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Welcome to the main channel on the development of MoarVM, a virtual machine for NQP and Rakudo (moarvm.org). This channel is being logged for historical purposes. Set by lizmat on 24 May 2021. |
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| jnthnwrthngtn | Moarning. So it turns out I can turn one of the failing NQP tests after switching method dispatch to new-disp into a SEGV by deleting some of the test, and so probably the other odd failure mode is also a result of some kind of memory corruption... | 08:45 | |
| Nicholas | "my machine" (several of them) are currently powered down because they in Oregon, and it's hot there. | 08:46 | |
| so I don't have access to anything fast with ASAN or valgrind | 08:47 | ||
| jnthnwrthngtn | I'm guessing "hot" means "very unusually hot"... | 08:50 | |
| Nicholas | whole of the west coast of North America is, I believe. Canada is breaking records. | 08:51 | |
| moon-child | yeah, last few days have been hell | ||
| Nicholas | so powering down non-essential services seemed like a good plan | ||
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| jnthnwrthngtn | uhh... | 09:21 | |
| MVMObject *fateres = MVM_repr_alloc_init(tc, tc->instance->boot_types.BOOTIntArray); | |||
| MVM_ASSERT_NOT_FROMSPACE(tc, fateres); | |||
| The assert fails right after allocation?! | |||
| Ah, I guess it means something wrote into the previous nursery | 09:24 | ||
| So it's not all zeroed | 09:25 | ||
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| Nicholas | ooh fun. Once upon a time I had a hacky patch to allocate nurseries with mmap and change them to unaccessable when not in use. That would have exploded with this. | 09:41 | |
| if your guess is right | |||
| hmm, I wonder *how* hacky it is, and whether it's viable to make it a conditional compile... | 09:42 | ||
| but not this morning. Or at least, this part of today. | |||
| jnthnwrthngtn | Yeah, I did wonder about mprotect hacks | 09:44 | |
| Can't rr it as it seems not to support AMD CPUs (or AMD CPUs don't support it...) | 09:50 | ||
| Nicholas | Aaa(rr)gh | ||
| At least one of the (powered off) machines could run rr | |||
| I can't remember if it was Intel, or if there is some new enough AMD CPU that rr can work with. | 09:51 | ||
| Either way, can't currently help | |||
| jnthnwrthngtn | Ah, it seems there are patches in rr for zen and zen 2 architectures, but I think I've zen 3 | 09:56 | |
| So mine is maybe too new | |||
| argh | |||
| Turns out the cheap way to get some an effect is to free the fromspace memory always after GC is done | 10:04 | ||
| And then let ASAN report the write to freed memory | 10:05 | ||
| Goodness, this finds all kinds | 10:11 | ||
| Bleh, though having now fixed those, it turns out they weren't the actual issue the test runs into, which instead seems to be about memory managed with the FSA | 10:28 | ||
| meeting and lunch now, guess I'll try to hunt it down later | |||
| nine | Nicholas, jnthnwrthngtn: github.com/MoarVM/MoarVM/commit/9d...4d9f5b579c | 10:48 | |
| jnthnwrthngtn: rr runs just fine on zen3. I use github.com/rr-debugger/rr/wiki/Zen...nel-module | 10:51 | ||
| Just load that kernel module and rr works like a charm | 10:52 | ||
| sena_kun | jnthnwrthngtn, github.com/rr-debugger/rr/wiki/Zen says it should work. :/ | ||
| jnthnwrthngtn | Oh. When I ran rr it pointed me to a github issue about it, when I read through, and saw no mention of that :) | 11:03 | |
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| jnthnwrthngtn | Current NQP HEAD compiles call and callmethod QAST nodes into dispatch instructions. | 14:22 | |
| It builds. 3 failing tests, 2 a bug I need to hunt, 1 an NYI. Also an intermittent hang that I'm looking at now. | 14:23 | ||
| I also discovered that the QAST regex compiler will need updating since it directly emits findmeth/invoke. There are likely some other such places to update too | 14:26 | ||
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| moon-child | nine: that reminds me of the jvm XXXalot flags they use for testing | 21:04 | |
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