LLDB kernel panic on OSX

Subprojects LLDB
#1

Hello,

I’ve tried building the latest LLDB + LLVM from trunk on two different OSX machines running Lion (10.7.5) and the resulting lldb binary seems to cause a kernel panic when run. I’m not an OSX developer normally so it’s quite possible that I’m doing something wrong and I’m wondering if anyone has any pointers.

I have tried with both clang 3.2 (the default for Xcode 4.6) as well as clang 3.3 from MacPorts with the following configure line:

./configure --enable-optimized --enable-assertions --enable-cxx11 --enable-libcpp

The lldb binary can be run but crashes when trying to launch a process.

lldb /usr/bin/python

(lldb) r

Any ideas are welcome.

Thanks,
Andrew

#2

Try modifying the function in Host.mm:

static short GetPosixspawnFlags (ProcessLaunchInfo &launch_info)

by commenting out the following lines:

#ifdef POSIX_SPAWN_CLOEXEC_DEFAULT
    // Close all files exception those with file actions if this is supported.
    flags |= POSIX_SPAWN_CLOEXEC_DEFAULT;
#endif

Using this flag used to cause kernel panics. Maybe it still does on 10.7? Let me know if this fixes things and if it does, then I will place a dynamic MacOSX version check for 10.8 and above.

Greg

#3

Hi Greg,

That was exactly it, removing those lines makes the kernel panic go away.

Thanks for the help!

Andrew

#4

Try top of tree with no modifications now:

% svn commit
Sending source/Host/macosx/Host.mm
Transmitting file data .
Committed revision 198776.

I added dynamic OS version checking and we don't use the flag for 10.7 and earlier.

Greg

#5

No crash anymore on top of tree, looks good!