Re: [BUG] fs/super: a possible sleep-in-atomic bug in put_super

Michal Hocko
2017-10-06T09:06:10Z

[CC Vladimir]

On Fri 06-10-17 16:59:18, Jia-Ju Bai wrote:
> According to fs/super.c, the kernel may sleep under a spinlock.
> The function call path is:
> put_super (acquire the spinlock)
> __put_super
> destroy_super
> list_lru_destroy
> list_lru_unregister
> mutex_lock --> may sleep
> memcg_get_cache_ids
> down_read --> may sleep
>
> This bug is found by my static analysis tool and my code review.
>
> Thanks,
> Jia-Ju Bai

--
Michal Hocko
SUSE Labs