[Bug rust/30660] New: segfault on invalid char while printing array

[Bug rust/30660] New: segfault on invalid char while printing array

[shivanib134 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=30660

            Bug ID: 30660
           Summary: segfault on invalid char while printing array
           Product: gdb
           Version: 12.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: rust
          Assignee: unassigned at sourceware dot org
          Reporter: shivanib134 at gmail dot com
  Target Milestone: ---

Hello!

Recently, while debugging an array slice which was passed by C to Rust
function, I tried to print the array and the result was:


(gdb) p cur_i
$1 = &[u8] {
  data_ptr: 0x621000035d00,
  length: 2896
}

but then, I wanted to see the first 10 bytes in the data_ptr and didn't
remember the syntax, so, I did

(gdb) p *cur_i.data_ptr@[10]

while this is very incorrect, I was hoping for errors to lead me to the correct
syntax. But, this resulted in the following error:

(gdb) p *cur_i.data_ptr@[10]


Fatal signal: Segmentation fault
----- Backtrace -----
0x555d903a0077 ???
0x555d904a2859 ???
0x555d904a2a22 ???
0x7f0dea04251f ???
        ./signal/../sysdeps/unix/sysv/linux/x86_64/libc_sigaction.c:0
0x555d9036c863 ???
0x555d9049c827 ???
0x555d905bf79f ???
0x555d905bfcef ???
0x555d903d5654 ???
0x555d906cb394 ???
0x555d904a39a4 ???
0x555d904a3d43 ???
0x555d904a44c6 ???
0x7f0deb47de0d ???
0x555d904a2a95 ???
0x555d904a4374 ???
0x555d904a268b ???
0x555d90854815 ???
0x555d90854caa ???
0x555d9056036c ???
0x555d90562054 ???
0x555d902f815f ???
0x7f0dea029d8f __libc_start_call_main
        ../sysdeps/nptl/libc_start_call_main.h:58
0x7f0dea029e3f __libc_start_main_impl
        ../csu/libc-start.c:392
0x555d902fdbf4 ???
0xffffffffffffffff ???
---------------------
A fatal error internal to GDB has been detected, further
debugging is not possible.  GDB will now terminate.

This is a bug, please report it.  For instructions, see:
<https://www.gnu.org/software/gdb/bugs/>.

Segmentation fault (core dumped)


Please note that when I tried the same syntax on an array in C, I got the
error:

(gdb) p *input@[10]
A syntax error in expression, near `[10]'.

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[Bug rust/30660] segfault on invalid char while printing array

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=30660

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |tromey at sourceware dot org
         Resolution|---                         |DUPLICATE

--- Comment #1 from Tom Tromey <tromey at sourceware dot org> ---
I looked into this and it turns out to be a dup, fixed in 14.1.

*** This bug has been marked as a duplicate of bug 30410 ***

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