Upstream always NULL

[Tigran Bayburtsyan]

function ngx_http_upstream_create , always returning NGX_ERROR . using
Debugger I saw that after this lines

u = ngx_pcalloc(r->pool, sizeof(ngx_http_upstream_t));

    if (u == NULL) {

        return NGX_ERROR;

    }

 

ngx_ pcalloc always returning null. 

Is there anybody know this issue ?

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