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2015-05-11T06:34:31Z beach: Good morning everyone.
2015-05-11T06:38:22Z beach: What is a good way to debug a "Control stack guard disabled" followed by a "corruption warning" and then a crash?
2015-05-11T06:38:44Z beach: I don't use any FFI and I always use SAFETY 3.
2015-05-11T06:39:14Z beach: Right now I can't provide any details because I am on a different computer.  Just asking general advice.
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2015-05-11T06:48:01Z Xof: control stack guard disabled is typically from too high a depth of recursion
2015-05-11T06:50:16Z beach: Right.
2015-05-11T06:50:43Z beach: Is there a way to get a backtrace then, rather than a corruption?
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2015-05-11T07:00:59Z Xof: well, normally you would end up in the debugger at that point
2015-05-11T07:01:15Z Xof: I suppose it's possible that if one call uses up a whole page of stack, you would hit the actual end
2015-05-11T07:03:09Z beach: Aha!
2015-05-11T07:03:54Z beach: That is entirely possible.
2015-05-11T07:06:14Z Xof: still a bit weird
2015-05-11T07:07:12Z beach: I translate SICL HIR code to Common Lisp and then compile it with the SBCL compiler.  Since I don't do any HIR optmizations, there are lots and lots of temporaries.
2015-05-11T07:08:33Z beach: Could it be possible that the combination of this fact and my having DEBUG 3 would keep these temporaries alive so that they would create a huge stack frame?
2015-05-11T07:09:16Z beach: DEBUG 3 and SPEED 0.
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2015-05-11T07:20:32Z beach: OK, off to try some ideas.  Thanks!
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2015-05-11T07:56:10Z beach: I am back.  By increasing the stack size, I managed to get an ldb prompt rather than a corruption warning.   When I use the backtrace command in ldb, I get only 4 frames, but the help page suggests that I can get more.  However, I don't seem able to find that information anywhere.  Any hints?
2015-05-11T08:03:26Z beach: Let me know if this is not the right channel for question like this.
2015-05-11T08:05:58Z flip214: beach: I think you're right here.
2015-05-11T08:06:24Z flip214: but it may be the wrong time frame (european timezone)
2015-05-11T08:06:34Z beach: Sure.
2015-05-11T08:06:54Z flip214: you could also try to ask in #lisp, perhaps someone's reading there right now.
2015-05-11T08:08:02Z beach: OK, Thanks.
2015-05-11T08:08:19Z beach: I'll do that later.
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2015-05-11T08:12:55Z Shinmera: beach: Well you can pass a number to the ba / backtrace command.
2015-05-11T08:13:36Z beach: I tried that, but it still printed 4 frames.  So I was looking for an ldb manual, but couldn't find any.
2015-05-11T08:15:02Z Shinmera: Well, it prints less than what you get normally if you pass a smaller number, so that suggests that it just can't get more.
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2015-05-11T08:15:58Z beach: Hmm.  OK.
2015-05-11T08:16:13Z Shinmera: I just don't know though, so I may very well be wrong.
2015-05-11T08:18:06Z beach: No problem.  Thanks for trying.
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2015-05-11T08:23:36Z beach: Right, so the default number of stack frames printed by ldb backtrace is 100, which suggests, as Shinmera said, that there aren't any more to print.
2015-05-11T08:24:43Z Shinmera: You could try to attach gdb and see if you can get more info out of the process.
2015-05-11T08:25:15Z beach: Yeah, I think I'll try that.
2015-05-11T08:29:34Z beach: Again, very few stack frames get printed.  I suspect the stack has been trashed for some reason.
2015-05-11T08:35:19Z Cymew: There was a request on the sbcl mailing list a while back about ldb and ldb manual. I'm quite interested in hearing if there are are other documentation than the source for ldb.
2015-05-11T08:37:15Z Shinmera: Given that the ldb author himself thinks it's a hack and shouldn't be active by default... probably not. http://xach.livejournal.com/208882.html?thread=461042#t461042
2015-05-11T08:39:37Z Cymew: Ah, thanks.
2015-05-11T08:40:51Z Cymew: Good to know a bit about it. Maybe a note could be added so it basically says you're in Unknown Lands when it gets invoked.
2015-05-11T08:48:42Z beach: Well, I think I figured out the origin of my problem, independently of the tools being unhelpful.  I think I unintentionally redefined the class named STANDARD-OBJECT.
2015-05-11T08:49:16Z Shinmera: Ah, fun times.
2015-05-11T08:49:31Z Shinmera: How did you manage that without running into the package lock though?
2015-05-11T08:49:52Z Shinmera: Or is that within SICL itself?
2015-05-11T08:51:55Z Cymew: That sounds like it could break things, yeah.
2015-05-11T08:55:18Z beach: Shinmera: Not SICL.  Let me see if I can reproduce it...
2015-05-11T08:57:40Z beach: Shinmera: It appears that the package lock is triggered by DEFCLASS.
2015-05-11T08:58:09Z beach: Shinmera: But if you have the object itself, you can do all kinds of stuff to it, I think.
2015-05-11T08:59:33Z Shinmera: Right.
2015-05-11T09:04:08Z Xof: beach: the "think hard" strategy is sometimes easier than beating the tools into submission :-(
2015-05-11T09:04:14Z Xof: yes, if you have the object itself all bets are off
2015-05-11T09:05:54Z beach: Xof: I agree that "think hard" is sometimes better.  However, thinking hard is, well, hard, so I always try first to obtain additional information from the tools.  When that fails, though, there are not many options left.
2015-05-11T09:06:43Z Shinmera is trying to think hard about build systems but is constantly distracted :(
2015-05-11T09:07:10Z beach: Shinmera: One simple measure is to /part :)
2015-05-11T09:07:34Z Shinmera: It's break time and I'm in a lecture hall, so IRC is the least distracting component.
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2015-05-11T11:34:28Z pkhuong: pfft, compiler writers. I wish I had tools ;)
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2015-05-11T12:40:15Z Cymew: ldb is not in its own source file in the tree, is it? Where is it located anyway?
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2015-05-11T13:06:57Z Cymew: Ah, thanks
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2015-05-11T18:40:14Z Xach: If I use slime to M-. on find-symbol (or anything past make-package in target-package.lisp), I get "Error: The variable *DEFAULT-PACKAGE-USE-LIST* is unbound."
2015-05-11T18:40:39Z stassats: slime is broken
2015-05-11T18:40:51Z stassats: it tries to parse source code and fails miserably
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2015-05-11T18:42:07Z stassats: defun make-package (name &key (use '#.*default-package-use-list*) nicknames (internal-symbols 10) (external-symbols 10))
2015-05-11T18:43:33Z stassats: that's one the things that trips it up and could be easily modified to ignore, but the bigger problem --- interning --- can't be solved without using a custom reader
2015-05-11T18:43:44Z stassats: which arguably it should do
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2015-05-11T18:47:14Z Xach: ok
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2015-05-11T19:27:00Z stassats: why do we have *default-package-use-list* if it's nil?
2015-05-11T19:28:14Z stassats: it's not likely it will ever stop being NIL and I don't see anyone recompiling SBCL just for changing it
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