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| author | NeilBrown <neilb@suse.de> | 2024-06-19 04:05:13 +0300 |
|---|---|---|
| committer | Anna Schumaker <Anna.Schumaker@Netapp.com> | 2024-07-08 20:47:24 +0300 |
| commit | 6258cf25d5e3155c3219ab5a79b970eef7996356 (patch) | |
| tree | 4766a377f688ce32725fa1aebf927f111c311f2b /net/sunrpc | |
| parent | 0e13dd9ea8be46f980a46c3ffd8cb786f3e2fb5b (diff) | |
| download | linux-6258cf25d5e3155c3219ab5a79b970eef7996356.tar.xz | |
SUNRPC: avoid soft lockup when transmitting UDP to reachable server.
Prior to the commit identified below, call_transmit_status() would
handle -EPERM and other errors related to an unreachable server by
falling through to call_status() which added a 3-second delay and
handled the failure as a timeout.
Since that commit, call_transmit_status() falls through to
handle_bind(). For UDP this moves straight on to handle_connect() and
handle_transmit() so we immediately retransmit - and likely get the same
error.
This results in an indefinite loop in __rpc_execute() which triggers a
soft-lockup warning.
For the errors that indicate an unreachable server,
call_transmit_status() should fall back to call_status() as it did
before. This cannot cause the thundering herd that the previous patch
was avoiding, as the call_status() will insert a delay.
Fixes: ed7dc973bd91 ("SUNRPC: Prevent thundering herd when the socket is not connected")
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'net/sunrpc')
| -rw-r--r-- | net/sunrpc/clnt.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c index cfd1b1bf7e35..09f29a95f2bc 100644 --- a/net/sunrpc/clnt.c +++ b/net/sunrpc/clnt.c @@ -2326,12 +2326,13 @@ call_transmit_status(struct rpc_task *task) task->tk_action = call_transmit; task->tk_status = 0; break; - case -ECONNREFUSED: case -EHOSTDOWN: case -ENETDOWN: case -EHOSTUNREACH: case -ENETUNREACH: case -EPERM: + break; + case -ECONNREFUSED: if (RPC_IS_SOFTCONN(task)) { if (!task->tk_msg.rpc_proc->p_proc) trace_xprt_ping(task->tk_xprt, |