On Aug 27, 2024, at 8:46 AM, Greg KH greg@kroah.com wrote:
On Sat, Aug 24, 2024 at 12:21:37PM -0400, cel@kernel.org wrote:
From: NeilBrown neilb@suse.de
[ Upstream commit bf32075256e9dd9c6b736859e2c5813981339908 ]
The error paths in nfsd_svc() are needlessly complex and can result in a final call to svc_put() without nfsd_last_thread() being called. This results in the listening sockets not being closed properly.
The per-netns setup provided by nfsd_startup_new() and removed by nfsd_shutdown_net() is needed precisely when there are running threads. So we don't need nfsd_up_before. We don't need to know if it *was* up. We only need to know if any threads are left. If none are, then we must call nfsd_shutdown_net(). But we don't need to do that explicitly as nfsd_last_thread() does that for us.
So simply call nfsd_last_thread() before the last svc_put() if there are no running threads. That will always do the right thing.
Also discard: pr_info("nfsd: last server has exited, flushing export cache\n"); It may not be true if an attempt to start the first server failed, and it isn't particularly helpful and it simply reports normal behaviour.
Signed-off-by: NeilBrown neilb@suse.de Reviewed-by: Jeff Layton jlayton@kernel.org Signed-off-by: Chuck Lever chuck.lever@oracle.com
fs/nfsd/nfssvc.c | 14 ++++---------- 1 file changed, 4 insertions(+), 10 deletions(-)
Reported-by: Li Lingfeng lilingfeng3@huawei.com Suggested-by: Li Lingfeng lilingfeng3@huawei.com Tested-by: Li Lingfeng lilingfeng3@huawei.com
Odd placement of these :)
Wasn't sure I was supposed to add them to the actual patch description because they weren't part of the original upstream commit.
But if that's OK to do for stable patches, I will add them in the usual spot next time.
-- Chuck Lever