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Date:      Fri, 4 Nov 2005 11:05:19 +0100
From:      Peter Holm <peter@holm.cc>
To:        Kris Kennaway <kris@obsecurity.org>
Cc:        current@freebsd.org
Subject:   Re: panic: mb_dtor_pack: ref_cnt != 1
Message-ID:  <20051104100519.GA2203@peter.osted.lan>
In-Reply-To: <20051104092724.GA33945@xor.obsecurity.org>
References:  <20051104092724.GA33945@xor.obsecurity.org>

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On Fri, Nov 04, 2005 at 04:27:24AM -0500, Kris Kennaway wrote:
> I got this panic shortly after boot on a freshly-updated amd64
> machine:
> 

Me too: http://people.freebsd.org/~pho/stress/log/cons171.html

- Peter

> FreeBSD/amd64 (fbsd-amd64.isc.org) (ttyd0)
> 
> login: panic: mb_dtor_pack: ref_cnt != 1
> cpuid = 3
> KDB: enter: panic
> [thread pid 1021 tid 100131 ]
> Stopped at      kdb_enter+0x31: leave
> db> wh
> Tracing pid 1021 tid 100131 td 0xffffff0323816a40
> kdb_enter() at kdb_enter+0x31
> panic() at panic+0x1e6
> mb_dtor_pack() at mb_dtor_pack+0x103
> uma_zfree_arg() at uma_zfree_arg+0x34
> mb_free_ext() at mb_free_ext+0xe9
> soreceive() at soreceive+0xafb
> soo_read() at soo_read+0x5e
> dofileread() at dofileread+0x9e
> kern_readv() at kern_readv+0x4f
> read() at read+0x4b
> syscall() at syscall+0x350
> Xfast_syscall() at Xfast_syscall+0xa8
> --- syscall (3, FreeBSD ELF64, read), rip = 0x800b7e23c, rsp = 0x7fffffffe1a8, rbp = 0x400 ---
> 
> Kris
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