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From: Ming Lei <ming.lei@redhat.com>
To: Stephen Rust <srust@blockbridge.com>
Cc: 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
Subject: Re: Data corruption in kernel 5.1+ with iSER attached ramdisk
Date: Tue, 3 Dec 2019 12:15:04 +0800
Message-ID: <20191203041504.GC6245@ming.t460p> (raw)
In-Reply-To: <CAAFE1besnb=HV4C_buORYpWbkXecmtybwX8d_Ka2NsKmiym53w@mail.gmail.com>

On Mon, Dec 02, 2019 at 10:26:28PM -0500, Stephen Rust wrote:
> > oops, it should have been (arg4 & 511) != 0.
> 
> Yep, there they are:
> 
> # /usr/share/bcc/tools/trace -K 'bio_add_page ((arg4 & 511) != 0) "%d
> %d", arg3, arg4'
> PID     TID     COMM            FUNC             -
> 7411    7411    kworker/31:1H   bio_add_page     512 76
>         bio_add_page+0x1 [kernel]
>         sbc_execute_rw+0x28 [kernel]
>         __target_execute_cmd+0x2e [kernel]
>         target_execute_cmd+0x1c1 [kernel]
>         iscsit_execute_cmd+0x1e7 [kernel]
>         iscsit_sequence_cmd+0xdc [kernel]
>         isert_recv_done+0x780 [kernel]
>         __ib_process_cq+0x78 [kernel]
>         ib_cq_poll_work+0x29 [kernel]
>         process_one_work+0x179 [kernel]
>         worker_thread+0x4f [kernel]
>         kthread+0x105 [kernel]
>         ret_from_fork+0x1f [kernel]
> 
> 7753    7753    kworker/26:1H   bio_add_page     4096 76

The issue should be in brd_make_request() which assumes that
bvec.bv_len is 512bytes align.

I will figure out one patch for you tomorrow.

Thanks,
Ming


      parent reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CAAFE1bd9wuuobpe4VK7Ty175j7mWT+kRmHCNhVD+6R8MWEAqmw@mail.gmail.com>
2019-11-28  1:57 ` 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
2019-12-04  2:39                           ` Ming Lei
2019-12-03  4:15                     ` Ming Lei [this message]

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