Debug output when wi0 pcccard removed

Reposted from stable mailing list...

Hello, All;

I recently CVSUP'd from 5.4 to 6.0BETA1. I used the instructions in
UPDATING to build/install world and used GENERIC unmodified to build the
kernel. The whole procedure went without a single hitch. My question
concerns the meaning of a debug message which appears when I remove my
Wi-Fi card (which by the way works fine...I'm using it to send this mail).

Here's the output from "dmesg" when I insert the card (just for reference);

wi0: <SMC SMC2532W-B EliteConnect Wireless Adapter> at port 0x100-0x13f
irq 11 function 0 config 1 on pccard1
wi0: using RF:PRISM2.5 MAC:ISL3873
wi0: Intersil Firmware: Primary (1.1.0), Station (1.4.9)
wi0: Ethernet address: 00:04:e2:80:34:be

When I remove the card I get the following;

taskqueue_drain with the following non-sleepable locks held:
exclusive sleep mutex wi0 (network driver) r = 0 (0xc2416afc) locked _at_
/usr/src/sys/dev/wi/if_wi.c:845
KDB: stack backtrace:
kdb_backtrace(1,c1af9250,c1af9000,c1989b80,d44bfc2c) at kdb_backtrace+0x29
witness_warn(5,0,c0854d21,c1af9000,c1af9000) at witness_warn+0x18e
taskqueue_drain(c1989b80,c1af9250,c1af9000,c1af9000,c1af9000) at
taskqueue_drain+0x1a
if_detach(c1af9000,c1af9000) at if_detach+0x1a
ether_ifdetach(c1af9000,0,c2416000,d44bfc94,c05debfc) at ether_ifdetach+0x28
ieee80211_ifdetach(c2416004,c1af9000,c1af9000,0,c1c51880) at
ieee80211_ifdetach+0x50
wi_detach(c1c51880) at wi_detach+0x64
device_detach(c1c51880) at device_detach+0x70
pccard_detach_card(c1aaa600) at pccard_detach_card+0x41
exca_removal(c1a6e804) at exca_removal+0x46
cbb_removal(c1a6e800) at cbb_removal+0x2c
cbb_event_thread(c1a6e800,d44bfd38,c1a6e800,c0579df0,0) at
cbb_event_thread+0x9a
fork_exit(c0579df0,c1a6e800,d44bfd38) at fork_exit+0xa0
fork_trampoline() at fork_trampoline+0x8
--- trap 0x1, eip = 0, esp = 0xd44bfd6c, ebp = 0 ---
wi0: detached

I don't read debug messages yet (just got some tutorials), and am 
wondering if this is a problem, is it just because WITNESS and 
INVARIANTS are enabled, or if it's normal but never seen in a non-debug 
kernel.

I get a similar message when I shutdown, having to do mostly with ACPI,
but since that's been buggy on this machine (Dell Latitude C600), I
almost expected that.

Thanks in advance--

Patrick Bowen
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