src/http/modules/ngx_http_proxy_module.c:1573: error: Buffer Overrun L2
  Offset: [0, 4048] Size: 2048 by call to `ngx_log_error_core`.

src/http/modules/ngx_http_proxy_module.c:1472:14: Unknown value from: ngx_http_parse_header_line
1470.     for ( ;; ) {
1471. 
1472.         rc = ngx_http_parse_header_line(r, &r->upstream->buffer, 1);
                   ^
1473. 
1474.         if (rc == NGX_OK) {

src/http/modules/ngx_http_proxy_module.c:1573:9: Call
1571.         /* there was error while a header line parsing */
1572. 
1573.         ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
              ^
1574.                       "upstream sent invalid header");
1575. 

src/core/ngx_log.c:67:1: Array declaration
  65. #if (NGX_HAVE_VARIADIC_MACROS)
  66. 
  67. void
      ^
  68. ngx_log_error_core(ngx_uint_t level, ngx_log_t *log, ngx_err_t err,
  69.     const char *fmt, ...)

src/core/ngx_log.c:88:5: Assignment
  86.     }
  87. 
  88.     last = errstr + NGX_MAX_ERROR_STR;
          ^
  89. 
  90.     ngx_memcpy(errstr, ngx_cached_err_log_time.data,

src/core/ngx_log.c:133:13: Call
  131.                                            ? " (%d: " : " (%Xd: ", err);
  132. #else
  133.         p = ngx_snprintf(p, last - p, " (%d: ", err);
                   ^
  134. #endif
  135. 

src/core/ngx_string.c:109:1: Parameter `max`
    107. 
    108. 
    109. u_char * ngx_cdecl
         ^
    110. ngx_snprintf(u_char *buf, size_t max, const char *fmt, ...)
    111. {

src/core/ngx_string.c:116:9: Call
    114. 
    115.     va_start(args, fmt);
    116.     p = ngx_vsnprintf(buf, max, fmt, args);
                 ^
    117.     va_end(args);
    118. 

src/core/ngx_string.c:123:1: <Length trace>
121. 
122. 
123. u_char *
     ^
124. ngx_vsnprintf(u_char *buf, size_t max, const char *fmt, va_list args)
125. {

src/core/ngx_string.c:123:1: Parameter `*buf`
      121. 
      122. 
      123. u_char *
           ^
      124. ngx_vsnprintf(u_char *buf, size_t max, const char *fmt, va_list args)
      125. {

src/core/ngx_string.c:244:25: Array access: Offset: [0, 4048] Size: 2048 by call to `ngx_log_error_core` 
      242.                 if (slen == (size_t) -1) {
      243.                     while (*p && buf < last) {
      244.                         *buf++ = *p++;
                                   ^
      245.                     }
      246. 
