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Re: LLDB “Couldn’t materialize” errors when Address Sanitizer is on
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Re: LLDB “Couldn’t materialize” errors when Address Sanitizer is on

  • Subject: Re: LLDB “Couldn’t materialize” errors when Address Sanitizer is on
  • From: Kuba Mracek <email@hidden>
  • Date: Wed, 07 Sep 2016 14:39:04 +0200
Address Sanitizer changes the way local variables are represented on the stack (to protect from stack buffer overflows), so this might be a bug in the debug info generation.  If you can provide a small reproducer, then please file a bug at bugreport.apple.com.

Also, is "size" a local variable or is it an instance variable of a C++ object?  Is the issue only present in C++ code?

Thanks,
Kuba

On 7 Sep 2016, at 01:23, Jens Alfke <email@hidden> wrote:

In the latest Xcode 8 beta, while debugging I’m getting a lot of those dreaded “Couldn’t materialize” errors from LLDB, where it can’t get the value of a variable. To be precise, the variable’s value doesn’t show up in the variables pane, and when I try to print it with LLDB I get:

(lldb) p size
error: Couldn't materialize: couldn't get the value of variable size: variable not available
error: errored out in DoExecute, couldn't PrepareToExecuteJITExpression

This is intermittent, but it happens even in debug builds, when I’m stopped at an ordinary breakpoint (not crashed).
It does seem to go away if I turn off the Address Sanitizer, but for obvious reasons I prefer to leave that on when I’m debugging.

Anyone else getting a lot of these in Xcode 8? Is it known to Apple yet?

—Jens

PS: Xcode 8 beta 6, latest macOS Sierra beta, building a Mac target, debugging C++ code.

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