[Bug gdb/30431] segfault when inspecting remote variable

["marian.buschsieweke at posteo dot net" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30431

Marian Buschsieweke <marian.buschsieweke at posteo dot net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #14870|0                           |1
        is obsolete|                            |

--- Comment #6 from Marian Buschsieweke <marian.buschsieweke at posteo dot net> ---
Created attachment 14914
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14914&action=edit
hello-world.elf (new version)

Thx for your reply and sorry for the long latency. I can still reproduce the
issue; using a new ELF file this time (see attachment).

    $ gdb gdb-multiarch
    [...]
    (gdb) run -nx bin/olimex-msp430-h1611/hello-world.elf 
    [...]
    For help, type "help".
    Type "apropos word" to search for commands related to "word"...
    Reading symbols from bin/olimex-msp430-h1611/hello-world.elf...
    (gdb) set remotelogfile /home/maribu/remotelogfile
    (gdb) tar rem :2000
    Remote debugging using :2000
    __crt0_start () at
/home/buildozer/aports/community/newlib/src/newlib-4.3.0.20230120/libgloss/msp430/crt0.S:56
    56 
/home/buildozer/aports/community/newlib/src/newlib-4.3.0.20230120/libgloss/msp430/crt0.S:
No such file or directory.
    (gdb) p BCSCTL1 

    Thread 1 "gdb-multiarch" received signal SIGSEGV, Segmentation fault.
    0x000055555586ae9a in language_defn::read_var_value (this=<optimized out>,
var=0x7ffff6acaec0, var_block=0x7ffff6a36b70, frame=...) at
../../gdb/findvar.c:756
    756 ../../gdb/findvar.c: No such file or directory.
    (gdb) bt
    #0  0x000055555586ae9a in language_defn::read_var_value (this=<optimized
out>, var=0x7ffff6acaec0, var_block=0x7ffff6a36b70, frame=...) at
../../gdb/findvar.c:756
    #1  0x0000555555867c1f in read_var_value (var=var@entry=0x7ffff6acaec0,
var_block=var_block@entry=0x7ffff6a36b70, frame=...) at ../../gdb/findvar.c:794
    #2  0x0000555555cbf5e8 in value_of_variable (var=var@entry=0x7ffff6acaec0,
b=0x7ffff6a36b70) at ../../gdb/valops.c:1385
    #3  0x000055555583e2db in evaluate_var_value (var=0x7ffff6acaec0,
blk=<optimized out>, noside=EVAL_NORMAL) at ../../gdb/eval.c:559
    #4  expr::var_value_operation::evaluate (this=0x7ffff6a9ee70,
expect_type=<optimized out>, exp=<optimized out>, noside=EVAL_NORMAL) at
../../gdb/eval.c:585
    #5  0x000055555583e37d in expression::evaluate (this=0x7ffff6a9edd0,
expect_type=0x0, noside=noside@entry=EVAL_NORMAL) at ../../gdb/eval.c:101
    #6  0x000055555583e6f7 in evaluate_expression (exp=<optimized out>,
expect_type=<optimized out>) at ../../gdb/eval.c:115
    #7  0x0000555555a84d91 in process_print_command_args (args=<optimized out>,
print_opts=print_opts@entry=0x7fffffffdfa0, voidprint=voidprint@entry=true)
        at /usr/include/c++/13.1.1/bits/unique_ptr.h:199
    #8  0x0000555555a85d80 in print_command_1 (args=<optimized out>,
voidprint=1) at ../../gdb/printcmd.c:1319
    #9  0x0000555555732f9d in cmd_func (cmd=<optimized out>, args=<optimized
out>, from_tty=<optimized out>) at ../../gdb/cli/cli-decode.c:2543
    #10 0x0000555555c6fbb0 in execute_command (p=<optimized out>,
p@entry=0x7ffff70abac0 "p BCSCTL1 ", from_tty=<optimized out>) at
../../gdb/top.c:690
    #11 0x00005555558454cd in command_handler (command=0x7ffff70abac0 "p
BCSCTL1 ") at ../../gdb/event-top.c:616
    #12 0x0000555555846ddd in command_line_handler (rl=...) at
../../gdb/event-top.c:852
    #13 0x0000555555845a24 in gdb_rl_callback_handler (rl=0x7ffff70aba90 "p
BCSCTL1 ") at ../../gdb/event-top.c:246
    #14 0x00007ffff7ddfc86 in rl_callback_read_char () from
/usr/lib/libreadline.so.8
    #15 0x0000555555845b6e in gdb_rl_callback_read_char_wrapper_noexcept () at
../../gdb/event-top.c:188
    #16 0x0000555555845ce0 in gdb_rl_callback_read_char_wrapper
(client_data=<optimized out>) at ../../gdb/event-top.c:221
    #17 0x0000555555844bf8 in stdin_event_handler (error=<optimized out>,
client_data=0x7ffff7f04e70) at ../../gdb/event-top.c:541
    #18 0x00005555561a5f6c in gdb_wait_for_event (block=block@entry=1) at
../../gdbsupport/event-loop.cc:716
    #19 0x00005555561a68f0 in gdb_wait_for_event (block=1) at
../../gdbsupport/event-loop.cc:593
    #20 gdb_do_one_event (mstimeout=mstimeout@entry=-1) at
../../gdbsupport/event-loop.cc:264
    #21 0x000055555599fb6a in start_event_loop () at ../../gdb/main.c:411
    #22 captured_command_loop () at ../../gdb/main.c:471
    #23 0x00005555559a1ac5 in captured_main (data=data@entry=0x7fffffffe420) at
../../gdb/main.c:1330
    #24 gdb_main (args=args@entry=0x7fffffffe450) at ../../gdb/main.c:1345
    #25 0x00005555555d4e6a in main (argc=<optimized out>, argv=<optimized out>)
at ../../gdb/gdb.c:32

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