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From: Damian Gerow <dgerow@afflictions.org>
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Subject: Re: Fatal double fault with 20031116-JPSNAP
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Date: Sun, 30 Nov 2003 19:34:44 -0000
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Thus spake Damian Gerow (dgerow@afflictions.org) [29/11/03 17:04]:
> But this is a little OT.  I'll find some way to update my system, and
> respond back if the problem's fixed or not in a later -CURRENT.

Nope:

    # uname -a
    FreeBSD  5.2-BETA-20031129-JPSNAP FreeBSD 5.2-BETA-20031129-JPSNAP #0: Sat Nov 29 02:47:57 GMT 2003 root@ushi.jp.freebsd.org:/usr/obj/usr/src/sys/GENERIC  i386
    # make buildworld
    <snip>

    panic: Duplicate free of item 0xc1cd8e1c from zone 0xc102e1c0(PV ENTRY)

    cpuid = 0; 
    Debugger("panic")
    Stopped at      Debugger+0x55:  xchgl   %ebx,in_Debugger.0
    db> trace
    Debugger(c0898ddc,0,c08b186e,d8a11c10,100) at Debugger+0x55
    panic(c08b186e,c1cd8e1c,c102e1c0,c08b66c4,c08b13a5) at panic+0x156
    uma_dbg_free(c102e1c0,0,c1cd8e1c,6d0,0) at uma_dbg_free+0x111
    uma_zfree_arg(c102e1c0,c1cd8e1c,0,a2f,c08968de) at uma_zfree_arg+0x123
    pmap_remove_pages(c1d0ef60,0,bfc00000,11a,c08968de) at
    pmap_remove_pages+0x209
    exit1(c4712c80,0,c08968de,65,d8a11d40) at exit1+0x66c
    sys_exit(c4712c80,d8a11d14,c08b6d61,3ee,1) at sys_exit+0x41
    syscall(2f,2f,2f,bfbfe938,0) at syscall+0x2c0
    Xint0x80_syscall() at Xint0x80_syscall+0x1d
    --- syscall (1, FreeBSD ELF32, sys_exit), eip = 0x826aa63, esp = 0xbfbfe8f4, ebp = 0xbfbfe910 ---
    db> show pcpu 0
    cpuid        = 0
    curthread    = 0xc4712c80: pid 34357 "cc1"
    curpcb       = 0xd8a11da0
    fpcurthread  = none
    idlethread   = 0xc1cff640: pid 11 "idle: cpu0"
    APIC ID      = 0
    currentldt   = 0x28
    spin locks held:
    db> 

It /does/ take a bit longer to get to, and I didn't see any of the previous
console-flooding messages.  But the panic still happens.