asan fails to unwind from memcmp

[ramosian-glider]

Originally reported on Google Code with ID 46

clang -faddress-sanitizer    output_tests/memcmp_test.cc && ./a.out  2>&1 | ./scripts/asan_symbolize.py
/

READ of size 1 at 0x7fffb2721024 thread T0
    #0 0x407fcd in memcmp _asan_rtl_
    #1 0x402140 in _start ??:0

The second frame should be main(). 

I guess this is because asan-rt is built w/o frame pointers.
I wonder if we can fix it w/o using frame pointers. 

Reported by konstantin.s.serebryany on 2012-03-13 01:12:40

[ramosian-glider]

I thought -funwind-tables is enough. Do you have the .eh_frame section in your binary?

BTW any reason for us not to use frame pointers? The overhead is minor, especially
compared to debugging benefits.

Reported by ramosian.glider on 2012-03-13 07:54:20

[ramosian-glider]

I thought we use fast unwind on linux, why do we need unwind tables?

Reported by eugenis@google.com on 2012-03-13 08:30:51

[ramosian-glider]

Ah, your're right. Unwind tables are used for exceptions, so we still need them, but
they have nothing to do with stack unwinding in the runtime.

Reported by ramosian.glider on 2012-03-13 09:02:58

[ramosian-glider]

Should be fixed by r152768.
We don't need nor want frame pointers in asan-rt. 

Reported by konstantin.s.serebryany on 2012-03-15 01:41:39

• Status changed: Fixed

[ramosian-glider]

Adding Project:AddressSanitizer as part of GitHub migration.

Reported by ramosian.glider on 2015-07-30 09:12:58

• Labels added: ProjectAddressSanitizer