From: Stephen Rust <srust@blockbridge.com>
To: Sagi Grimberg <sagi@grimberg.me>
Cc: Ming Lei <ming.lei@redhat.com>,
Rob Townley <rob.townley@gmail.com>,
Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, linux-rdma@vger.kernel.org,
linux-scsi@vger.kernel.org, martin.petersen@oracle.com,
target-devel@vger.kernel.org, Doug Ledford <dledford@redhat.com>,
Jason Gunthorpe <jgg@ziepe.ca>, Max Gurtovoy <maxg@mellanox.com>
Subject: Re: Data corruption in kernel 5.1+ with iSER attached ramdisk
Date: Thu, 5 Dec 2019 09:36:25 -0500 [thread overview]
Message-ID: <CAAFE1bcgKAuzmE+eYXvcj6y4SykoaWfXgzR+f2N73K_2RfZ6LA@mail.gmail.com> (raw)
In-Reply-To: <d9d39d10-d3f3-f2d8-b32e-96896ba0cdb2@grimberg.me>
Hi Sagi,
On Thu, Dec 5, 2019 at 4:17 AM Sagi Grimberg <sagi@grimberg.me> wrote:
>
> Just got this one (Thanks for CCing me Ming, been extremely busy
> lately).
No problem, thanks for looking into it!
> So it looks from the report that this is the immediate-data and
> unsolicited data-out flows, which indeed seem to violate the alignment
> assumption. The reason is that isert post recv a contig rx_desc which
> has both the headers and the data, and when it gets immediate_data it
> will set the data sg to rx_desc+offset (which are the headers).
>
> Stephen,
> As a work-around for now, you should turn off immediate-data in your LIO
> target. I'll work on a fix.
I have confirmed that turning off ImmediateData in the target (and
reconnecting) is a successful workaround for this test case. All of
the I/O as reported by bio_add_page() is aligned.
Using the previously described bpftrace script with 512 offset:
# bpftrace lio.bt
Attaching 4 probes...
512 0
512 0 1 131071
4096 0
4096 0 0 0
4096 0
4096 0 0 8
4096 0
4096 0 0 131064
4096 0
4096 0 1 131064
4096 0
4096 0 0 0
4096 0
4096 0 0 8
512 0
512 0 0 131071
4096 0
4096 0 0 130944
4096 0
4096 0 0 131056
> Thanks for reporting!
Please let me know if you need any additional information, or if I can
assist further. I would be happy to test any patches when you are
ready.
Thanks,
Steve
next prev parent reply other threads:[~2019-12-05 14:36 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAAFE1bd9wuuobpe4VK7Ty175j7mWT+kRmHCNhVD+6R8MWEAqmw@mail.gmail.com>
2019-11-28 1:57 ` Data corruption in kernel 5.1+ with iSER attached ramdisk Ming Lei
[not found] ` <CA+VdTb_-CGaPjKUQteKVFSGqDz-5o-tuRRkJYqt8B9iOQypiwQ@mail.gmail.com>
2019-11-28 2:58 ` Ming Lei
[not found] ` <CAAFE1bfsXsKGyw7SU_z4NanT+wmtuJT=XejBYbHHMCDQwm73sw@mail.gmail.com>
2019-11-28 4:25 ` Stephen Rust
2019-11-28 5:51 ` Rob Townley
2019-11-28 9:12 ` Ming Lei
2019-12-02 18:42 ` Stephen Rust
2019-12-03 0:58 ` Ming Lei
2019-12-03 3:04 ` Stephen Rust
2019-12-03 3:14 ` Ming Lei
2019-12-03 3:26 ` Stephen Rust
2019-12-03 3:50 ` Stephen Rust
2019-12-03 12:45 ` Ming Lei
2019-12-03 19:56 ` Stephen Rust
2019-12-04 1:05 ` Ming Lei
2019-12-04 17:23 ` Stephen Rust
2019-12-04 23:02 ` Ming Lei
2019-12-05 0:16 ` Bart Van Assche
2019-12-05 14:44 ` Stephen Rust
2019-12-05 2:28 ` Stephen Rust
2019-12-05 3:05 ` Ming Lei
2019-12-05 9:17 ` Sagi Grimberg
2019-12-05 14:36 ` Stephen Rust [this message]
[not found] ` <CAAFE1beqFBQS_zVYEXFTD2qu8PAF9hBSW4j1k9ZD6MhU_gWg5Q@mail.gmail.com>
2020-03-25 0:15 ` Sagi Grimberg
2020-03-30 17:08 ` Stephen Rust
2020-03-31 1:07 ` Sagi Grimberg
2020-04-01 0:38 ` Sagi Grimberg
2020-04-02 20:03 ` Stephen Rust
2020-04-02 22:16 ` Sagi Grimberg
2019-12-04 2:39 ` Ming Lei
2019-12-03 4:15 ` Ming Lei
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