Re: [PATCH] cifs: Fix oops due to uncleared server->smbd_conn in reconnect

[David Howells <dhowells@redhat.com>]

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Tom Talpey <tom@talpey.com> wrote:

> Do you have any logging from the softRoCE runs? I'd suspect some
> kind of RDMA-specific scatter/gather overflow which might be
> server-side as easily as client-side.
> 
> On client, try:
>   echo 0x1ff >/sys/module/cifs/parameters/smbd_logging_class
> 
> On server:
>    ksmbd.control -d conn
>    ksmbd.control -d rdma

Okay, on -rc5 without my patches, using:

# rdma link add rxe0 type rxe netdev enp6s0 # andromeda, softRoCE
# mount //192.168.6.1/test /xfstest.test -o user=shares,pass=foobar,rdma
# dd if=/dev/zero of=/xfstest.test/hello2 bs=16k count=1 oflag=direct conv=notrunc seek=2

the dd hangs.  I've captured the client and server logging you requested plus
a pcap file on the server (see attached).

Note also I tried md5summing a 1MiB file and that produced a different MD5 sum
each time.  I couldn't see enough data being transferred in the pcap to
indicate that that was happening.

David


[-- Attachment #2: Client dmesg log --]
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[-- Attachment #3: Server dmesg log --]
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[-- Attachment #4: Server packet capture --]
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