[llvm-dev] llvm symbolizer not able to parse debuginfo files

[Ashish Sangwan via llvm-dev]

*ping*

On Mon, Mar 18, 2019 at 3:59 PM Ashish Sangwan <ashishsangwan2 at gmail.com> wrote:
>
> I am trying to run NFS-Ganesha with ASAN in our setup. I am having
> difficulties to make llvm symbolizer print symbol names from the
> .debug binaries/libraries, once ASAN shows any error;
>
> bash-4.2# /opt/rh/llvm-toolset-7/root/usr/bin/llvm-symbolizer --version
> LLVM (http://llvm.org/):
>   LLVM version 5.0.1
>   Optimized build.
>   Default target: x86_64-unknown-linux-gnu
>   Host CPU: nocona
>
> I am getting the following error (The addr2line is working ok, also
> gdb is able to parse these files):
> python asan_symbolize.py  < asan.log.173664
> =================================================================
> ==173664== ERROR: AddressSanitizer: heap-use-after-free on address
> 0x60040002ff90 at pc 0x7f83d22f91bb bp 0x7f83c17f3e40 sp
> 0x7f83c17f3e30
> WRITE of size 4 at 0x60040002ff90 thread T12
>     #0 0x7f83d22f91ba
> (/usr/lib/debug/usr/lib64/ganesha/libfsalminerva.so.4.2.0.debug+0x251ba)
>
> /opt/rh/llvm-toolset-7/root/usr/bin/llvm-symbolizer
> --use-symbol-table=true --demangle=False --inlining=true
> --default-arch=i386
> "/usr/lib/debug/usr/lib64/ganesha/libfsalminerva.so.4.2.0.debug" 0x251ba
> LLVMSymbolizer: error reading file: Invalid data was encountered while
> parsing the file
> addr2line -fi -e /usr/lib/debug/usr/lib64/ganesha/libfsalminerva.so.4.2.0.debug
> "/usr/lib/debug/usr/lib64/ganesha/libfsalminerva.so.4.2.0.debug" 0x251ba
>     #0 0x7f83d22f91ba in minerva_mkdir
> /usr/src/debug/nfs-ganesha-2.7.1/FSAL/FSAL_MINERVA/handle.c:747
>
> How can I fix this?
>
> I googled a bit about using the debug binaries/libraries with
> llvm-symbolizer/asan_symbolize.py, I found that there was a patch
> proposed:
> https://reviews.llvm.org/D4902
> But this was discarded saying:
> "
> This logic is already implemented in the symbolization tools, if you
> want them to work with custom sysroot (so that debug versions of
> binaries could be found at /path/to/my/sysroot/usr/lib/debug), just
> add the --sysroot flag to the tools
> "
> Apart from the parsing error mentioned above, I have couple of other concerns:
> a) I have to manually append .debug to all the binaries/libraries for
> which I have a corresponding .debug image in the asan.logfile
> b) The sysroot parameter cannot be used when all the libraries used by
> the applications does not have corresponding .debug versions, for
> example, in our setup libc does not have .debug version, in that case
> I have to replace the entire path of entities which have .debug images
> otherwise the symbolizer fails with no such file for libc.
>
> Is there a way to do this more easily? (I hope I am asking the
> question on correct list, please point me to
> the correct list otherwise.)
> Thanks!
> Ashish