On Fri, 2003-11-28 at 01:02, Don Lewis wrote: > On 27 Nov, Stefan Ehmann wrote: > > On Wed, 2003-11-26 at 08:33, Don Lewis wrote: > >> The problem is that selrecord() wants to lock a MTX_DEF mutex, which can > >> cause a context switch if the mutex is already locked by another thread. > >> This is contrary to what bktr_poll() wants to accomplish by calling > >> critical_enter(). > > > > Strange enough that does not seem to happen with a kernel built without > > INVARIANTS and WITNESS. Does this make any sense or is this just by > > chance? > > You might try the patch below with WITNESS enabled. I don't have the > hardware, so I can't test it. It compiles for me, but for all I know it > could delete all your files if you run it.
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