kernel panic when removing a running script directly

[Martin Hunt]

On Thu, 2007-10-25 at 14:50 -0400, Masami Hiramatsu wrote:
> Hello Martin,
> 
> I've gotten kernel panic when removing a running script (which is detached
> from staprun) directly using rmmod command.
> I hit it on Fedora7(2.6.22.9-91.fc7)@i386 and Fedora8test3(2.6.23.1-30.fc8)@x86-64
> with latest systemtap on CVS.
> 
> Here is what I did:
> $ stap -m iotime examples/iotime.stp
> ^4 (send SIGQUIT)
> $ /sbin/rmmod iotime
> 
> This bug sometimes did not occur, so you might need to repeat it.
> And I could not reproduce it on RHEL5.

I wrote a script to repeat the above process hundreds of times per
second and was able to reproduce on all systems I tried. I have checked
in a fix.  Please update from CVS and confirm it works for you.

Thanks for reporting this.

Martin