kern/47074: panic: kernel diagnostic assertion "m->m_type != MT_FREE" failed: file "/home/builds/ab/HEAD/src/sys/kern/uipc_mbuf.c", line 570

[kuehro%gmx.de@localhost]

>Number:         47074
>Category:       kern
>Synopsis:       panic: kernel diagnostic assertion "m->m_type != MT_FREE" 
>failed: file "/home/builds/ab/HEAD/src/sys/kern/uipc_mbuf.c", line 570
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Oct 14 11:10:00 +0000 2012
>Originator:     Kai-Uwe Eckhardt
>Release:        NetBSD 6.99.12 amd64 GENERIC (201210120130Z from releng)
>Organization:
>Environment:
>Description:
running cvs co -P pkgsrc triggers a reboot (reproducable) with the 
following message after reboot:

panic: kernel diagnostic assertion "m->m_type != MT_FREE" failed: file 
"/home/builds/ab/HEAD/src/sys/kern/uipc_mbuf.c", line 570

Backtrace using crash -M netbsd.0.core:
 
_KERNEL_OPT_NARCNET() at 0
?() at fffffe806a171a5e
vpanic() at vpanic+0x1dd
_etext() at _etext
m_freem() at m_freem+0xa7
rum_tx_data() at rum_tx_data+0x3b6
rum_start() at rum_start+0x1a5
ifq_enqueue() at ifq_enqueue+0xbc
ether_output() at ether_output+0x53d
ip_output() at ip_output+0xcb5
tcp_output() at tcp_output+0x1697
tcp_usrreq() at tcp_usrreq+0x5b9
tcp_usrreq_wrapper() at tcp_usrreq_wrapper+0x46
soreceive() at soreceive+0x47c
dofileread() at dofileread+0x71
sys_read() at sys_read+0x62
syscall() at syscall+0x94
--- syscall (number 3) ---
7f7ff36396fa:

>How-To-Repeat:
checkout pkgsrc from anoncvs.se.netbsd.org
>Fix: