Did you actually see a case where full debug info is that important? In the 5 years of asan existence I've never needed to debug an asan report with a debugger. 
(I am just curious and am not against this feature)

I'm trying to debug  bug 636558 , and I wanted debug info to know:

- What is the layout of WTF::StringImpl. I looked at the class to figure this out myself, but debug info will do this for you.

- What is the real value of 'n'. I got this with printf debugging.

Maybe the default should stay as -gline-tables-only because it noticeably speeds up the build, which is often the first step to reproducing an asan report, but right now there is no way to get full debug info with asan in gn (or so I think).

Is the problem that is_asan=true is setting -gline-tables-only unconditionally and overriding symbol_level=2 (i.e., -g2)?

Because I think that's what would happen, and, if so, we should just fix that rather than add a fourth symbol level.

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

Sorry for the inconvenience if the bug really should have been left as Available. If you change it back, also remove the "Hotlist-Recharge-Cold" label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot