Incorrect values in debugger when Address Sanitization is on
Incorrect values in debugger when Address Sanitization is on
- Subject: Incorrect values in debugger when Address Sanitization is on
- From: Jens Alfke <email@hidden>
- Date: Wed, 13 Jan 2016 11:01:35 -0800
I just had a weird problem in the debugger where it was showing nonsensical values for some variables. I was able to convince myself that the actual variables had correct values, by adding a printf call:
body is at 0x7fff5fbfd090
(lldb) p &body
(cbforest::slice *) $0 = 0x00007fff5fbfcad0
Turning off Address Sanitization made the problem go away. Looks as though it was causing incorrect info in the dSYM file.
(This is a 64-bit Mac OS target, a mix of Obj-C and C++. The function where the problem occurs is C++. The variables having the trouble all appear to be small structs. Xcode 7.2 7C68.)
I can file a bug report, but I don’t think it’ll help much since (a) this is a pretty big project, ~50kloc, and (b) I’ve never seen this happen before so it’s probably specific to some particular thing I’m doing and would be difficult to isolate.
Has anyone else seen this?
—Jens
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