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From: "Bernard Metzler" <BMT@zurich.ibm.com>
To: "Bart Van Assche" <bvanassche@acm.org>
Cc: linux-rdma@vger.kernel.org, "Jason Gunthorpe" <jgg@nvidia.com>
Subject: Re: v5.15-rc1 issue with the soft-iWARP driver
Date: Thu, 16 Sep 2021 19:18:55 +0000	[thread overview]
Message-ID: <OF74B9ECF6.B2B7F2D4-ON00258752.00675A19-00258752.006A1A3D@ibm.com> (raw)
In-Reply-To: <ccb9ee03-4aaa-2288-3d2f-ce01f550a609@acm.org>

-----"Bart Van Assche" <bvanassche@acm.org> wrote: -----

>To: linux-rdma@vger.kernel.org, "Jason Gunthorpe" <jgg@nvidia.com>
>From: "Bart Van Assche" <bvanassche@acm.org>
>Date: 09/15/2021 06:54AM
>Subject: [EXTERNAL] v5.15-rc1 issue with the soft-iWARP driver
>
>Hi,
>
>If I run test srp/015 from the blktests suite then the following
>appears
>in the kernel log:
>
>==================================================================
>BUG: KASAN: null-ptr-deref in __list_del_entry_valid+0x4d/0xe0
>Read of size 8 at addr 0000000000000000 by task kworker/u16:3/161
>
>CPU: 5 PID: 161 Comm: kworker/u16:3 Not tainted 5.15.0-rc1-dbg+ #2
>Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
>rel-1.14.0-0-g155821a-rebuilt.opensuse.org 04/01/2014
>Workqueue: iw_cm_wq cm_work_handler [iw_cm]
>Call Trace:
>  show_stack+0x52/0x58
>  dump_stack_lvl+0x5b/0x82
>  kasan_report.cold+0x52/0x57
>  __asan_load8+0x69/0x90
>  __list_del_entry_valid+0x4d/0xe0
>  _cma_cancel_listens+0x49/0x230 [rdma_cm]
>  _destroy_id+0x4e/0x420 [rdma_cm]
>  destroy_id_handler_unlock+0xc4/0x200 [rdma_cm]
>  iw_conn_req_handler+0x335/0x370 [rdma_cm]
>  cm_conn_req_handler+0x546/0x7d0 [iw_cm]
>  cm_work_handler+0x419/0x480 [iw_cm]
>  process_one_work+0x59d/0xb00
>  worker_thread+0x8f/0x5c0
>  kthread+0x1fc/0x230
>  ret_from_fork+0x1f/0x30
>==================================================================
>
>I think this is a regression. This happened with commit a17a1faf5d3e
>("RDMA/cma: Fix listener leak in rdma_cma_listen_on_all() failure").
>
So far I could not reproduce it with that patch (tried to get better
understanding with siw debugging enabled). That doesn't mean much.

But I do see issues with rxe if running the complete srp set from
blktest, which seem to be unrelated. I'll send an extra message.

Many thanks,
Bernard.

      parent reply	other threads:[~2021-09-16 19:19 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-15  4:54 Bart Van Assche
2021-09-15 14:34 ` Jason Gunthorpe
2021-09-16 19:18 ` Bernard Metzler [this message]

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