[Bug backtrace/31560] New: Segfault when computing backtrace

["wingo at igalia dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31560

            Bug ID: 31560
           Summary: Segfault when computing backtrace
           Product: gdb
           Version: 14.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: backtrace
          Assignee: unassigned at sourceware dot org
          Reporter: wingo at igalia dot com
  Target Milestone: ---

Hi,

Using gdb 14.1 from Guix, I get a segfault in GDB while printing a backtrace,
either when traversing a core file or attached to a live process.  The specific
process is part of the V8 test suite (with some patches from me).  gdb 12.1
successfully prints the backtrace.

The backtrace of GDB:

```
(gdb) bt
#0  block::scope (this=<optimized out>) at ../../gdb-14.1/gdb/block.c:293
#1  0x000000000055b6b7 in cp_lookup_transparent_type (name=0x85e4b00
"v8::internal::ExternalPointerTable::Space") at
../../gdb-14.1/gdb/cp-namespace.c:1029
#2  0x0000000000627b1d in check_typedef (type=<optimized out>,
type@entry=0x76f7780) at ../../gdb-14.1/gdb/gdbtypes.c:3052
#3  0x00000000005134dc in c_value_print_ptr (options=0x7fffffffda30, recurse=2,
stream=0x7fffffffdb10, val=0xf0ce9e0) at ../../gdb-14.1/gdb/c-valprint.c:352
#4  c_value_print_inner (val=0xf0ce9e0, stream=0x7fffffffdb10, recurse=2,
options=0x7fffffffda30) at ../../gdb-14.1/gdb/c-valprint.c:435
#5  0x00000000008941bb in common_val_print (value=0xf0ce9e0,
stream=0x7fffffffdb10, recurse=2, options=0x7fffffffdae0, language=0xd73150
<cplus_language_defn>) at ../../gdb-14.1/gdb/valprint.c:1092
#6  0x00000000008942ec in common_val_print_checked (val=<optimized out>,
stream=<optimized out>, recurse=<optimized out>, options=<optimized out>,
language=<optimized out>) at ../../gdb-14.1/gdb/valprint.c:1184
#7  0x00000000007e5d8a in print_frame_arg (fp_opts=...,
arg=arg@entry=0x7fffffffdbd0) at ../../gdb-14.1/gdb/stack.c:487
#8  0x00000000007ea0c2 in print_frame_args (fp_opts=..., func=<optimized out>,
frame=..., num=-1, stream=0xdb8d20) at ../../gdb-14.1/gdb/stack.c:883
#9  0x00000000007ed950 in print_frame (sal=..., print_args=1,
print_what=LOCATION, print_level=<optimized out>, frame=..., fp_opts=...) at
../../gdb-14.1/gdb/stack.c:1382
#10 print_frame_info (fp_opts=..., frame=..., print_level=<optimized out>,
print_what=LOCATION, print_args=1, set_current_sal=0) at
../../gdb-14.1/gdb/stack.c:1108
#11 0x00000000007eec00 in backtrace_command_1 (from_tty=1, count_exp=<optimized
out>, bt_opts=..., fp_opts=...) at ../../gdb-14.1/gdb/stack.c:2062
#12 backtrace_command (arg=<optimized out>, from_tty=1) at
../../gdb-14.1/gdb/stack.c:2168
#13 0x00000000005220e5 in cmd_func (cmd=<optimized out>, args=<optimized out>,
from_tty=<optimized out>) at ../../gdb-14.1/gdb/cli/cli-decode.c:2735
#14 0x000000000084e1c7 in execute_command (p=<optimized out>, p@entry=0xdb8f10
"bt", from_tty=1) at ../../gdb-14.1/gdb/top.c:575
#15 0x00000000005f5140 in command_handler (command=0xdb8f10 "bt") at
../../gdb-14.1/gdb/event-top.c:552
#16 0x00000000005f62ee in command_line_handler (rl=...) at
../../gdb-14.1/gdb/event-top.c:788
#17 0x00000000005f5a3c in gdb_rl_callback_handler (rl=0x162d090 "bt") at
../../gdb-14.1/gdb/event-top.c:259
#18 0x00000000008c8a98 in rl_callback_read_char () at
../../../gdb-14.1/readline/readline/callback.c:290
#19 0x00000000005f4cee in gdb_rl_callback_read_char_wrapper_noexcept () at
../../gdb-14.1/gdb/event-top.c:195
#20 0x00000000005f592d in gdb_rl_callback_read_char_wrapper
(client_data=<optimized out>) at ../../gdb-14.1/gdb/event-top.c:234
#21 0x000000000087e7a0 in stdin_event_handler (error=<optimized out>,
client_data=0xdb8c00) at ../../gdb-14.1/gdb/ui.c:155
#22 0x00000000009c783e in gdb_wait_for_event (block=block@entry=1) at
../../gdb-14.1/gdbsupport/event-loop.cc:694
#23 0x00000000009c81de in gdb_wait_for_event (block=1) at
../../gdb-14.1/gdbsupport/event-loop.cc:593
#24 gdb_do_one_event (mstimeout=mstimeout@entry=-1) at
../../gdb-14.1/gdbsupport/event-loop.cc:264
#25 0x00000000006dae5a in start_event_loop () at ../../gdb-14.1/gdb/main.c:407
#26 captured_command_loop () at ../../gdb-14.1/gdb/main.c:471
#27 0x00000000006dcd85 in captured_main (data=data@entry=0x7fffffffe590) at
../../gdb-14.1/gdb/main.c:1324
#28 gdb_main (args=args@entry=0x7fffffffe5d0) at ../../gdb-14.1/gdb/main.c:1343
#29 0x0000000000442e65 in main (argc=3, argv=0x7fffffffe718) at
../../gdb-14.1/gdb/gdb.c:39
```

-- 
You are receiving this mail because:
You are on the CC list for the bug.