kern/128870: Interrupt Storm when plugging in PCMCIA Card (HP NC8000 Notebook)

Andreas Wehrmann a_wehrmann at
Fri Nov 14 07:10:02 PST 2008

>Number:         128870
>Category:       kern
>Synopsis:       Interrupt Storm when plugging in PCMCIA Card (HP NC8000 Notebook)
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Nov 14 15:10:02 UTC 2008
>Originator:     Andreas Wehrmann
>Release:        7.0-p5
FreeBSD hostname 7.0-RELEASE-p5 FreeBSD 7.0-RELEASE-p5 #0: Wed Oct  1 10:10:12 UTC 2008     root at  i386
All this is happening on a HP NC8000 Laptop.
I tried to configure my PCMCIA WLAN Card (Allnet ALL0282A; AR5211 chip) recently. First thing I wanted to do is to scan for networks, so I set the card "up" and noticed a lot of Interrupt storm warnings on the console:

interrupt storm detected on "irq10:"; throttling interrupt source

The network scan didn't succeed btw.
I tried another WLAN Card: Conceptronic C54RC (Version 2.0) R61 chip but the exact same thing happened again. I then tried a serial card (PCMCIA card that offers a COM-Port) and when booting up, I got those storms as well.

I used the following command to determine, which driver handles IRQ10: "ps ax | grep irq".

The following showed up:
   22  ??  WL     0:00.57 [irq10: cbb0 cbb1+*]

Therefore I suppose there is a bug in the interrupt handling in the cbb driver, because all these card work (on the same machine) under Linux and Windows XP.
Plug in some PCMCIA Card.


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