new lock order reversal

From: Thierry Herbelot (thierry_at_herbelot.com)
Date: 07/15/05

  • Next message: Bjoern A. Zeeb: "new lock order reversal (fwd)" 
    To: bzeeb+freebsd+lor@zabbadoz.net
Date: Fri, 15 Jul 2005 10:25:44 +0200

    Hello,

    I just had a look a the list of LOR you maintain and I did not see this one :
    (on a very recent -Current, on both a UP and an SMP machine, with straight
    GENERIC kernels)

    lock order reversal
     1st 0xc0979dc0 UMA lock (UMA lock) @ /usr/src/sys/vm/uma_core.c:1475
     2nd 0xc1061144 system map (system map) @ /usr/src/sys/vm/vm_map.c:2317
    KDB: stack backtrace:
    kdb_backtrace(0,ffffffff,c092eef8,c092f038,c08b9964) at kdb_backtrace+0x29
    witness_checkorder(c1061144,9,c0870168,90d) at witness_checkorder+0x564
    _mtx_lock_flags(c1061144,0,c0870168,90d) at _mtx_lock_flags+0x5b
    _vm_map_lock(c10610c0,c0870168,90d) at _vm_map_lock+0x26
    vm_map_remove(c10610c0,c19e0000,c19e1000,c83adc08,c077e2c1) at
    vm_map_remove+0x1f
    kmem_free(c10610c0,c19e0000,1000,c83adc38,c077dc72) at kmem_free+0x25
    page_free(c19e0000,1000,2) at page_free+0x29
    zone_drain(c104adc0) at zone_drain+0x26a
    zone_foreach(c077da08,c83adcec,c078f487,c133c180,c83adc74) at
    zone_foreach+0x37
    uma_reclaim(c133c180,c83adc74,0,c0925520,c83adc80) at uma_reclaim+0x12
    vm_pageout_scan(0,c097a220,0,c0871655,5c3) at vm_pageout_scan+0x103
    vm_pageout(0,c83add38,0,c0790240,0) at vm_pageout+0x2c3
    fork_exit(c0790240,0,c83add38) at fork_exit+0xa0
    fork_trampoline() at fork_trampoline+0x8
    --- trap 0x1, eip = 0, esp = 0xc83add6c, ebp = 0 ---

    CVS idents :

    /usr/src/sys/vm/uma_core.c:
         $FreeBSD: src/sys/vm/uma_core.c,v 1.122 2005/07/14 16:35:13 rwatson Exp $
    /usr/src/sys/vm/vm_map.c:
         $FreeBSD: src/sys/vm/vm_map.c,v 1.366 2005/05/02 07:05:20 alc Exp $

            Cheers

            TfH

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  • Next message: Bjoern A. Zeeb: "new lock order reversal (fwd)"

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