kern/111286: RELENG_6 em(4) watchdog timeout with IPSEC/mpsafenet

Nathan Ferch nf+fbsd at
Thu Apr 5 20:50:08 UTC 2007

>Number:         111286
>Category:       kern
>Synopsis:       RELENG_6 em(4) watchdog timeout with IPSEC/mpsafenet
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Apr 05 20:50:07 GMT 2007
>Originator:     Nathan Ferch
>Release:        6,2-RELEASE, 6.2-STABLE
FreeBSD threepwood 6.2-STABLE FreeBSD 6.2-STABLE #8: Thu Apr  5 12:40:54 CDT 2007     root at threepwood:/usr/obj/usr/src/sys/THREEPWOOD  i386
I am getting frequent interface lockups and watchdog timeouts with em(4) when IPSEC is loaded with mpsafenet enabled or IPSEC is compiled into the kernel.

I have not been able to reproduce the problem with other interfaces.
compile kernel:
+options                        IPSEC
+options                        IPSEC_ESP
+options                        IPSEC_DEBUG

generate network traffic:

nttcp -D  -l 65535 -T (repeat until hang/watchdog timeout)

The watchdog timeout will usually reset the interface and allow operation after a few seconds.

In the case the watchdog timeout does not kick in, bringing the interface down then up will have the same effect.

More information about the freebsd-bugs mailing list