linux-kernel - RE: WARNING: bad unlock balance in ucma_event

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Date:   Mon, 10 Jun 2019 19:58:27 +0000
From:   "Hefty, Sean" <sean.hefty@...el.com>
To:     Jason Gunthorpe <jgg@...pe.ca>, Eric Biggers <ebiggers@...nel.org>
CC:     syzbot <syzbot+e5579222b6a3edd96522@...kaller.appspotmail.com>,
        "dasaratharaman.chandramouli@...el.com" 
        <dasaratharaman.chandramouli@...el.com>,
        "dledford@...hat.com" <dledford@...hat.com>,
        "leon@...nel.org" <leon@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "parav@...lanox.com" <parav@...lanox.com>,
        "roland@...estorage.com" <roland@...estorage.com>,
        "syzkaller-bugs@...glegroups.com" <syzkaller-bugs@...glegroups.com>
Subject: RE: WARNING: bad unlock balance in ucma_event_handler

> That is as far as I can get, trying to figure out how to rework
> ctx->file to be properly ref counted, accessed and locked, is a major
> task.. I don't even know right now what migrate_id is supposed to be
> for :(

By default, events for a new connection (rdma_cm_id) go to the fd (rdma_cm_event_channel) associated with the listen.  This allows migrating those events to a different fd.

- Sean