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Commands in /etc/rc.local Fail

On boot, wlan0 fails to come up.  After login,
> sudo ifup wlan0
works.

> uname -a
Linux zd7000 2.6.32-5-686 #1 SMP Sun Sep 23 09:49:36 UTC 2012 i686 GNU/Linux

> cat  /etc/rc.local
/sbin/modprobe -r b43
/sbin/modprobe b43
/sbin/ifup wlan0
exit 0

But, the b43-pci-bridge driver is still in use.

Why do these commands not work?

> lspci -vnn
<snip>
02:03.0 Network controller [0280]: Broadcom Corporation BCM4306 802.11b/g Wireless LAN Controller [14e4:4320] (rev 03) Subsystem: Hewlett-Packard Company Broadcom 802.11b/g WLAN [103c:12f4] 
        Flags: bus master, fast devsel, latency 32, IRQ 21
        Memory at d2004000 (32-bit, non-prefetchable) [size=8K]
        Kernel driver in use: b43-pci-bridge

After boot, wlan0 is not up.

However, from the command line,
> sudo ifup wlan0
> sudo ifconfig
<snip>
wlan0     Link encap:Ethernet  HWaddr 00:90:4b:52:82:8a
          inet addr:192.168.2.10  Bcast:192.168.2.255  \
              Mask:255.255.255.0
          inet6 addr: fe80::290:4bff:fe52:828a/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:505 errors:0 dropped:0 overruns:0 frame:0
          TX packets:239 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:54845 (53.5 KiB)  TX bytes:67723 (66.1 KiB)

and, networking works.
I enabled verbose in /etc/init.d/rc.local and see the proper message on the console. 
... "Running local boot scripts (/etc/rc.local)"
followed by lots of ioctl[SIOC...] messages

And, there are lots of failure messages in /var/log/kern.log
Feb 23 01:07:16 zd7000 kernel: [ 10.219719] b43: disagrees about version of symbol ssb_device_is_enabled 
etc.

at Feb 23 01:30:40 unloaded b43-pci-bridge and then loaded b43
> sudo modprobe -r b43
and, the b43-pci-bridge driver is gone
> sudo modprobe b43
> sudo ifup wlan0

and, there are no error messages in /var/log/kern.log and networking works.

