[issue1971] panic in lwpsignal

[YONETANI Tomokazu]

> :I started getting this panic recently while under load.  It took me
> :a couple of days to get the kernel dump because it still locks up
> :while dumping.  The line number is slightly off because I inserted
> :a KKASSERT() right before the if statement to validate the array index
> :used in SIGISMEMBER() macro.
				:
>     I'm guessing this is a mplock vs proc_token issue or other blocking
>     issue.  Lets do this patch to start with, but it is also possible
>     that we might have to hold proc_token... that the exit1() code's
>     use of the mplock (mp_token now) is not sufficient.
> 
> 	fetch http://apollo.backplane.com/DFlyMisc/exit01.patch
> 
> 						-Matt

Hi,

I've applied this patch and restarted the system with the new kernel
about 13 hours ago.  It's still running happily, but it probably needs
another half a day or so before I can say `it seems to be fixed.'

Thanks.