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WinDbg callstack showing many lines of the same function call

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02-05-2015, 10:26 PM #1
Volt404
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WinDbg callstack showing many lines of the same function call
I'm currently looking into a memory dump of a service to find anything peculiar going on that may be causing high CPU utilization on the service. I came across a thread that contains a callstack that is probably more than a hundred lines long, and all the calls point to the same function -- Curl_inet_ntop. The service does use libcurl.

I'm not exactly sure what this means. Could anybody explain why one thread has a callstack full of the same function calls?

I only pasted a portion of the callstack here, since it looks redundant:
Code:
0:008> kb
RetAddr           : Args to Child                                                           : Call Site
00000000`0089e0d4 : 0369f3dc`0089e0c0 00000001`00000000 ffffffff`0097541c 00000000`0369e494 : TestService!Curl_inet_ntop+0x714
00000000`0089e0d4 : 0097541c`00000000 0369e4a4`00000000 00000000`00000000 00000089`00000000 : TestService!Curl_inet_ntop+0x714
00000000`0089e0d4 : 00000003`00000000 00000000`00000000 00000017`00000000 00000000`00000000 : TestService!Curl_inet_ntop+0x714
00000000`0089e0d4 : 00000000`00000000 00000002`00000000 00000001`0097541c 010669d0`0369e4f8 : TestService!Curl_inet_ntop+0x714
00000000`0089e0d4 : 00973376`00000000 775b1b47`00973379 01060000`01060000 010dba60`01060000 : TestService!Curl_inet_ntop+0x714
00000000`0089e0d4 : 775b5bb8`0369e544 0000077f`01060000 010dba68`775b1ace 0000a4b0`000007ff : TestService!Curl_inet_ntop+0x714
00000000`0089e0d4 : 01060000`010dba60 01060054`00000000 0000a4b0`0000a4b0 7757f7f1`0369e598 : TestService!Curl_inet_ntop+0x714
00000000`0089e0d4 : 00000800`01060000 01060000`00000000 00000000`010dba60 000007ff`0111ba70 : TestService!Curl_inet_ntop+0x714
00000000`0089e0d4 : 01060000`000024af 00000000`010dba60 00000000`8b0024af 010ce9e0`01060000 : TestService!Curl_inet_ntop+0x714
00000000`0089e0d4 : 010dba60`00000000 00000003`01060000 00000000`00000000 0000000a`00000000 : TestService!Curl_inet_ntop+0x714
00000000`0089e0d4 : 00000003`00000000 00000000`00000000 0000005f`00000000 00000003`00000000 : TestService!Curl_inet_ntop+0x714
00000000`0089e0d4 : 00000000`00000000 00000030`00000000 00000003`00000000 00000000`00000000 : TestService!Curl_inet_ntop+0x714
00000000`0089e0d4 : 00000001`00000000 00000001`00000000 00000000`00000000 00977ae4`00000000 : TestService!Curl_inet_ntop+0x714
00000000`0089e0d4 : 00000001`0369e640 00000000`00000000 017897f8`00000000 0369e644`00000000 : TestService!Curl_inet_ntop+0x714
00000000`0089e0d4 : 00000000`ffffffff 00000000`775b1e12 77565191`0369f2f4 fffffffe`7837cb7b : TestService!Curl_inet_ntop+0x714

02-05-2015, 11:08 PM #2
KoBE
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Posts: 4,862 Threads:494 Joined: Jun 2011 Reputation: 67

RE: WinDbg callstack showing many lines of the same function call
Unfortuneatly I don't know much about WinDBG, check out this thread though and see if you find anything useful: http://tech.reboot.pro/showthread.php?tid=2809

You might send Shintaro a PM too, he would be a good person to help I think. Hopefully the PM gets sent to his email and he comes around.




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