Bug 787424

Has anyone seen this problem? It persists and there's little or no diagostics. Anyway to implicate the server side? Or is this clearly a client side issue?

Thanks,
-Matt

Yes, I have as well.  I did not see it prior to upgrading from F15 to F16, which I did last week.  Prior to that my vpnc connections were stable so I suspect it was regression introduced in F16.

brian

You might try disabling Dead Peer Detection with --dpd-idle 0 or

DPD idle timeout (our side) 0

in the config file.

I just had another thought on this.  My vpnc connection has been rock stable today over several hours of testing.  One notable difference is that I've disabled wifi and am just using wired ethernet.

I can retry with DPD disabled over wifi.  How do I configure vpnc when it's controlled by network manager?

nm-connection-editor and click the VPN tab, double-click your connection.  There's a box for dead peer detection there.  One other thought, perhaps your wifi is dropping for some reason (kernel stupidity, etc) and when it drops for too long, and NM reconnects, then the VPN is gone already too.  But try disabling DPD first.

I should add that I didn't notice any definitive wifi problems, either via the GUI or from network usage.  But it's possible some wifi instability was present that I didn't notice.

I just encountered this again on wifi with dead peer detection disabled.

From the log:
Mar 14 11:56:36 bfallik-laptop kernel: [80866.777576] vpnc[13844]: segfault at 7fb2fb3a3ded ip 00007fb2
fb18ba3d sp 00007fff0af89c10 error 4 in vpnc[7fb2fb17a000+21000]
Mar 14 11:56:37 bfallik-laptop abrtd: Directory 'ccpp-2012-03-14-11:56:37-13844' creation detected
Mar 14 11:56:37 bfallik-laptop abrt[16275]: Saved core dump of pid 13844 (/usr/sbin/vpnc) to /var/spool
/abrt/ccpp-2012-03-14-11:56:37-13844 (638976 bytes)
Mar 14 11:56:37 bfallik-laptop kernel: [80867.048295] libfcoe_device_notification: NETDEV_UNREGISTER tun0

It looks like this was a segfault in VPNC.  Here's the backtrace of the coredump from gdb:
...
Core was generated by `/usr/sbin/vpnc --non-inter --no-detach -'.
Program terminated with signal 11, Segmentation fault.
#0  0x00007ffdbe645a3d in unpack_verify_phase2 (s=0x7fff8d2ddc70, 
    r_packet=0x7ffdbe858b40 "VQ\357\335~h\001\324\255\300I\344\366FF\345\b\020 \001\226E\366\031", 
    r_length=<optimized out>, r_p=0x7fff8d2dd8b8, nonce=0x0, nonce_size=0) at vpnc.c:609
609			for (sz = spos; r_packet[sz] != 0; sz += r_packet[sz + 2] << 8 | r_packet[sz + 3]) ;
Missing separate debuginfos, use: debuginfo-install glibc-2.14.90-24.fc16.6.x86_64 gnome-keyring-3.2.1-3.fc16.x86_64 gnutls-2.12.14-1.fc16.x86_64 zlib-1.2.5-6.fc16.x86_64
(gdb) bt
#0  0x00007ffdbe645a3d in unpack_verify_phase2 (s=0x7fff8d2ddc70, 
    r_packet=0x7ffdbe858b40 "VQ\357\335~h\001\324\255\300I\344\366FF\345\b\020 \001\226E\366\031", 
    r_length=<optimized out>, r_p=0x7fff8d2dd8b8, nonce=0x0, nonce_size=0) at vpnc.c:609
#1  0x00007ffdbe64b1fe in do_rekey (r=0x0, s=0x7fff8d2ddc70) at vpnc.c:3005
#2  process_late_ike (s=0x7fff8d2ddc70, r_packet=<optimized out>, r_length=<optimized out>)
    at vpnc.c:3044
#3  0x00007ffdbe641afd in process_socket (s=0x7fff8d2ddc70) at tunip.c:731
#4  vpnc_main_loop (s=0x7fff8d2ddc70) at tunip.c:902
#5  vpnc_doit (s=0x7fff8d2ddc70) at tunip.c:1064
#6  0x00007ffdbe63d418 in main (argc=<optimized out>, argv=<optimized out>) at vpnc.c:3185
(gdb) 

Please let me know if I can provide anything else.  I'm hesitant to upload the core file since it might contain sensitive bits.

Here's more info from my setup:

* I'm on the wire
* DPD is disabled
* Command line only

Since NM is out of the loop, is there other debugging to turn on?

This is the very simplistic config file.
---

IPSec gateway        <mygateway>
IPSec ID             <myid>
IPSec secret         <mysecret>
Xauth username       <myusername>
Xauth password       <mypass>
DPD idle timeout (our side) 0
Enable Single DES

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