[lldb-dev] LLDB deadlocks trying to unwind

[Jason Molenda]

On Aug 22, 2013, at 1:26 PM, Félix Cloutier <felixcca at yahoo.ca> wrote:

> #5	lldb_private::Mutex::Locker::Locker(lldb_private::Mutex&) at lldb/source/Host/common/Mutex.cpp:113
> #6	lldb_private::Unwind::GetFrameCount() at lldb/include/lldb/Target/Unwind.h:51
> #7	UnwindMacOSXFrameBackchain::DoGetFrameInfoAtIndex(unsigned int, unsigned long long&, unsigned long long&) at lldb/source/Plugins/Process/Utility/UnwindMacOSXFrameBackchain.cpp:59
> #8	lldb_private::Unwind::GetFrameInfoAtIndex(unsigned int, unsigned long long&, unsigned long long&) at lldb/include/lldb/Target/Unwind.h:78
> #9	lldb_private::StackFrameList::GetFramesUpTo(unsigned int) at lldb/source/Target/StackFrameList.cpp:304


I'll look at this a bit.

The fact that you're picking up the UnwindMacOSXFrameBackchain is probably the source of the problem.  This was an early unwinder written by Greg back before we had UnwindLLDB and RegisterContextLLDB - it hasn't been modified in a couple of years except for mechanical changes made across the source base.