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From: swise@opengridcomputing.com (Steve Wise)
Subject: nvme_rdma - leaves provider resources allocated
Date: Tue, 23 Aug 2016 11:58:56 -0500	[thread overview]
Message-ID: <014301d1fd5f$a2da7000$e88f5000$@opengridcomputing.com> (raw)

Assume an nvme_rdma host has one attached controller in RECONNECTING state, and
that controller has failed to reconnect at least once and thus is in the
delay_schedule time before retrying the connection.  At that moment, there are
no cm_ids allocated for that controller because the admin queue and the io
queues have been freed.  So nvme_rdma cannot get a DEVICE_REMOVAL from the
rdma_cm.  This means if the underlying provider module is removed, it will be
removed with resources still allocated by nvme_rdma.  For iw_cxgb4, this causes
a BUG_ON() in gen_pool_destroy() because MRs are still allocated for the
controller.

Thoughts on how to fix this?

Thanks,

Steve.

             reply	other threads:[~2016-08-23 16:58 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-08-23 16:58 Steve Wise [this message]
2016-08-24  9:31 ` nvme_rdma - leaves provider resources allocated Sagi Grimberg
2016-08-24 14:09   ` Steve Wise
2016-08-25 21:52     ` Sagi Grimberg
2016-08-25 22:03       ` Steve Wise
2016-08-25 22:06         ` Sagi Grimberg

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