Reg : gdb crash is seen while attaching a process to gdb.

[RAJESH DASARI <raajeshdasari at gmail dot com>]

Hi ,

I am experiencing a gdb crash when i am trying to attach and dettach a
process(this process is a multi threaded application) to gdb on my
mips64 based linux environment.

ps -L -p 7889 | wc -l
15


# gdb -p 7889
GNU gdb (GDB) 7.12.1
Copyright (C) 2017 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "mips64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
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For help, type "help".
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Attaching to process 7889
[New LWP 7895]
[New LWP 7896]
Couldn't write debug register: No such process.
(gdb) quit
A debugging session is active.

    Inferior 1 [process 7889] will be detached.

Quit anyway? (y or n) y
gdb-7.12.1/gdb/thread.c:1010: internal-error: int
is_executing(ptid_t): Assertion `tp' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) y

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

gdb-7.12.1/gdb/thread.c:1010: internal-error: int
is_executing(ptid_t): Assertion `tp' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Create a core file of GDB? (y or n) y
Aborted (core dumped)


I notice this problem only for some processes, there are few more
multi-threaded processes which are not showing this problem. Could you
please share some pointers on what could be causing this gdb crash.



Thanks,
Rajesh Dasari.