netdev - BUG: nvmet with cxgb4 is broken in v4.12-rc1

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Date:   Wed, 17 May 2017 11:38:46 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Arjun Vynipadath <arjun@...lsio.com>
Cc:     Casey Leedom <leedom@...lsio.com>,
        Ganesh Goudar <ganeshgr@...lsio.com>,
        "David S. Miller" <davem@...emloft.net>,
        Stephen Bates <sbates@...thlin.com>,
        SWise OGC <swise@...ngridcomputing.com>,
        netdev@...r.kernel.org, linux-nvme@...ts.infradead.org,
        Sagi Grimberg <sagi@...mberg.me>
Subject: BUG: nvmet with cxgb4 is broken in v4.12-rc1

Hello,

Another cxgb4 bug report for you. Testing nvmet over our T62100-LP-CR
stopped working in v4.12-rc1. We are seeing two oopses: a general
protection fault in nvmet_rdma_free_rsps and a WQ_MEM_RECLAIM warning.
These occur after a suspect cxgb4 message. Please see the full dmesg log
which is attached.

> [   41.093555] cxgb4 0000:07:00.4: AE qpid 1034 opcode 0 status 0x1 type 1 len 0x0 wrid.hi 0x0 wrid.lo 0x0
> [   41.093673] nvmet_rdma: received IB QP event: QP access error (3)

I've bisected to find this commit is the culprit:

bb58d079: cxgb4: Update IngPad and IngPack values

A bisect log is also attached. Reverting that commit also fixes the issue.

Thanks,

Logan

View attachment "bisect.nvmet1.log" of type "text/x-log" (2866 bytes)

View attachment "dmesg.log" of type "text/x-log" (89642 bytes)