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| AlexDaniel | huggable: bots | 01:43 | |
| huggable | AlexDaniel, The #perl6 irc channel normally hosts several helpful bots. I am a bot, and everyone else voiced on this channel is a bot. See the full list here: github.com/perl6/doc/issues/711#is...-235414744 | ||
| AlexDaniel | MasterDuke: fwiw, maintainers should be listed for each bot here ↑ | 01:44 | |
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| MasterDuke | ah right, forgot about that | 01:58 | |
| japhb | AlexDaniel: Should it be more aware of which IRC channel it is speaking on, rather than referring only to #perl6? | 02:56 | |
| AlexDaniel | huggable: that's just a static factoid, so it's probably ok | ||
| huggable | AlexDaniel, nothing found | ||
| AlexDaniel | japhb: ↑ :) | ||
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| Geth | MoarVM: samcv++ created pull request #761: Improvements to ucd2c.pl |
06:33 | |
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| brrt | good * #moarvm | 08:45 | |
| yoleaux | 6 Dec 2017 21:00Z <jnthn> brrt: SEGV in linear scan allocator: gist.github.com/MasterDuke17/45323...4409368975 | ||
| brrt | ouch, thank you | ||
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| brrt | damnit, that doesn't crash for me | 09:25 | |
| and i can't start valgrind :-( | |||
| i'll try and start a virtual machine then | 09:26 | ||
| nwc10 | brrt: paste.scsys.co.uk/566116 | ||
| and only yesterday I was going to "complain that ASAN was getting bored, but then I though "be careful what you wish for" | 09:27 | ||
| does anyone have a colo(u)r pastebot so that I could paste it in all its pavement-pizza glory? | |||
| brrt | that'd be cool, yes | 09:29 | |
| oh, that's a pretty good stack trace though | 09:31 | ||
| that gives me virtually all the necessary information | |||
| nwc10 | I'm probably AFK in about an hour from now, so if you have time to cook up something to (re)test before then, it should be able to | 09:38 | |
| otherwise, not sure when | |||
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| brrt | i'm a bit puzzled still | 09:50 | |
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| nwc10 | oops, be careful what you wish for | 10:28 | |
| ASAN barfage in JIT code paste.scsys.co.uk/566117 | 10:29 | ||
| brrt: is that the same place? | |||
| afk for a bit | 10:30 | ||
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| brrt | yes, it is | 11:16 | |
| same place | |||
| not sure why still! | |||
| lizmat | brrt: I suspect some initialization issue, as it either happens after ~ 200 msecs, *or* it runs to completion without any issues in about 950 msecs | 11:20 | |
| I have not seen any crashes after 200 msecs | |||
| brrt | hmm, odd | 11:22 | |
| anyway, valgrind / ASAN makes it crash quite relaibly | |||
| the question is, why the use-after-free | |||
| because the valuerefs are allocated from a single buffer that doesn't grow, and in fact that's not the growing buffer | 11:23 | ||
| oh, hang on | 11:24 | ||
| i know why | |||
| lizmat | whee! | 11:30 | |
| brrt | double-pointer trick wreaks havoc with the realloc | 11:47 | |
| that would've been a good title for a blog though | 12:27 | ||
| meh, i'll be saddened to see it go | 12:29 | ||
| Geth | MoarVM: 5484f048ee | (Bart Wiegmans)++ | src/jit/linear_scan.c [JIT] Don't take a pointer-pointer to a moving object This would cause segmentation faults because the alc->values array (which backed the spillee object) could move in a realloc, and the pointer-pointer to the ValueRef would point inside this object. We don't actually need that, we can get by with two separate pointers and a comma. Note that we'd also assign to the (potentially moved) spillee object, which is what I suspect was the real cause to the SEGV, but ASAN already found the invalid read earlier. |
12:42 | |
| brrt | .tell lizmat jnthn nwc10 fixed | ||
| yoleaux | brrt: I'll pass your message to lizmat. | ||
| nwc10 | brrt: paste.scsys.co.uk/566118 -- src/jit/linear_scan.c:720:48: runtime error: member access within null pointer of type 'struct ValueRef | 12:49 | |
| brrt | fuuuuuuuuu | 13:07 | |
| :-( | |||
| oh, i see | |||
| yeah | |||
| hmmm | |||
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| Geth | MoarVM: 924a75d556 | (Bart Wiegmans)++ | src/jit/linear_scan.c [JIT] moreover, don't read a NULL struct If the next pointer is already NULL it makes no sense to read it. |
13:45 | |
| brrt | .ask lizmat if the —asan option is working for you, because, i think i have a way to fix it on OSX | ||
| yoleaux | brrt: I'll pass your message to lizmat. | ||
| lizmat | --asan is not working for me :-) | 13:46 | |
| yoleaux | 13:45Z <brrt> lizmat: if the —asan option is working for you, because, i think i have a way to fix it on OSX | ||
| brrt | okay, then i may have a fix for that as well | 13:47 | |
| Geth | MoarVM: f2c35e1333 | (Bart Wiegmans)++ | Configure.pl [ASAN] fix flags for darwin Apple is ... exceptional, about how to setup flags for ASAN support |
13:49 | |
| brrt | by the way | 14:07 | |
| i've been thinking of a way to write a generic 'top-down tree matching funciton | |||
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| brrt | anyway, what i wanted to say was | 15:17 | |
| the idea was to combine an array with a string that tells me how to interpret the string | |||
| almost like data and instructions | |||
| this is a pattern, hmmm | |||
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| travis-ci | MoarVM build errored. Bart Wiegmans '[ASAN] fix flags for darwin | 19:19 | |
| travis-ci.org/MoarVM/MoarVM/builds/312964683 github.com/MoarVM/MoarVM/compare/9...c35e1333e3 | |||
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| timotimo | src/strings/unicode.c:72236:83: warning: pointer/integer type mismatch in conditional expression | 22:06 | |
| ? Bidi_Mirroring_Glyph_enums[0] : Bidi_Mirroring_Glyph_enums[result_val]) : bogus; | |||
| should we be worried about this at all? i suppose it's not a problem if it's "bogus"? | |||
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