[Bug gdb/23256] Using GDB to patch a binary results in GDB crash

["ppluzhnikov at google dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23256

--- Comment #1 from Paul Pluzhnikov <ppluzhnikov at google dot com> ---
Using current trunk (b15fe636afad8bfef76940823bed96f2c1860c30):

(gdb) set *(char*)0x5fa = 0xcc
(gdb) q

Program received signal SIGSEGV, Segmentation fault.
_bfd_elf_strtab_finalize (tab=0x0) at ../../bfd/elf-strtab.c:367
367       amt *= sizeof (struct elf_strtab_hash_entry *);
(gdb-top) bt
#0  _bfd_elf_strtab_finalize (tab=0x0) at ../../bfd/elf-strtab.c:367
#1  0x0000555555a0b8a7 in _bfd_elf_assign_file_positions_for_non_load
(abfd=0x5555563de170) at ../../bfd/elf.c:6363
#2  _bfd_elf_write_object_contents (abfd=0x5555563de170) at
../../bfd/elf.c:6399
#3  0x00005555559ecf0a in bfd_close (abfd=abfd@entry=0x5555563de170) at
../../bfd/opncls.c:731
#4  0x000055555587318c in gdb_bfd_close_or_warn (abfd=0x5555563de170) at
../../gdb/gdb_bfd.c:511
#5  gdb_bfd_unref (abfd=0x5555563de170) at ../../gdb/gdb_bfd.c:615
#6  0x000055555577e7a9 in exec_close () at ../../gdb/exec.c:115
#7  0x000055555577e852 in exec_target::close (this=<optimized out>) at
../../gdb/exec.c:142
#8  0x00005555559610f2 in target_close (targ=<optimized out>) at
../../gdb/target.c:3379
#9  0x00005555559611f8 in unpush_target (t=<optimized out>) at
../../gdb/target.c:711
#10 0x0000555555961249 in unpush_target_and_assert (target=0x555556121840
<exec_ops>) at ../../gdb/target.c:721
#11 0x00005555559612ed in pop_all_targets_above (above_stratum=dummy_stratum)
at ../../gdb/target.c:735
#12 pop_all_targets () at ../../gdb/target.c:750
#13 0x0000555555973e00 in quit_force (exit_arg=exit_arg@entry=0x0,
from_tty=from_tty@entry=1) at ../../gdb/top.c:1625
#14 0x00005555556f1e09 in quit_command (args=<optimized out>, from_tty=1) at
../../gdb/cli/cli-cmds.c:349
#15 0x00005555556f7f02 in cmd_func (cmd=<optimized out>, args=<optimized out>,
from_tty=<optimized out>) at ../../gdb/cli/cli-decode.c:1857
#16 0x0000555555972e95 in execute_command (p=<optimized out>,
p@entry=0x5555564295d0 "q", from_tty=1) at ../../gdb/top.c:630
#17 0x000055555586363c in command_handler (command=0x5555564295d0 "q") at
../../gdb/event-top.c:583
#18 0x00005555558639aa in command_line_handler (rl=<optimized out>) at
../../gdb/event-top.c:774
#19 0x000055555586283c in gdb_rl_callback_handler (rl=0x555556429930 "") at
../../gdb/event-top.c:213
#20 0x00005555559cdbcf in rl_callback_read_char () at
../../readline/callback.c:220
#21 0x0000555555862786 in gdb_rl_callback_read_char_wrapper_noexcept () at
../../gdb/event-top.c:175
#22 0x00005555558627e9 in gdb_rl_callback_read_char_wrapper
(client_data=<optimized out>) at ../../gdb/event-top.c:192
#23 0x0000555555862d10 in stdin_event_handler (error=<optimized out>,
client_data=0x5555561591d0) at ../../gdb/event-top.c:511
#24 0x0000555555861ae5 in gdb_wait_for_event (block=block@entry=1) at
../../gdb/event-loop.c:859
#25 0x0000555555861c52 in gdb_do_one_event () at ../../gdb/event-loop.c:347
#26 0x0000555555861dce in gdb_do_one_event () at ../../gdb/event-loop.c:304
#27 start_event_loop () at ../../gdb/event-loop.c:371
#28 0x00005555558c4e38 in captured_command_loop () at ../../gdb/main.c:330
#29 0x00005555558c5ded in captured_main (data=<optimized out>) at
../../gdb/main.c:1157
#30 gdb_main (args=<optimized out>) at ../../gdb/main.c:1173
#31 0x0000555555670d0b in main (argc=<optimized out>, argv=<optimized out>) at
../../gdb/gdb.c:32

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