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From: "Willem Jan Withagen" <wjw@withagen.nl>
To: "Willem Jan Withagen" <wjw@withagen.nl>,
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cc: current@freebsd.org
Subject: Re: panic: Duplicate free of item 0xffffff005c4a8600 from
	zone0xffffff007fed4780(Mbuf)
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----- Original Message ----- 
From: "Willem Jan Withagen" <wjw@withagen.nl>
To: "Willem Jan Withagen" <wjw@withagen.nl>; "Robert Watson"
<rwatson@freebsd.org>

Slab at 0xffffff005c79dfb8, freei 0 = 0.
panic: Duplicate free of item 0xffffff005c79d000 from zone
0xffffff007fed4780(Mbuf)

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
mb_free_ext() at mb_free_ext+0x96
sbcompress() at sbcompress+0x1b7
sbappendstream_locked() at sbappendstream_locked+0x63
tcp_reass() at tcp_reass+0x300
tcp_input() at tcp_input+0x2af9
ip_input() at ip_input+0x94c
netisr_processqueue() at netisr_processqueue+0x8c
swi_net() at swi_net+0xe8
ithread_loop() at ithread_loop+0x18d
fork_exit() at fork_exit+0xc9
fork_trampoline() at fork_trampoline+0xe
--- trap 0, rip = 0, rsp = 0xffffffffb0bb5d00, rbp = 0 ---
KDB: enter: panic
[thread 100017]
Stopped at      kdb_enter+0x2e: nop

------

Three stikes and out....
I'll disable mpsafe now....

NOTE: the de0 was already removed from the box....

--WjW