unable to debug malloc_shared with gdb

[alexbatashev]

Discussed in #4330

^{Originally posted by guoyejun August 13, 2021}
Hi,

I'm trying the hello world code of DPCPP book, and I tried the code at https://github.com/Apress/data-parallel-CPP/blob/main/samples/Ch01_intro/fig_1_1_hello.cpp, but met crash when debug the program with gdb, see below. I also tried with .../intel/oneapi/debugger/10.1.2/gdb/intel64/bin/gdb-oneapi, the same issue.

$ dpcpp -g fig_1_1_hello.cpp
$ gdb ./a.out
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Reading symbols from ./a.out...
(gdb) r
Starting program: /home/yjguo/work/ooo/dpcpp/a.out
warning: File "/home/yjguo/intel/oneapi/compiler/2021.3.0/linux/lib/libsycl.so.5.2.0-gdb.py" auto-loading has been declined by your `auto-load safe-path' set to "$debugdir:$datadir/auto-load".
To enable execution of this file add
        add-auto-load-safe-path /home/yjguo/intel/oneapi/compiler/2021.3.0/linux/lib/libsycl.so.5.2.0-gdb.py
line to your configuration file "/home/yjguo/.gdbinit".
To completely disable this security protection add
        set auto-load safe-path /
line to your configuration file "/home/yjguo/.gdbinit".
For more information about this security protection see the
"Auto-loading safe path" section in the GDB manual.  E.g., run from the shell:
        info "(gdb)Auto-loading safe path"
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7ffff31e3700 (LWP 64327)]
[New Thread 0x7ffff1bd9700 (LWP 64328)]

Thread 1 "a.out" received signal SIGSEGV, Segmentation fault.
__strlen_avx2 () at ../sysdeps/x86_64/multiarch/strlen-avx2.S:65
65      ../sysdeps/x86_64/multiarch/strlen-avx2.S: No such file or directory.
(gdb) bt
#0  __strlen_avx2 () at ../sysdeps/x86_64/multiarch/strlen-avx2.S:65
#1  0x00007ffff7f02b1e in std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*) () from /lib/x86_64-linux-gnu/libstdc++.so.6
#2  0x00000000004037ef in main () at fig_1_1_hello.cpp:25
(gdb) f 2
#2  0x00000000004037ef in main () at fig_1_1_hello.cpp:25
25        std::cout << result << "\n";
(gdb) p result
$1 = 0x7ffff0c00000 "Ifmmp-!xpsme\"\nJ(n!tpssz-!Ebwf/!J(n!bgsbje!J!dbo(u!ep!uibu/!.!IBM\001"
(gdb)

btw, Intel gpu is selected by the queue as default.

[alexbatashev]

@mihails-strasuns-intel FYI

[alexbatashev]

See resolution here: #4330 (comment)