Perl 6 - the future is here, just unevenly distributed

IRC log for #moarvm, 2017-03-01

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All times shown according to UTC.

Time Nick Message
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02:48 Topic for #moarvm is now https://github.com/moarvm/moarvm | IRC logs at  http://irclog.perlgeek.de/moarvm/today
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06:47 nwc10 Overnight I had this one again:
06:47 nwc10 ===(       0;61  0/1  23/40  0/?  0/1  0/?  0/?  0/?  31/1610  42/42  Unhandled exception in code scheduled on thread 16
06:47 nwc10 Deocder may not be used concurrently
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09:21 nwc10 and again
09:28 brrt good moarning
09:34 dogbert17 o/ brrt
09:34 dogbert17 also got the dreaded deocder error during the night
09:59 dogbert17 got the deocder error again but this time I had a breakpoint in gdb
10:03 dogbert17 https://gist.github.com/dogbert17/4500c121465c23b9cf35608cea06f31c
10:07 brrt i don't really have the background knowledge to judge that appropraitely
10:12 jnthn Well, interesting...
10:12 jnthn Increases my confidence we can reproduce it with something smaller, though
10:24 dogbert17 I can see what two other threads are doing, one is in 'MVM_frame_find_invokee_multi_ok' and the other in 'gc_free'
10:27 jnthn Are there any other in the decoder, though?
10:28 jnthn apply all threads bt
10:28 dogbert17 (gdb) bt
10:28 dogbert17 Python Exception <class 'gdb.MemoryError'> Cannot access memory at address 0x37ff0b56:
10:29 dogbert17 that also happens with 'apply all threads bt'
10:29 jnthn wat
10:30 jnthn Python?!
10:30 dogbert17 beats me, probably some plugin stuff for gdb
10:30 dogbert17 I'll check all threads individually ...
10:31 jnthn Hopefully another one will be in the decoder also
10:34 dogbert17 I can see all except three (the show the python error) and the all say roughly this '#0  0x40024cb0 in ?? ()'
10:34 dogbert17 #1  0x400ff3d2 in start_thread (data=0x42ac6828) at src/core/threads.c:80
10:35 brrt oh, that's not so surprising, the python exception
10:35 dogbert17 brrt, please elaborate
10:35 brrt you probably have the 'helper' module loaded
10:35 brrt and it can't access memory it's trying to print
10:35 brrt tools/moar-gdb.py
10:36 dogbert17 what do you suggest
10:37 brrt that is probably trying to look at invalid memory
10:37 brrt one thing you can try is to remove the moar-gdb.py script from $wherever-it-was-installed
10:38 brrt and see if that helps
10:39 dogbert17 do you know if I can query gdb to see what helpers have been loaded?
10:40 brrt no, i don't
10:43 dogbert17 it hasn't loaded tools/moar-gdb.py it seems, maybe it should
10:43 dogbert17 in gdb I wrote 'info auto-load python-scripts'
10:43 brrt hmmm
10:43 brrt then it's probably some other python thingy
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11:09 * dogbert17 rerunning tests again, this time with --no-optimize
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13:56 timotimo moar is not the only place where exceptions don't get their backtrace printed sometimes :\
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14:40 dogbert17 the bug(s) have gone into hiding atm ...
14:54 dogbert17 now I got the 'output-ruler' bug again
14:55 IOninja .oO( One output to rule them all... )
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17:47 TimToady wouldn't it be funny if we turned out to be debugging the GIL there...
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22:23 MasterDuke has anybody looked at heaptrack ( https://www.kdab.com/heaptrack-v1-0-0-release/ )? think it would be useful?
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