Bug 469412

OK, it appears to have started behaving again - the above lookups are working once again.

By way of a test, I tried this...

[root@detritus ~]# host whois.nic.uk
whois.nic.uk has address 213.248.210.12
[root@detritus ~]# iptables -I OUTPUT --dst 213.248.210.12 -j DROP
[root@detritus ~]# whois gloomytrousers.co.uk
[Querying whois.nic.uk]
^C

...and although the lookup hung, as expected, CPU usage was 0.

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Have seen this since I upgraded to F10. Reopening.

Created attachment 341781 [details]
make jwhois use select

... because it sits in a do/while loop calling read() on a non-blocking socket.

This appears to fix it for me.

Created attachment 341783 [details]
trivial spec patch to use listed patch

Because I can and hopefully it makes it easier for whoever may need to apply it.

Created attachment 341787 [details]
specfile patch ... but actually update the release!

Sigh. :)

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Approximately 30 (thirty) days from now Fedora will stop maintaining
and issuing updates for Fedora 10.  It is Fedora's policy to close all
bug reports from releases that are no longer maintained.  At that time
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bug to the applicable version.  If you are unable to change the version, 
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lifetime, sometimes those efforts are overtaken by events.  Often a 
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This has a patch to fix - could it be released still? Presumably this is applicable to F11/12 too.

I did experience the bug last night (still on F10, haven't upgraded yet).

Just verified that this still exists on f-12:

write(3, "austnet.au\r\n", 12)          = 12
read(3, 0x7fff4dd9e470, 1023)           = -1 EAGAIN (Resource temporarily unavailable)
read(3, 0x7fff4dd9e470, 1023)           = -1 EAGAIN (Resource temporarily unavailable)

... hundreds/thousands more as cpu spikes and jwhois loops ...

read(3, 0x7fff4dd9e470, 1023)           = -1 EAGAIN (Resource temporarily unavailable)
read(3, "No Data Found\r\n", 1023)      = 15
read(3, "", 1023)                       = 0
write(1, "[whois.aunic.net]\nNo Data Found\r"..., 33[whois.aunic.net]
No Data Found
) = 33
exit_group(0)                           = ?

FWIW, I'm seeing this too - but only when IPV6 is involved. 
From strace whois 74.220.121.126:
<normal stuff I suppose>
connect(3, {sa_family=AF_INET, sin_port=htons(43), sin_addr=inet_addr("199.212.0.43")}, 16) = 0
getsockname(3, {sa_family=AF_INET6, sin6_port=htons(40891), inet_pton(AF_INET6, "::ffff:68.192.13.200", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, [28]) = 0
close(3)                                = 0
socket(PF_INET6, SOCK_STREAM, IPPROTO_TCP) = 3
fcntl(3, F_GETFL)                       = 0x2 (flags O_RDWR)
fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK)    = 0
connect(3, {sa_family=AF_INET6, sin6_port=htons(43), inet_pton(AF_INET6, "2001:500:4:1::81", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, 28) = -1 EINPROGRESS (Operation now in progress)
select(1024, NULL, [3], NULL, {75, 0})  = 1 (out [3], left {74, 979698})
getsockopt(3, SOL_SOCKET, SO_ERROR, [-4985675827644465152], [4]) = 0
write(3, "74.220.121.126\r\n", 16)      = 16
read(3, 0x7fffbacf4d30, 1023)           = -1 EAGAIN (Resource temporarily unavailable)
read(3, 0x7fffbacf4d30, 1023)           = -1 EAGAIN (Resource temporarily unavailable)
<continues forever>

jwhois-4.0-19.fc12 has been submitted as an update for Fedora 12.
http://admin.fedoraproject.org/updates/jwhois-4.0-19.fc12

jwhois-4.0-19.fc12 has been pushed to the Fedora 12 testing repository.  If problems still persist, please make note of it in this bug report.
 If you want to test the update, you can install it with 
 su -c 'yum --enablerepo=updates-testing update jwhois'.  You can provide feedback for this update here: http://admin.fedoraproject.org/updates/F12/FEDORA-2010-1172

Fedora 11 has this bug in its latest jwhois package. I believe the best fix is simply to turn off non-blocking mode after connecting. I suggest the following patch. (I will try to contact the jwhois maintainers too.)

--- jwhois-4.0/src/utils_old.c  2010-01-29 16:00:21.261869369 -0800
+++ jwhois-4.0/src/utils.c      2010-01-29 16:00:43.007869124 -0800
@@ -298,6 +298,11 @@ make_connect(const char *host, int port)
       break;
     }
 #endif
+  flags = fcntl(sockfd, F_GETFL, 0);
+  if (fcntl(sockfd, F_SETFL, flags&~O_NONBLOCK) == -1)
+    {
+      return -1;
+    }
 
   return sockfd;
 }

(In reply to comment #15)
> Fedora 11 has this bug in its latest jwhois package. I believe the best fix is
> simply to turn off non-blocking mode after connecting. I suggest the following
> patch. (I will try to contact the jwhois maintainers too.)
> 
> --- jwhois-4.0/src/utils_old.c  2010-01-29 16:00:21.261869369 -0800
> +++ jwhois-4.0/src/utils.c      2010-01-29 16:00:43.007869124 -0800
> @@ -298,6 +298,11 @@ make_connect(const char *host, int port)
>        break;
>      }
>  #endif
> +  flags = fcntl(sockfd, F_GETFL, 0);
> +  if (fcntl(sockfd, F_SETFL, flags&~O_NONBLOCK) == -1)
> +    {
> +      return -1;
> +    }
> 
>    return sockfd;
>  }    

Did you try jwhois-4.0-14.fc11 from testing repository? It should be fixed there...

jwhois-4.0-19.fc12 has been pushed to the Fedora 12 stable repository.  If problems still persist, please make note of it in this bug report.

Created attachment 667375 [details]
strace whois google.com

Comment on attachment 667375 [details]
strace whois google.com

I'm having the very same issue on CentOS 6.3 with jwhois 4.0-19.el6, attached strace output.