[Bug gdb/17051] New: GDB crash when disconnecting from and reconnecting to gdbserver

[Bug gdb/17051] New: GDB crash when disconnecting from and reconnecting to gdbserver

[simon.marchi at ericsson dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=17051

            Bug ID: 17051
           Summary: GDB crash when disconnecting from and reconnecting to
                    gdbserver
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: simon.marchi at ericsson dot com

I can make GDB crash reliably using these steps:

1- Start gdbserver with --multi
2- Connect to gdbserver
3- Specify the executable with set remote exec-file
4- Run
5- Disconnect
[inferior continues running under gdbserver...]
6- Reconnect to gdbserver
7- Witness crash

Here is a transcript from my terminal:

$ gdb a.out
Reading symbols from a.out...done.
(gdb) target extended-remote :1234
Remote debugging using :1234
(gdb) set remote exec-file /home/simark/a.out
(gdb) run &
Starting program: /home/simark/a.out 
(gdb) disconnect 
Ending remote debugging.
(gdb) target extended-remote :1234
Remote debugging using :1234
(gdb) 
[Thread 15182.15182] #1 stopped.
0x00007ffff7ad5d60 in ?? ()
../../../src/binutils-gdb/gdb/inline-frame.c:340: internal-error:
skip_inline_frames: Assertion `find_inline_frame_state (ptid) == NULL' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n)

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[Bug gdb/17051] GDB crash when disconnecting from and reconnecting to gdbserver

[xdje42 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=17051

Doug Evans <xdje42 at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |xdje42 at gmail dot com

--- Comment #1 from Doug Evans <xdje42 at gmail dot com> ---
A similar failure:

bash2$ gdbserver --multi :1234
bash1$ gdb ~/foo
(gdb) set remote exec-file ~/foo # doesn't work, but it triggers gdbserver to
exit
(gdb) tar ext :1234
(gdb) start
Temporary breakpoint 1 at 0x4007ae: main.
Starting program: /home/dje/foo
Running "~/foo" on the remote target failed

--> gdbserver exits with:
Cannot exec ~/foo: No such file or directory.

Back in gdb:

(gdb) i thr
[New Thread 10659.10659]
Remote connection closed
(gdb) set remote exec-file /home/dje/foo  # fix path (though IWBN to support ~
here)
(gdb) tar ext :1234
Remote debugging using :1234

Breakpoint 1, internal_error (
    file=0x8d5150 "../../binutils-gdb/gdb/thread.c", line=703,
    fmt=0x8d5130 "%s: Assertion `%s' failed.")
    at ../../binutils-gdb/gdb/common/errors.c:54

which is here:

static int
is_thread_state (ptid_t ptid, enum thread_state state)
{
  struct thread_info *tp;

  tp = find_thread_ptid (ptid);
=>gdb_assert (tp);
  return tp->state == state;
}

(top-gdb) bt
#0  internal_error (file=0x8d5150 "../../binutils-gdb/gdb/thread.c",
    line=703, fmt=0x8d5130 "%s: Assertion `%s' failed.")
    at ../../binutils-gdb/gdb/common/errors.c:54
#1  0x0000000000628c40 in is_thread_state (ptid=..., state=THREAD_EXITED)
    at ../../binutils-gdb/gdb/thread.c:703
#2  0x0000000000628cac in is_exited (ptid=...)
    at ../../binutils-gdb/gdb/thread.c:716
#3  0x000000000074d0f4 in has_stack_frames ()
    at ../../binutils-gdb/gdb/frame.c:1516
#4  0x000000000074d1db in deprecated_safe_get_selected_frame ()
    at ../../binutils-gdb/gdb/frame.c:1563
#5  0x0000000000740f43 in check_frame_language_change ()
    at ../../binutils-gdb/gdb/top.c:344
#6  0x00000000007412a3 in execute_command (p=0xd1317c "4", from_tty=1)
    at ../../binutils-gdb/gdb/top.c:485
#7  0x0000000000638988 in command_handler (command=0xd13170 "")
    at ../../binutils-gdb/gdb/event-top.c:432
#8  0x0000000000638f41 in command_line_handler (rl=0x17870f0 "") at
../../binutils-gdb/gdb/event-top.c:629
...

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