> sudo tail -40 /var/log/kern.log
Feb 23 01:07:37 zd7000 kernel: [ 37.591944] synaptics: using relaxed packet validation 
Feb 23 01:08:22 zd7000 kernel: [   83.220024] b43-phy0: dc775de4
Feb 23 01:08:22 zd7000 kernel: [ 83.285726] ADDRCONF(NETDEV_UP): wlan0: link is not ready Feb 23 01:08:25 zd7000 kernel: [ 85.524678] wlan0: authenticate with 08:86:3b:d6:f5:c8 Feb 23 01:08:25 zd7000 kernel: [ 85.537165] wlan0: send auth to 08:86:3b:d6:f5:c8 (try 1/3) 
Feb 23 01:08:25 zd7000 kernel: [   85.538698] wlan0: authenticated
Feb 23 01:08:25 zd7000 kernel: [ 85.541025] wlan0: associate with 08:86:3b:d6:f5:c8 (try 1/3) Feb 23 01:08:25 zd7000 kernel: [ 85.543648] wlan0: RX AssocResp from 08:86:3b:d6:f5:c8 (capab=0x411 status=0 aid=2) 
Feb 23 01:08:25 zd7000 kernel: [   85.544215] wlan0: associated
Feb 23 01:08:25 zd7000 kernel: [ 85.544267] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready Feb 23 01:08:25 zd7000 kernel: [ 85.886507] padlock: VIA PadLock not detected. Feb 23 01:08:26 zd7000 kernel: [ 86.426030] wlan0: IPv6 duplicate address fe80::290:4bff:fe52:828a detected! Feb 23 01:30:27 zd7000 kernel: [ 1407.875138] wlan0: deauthenticating from 08:86:3b:d6:f5:c8 by local choice (reason=3) Feb 23 01:30:27 zd7000 kernel: [ 1407.909054] cfg80211: Calling CRDA for country: TW Feb 23 01:30:40 zd7000 kernel: [ 1420.841198] b43-pci-bridge 0000:02:03.0: PCI INT A disabled Feb 23 01:30:51 zd7000 kernel: [ 1431.655150] Compat-drivers backport release: compat-drivers-v3.7.6-1 Feb 23 01:30:51 zd7000 kernel: [ 1431.655156] Backport based on linux.git v3.7.6 
Feb 23 01:30:51 zd7000 kernel: [ 1431.655159] compat.git: linux.git
Feb 23 01:30:51 zd7000 kernel: [ 1431.927850] b43-pci-bridge 0000:02:03.0: PCI INT A -> GSI 21 (level, low) -> IRQ 21 Feb 23 01:30:51 zd7000 kernel: [ 1431.927910] ssb: Found chip with id 0x4306, rev 0x03 and package 0x00 Feb 23 01:30:51 zd7000 kernel: [ 1431.927919] ssb: Core 0 found: ChipCommon (cc 0x800, rev 0x04, vendor 0x4243) Feb 23 01:30:51 zd7000 kernel: [ 1431.927930] ssb: Core 1 found: IEEE 802.11 (cc 0x812, rev 0x05, vendor 0x4243) Feb 23 01:30:51 zd7000 kernel: [ 1431.927940] ssb: Core 2 found: PCMCIA (cc 0x80D, rev 0x02, vendor 0x4243) Feb 23 01:30:51 zd7000 kernel: [ 1431.927949] ssb: Core 3 found: V90 (cc 0x807, rev 0x02, vendor 0x4243) Feb 23 01:30:51 zd7000 kernel: [ 1431.927959] ssb: Core 4 found: PCI (cc 0x804, rev 0x09, vendor 0x4243) Feb 23 01:30:51 zd7000 kernel: [ 1431.931928] ssb: Sonics Silicon Backplane found on PCI device 0000:02:03.0 Feb 23 01:30:51 zd7000 kernel: [ 1431.960576] cfg80211: Calling CRDA to update world regulatory domain 
Feb 23 01:30:51 zd7000 kernel: [ 1431.999205] b43-phy0: dc4b9ea4
Feb 23 01:30:51 zd7000 kernel: [ 1432.021018] b43-phy0: dc4b9e50
Feb 23 01:30:51 zd7000 kernel: [ 1432.045117] Broadcom 43xx driver loaded [ Features: PMNLS ] Feb 23 01:30:51 zd7000 kernel: [ 1432.059967] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht' Feb 23 01:30:51 zd7000 kernel: [ 1432.061916] Registered led device: b43-phy0::tx Feb 23 01:30:51 zd7000 kernel: [ 1432.062031] Registered led device: b43-phy0::rx Feb 23 01:30:51 zd7000 kernel: [ 1432.062092] Registered led device: b43-phy0::radio 
Feb 23 01:31:06 zd7000 kernel: [ 1447.112036] b43-phy0: d65bdde4
Feb 23 01:31:06 zd7000 kernel: [ 1447.165333] ADDRCONF(NETDEV_UP): wlan0: link is not ready Feb 23 01:31:08 zd7000 kernel: [ 1449.340699] wlan0: authenticate with 08:86:3b:d6:f5:c8 Feb 23 01:31:08 zd7000 kernel: [ 1449.353178] wlan0: send auth to 08:86:3b:d6:f5:c8 (try 1/3) 
Feb 23 01:31:08 zd7000 kernel: [ 1449.354793] wlan0: authenticated
Feb 23 01:31:08 zd7000 kernel: [ 1449.360026] wlan0: associate with 08:86:3b:d6:f5:c8 (try 1/3) Feb 23 01:31:08 zd7000 kernel: [ 1449.362396] wlan0: RX AssocResp from 08:86:3b:d6:f5:c8 (capab=0x411 status=0 aid=2) 
Feb 23 01:31:08 zd7000 kernel: [ 1449.362961] wlan0: associated
Feb 23 01:31:08 zd7000 kernel: [ 1449.363010] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready Feb 23 01:31:09 zd7000 kernel: [ 1450.154186] wlan0: IPv6 duplicate address fe80::290:4bff:fe52:828a detected!
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