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| nwc10 | .tell jnthn I think that if an MVMCompUnitBody gets promoted to the 2nd gen, it can end up with elements of scs[] still being in the nursery, and hence not properly marked at the next nursery-only sweep | 20:34 | |
| mmm, that didn't work. | |||
| FROGGS | preflex: tell nwc10 That should do. | 20:35 | |
| ahh, no preflex here :/ | 20:36 | ||
| nwc10 | test (please ignore) | ||
| FROGGS | preflex is in #perl6 | ||
| nwc10 | and via privmesg as tell | ||
| FROGGS | k | 20:37 | |
| nwc10 | anyway, I have a stinker of a GC bug where the value 0x6 ends up as a pointer in scs[4] for a frame, which crashes gc_mark in MVMCompUnit | ||
| and it seems to be a pointer to memory in tospace which has become re-used as part of an array | 20:38 | ||
| and then that bit of memory gets misinterpreted as the forwarder address during a GC sweep, so somethign else gets updated | |||
| er, scs[4] gets update because the sweeper thinks that it's pointing to fromspace, and the fromspace has a forwarder to 0x6 | 20:39 | ||
| so I think that an even number of GC runs have happened (maybe just 2) | |||
| during which whatever scs[4] was pointing to got into fromspace, but scs[4] never got updated. Or the thing pointed to was never marked | 20:40 | ||
| oh, if all else fails, let's RTFM | |||
| nwc10 makes RTFMing noises | |||
| FROGGS | I am not sure what the solution is... the addresses of scs[4] need either temp_push'd or ASSIGN_REF'd I guess | 20:42 | |
| timotimo | don't we allocate a whole new tospace every time? | 21:57 | |
| (maybe we should) | |||
| FROGGS | no, we allocate that fromspace/tospace area just once | 21:58 | |
| we could change that for debugging reasons perhaps | 21:59 | ||
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