Re: [PATCH v2 02/10] zram: avoid invalid memory access in zram_exit()

From: Minchan Kim
Date: Wed Jun 05 2013 - 02:04:51 EST

On Wed, Jun 05, 2013 at 12:06:00AM +0800, Jiang Liu wrote:
> Memory for zram->disk object may have already been freed after returning
> from destroy_device(zram), then it's unsafe for zram_reset_device(zram)
> to access zram->disk again.
> We can't solve this bug by flipping the order of destroy_device(zram)
> and zram_reset_device(zram), that will cause deadlock issues to the
> zram sysfs handler.

What kinds of deadlock happen?
Could you elaborate it more?

Kind regards,
Minchan Kim
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