From e2a0dbe22e361d1044fd4e0f461ee3bb7d043428 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Sat, 15 Apr 2017 19:20:01 -0400 Subject: [PATCH] NFSv4: Fix a hang in OPEN related to server reboot If the server fails to return the attributes as part of an OPEN reply, and then reboots, we can end up hanging. The reason is that the client attempts to send a GETATTR in order to pick up the missing OPEN call, but fails to release the slot first, causing reboot recovery to deadlock. Signed-off-by: Trond Myklebust Fixes: b8835e14e12ff ("NFSv4.1: Close callback races for OPEN, LAYOUTGET...") Cc: stable@vger.kernel.org # v4.8+ --- fs/nfs/nfs4proc.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 4e52ac773d1f5..6e9ff2d9a5bf5 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -2300,8 +2300,10 @@ static int _nfs4_proc_open(struct nfs4_opendata *data) if (status != 0) return status; } - if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) + if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) { + nfs4_sequence_free_slot(&o_res->seq_res); nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label); + } return 0; } -- 2.39.5