原因是对于 DownLoadPortrait() 无休止的调用。猜想的原因如下：

DownLoadPortrait() 本身在 GetPortrait() 中通过 purple_input_add() 被注册为一个 input handler，句柄被保存在 who->inpa 中；而在 DownLoadPortrait() 函数体内又使用 purple_input_remove() 将自己解除注册。

问题是，Pidgin 是一个使用异步 I/O 的多线程程序，因此在前一个 input handler 被解除注册之前，GetPortrait() 可能又注册了一个新的并覆盖了旧的句柄，这样原来的 input handler 永远不会被删除，最后 input handler 就越来越多。

昨天聊起台湾之子的一生，本省出身，平民子弟，自立成才，台大法律系第一毕业，律考全台第一，全国最年轻的律师；富家女与穷小子的不离不弃的爱情；美丽岛的辩护律师，无畏地为自由人权发声；满意度达八成的台北市长；直选的国家领导人，转型正义。50 年的光环，整个民族的希望，“台湾梦”的典范。然后贪腐被揭，可耻的第二次入狱，拙劣的表演和自辩。

权力是毒药，把英雄蜕变成小丑。

http://blog.19lou.com/11528655/viewspace-2111500

加酶凝结（coagulation）⇒凝乳（curd）（奶酪（cheese））+乳清（whey）
撇奶（skimming）⇒奶油（cream）+脱脂奶（skimmed milk）

搅乳（churning）⇒黄油（butter）+白脱牛奶（buttermilk）

3DNow! was a neat enhancement to the original MMX; the design was clever, clean and hence elegant from an engineer's perspective. And it was welcomed with warmth, until Intel pushed out its SSE which was wider, larger and a lot more complex. 3DNow! was soon abandoned, due to the facts that Intel had much stronger muscle in marketing and AMD was forced to support SSE in later revisions of its products.

Now, SSE5 again is an elegant enhancement to SSE. Things haven't changed in AMD: they continue to address real world problems by introducing as little overhead as possible. Fused multiply add, independent rotation and shifting, these cookies are wanted by engineers for a long long time.

But Intel haven't changed either: AVX, wider, larger and a lot more complex. Surely AVX will perform better in SPECfp thanks to its brute force approach, but it simply isn't wise enough. Can't they just make SSE faster? Why don't they continue the way they do SSSE3 and SSE4 aka the small but to the point way? Are they planning to expand x86 into a real abomination despite the fact that it's already hated by many because they still wish a general shift toward IA-64 (which is hated by no less)?

1. src <<= 1; pmulhw dest, src; dest += 1; dest >>= 1;
2. pmulhrw dest, src;
3. src >>=1; pmulhrwc/pmulhrsw dest, src;

As your experience grows you would feel that the 3DNow!/Extended 3DNow! design is really neat and elegant. The designers simply had more engineering sense than those who designed SSE. Really sad that AMD has stopped its evolution.