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From: "Willem Jan Withagen" <wjw@withagen.nl>
To: "Willem Jan Withagen" <wjw@withagen.nl>,
	"Robert Watson" <rwatson@freebsd.org>
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Date: Sun, 18 Jul 2004 19:09:27 +0200
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cc: current@freebsd.org
Subject: Re: panic: Duplicate free of item 0xffffff005c4a8600 from
	zone0xffffff007fed4780(Mbuf)
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From: "Willem Jan Withagen" <wjw@withagen.nl>
To: "Robert Watson" <rwatson@freebsd.org>
> > On Sun, 18 Jul 2004, Willem Jan Withagen wrote:
> >
> > > Started running with debug.mpsafe=1.  Not shure if it has anything to do
> > > with it....
> >
> > It might well do, but here are some things to try:
> >
> > - See if you can reproduce this with your exact some configuration in a
> >   few runs.  If you can, then we should try some other configurations.
>
> Yup, just got almost the same one....
> It took a little longer, but perhaps cause I did not untar the port I'm trying
> to test on amd64.
>
> Slab at 0xffffff006624ffa0, freei 29 = 0.
> panic: Duplicate free of item 0xffffff006624fcb0 from zone
0xffffff007fed4180(Fi
> les)
>
> cpuid = 1;
> KDB: stack backtrace:
> kdb_backtrace() at kdb_backtrace+0x34
> panic() at panic+0x1d2
> uma_dbg_free() at uma_dbg_free+0x112
> uma_zfree_arg() at uma_zfree_arg+0x10a
> ffree() at ffree+0x8e
> fdrop_locked() at fdrop_locked+0xce
> fdrop() at fdrop+0x32
> getdirentries() at getdirentries+0x2fc
> syscall() at syscall+0x2fa
> Xfast_syscall() at Xfast_syscall+0xa8
> --- syscall (196, FreeBSD ELF64, getdirentries), rip = 0x2006a2204, rsp =
0x7fff
> ffffe758, rbp = 0x7fffffffe780 ---
> KDB: enter: panic
> [thread 100132]
> Stopped at      kdb_enter+0x2e: nop
>
> I'll try one more time.

Well not quite:
----
panic: process 47044(find):2 holds Giant but isn't blocked on a lock

cpuid = 1;
KDB: enter: panic
----
After which the console froze...

I'll try again.

--WjW