I've been having problems with the client/server mode of fio where
occasionally I will get CRC errors or packet mismatches.
I think the source of the problem is that the file descriptor for the
socket is 1 or 2 and something is writing to stdout or stderr. After
I cleaned up some problems with my plugin the problem seems to have
gone away.
It looks like there are a few places where this can happen:
In fio.h fio_assert writes to stderr ... Maybe this should use f_err?
The debug malloc also writes to stderr if it detects memory corruption...
Also in json_object_add_client_info, if no hostname is specified,
client->hostname is NULL so we'll dump core...
iff --git a/client.c b/client.c
index 1f52734..78a957e 100644
--- a/client.c
+++ b/client.c
@@ -825,7 +825,8 @@ static void convert_gs(struct group_run_stats
*dst, struct group_run_stats *src)
static void json_object_add_client_info(struct json_object *obj,
struct fio_client *client)
{
- json_object_add_value_string(obj, "hostname", client->hostname);
+ const char *hostname = client->hostname ? client->hostname : "";
+ json_object_add_value_string(obj, "hostname", hostname);
json_object_add_value_int(obj, "port", client->port);
}
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