The idnsSentQueryVC function called as AsyncCall. There is the possibility

when this function called the fd has start closing but not realy closed yet.
In this case this function will try to do a comm_write (idnsDoSendQueryVC
function) on sockect which closing and an assertion will triggered.
An extra test needed here to test if the socket closing and if yes just return.

diff --git a/src/dns_internal.cc b/src/dns_internal.cc
index e2dd0cf9dddf838a0f85777bb367cd46c076ba7c..02e85164145e491fc728aac048f23c37c592c56e 100644 (file)
--- a/src/dns_internal.cc
+++ b/src/dns_internal.cc
@@ -40,6 +40,7 @@
 #include "SquidTime.h"
 #include "Store.h"
 #include "comm.h"
+#include "fde.h"
 #include "MemBuf.h"
 
 #include "wordlist.h"
@@ -676,6 +677,9 @@ idnsSentQueryVC(int fd, char *buf, size_t size, comm_err_t flag, int xerrno, voi
 
     if (flag == COMM_ERR_CLOSING)
         return;
+    
+    if (fd_table[fd].closing())
+       return;
 
     if (flag != COMM_OK || size <= 0) {
         comm_close(fd);