[BUG] act_ife: sleeping functions called in atomic context

From	Alexey Khoroshilov <khoroshilov@ispras.ru>
Newsgroups	linux.kernel
Subject	[BUG] act_ife: sleeping functions called in atomic context
Date	2016-06-16 23:00 +0200
Message-ID	<rKMym-4B7-3@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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tcf_ife_init() contains a big chunk of code executed with
ife->tcf_lock spinlock held. But that code contains several calls
to sleeping functions:
  populate_metalist() and use_all_metadata()
    -> add_metainfo()
      -> find_ife_oplist(metaid)
        -> read_lock()
        -> try_module_get(o->owner)
      -> kzalloc(sizeof(*mi), GFP_KERNEL);
      -> ops->alloc(mi, metaval);
      -> module_put(ops->owner);
  _tcf_ife_cleanup()
    -> module_put()

The same problem is actual for tcf_ife_cleanup() as well.

Found by Linux Driver Verification project (linuxtesting.org).

--
Alexey Khoroshilov
Linux Verification Center, ISPRAS
web: http://linuxtesting.org

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[BUG] act_ife: sleeping functions called in atomic context Alexey Khoroshilov <khoroshilov@ispras.ru> - 2016-06-16 23:00 +0200
  Re: [BUG] act_ife: sleeping functions called in atomic context Cong Wang <xiyou.wangcong@gmail.com> - 2016-06-16 23:50 +0200
    Re: [BUG] act_ife: sleeping functions called in atomic context Jamal Hadi Salim <jhs@mojatatu.com> - 2016-06-17 02:40 +0200
      Re: [BUG] act_ife: sleeping functions called in atomic context Cong Wang <xiyou.wangcong@gmail.com> - 2016-06-17 04:20 +0200
        Re: [BUG] act_ife: sleeping functions called in atomic context Cong Wang <xiyou.wangcong@gmail.com> - 2016-06-17 07:40 +0200
          Re: [BUG] act_ife: sleeping functions called in atomic context Alexey Khoroshilov <khoroshilov@ispras.ru> - 2016-06-17 13:10 +0200
            Re: [BUG] act_ife: sleeping functions called in atomic context Cong Wang <xiyou.wangcong@gmail.com> - 2016-06-17 19:20 +0200
          Re: [BUG] act_ife: sleeping functions called in atomic context Jamal Hadi Salim <jhs@mojatatu.com> - 2016-06-17 13:10 +0200
            Re: [BUG] act_ife: sleeping functions called in atomic context Cong Wang <xiyou.wangcong@gmail.com> - 2016-06-17 19:40 +0200
              Re: [BUG] act_ife: sleeping functions called in atomic context Jamal Hadi Salim <jhs@mojatatu.com> - 2016-06-18 16:50 +0200

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