From: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
To: Jason Gunthorpe <jgg@nvidia.com>,
Danil Kipnis <danil.kipnis@cloud.ionos.com>,
Doug Ledford <dledford@redhat.com>,
Christoph Hellwig <hch@lst.de>,
Jack Wang <jinpu.wang@cloud.ionos.com>,
Keith Busch <kbusch@kernel.org>,
linux-nvme@lists.infradead.org, linux-rdma@vger.kernel.org,
Max Gurtovoy <mgurtovoy@nvidia.com>,
netdev@vger.kernel.org, rds-devel@oss.oracle.com,
Sagi Grimberg <sagi@grimberg.me>,
Santosh Shilimkar <santosh.shilimkar@oracle.com>
Cc: Leon Romanovsky <leonro@nvidia.com>
Subject: Re: [PATCH] RDMA: Add rdma_connect_locked()
Date: Tue, 27 Oct 2020 13:05:00 +0100 [thread overview]
Message-ID: <11bb18bd-a26a-d0e2-9ff6-6d7e2bf3fb86@cloud.ionos.com> (raw)
In-Reply-To: <0-v1-75e124dbad74+b05-rdma_connect_locking_jgg@nvidia.com>
On 10/26/20 15:25, Jason Gunthorpe wrote:
> There are two flows for handling RDMA_CM_EVENT_ROUTE_RESOLVED, either the
> handler triggers a completion and another thread does rdma_connect() or
> the handler directly calls rdma_connect().
>
> In all cases rdma_connect() needs to hold the handler_mutex, but when
> handler's are invoked this is already held by the core code. This causes
> ULPs using the 2nd method to deadlock.
>
> Provide a rdma_connect_locked() and have all ULPs call it from their
> handlers.
>
> Reported-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
> Fixes: 2a7cec538169 ("RDMA/cma: Fix locking for the RDMA_CM_CONNECT state"
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> ---
> drivers/infiniband/core/cma.c | 39 +++++++++++++++++++++---
> drivers/infiniband/ulp/iser/iser_verbs.c | 2 +-
> drivers/infiniband/ulp/rtrs/rtrs-clt.c | 4 +--
> drivers/nvme/host/rdma.c | 10 +++---
> include/rdma/rdma_cm.h | 13 +-------
> net/rds/ib_cm.c | 5 +--
> 6 files changed, 47 insertions(+), 26 deletions(-)
>
> Seems people are not testing these four ULPs against rdma-next.. Here is a
> quick fix for the issue:
>
> https://lore.kernel.org/r/3b1f7767-98e2-93e0-b718-16d1c5346140@cloud.ionos.com
I can't see the previous calltrace with this patch.
Tested-by: Guoqing Jiang<guoqing.jiang@cloud.ionos.com>
Thanks,
Guoqing
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prev parent reply other threads:[~2020-10-27 12:05 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-26 14:25 [PATCH] RDMA: Add rdma_connect_locked() Jason Gunthorpe
2020-10-26 16:01 ` santosh.shilimkar
2020-10-27 2:01 ` Chao Leng
2020-10-27 12:00 ` Jason Gunthorpe
2020-10-27 7:33 ` Jinpu Wang
2020-10-27 8:04 ` Christoph Hellwig
2020-10-27 12:05 ` Guoqing Jiang [this message]
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