Subject: Re: more funky stuff with kthreads and interrupts
To: Toru Nishimura <>
From: Hubert Feyrer <>
List: tech-kern
Date: 05/08/2001 13:51:41
[moved to tech-kern]

On Tue, 8 May 2001, Toru Nishimura wrote:
> I thought NetBSD/mips was immune from it as pcb0 was forced to have
> spl0 condition which was propagated to all of children, but it was a
> wrong fix.  The issue is pcb0 gets overwritten before the first
> kthread_create1() is called.  For a normal process which has user mode
> it doesn't matter because proc_trampoline() makes the process to have
> spl0 during exception return path to user mode, however, kthreads stay
> in kernel mode mistakenly left in splhigh condition.
> /// FIX ///
> Make sure to have spl0 condition whenever a new thread of control
> is created.

Would it make sense to check that in the the thread create function (I
forgot what it's called)?

 - Hubert

Hubert Feyrer <>