This is a note to let you know that I've just added the patch titled
nvme_fcloop: fix abort race condition
to the 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: nvme_fcloop-fix-abort-race-condition.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@vger.kernel.org know about it.
From foo@baz Mon Apr 9 10:16:32 CEST 2018
From: James Smart jsmart2021@gmail.com Date: Wed, 29 Nov 2017 16:47:30 -0800 Subject: nvme_fcloop: fix abort race condition
From: James Smart jsmart2021@gmail.com
[ Upstream commit 278e096063f1914fccfc77a617be9fc8dbb31b0e ]
A test case revealed a race condition of an i/o completing on a thread parallel to the delete_association generating the aborts for the outstanding ios on the controller. The i/o completion was freeing the target fcloop context, thus the abort task referenced the just-freed memory.
Correct by clearing the target/initiator cross pointers in the io completion and abort tasks before calling the callbacks. On aborts that detect already finished io's, ensure the complete context is called.
Signed-off-by: James Smart james.smart@broadcom.com Signed-off-by: Christoph Hellwig hch@lst.de Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/nvme/target/fcloop.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-)
--- a/drivers/nvme/target/fcloop.c +++ b/drivers/nvme/target/fcloop.c @@ -374,6 +374,7 @@ fcloop_tgt_fcprqst_done_work(struct work
spin_lock(&tfcp_req->reqlock); fcpreq = tfcp_req->fcpreq; + tfcp_req->fcpreq = NULL; spin_unlock(&tfcp_req->reqlock);
if (tport->remoteport && fcpreq) { @@ -615,11 +616,7 @@ fcloop_fcp_abort(struct nvme_fc_local_po
if (!tfcp_req) /* abort has already been called */ - return; - - if (rport->targetport) - nvmet_fc_rcv_fcp_abort(rport->targetport, - &tfcp_req->tgt_fcp_req); + goto finish;
/* break initiator/target relationship for io */ spin_lock(&tfcp_req->reqlock); @@ -627,6 +624,11 @@ fcloop_fcp_abort(struct nvme_fc_local_po tfcp_req->fcpreq = NULL; spin_unlock(&tfcp_req->reqlock);
+ if (rport->targetport) + nvmet_fc_rcv_fcp_abort(rport->targetport, + &tfcp_req->tgt_fcp_req); + +finish: /* post the aborted io completion */ fcpreq->status = -ECANCELED; schedule_work(&inireq->iniwork);
Patches currently in stable-queue which might be from jsmart2021@gmail.com are
queue-4.15/nvme_fcloop-fix-abort-race-condition.patch queue-4.15/nvme_fcloop-disassocate-local-port-structs.patch