From 0a7023506112ea7c634dffe08683d5d90f52eec6 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Mon, 23 Jan 2017 22:44:12 -0500 Subject: NFSv4.1: Fix a deadlock in layoutget commit 8ac092519ad91931c96d306c4bfae2c6587c325f upstream. We cannot call nfs4_handle_exception() without first ensuring that the slot has been freed. If not, we end up deadlocking with the process waiting for recovery to complete, and recovery waiting for the slot table to drain. Fixes: 2e80dbe7ac51 ("NFSv4.1: Close callback races for OPEN, LAYOUTGET...") Signed-off-by: Trond Myklebust Signed-off-by: Greg Kroah-Hartman --- fs/nfs/nfs4proc.c | 1 + 1 file changed, 1 insertion(+) (limited to 'fs') diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 241da19b7da4..e475a3d13f27 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -8371,6 +8371,7 @@ nfs4_layoutget_handle_exception(struct rpc_task *task, goto out; } + nfs4_sequence_free_slot(&lgp->res.seq_res); err = nfs4_handle_exception(server, nfs4err, exception); if (!status) { if (exception->retry) -- cgit v1.2.3