Re: Possible process deadlock in RMPP flow

From: Hal Rosenstock <hal.rosenstock-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Sean Hefty <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: Linux RDMA list
	<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	ewg <ewg-ZwoEplunGu1OwGhvXhtEPSCwEArCW2h5@public.gmane.org>,
	general-list
	<general-ZwoEplunGu1OwGhvXhtEPSCwEArCW2h5@public.gmane.org>
Subject: Re: Possible process deadlock in RMPP flow
Date: Wed, 23 Sep 2009 12:20:48 -0400	[thread overview]
Message-ID: <f0e08f230909230920l410e3cedm58667d1f6958537b@mail.gmail.com> (raw)
In-Reply-To: <7A32EEE20DF5432CADB60B8F8B1E0093-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>

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On Wed, Sep 23, 2009 at 12:08 PM, Sean Hefty <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org> wrote:

> >ibnetdiscover D ffffffff80149b8d     0 26968  26544
> >(L-TLB)
> > ffff8102c900bd88 0000000000000046 ffff81037e8e0000 ffff81037e8e02e8
> > ffff8102c900bd78 000000000000000a ffff8102c5b50820 ffff81038a929820
> > 0000011837bf6105 0000000000000ede ffff8102c5b50a08 0000000100000000
> >Call Trace:
> > [<ffffffff80064207>] wait_for_completion+0x79/0xa2
> > [<ffffffff8008b4cc>] default_wake_function+0x0/0xe
> > [<ffffffff882271d9>] :ib_mad:ib_cancel_rmpp_recvs+0x87/0xde
> > [<ffffffff88224485>] :ib_mad:ib_unregister_mad_agent+0x30d/0x424
> > [<ffffffff883983e9>] :ib_umad:ib_umad_close+0x9d/0xd6
> > [<ffffffff80012e22>] __fput+0xae/0x198
> > [<ffffffff80023de6>] filp_close+0x5c/0x64
> > [<ffffffff800393df>] put_files_struct+0x63/0xae
> > [<ffffffff80015b26>] do_exit+0x31c/0x911
> > [<ffffffff8004971a>] cpuset_exit+0x0/0x6c
> > [<ffffffff8005e116>] system_call+0x7e/0x83
> >
> >From the dump it seems that the process is waits on the call to
> >flush_workqueue() in ib_cancel_rmpp_recvs(). The package they use is
> >OFED 1.4.2.
>
> Roland just submitted a patch in this area yesterday.  I don't know if the
> patch
> would fix their issue, but it may be worth trying.  What kernel does 1.4.2
> map
> to?
>
> What RMPP messages does ibnetdiscover use?

None AFAIK.

-- Hal

>   If the program is completing
> successfully, there may be a different race with the rmpp cleanup.  I'll
> see if
> anything else stands out in that area.
>
> - Sean
>
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