Peter N Lewis
Michael Tsai
@peternlewis I still get those, though less often with recent versions of OS X.
So am I the only one who manages to get a (small) stream of crash reports with "BUG IN LIBDISPATCH: flawed group/semaphore logic"?
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@mjtsai what I'd love to know is - is it really a bug in libdispatch, or is it my misusing it somehow. -
@peternlewis Not sure. I’ve gotten that error in apps that didn’t call any libdispatch APIs… - View other replies
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@mjtsai I have a semi-reliable case with CFPreferences (in that, I get consistent crash reports related to a specific use of CFPreferences)
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@peternlewis The sheer number of places in semaphore.c that can emit that message makes me sad.
https://www.opensource.apple.com/source/libdispatch/libdispatch-84.5.5/src/semaphore.c … - View other replies
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@boredzo I got a bunch through CFPreferences, but occasionally see them elsewhere - no idea if the two are related. Sigh. Stumped DTS too… -
@peternlewis I wonder if@Catfish_Man would know anything about that. -
@boredzo@peternlewis would be happy to look at some crash logs -
@catfish_man@boredzo They are attached to rdar://problem/16339138. They stumped DTS and the CFPreferences guys, so I'm trying avoidance… - View other replies
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@peternlewis@boredzo I believe I know what’s going on with your test app, but I’d be surprised if it’s the same as the real one. -
@catfish_man@boredzo the test code never generated the LIBDISPATCH crash in any event. - View other replies
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@peternlewis@boredzo the test app is impressive though. Literally the first time I’ve seen that log message fire as a false positive. - Show more
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@peternlewis I have not seen any of those. -
@siegel I guess I'm just lucky - I always have had fun with chained iocompletions, err, I mean async blocks… -
@peternlewis blocks > chained iocompletions :-)
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@peternlewis (I should probably file a bug about it when I get to work…)
Petrifying Horror
David Smith
Lich Bleach-Skull
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