This is a note to let you know that I've just added the patch titled
iscsi-target: make sure to wake up sleeping login worker
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iscsi-target-make-sure-to-wake-up-sleeping-login-worker.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1c130ae00b769a2e2df41bad3d6051ee8234b636 Mon Sep 17 00:00:00 2001
From: Florian Westphal <fw@xxxxxxxxx>
Date: Fri, 19 Jan 2018 14:36:29 +0100
Subject: iscsi-target: make sure to wake up sleeping login worker
From: Florian Westphal <fw@xxxxxxxxx>
commit 1c130ae00b769a2e2df41bad3d6051ee8234b636 upstream.
Mike Christie reports:
Starting in 4.14 iscsi logins will fail around 50% of the time.
Problem appears to be that iscsi_target_sk_data_ready() callback may
return without doing anything in case it finds the login work queue
is still blocked in sock_recvmsg().
Nicholas Bellinger says:
It would indicate users providing their own ->sk_data_ready() callback
must be responsible for waking up a kthread context blocked on
sock_recvmsg(..., MSG_WAITALL), when a second ->sk_data_ready() is
received before the first sock_recvmsg(..., MSG_WAITALL) completes.
So, do this and invoke the original data_ready() callback -- in
case of tcp sockets this takes care of waking the thread.
Disclaimer: I do not understand why this problem did not show up before
tcp prequeue removal.
(Drop WARN_ON usage - nab)
Reported-by: Mike Christie <mchristi@xxxxxxxxxx>
Bisected-by: Mike Christie <mchristi@xxxxxxxxxx>
Tested-by: Mike Christie <mchristi@xxxxxxxxxx>
Diagnosed-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Fixes: e7942d0633c4 ("tcp: remove prequeue support")
Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # 4.14+
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/target/iscsi/iscsi_target_nego.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/target/iscsi/iscsi_target_nego.c
+++ b/drivers/target/iscsi/iscsi_target_nego.c
@@ -432,6 +432,9 @@ static void iscsi_target_sk_data_ready(s
if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
write_unlock_bh(&sk->sk_callback_lock);
pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn);
+ if (iscsi_target_sk_data_ready == conn->orig_data_ready)
+ return;
+ conn->orig_data_ready(sk);
return;
}
Patches currently in stable-queue which might be from fw@xxxxxxxxx are
queue-4.15/iscsi-target-make-sure-to-wake-up-sleeping-login-worker.patch