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  14    <H1>[IRCServices Coding] Services 5.0a22 Segfault on unlink</H1>
  15     <B>Russell Garrett</B>
  16     <A HREF="mailto:ircservices-coding%40ircservices.za.net?Subject=%5BIRCServices%20Coding%5D%20Services%205.0a22%20Segfault%20on%20unlink&In-Reply-To=1275.193.237.130.98.1014480946.squirrel%40secure.uksolutions.co.uk"
  17        TITLE="[IRCServices Coding] Services 5.0a22 Segfault on unlink">rg at tcslon.com
  18        </A><BR>
  19     <I>Sat Feb 23 08:30:50 PST 2002</I>
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  34 <PRE>&gt;<i> I guess it could be as simple as &quot;unlink self&quot; causing the crash.
  35 </I>&gt;<i> Hopefully, that will be sufficient information to begin
  36 </I>&gt;<i> tracking down the
  37 </I>&gt;<i> bug, I will try to get a fully reproducible case later.
  38 </I>
  39 [16:19:26] -&gt; *nickserv* unlink Russ
  40 [16:19:26] -NickServ- Nick Russ has been unlinked from your nick.
  41 [16:20:57] -&gt; *nickserv* status Russ
  42 [16:20:57] -NickServ- STATUS Russ 0
  43
  44 Here it seems unlinking yourself appears to deregister the nick.
  45
  46 BUT... I reregister my nick:
  47
  48 [16:22:43] -NickServ- Authorization succeeded; your nickname
  49 registration is now complete.
  50 [16:23:02] -&gt; *nickserv* unlink Russ
  51 [16:23:02] -NickServ- Nick Russ has been unlinked from your nick.
  52 *** Routing -- from apollo.final-conflict.net: Server
  53 services.final-conflict.net[<A HREF="http://www.ircservices.za.net/mailman/listinfo/ircservices-coding">unknown at 0.0.0.0</A>] closed the connection
  54
  55 And bang! we have a segfault. The services log is quite cryptic in
  56 saying:
  57
  58 [Feb 23 16:23:02 2002] nickserv/link:
  59
  60 (that's it)
  61
  62 And here's a backtrace:
  63
  64 (gdb) bt
  65 #0  0x40063431 in tmpfile () from /lib/libc.so.6
  66 #1  0x40066724 in freopen64 () from /lib/libc.so.6
  67 #2  0x40061966 in _IO_vfscanf () from /lib/libc.so.6
  68 #3  0x8051430 in vlogprintf (fmt=0x4015d900 &quot;0&quot;, args=0xbffff5f8) at
  69 log.c:34
  70 #4  0x8051727 in _module_log (modname=0x81220c0 &quot;nickserv/link&quot;,
  71 fmt=0x4015d900 &quot;0&quot;) at log.c:189
  72 #5  0x4015d3dd in do_unlink (u=0x812ece0) at link.c:101
  73 #6  0x804df7a in run_cmd (service=0x8120df0 &quot;NickServ&quot;, u=0x812ece0,
  74 id=0x811d1c8, cmd=0xbffff72e &quot;unlink&quot;) at commands.c:175
  75 #7  0x4014f377 in _init () from
  76 /home/ircservices/modules/nickserv/main.so
  77 #8  0x8053f1d in call_callback_5 (module=0x0, id=26, arg1=0xbffff95c,
  78 arg2=0xbffff724, arg3=0xbffff72e, arg4=0x0, arg5=0x0) at
  79 modules.c:623
  80 #9  0x80521c5 in m_privmsg (source=0xbffff95c &quot;Russ&quot;, ac=2,
  81 av=0x812e838) at messages.c:170
  82 #10 0x805447c in process () at process.c:131
  83 #11 0x8051a31 in readline_callback (s=0x812bb70, param_unused=0x24)
  84 at main.c:158
  85 #12 0x80557bf in check_sockets () at sockets.c:375
  86 #13 0x8051c8d in main (ac=1, av=0xbffffb54, envp=0xbffffb5c) at
  87 main.c:255
  88
  89 (this backtrace may be invalid, as I don't have gdb on my services
  90 machine, so I had to copy the files to another box with a slightly
  91 earlier version of services on - it looks ok though)
  92
  93
  94 Russ Garrett (<A HREF="http://www.ircservices.za.net/mailman/listinfo/ircservices-coding">russ at garrett.co.uk</A>)
  95
  96
  97 </PRE>
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