From: David Howells <dhowells@redhat.com>
To: Tom Talpey <tom@talpey.com>
Cc: dhowells@redhat.com, Steve French <sfrench@samba.org>,
Shyam Prasad N <nspmangalore@gmail.com>,
Rohith Surabattula <rohiths.msft@gmail.com>,
Long Li <longli@microsoft.com>,
Namjae Jeon <linkinjeon@kernel.org>,
Stefan Metzmacher <metze@samba.org>,
Jeff Layton <jlayton@kernel.org>,
linux-cifs@vger.kernel.org
Subject: Re: [PATCH] cifs: Fix oops due to uncleared server->smbd_conn in reconnect
Date: Thu, 26 Jan 2023 15:20:23 +0000 [thread overview]
Message-ID: <2861100.1674746423@warthog.procyon.org.uk> (raw)
In-Reply-To: <0d4d0b2f-bb2b-a69b-2009-8c883119c10d@talpey.com>
[-- Attachment #1: Type: text/plain, Size: 947 bytes --]
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 --]
[-- Type: application/gzip, Size: 7196 bytes --]
[-- Attachment #3: Server dmesg log --]
[-- Type: application/gzip, Size: 4350 bytes --]
[-- Attachment #4: Server packet capture --]
[-- Type: application/gzip, Size: 9728 bytes --]
next prev parent reply other threads:[~2023-01-26 15:22 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-24 17:48 cifs-rdma: KASAN-detected UAF when using rxe driver David Howells
2023-01-25 7:48 ` David Howells
2023-01-25 14:02 ` [PATCH] cifs: Fix oops due to uncleared server->smbd_conn in reconnect David Howells
2023-01-25 14:47 ` Tom Talpey
2023-01-25 15:52 ` Tom Talpey
2023-01-25 16:20 ` Steve French
2023-01-25 20:41 ` David Howells
2023-01-25 22:24 ` Tom Talpey
2023-01-25 22:43 ` David Howells
2023-01-25 22:56 ` Tom Talpey
2023-01-25 23:42 ` Namjae Jeon
2023-01-26 14:42 ` pcap of misbehaving fallocate over cifs rdma David Howells
2023-01-26 19:54 ` David Howells
2023-01-26 20:29 ` Tom Talpey
2023-01-26 20:47 ` David Howells
2023-01-26 15:20 ` David Howells [this message]
2023-01-26 19:22 ` [PATCH] cifs: Fix oops due to uncleared server->smbd_conn in reconnect Tom Talpey
2023-01-26 19:49 ` David Howells
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