>Number: 174236
>Category: kern
>Synopsis: "kldunload ipdivert" corrupts kernel
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Dec 06 15:00:00 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator: Lutz Donnerhacke
>Release: FreeBSD 8.3-RELEASE (GENERIC)
>Organization:
IKS Service GmbH
>Environment:
FreeBSD server6 8.3-RELEASE FreeBSD 8.3-RELEASE #0: Mon Apr 9 21:23:18 UTC
2012 r...@mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64
>Description:
After unsuccessful kldunload of ipdivert.ko, all kernel module maintainence
operations block.
>How-To-Repeat:
Reboot the server to a fresh state. In short:
# kldload ipfw
# kldload ipdivert
# kldunload ipdivert
# kldstat
{hangs]
And now the glory details:
[root@server6 ~]# cat /boot/loader.conf
aacu64_load="YES"
if_lagg_load="YES"
net.inet.ip.fw.default_to_accept=1
ipfw_load="YES"
ipfw_nat_load="YES"
[root@server6 ~]# grep firewall /etc/rc.conf
firewall_enable="YES"
firewall_type="/etc/firewall.rules"
[root@server6 ~]# cat /etc/firewall.rules
-f flush
# defining NAT pools
nat 128 config ip x.y.z.128 log same_ports
[... same up to ...]
nat 159 config ip x.y.z.159 log same_ports
# active ruleset
add 10 deny log ip4 from any to any not verrevpath in
add 1128 nat 128 ipv4 from 100.64.0.0:255.192.0.31 to any out
[... same up to ...]
add 1159 nat 159 ipv4 from 100.64.0.31:255.192.0.31 to any out
add 2128 nat 128 ip4 from any to x.y.z.128
[... same up to ...]
add 2159 nat 159 ip4 from any to x.y.z.159
# Diverting dhpcv6 in future
# add 9000 divert 12345 ipv6 from fe80::/16 to ff02::1:2 via ng* in
# Allow everything
add 9999 allow all from any to any
[root@server6 ~]# kldstat
Id Refs Address Size Name
1 34 0xffffffff80100000 e56d68 kernel
2 2 0xffffffff80f57000 1a3e0 ipfw.ko
3 1 0xffffffff80f72000 192b0 aacu64.ko
4 1 0xffffffff80f8c000 c470 if_lagg.ko
5 1 0xffffffff80f99000 4088 ipfw_nat.ko
6 2 0xffffffff80f9e000 14320 libalias.ko
7 1 0xffffffff81012000 1e2c ng_socket.ko
8 7 0xffffffff81014000 8d38 netgraph.ko
9 1 0xffffffff8101d000 186a ng_mppc.ko
10 1 0xffffffff8101f000 28c rc4.ko
11 1 0xffffffff81020000 2a08 ng_l2tp.ko
12 1 0xffffffff81023000 2080 ng_ksocket.ko
13 1 0xffffffff81026000 aa8 ng_tee.ko
14 1 0xffffffff81027000 13b0 ng_iface.ko
15 1 0xffffffff81029000 45e8 ng_ppp.ko
[root@server6 ~]# kldload ipdivert
[root@server6 ~]# kldstat
Id Refs Address Size Name
1 36 0xffffffff80100000 e56d68 kernel
2 3 0xffffffff80f57000 1a3e0 ipfw.ko
3 1 0xffffffff80f72000 192b0 aacu64.ko
4 1 0xffffffff80f8c000 c470 if_lagg.ko
5 1 0xffffffff80f99000 4088 ipfw_nat.ko
6 2 0xffffffff80f9e000 14320 libalias.ko
7 1 0xffffffff81012000 1e2c ng_socket.ko
8 7 0xffffffff81014000 8d38 netgraph.ko
9 1 0xffffffff8101d000 186a ng_mppc.ko
10 1 0xffffffff8101f000 28c rc4.ko
11 1 0xffffffff81020000 2a08 ng_l2tp.ko
12 1 0xffffffff81023000 2080 ng_ksocket.ko
13 1 0xffffffff81026000 aa8 ng_tee.ko
14 1 0xffffffff81027000 13b0 ng_iface.ko
15 1 0xffffffff81029000 45e8 ng_ppp.ko
16 1 0xffffffff8102e000 1649 ipdivert.ko
[root@server6 ~]# kldunload ipdivert
kldunload: can't unload file: Operation not permitted
[root@server6 ~]# kldstat
Id Refs Address Size Name
[hangs]
<CTRL+T>
load: 0.00 cmd: kldstat 15366 [kernel linker] 98.04r 0.00u 0.00s 0% 1052k
Logging into the maschine again again.
[root@server6 ~]# ps ax | grep 1536[6]
15366 0 T+ 0:00.00 kldstat
[root@server6 ~]# procstat -k 15366
PID TID COMM TDNAME KSTACK
[hangs]
Even "procstat"ing the hanging procstat hangs.
>Fix:
Reboot
>Release-Note:
>Audit-Trail:
>Unformatted:
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