选择chaos这个词是因为~~实在很难找到一个更合适的词来形容这儿了……
Yes, finally postfix is supporting DSN. To quote Witese, this is the first postfix snapshot which provides “full support for RFC 3461..3464 Delivery Status Notifications”!
Read more...I have done several experiments/asserts to ensure that the panic is related to ULE+PREEMPTION case only.
ULE: no panic
4BSD: no panic
4BSD+PREEMPTION: no panic
My latest progress is that I found that sched_switch in ULE for the threaded case, can decide whether subsequent call would panic. Investigating.
Read more...My company has offered me some test equipment (namely, a HP 360 with ILO, which is *great* for debugging at home!), and I has started to trip over the ULE code and find for bugs.
Read more...You can obtain latest list from sys/sys/proc.h:
* Below is a key of locks used to protect each member of struct proc. The
* lock is indicated by a reference to a specific character in parens in the
* associated comment.
* * - not yet protected
* a - only touched by curproc or parent during fork/wait
* b - created at fork, never changes
* (exception aiods switch vmspaces, but they are also
* marked 'P_SYSTEM' so hopefully it will be left alone)
* c - locked by proc mtx
* d - locked by allproc_lock lock
* e - locked by proctree_lock lock
* f - session mtx
* g - process group mtx
* h - callout_lock mtx
* i - by curproc or the master session mtx
* j - locked by sched_lock mtx
* k - only accessed by curthread
* l - the attaching proc or attaching proc parent
* m - Giant
* n - not locked, lazy
* o - ktrace lock
* p - select lock (sellock)
* q - td_contested lock
* r - p_peers lock
* x - created at fork, only changes during single threading in exec
* z - zombie threads/ksegroup lock
Today Giorgos Keramidas (keramida@) has noted that the following skill that can minimize lock period:
From: http://y.sina.com.cn 2005年06月17日 11:24 榕树下 文/流浪猫
这是我的一个同事给我讲的他上高中时一个真实的故事。
那一年他上高二，因为他家住在外地，所以他从上高中就在学校住校。他们高中大部分都是长春本市的学生，住校的同学相对较少，他们寝室也就只住了四个人。从生日排行，他排老四。他们寝的老大跟他是同乡，他们俩的关系比较好。
那是快要放暑假的时候，他们考完试，等着发表成绩。这时候已经没有什么课了，学习也比较轻松。那天是星期五，晚上吃完饭没有什么事，几个人就在寝室里侃大山。说着说着，就说到一些奇异的事情上面来了。
老三就说：「哎，你们听没听过一个游戏，说是比‘碟仙’更吓人。」
老二问：「啥游戏啊？」
「拍鬼。你们听过吗？」
我们同事就说：「没听过。咋玩呀？」
Read more...有一天，我们发现了一个bug。
然是有人决定把它workaround掉，大家都很开心。
突然有一天，那个bug被修了。
然后workaround变成了bug……所以说坚决抵制workaround。。。
Read more...It seems that I have hit a bug, where kseq_nice_rem is being called too much. Have read the code and added some KASSERT/MPASS’es.
Read more...pav@ has put together this which looks quite interesting. Have a read of it :-)
(Got that from arved@’s blog)
Read more...细想了想，我有印象的他说的几句话都非常的实在和有道理。
我相信时间能够证明这一切。
Read more...