Re: [PATCH 1/1] block: CFQ refcounting fix

[Jens Axboe <axboe@suse.de>]

On Tue, Aug 30 2005, brking@us.ibm.com wrote:
> 
> I ran across a memory leak related to the cfq scheduler. The cfq
> init function increments the refcnt of the associated request_queue.
> This refcount gets decremented in cfq's exit function. Since blk_cleanup_queue
> only calls the elevator exit function when its refcnt goes to zero, the
> request_q never gets cleaned up. It didn't look like other io schedulers were
> incrementing this refcnt, so I removed the refcnt increment and it fixed the
> memory leak for me.
> 
> To reproduce the problem, simply use cfq and use the scsi_host scan sysfs
> attribute to scan "- - -" repeatedly on a scsi host and watch the memory
> vanish.

Yeah, that actually looks like a dangling reference. I assume you tested
this properly?

-- 
Jens Axboe