rtpengine and rtpengine-recording are stuck and cannot be killed, which may even cause the server to freeze completely.

[Young-LLL-6130]

rtpengine version the issue has been seen with

Version: 13.5.1.25+0~mr13.5.1.25

Used distribution and its version

No response

Linux kernel version used

6.1.0-38-amd64

CPU architecture issue was seen on (see uname -m)

None

Expected behaviour you didn't see

No response

Unexpected behaviour you saw

Both rtpengine and rtpengine-recording are stuck in an unkillable state, which can eventually cause the entire server to freeze. Furthermore, there are no useful logs available after restarting the processes or rebooting the server.

Steps to reproduce the problem

No response

Additional program output to the terminal or logs illustrating the issue

Anything else?

#2150
some situation which has log in kern.log

[Young-LLL-6130]

rtpengine stuck without stack today:

`
tpengi+ 1975872 45.0 0.9 2066240 444780 ? SLsl 05:30 151:56 /usr/bin/rtpengine-recording -f --no-log-timestamps --pidfile /run/rtpengine-recording/ngcp-rtpengine-recording-daemon.pid --config-file /etc/rtpengine/rtpengine-recording.conf
rtpengi+ 1975927 38.9 2.8 10059164 1400244 ? tLsl 05:30 131:27 /usr/bin/rtpengine -f --no-log-timestamps --pidfile /run/rtpengine/ngcp-rtpengine-daemon.pid --config-file /etc/rtpengine/rtpengine.conf
root 2253686 0.2 0.0 5500 932 pts/3 T 10:22 0:05 tail -f /app/rtplog/rtpengine.log
root 2298158 0.0 0.0 6340 2160 pts/3 S+ 11:07 0:00 grep rtp
root@ecs-fs-002:#
root@ecs-fs-002:#
root@ecs-fs-002:~# gdb attach 1975927
GNU gdb (Debian 13.1-3) 13.1
Copyright (C) 2023 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
https://www.gnu.org/software/gdb/bugs/.
Find the GDB manual and other documentation resources online at:
http://www.gnu.org/software/gdb/documentation/.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
attach: No such file or directory.
Attaching to process 1975927
warning: process 1975927 is already traced by process 2295408
ptrace: Operation not permitted.
/root/1975927: No such file or directory.
(gdb) set pagination off
(gdb) set logging file /tmp/backtrace123.log
(gdb) set logging on
Warning: 'set logging on', an alias for the command 'set logging enabled', is deprecated.
Use 'set logging enabled on'.

Copying output to /tmp/backtrace123.log.
Copying debug output to /tmp/backtrace123.log.
(gdb) bt
No stack.
(gdb) bt full
No stack.
(gdb) quit
`

[Young-LLL-6130]

CPU

[Young-LLL-6130]

some thread info:

== /proc/292978/task/292991 0
== /proc/292978/task/292992 0
== /proc/292978/task/292993 0
== /proc/292978/task/292994 0
== /proc/292978/task/292995 0
[<0>] del_stream.part.0+0x161/0x230 [xt_RTPENGINE]
[<0>] del_call+0x8a/0x220 [xt_RTPENGINE]
[<0>] proc_control_read_write+0x1316/0x20f0 [xt_RTPENGINE]
[<0>] proc_reg_write+0x56/0xa0
[<0>] vfs_write+0xc4/0x3f0
[<0>] ksys_write+0xb7/0xf0
[<0>] do_syscall_64+0x5d/0xb0
[<0>] entry_SYSCALL_64_after_hwframe+0x6e/0xd8
== /proc/292978/task/292996 0
[<0>] del_stream.part.0+0x161/0x230 [xt_RTPENGINE]
[<0>] del_call+0x8a/0x220 [xt_RTPENGINE]
[<0>] proc_control_read_write+0x1316/0x20f0 [xt_RTPENGINE]
[<0>] proc_reg_write+0x56/0xa0
[<0>] vfs_write+0xc4/0x3f0
[<0>] ksys_write+0xb7/0xf0
[<0>] do_syscall_64+0x5d/0xb0
[<0>] entry_SYSCALL_64_after_hwframe+0x6e/0xd8
== /proc/292978/task/292997 0
== /proc/292978/task/292998 0
== /proc/292978/task/292999 0
== /proc/292978/task/293000 0
== /proc/292978/task/293001 0
== /proc/292978/task/293002 0
[<0>] del_stream.part.0+0x161/0x230 [xt_RTPENGINE]
[<0>] del_call+0x8a/0x220 [xt_RTPENGINE]
[<0>] proc_control_read_write+0x1316/0x20f0 [xt_RTPENGINE]
[<0>] proc_reg_write+0x56/0xa0
[<0>] vfs_write+0xc4/0x3f0
[<0>] ksys_write+0xb7/0xf0
[<0>] do_syscall_64+0x5d/0xb0
[<0>] entry_SYSCALL_64_after_hwframe+0x6e/0xd8