[Lightning] stack alignment trouble

[Laurent Michel]

Hi again,

I'm having stack alignment problems under OSX. Here is the crash backtrace:

0   dyld                           0x8fe18b42 misaligned_stack_error + 0

1   runtime.dylib                 0x00dcee33 LocRTShared::createRandomStreams(int) + 81 (LocRuntime.C:294)

2   runtime.dylib                 0x00dd0678 LocRuntime::createRandomStreams(int) + 30 (LocRuntime.C:700)

3   runtime.dylib                 0x00dfc4bd LocInstrSetNbRandomStreamsI::execute(LocRuntime*) + 27 (LocInstrI.C:242)

4   runtime.dylib                 0x00e415ca __execInstrWrapper(LocInstrI*, LocRuntime*) + 32 (CotJit.C:541)

5   ???                           0x20346f52 0 + 540307282

6   org.comet-online.comet         0x0012897d ColPtrRoots::execute() + 59 (comet.C:386)

7   org.comet-online.comet         0x0012aac4 stdMain(CmdLineOptions&, int, char**) + 4620 (comet.C:579)

8   org.comet-online.comet         0x0012c988 ColCometThread::startup() + 40 (comet.C:668)

9   thread-posix.dylib             0x0072d330 Thread::real_startup(Thread*) + 130 (c++thread.cc:153)

10  libSystem.B.dylib             0x911d26f5 _pthread_start + 321

11  libSystem.B.dylib             0x911d25b2 thread_start + 34

Frame 5 is of course a bit of machine code generated by lightning.  A bit later on a function finds the stack misaligned and blows up. The version I was using (1.1.2 + homegrown patches) had provisions for 16-byte stack alignment in the prepare instructions. 

I will try to diagnose and possibly port my changes over to the head revision from git. If it works well, I'll post. 

--

  Laurent

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