4-RELEASE amd64 but not on i386, need a maintainer." 
    Date: Mon, 30 May 2005 09:44:43 -0400
To: freebsd-current@freebsd.org

    A few days ago I posted to -stable about a LOR observed on our 5.4-based
    tree with SMP, DEVICE_POLLING and fxp:
    http://lists.freebsd.org/pipermail/freebsd-stable/2005-May/015376.html
    Contrary to my earlier assertion, em does not have a problem.

    We do have a fair amount of local diffs, so I've now confirmed this is easily
    reproduced on unmodified -CURRENT as of 05/28.

    My config file has
    options SMP
    options DEVICE_POLLING
    device fxp
    (full config file at http://www.maste.org/~ed/sv/STOCK.1 )

    lock order reversal
     1st 0xa0783860 Giant (Giant) @ /d2/emaste/cvs_head/src/sys/kern/kern_poll.c:332
     2nd 0xa23e22a0 fxp0 (network driver) @ /d2/emaste/cvs_head/src/sys/dev/fxp/if_fxp.c:1473
    KDB: stack backtrace:
    kdb_backtrace(0,ffffffff,a07a6168,a07a4750,a0759160) at 0xa0585789 = kdb_backtrace+0x29
    witness_checkorder(a23e22a0,9,a070a173,5c1) at 0xa058f74c = witness_checkorder+0x55c
    _mtx_lock_flags(a23e22a0,0,a070a173,5c1) at 0xa05652f8 = _mtx_lock_flags+0x60
    fxp_poll(a23e2000,1,5) at 0xa04fa001 = fxp_poll+0x29
    netisr_poll(0) at 0xa0567070 = netisr_poll+0x188
    swi_net(0) at 0xa05d9041 = swi_net+0x81
    ithread_loop(a2309000,c5d8fd38,a2309000,a055aba8,0) at 0xa055acc8 = ithread_loop+0x120
    fork_exit(a055aba8,a2309000,c5d8fd38) at 0xa055a0f0 = fork_exit+0xa0
    fork_trampoline() at 0xa06ad31c = fork_trampoline+0x8

    The ether_poll_deregister in fxp_stop() looks to be the culprit. 

    --
Ed Maste, Sandvine Incorporated
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