Bugs item #3474319, was opened at 2012-01-15 23:26
Message generated for change (Comment added) made by nash_c
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Category: client module
Group: hang
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Nash Tsai (nash_c)
Assigned to: Daniel Stenberg (bagder)
Summary: SMTP & IMAP4 will hang at curl_multi_remove_handle

Initial Comment:
SMTP & IMAP4 will hang at curl_multi_remove_handle, when the connected server is not really the SMTP/IMAP4 server, in our case we accidentally discovered when trying to connect SMTPS and IMAP4S server without specify "smtps://" and "imap4s://" in the url.

Following are the hang call stack:

#0  0x00007ffff6801773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007ffff764c55c in Curl_socket_ready () from /usr/local/lib/libcurl.so.4
#2  0x00007ffff7652892 in Curl_pp_easy_statemach () from /usr/local/lib/libcurl.so.4
#3  0x00007ffff764ffba in imap_easy_statemach () from /usr/local/lib/libcurl.so.4
#4  0x00007ffff765002b in imap_disconnect () from /usr/local/lib/libcurl.so.4
#5  0x00007ffff763629d in Curl_disconnect () from /usr/local/lib/libcurl.so.4
#6  0x00007ffff763c13b in Curl_done () from /usr/local/lib/libcurl.so.4
#7  0x00007ffff7649e0f in curl_multi_remove_handle () from /usr/local/lib/libcurl.so.4

[1/16/12 3:04:38 PM] yaoxing: #0  0x00007ffff6801773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007ffff764c55c in Curl_socket_ready () from /usr/local/lib/libcurl.so.4
#2  0x00007ffff7652892 in Curl_pp_easy_statemach () from /usr/local/lib/libcurl.so.4
#3  0x00007ffff76511df in smtp_easy_statemach () from /usr/local/lib/libcurl.so.4
#4  0x00007ffff7651233 in smtp_disconnect () from /usr/local/lib/libcurl.so.4
#5  0x00007ffff763629d in Curl_disconnect () from /usr/local/lib/libcurl.so.4
#6  0x00007ffff763c13b in Curl_done () from /usr/local/lib/libcurl.so.4
#7  0x00007ffff7649e0f in curl_multi_remove_handle () from /usr/local/lib/libcurl.so.4

I've got a tmp work around as following diff:

diff --git a/contrib/curl-7.23.1/lib/imap.c
index ab53c9d..4b8f7c3 100644
--- a/mite_agent/contrib/curl-7.23.1/lib/imap.c
+++ b/mite_agent/contrib/curl-7.23.1/lib/imap.c
@@ -904,7 +904,7 @@ static CURLcode imap_logout(struct connectdata *conn)
   result = imapsendf(conn, str, "%s LOGOUT", str, NULL);
   if(result)
     return result;
- state(conn, IMAP_LOGOUT);
+ state(conn, IMAP_STOP);
 
   result = imap_easy_statemach(conn);
 
diff --git a/curl-7.23.1/lib/smtp.c
index ea6bafa..232e82d 100644
--- a/mite_agent/contrib/curl-7.23.1/lib/smtp.c
+++ b/mite_agent/contrib/curl-7.23.1/lib/smtp.c
@@ -1491,7 +1491,7 @@ static CURLcode smtp_quit(struct connectdata *conn)
   result = Curl_pp_sendf(&conn->proto.smtpc.pp, "QUIT");
   if(result)
     return result;
- state(conn, SMTP_QUIT);
+ state(conn, SMTP_STOP);
 
   result = smtp_easy_statemach(conn);
 

----------------------------------------------------------------------

>Comment By: Nash Tsai (nash_c)
Date: 2012-01-15 23:28

Message:
cURL version 7.23.1, OS: Linux 2.6.32 & 3.0 kernel

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Received on 2012-01-16