[cfe-dev] Debug info broken for ASan-instrumented binaries

[Kostya Serebryany]

+samsonov@


On Thu, Mar 27, 2014 at 2:46 PM, Richtarsky, Martin <
martin.richtarsky at sap.com> wrote:

> Hi,
>
> I noticed that debugging of AddressSanitizer-instrumented debug binaries
> is basically impossible since all the symbols are optimized out. It looks
> like
> there is something wrong with debug info. I'm getting the same behavior
> on 3.4 and trunk. Interestingly it works for -fsanitize=undefined. Is this
> a known
> issue? There are several related bugs but they are fixed already, e.g.
> http://llvm.org/bugs/show_bug.cgi?id=11818
>
> # cat UnitAsanStackOOB.cpp
> int main()
> {
>     const int len = 10;
>     char buffer[len];
>     char *p = &buffer[0];
>     p[len] = 1;
>     return 0;
> }
>
> # clang++ -g -o oob_trunk_add -fsanitize=address UnitAsanStackOOB.cpp
> # gdb oob_trunk_add
> GNU gdb (GDB) 7.5.1
> Reading symbols from
> /local/build/git5/sys/src/clang/AddressSanitizer/test/oob_trunk_add...done.
> (gdb) b main
> Breakpoint 1 at 0x495a4a: file UnitAsanStackOOB.cpp, line 3.
> (gdb) run
> Starting program:
> /local/build/git5/sys/src/clang/AddressSanitizer/test/oob_trunk_add
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib64/libthread_db.so.1".
> Breakpoint 1, main () at UnitAsanStackOOB.cpp:3
> 3           const int len = 10;
> (gdb) n
> 5           char *p = &buffer[0];
> (gdb) n
> 6           p[len] = 1;
> (gdb) p p
> $1 = <optimized out>
> (gdb) p len
> $2 = <optimized out>
>
> # clang++ -g -o oob_trunk_und -fsanitize=undefined UnitAsanStackOOB.cpp
> # gdb oob_trunk_und
> GNU gdb (GDB) 7.5.1
>  (gdb) b main
> Breakpoint 1 at 0x426280: file UnitAsanStackOOB.cpp, line 2.
> (gdb) run
> Starting program:
> /local/build/git5/sys/src/clang/AddressSanitizer/test/oob_trunk_und
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib64/libthread_db.so.1".
> Breakpoint 1, main () at UnitAsanStackOOB.cpp:2
> 2       {
> (gdb) n
> 3           const int len = 10;
> (gdb) n
> 5           char *p = &buffer[0];
> (gdb) n
> 6           p[len] = 1;
> (gdb) p p
> $1 = 0x7fffffff975e ""
> (gdb) p len
> $2 = 10
>
> # clang++ -v
> clang version 3.5.0 (trunk 204863)
> Target: x86_64-unknown-linux-gnu
> Thread model: posix
> Found candidate GCC installation: /usr/lib64/gcc/x86_64-suse-linux/4.3
> Selected GCC installation: /usr/lib64/gcc/x86_64-suse-linux/4.3
> Candidate multilib: .;@m64
> Candidate multilib: 32;@m32
> Selected multilib: .;@m64
>
> Best regards,
> Martin
>
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>
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