On Mon, May 06, 2002 at 03:53:27PM +0900, [EMAIL PROTECTED] wrote:
> I've been struggling upgrading kernel since beginning of April, and finally
> found I have to add "options LOOKUP_EXCLUSIVE" to my kernel config file.
> Without LOOKUP_EXCLUSIVE,
> - some of the processes stall in "inode" state, and can't be killed
> by any signals
> - shutting down(and maybe unmounting) the system results in the panic:
> lockmgr: upgrade exclusive lock
> The stalling processes are all touching files under nullfs-mounted
> directories, so I think nullfs code is not yet LOOKUP_SHARED-safe.
> If anyone is interested, I can post the backtrace and my kernel config
> (after upgrading the world and rebuilding the panicking kernel).
If you're feeling experimental try the change in PR kern/37270. It
makes nullfs partially safe w.r.t. LOOKUP_SHARED, although there
are still easily reproducable deadlocks (possible interactions with
the syncer and/or vnlru processes but nothing concrete; at least,
not from me).
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