On 08/08/15 05:25, Mark Johnston wrote:
> On Fri, Aug 07, 2015 at 08:04:01PM -0500, Larry Rosenman wrote:
>> Trying to debug TimeWarner IPV6 to my HE.NET tunnel, and running 
>> traceroute6, 
>> got the following panic:
>> borg.lerctr.org dumped core - see /var/crash/vmcore.0
>> Fri Aug  7 19:58:40 CDT 2015
>> FreeBSD borg.lerctr.org 11.0-CURRENT FreeBSD 11.0-CURRENT #32 r286338: Wed 
>> Aug  5 15:57:55 CDT 2015     
>> r...@borg.lerctr.org:/usr/obj/usr/src/sys/VT-LER  amd64
>> panic: Lock tcp not read locked @ /usr/src/sys/netinet/tcp_subr.c:1189
>> GNU gdb 6.1.1 [FreeBSD]
>> Copyright 2004 Free Software Foundation, Inc.
>> GDB is free software, covered by the GNU General Public License, and you are
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>> Type "show copying" to see the conditions.
>> There is absolutely no warranty for GDB.  Type "show warranty" for details.
>> This GDB was configured as "amd64-marcel-freebsd"...
>> Unread portion of the kernel message buffer:
>> panic: Lock tcp not read locked @ /usr/src/sys/netinet/tcp_subr.c:1189
> This appears to be fallout from r286227: the tcpinfo lock assertion in
> tcp_notify() is too strong, since tcp_notify() can still be called from
> c with the tcpinfo write lock held.

 Nice catch, I agree these tcpinfo lock assertion are too strong.  I am
fixing and testing that as in top of tcp_notify() and tcp_drop(), you
also need to update also tcp_close() and tcp_detach().

 By the way I am working on make INP_INFO_WLOCK a INP_INFO_RLOCK in
in6_pcbnotify() but this is not for today.



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