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Date:   Tue, 21 Dec 2021 12:26:08 +0200
From:   Leon Romanovsky <leon@kernel.org>
To:     Karsten Graul <kgraul@linux.ibm.com>
Cc:     Tony Lu <tonylu@linux.alibaba.com>, Alaa Hleihel <alaa@nvidia.com>,
        Jason Gunthorpe <jgg@ziepe.ca>, linux-rdma@vger.kernel.org
Subject: Re: RDMA/mlx5: Regression since v5.15-rc5: Kernel panic when called
 ib_dereg_mr
Message-ID: <YcGrwF3xQOh2o0rp@unreal>
References: <9974ea8c-f1cb-aeb4-cf1b-19d37536894a@linux.alibaba.com>
 <8b764027-4f25-e27d-15f9-7466343cf845@linux.ibm.com>
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On Tue, Dec 21, 2021 at 09:20:28AM +0100, Karsten Graul wrote:
> On 21/12/2021 09:04, Tony Lu wrote:
> > Hello,
> > 
> > During developing and testing of SMC (net/smc), We found a problem,
> > when SMC released linkgroup or link, it called ib_dereg_mr to release
> > resources, then it panicked in mlx5_ib_dereg_mr. After investigation,
> > we found this panic was introduce by this commit:
> > 
> >     f0ae4afe3d35 ("RDMA/mlx5: Fix releasing unallocated memory in dereg MR flow")
> 
> +1, this panic in our environment:

I assume that this patch will fix.
https://lore.kernel.org/all/f298db4ec5fdf7a2d1d166ca2f66020fd9397e5c.1640079962.git.leonro@nvidia.com

Thanks