New: iSCSI initiator: mkfs.ext4 + mount triggers kernel oops

https://bugzilla.kernel.org/show_bug.cgi?id=193041

            Bug ID: 193041
           Summary: iSCSI initiator: mkfs.ext4 + mount triggers kernel
                    oops
           Product: IO/Storage
           Version: 2.5
    Kernel Version: v4.10-rc4
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: SCSI
          Assignee: [email protected]
          Reporter: [email protected]
        Regression: No

Created attachment 252661
--> https://bugzilla.kernel.org/attachment.cgi?id=252661&action=edit
netconsole output

The following command sequence worked with previous kernels but triggers a kernel oops with kernel v4.10-rc4:

./restart-lio-iscsi
iscsiadm -m discovery -t st -p localhost
iscsiadm -m node -p localhost -l
mkfs.ext4 /dev/sda
mount /dev/sda /mnt

gdb translates the crash address into the following:

$ gdb ./drivers/scsi/iscsi_tcp.ko
(gdb) list *(iscsi_sw_tcp_xmit_segment+0x84)
0xf54 is in iscsi_sw_tcp_xmit_segment (drivers/scsi/iscsi_tcp.c:272).
267             struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
268             struct socket *sk = tcp_sw_conn->sock;
269             unsigned int copied = 0;
270             int r = 0;
271
272             while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) {
273                     struct scatterlist *sg;
274                     unsigned int offset, copy;
275                     int flags = 0;
276

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https://bugzilla.kernel.org/show_bug.cgi?id=193041

Bart Van Assche <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------

             Status|NEW                         |RESOLVED
         Resolution|---                         |CODE_FIX

--- Comment #1 from Bart Van Assche <[email protected]> --- Fixed in v4.10-rc6 by commit 08965c2eba135bdfb6e86cf25308e01421c7e0ce (Revert "sd: remove __data_len hack for WRITE SAME").

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