Re: [Workqueue] crash in process_one_work

From: Tejun Heo
Date: Wed Oct 08 2014 - 08:15:13 EST

Hello, Arun.

On Wed, Oct 08, 2014 at 05:30:20PM +0530, Arun KS wrote:
> > I sure hope not. How reproducible is the issue? Can you try w/
> Thanks for replying.
> That was a problem with one of our driver. It was freeing the
> memory(struct work) without flushing workqueue.
> We caught faulty driver by adding a BUG_ON() in INIT_WORK and looking
> at the func pointer in work_struct( which will be pointing to the
> faulty driver work function)
> 1) faulty driver queue_work to system_unbownded_wq
> 2) free work_struct memory, but it is still queued in the work queue.
> 3) another driver request the memory from SLAB, go the same memory, it INIT_WORK
> 4) process work try to execute the work queued by the faulty driver,
> result in a crash.

Ah, good to hear. I think bugs like the above should be detectable
with CONFIG_DEBUG_OBJECTS_WORK, so if you see something similar next
time, please try it out.


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