我在一个c++开源程序中得到了一个sigkill信号。但是gdb确实告诉了谁发送了这个信号以及为什么。有人能让我知道如何在gdb中继续这种情况吗？或者它将是裸露的源代码分析，需要找到根本原因

/home/ubuntu#gdb -p  `pidof e2`
GNU gdb (Ubuntu 9.2-0ubuntu1~20.04.1) 9.2
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Attaching to process 2545141
[New LWP 2545201]
[New LWP 2545202]
[New LWP 2545203]
[New LWP 2545204]
[New LWP 2545205]
[New LWP 2545209]
[New LWP 2545210]
[New LWP 2545211]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

warning: Target and debugger are in different PID namespaces; thread lists and other data are likely unreliable.  Connect to gdbserver inside the container.
__pthread_clockjoin_ex (threadid=139679156389632, thread_return=0x0, clockid=<optimized out>, abstime=<optimized out>, block=<optimized out>) at pthread_join_common.c:145
145 pthread_join_common.c: No such file or directory.
(gdb) n
[Thread 0x7f09957fa700 (LWP 2545211) exited]
[Thread 0x7f0995ffb700 (LWP 2545210) exited]
[Thread 0x7f09967fc700 (LWP 2545209) exited]
[Thread 0x7f09977fe700 (LWP 2545204) exited]
[Thread 0x7f099d5bc700 (LWP 2545201) exited]
[Thread 0x7f099d5d4740 (LWP 2545141) exited]
[Thread 0x7f0996ffd700 (LWP 2545205) exited]
[Thread 0x7f099cdbb700 (LWP 2545202) exited]

Program terminated with signal SIGKILL, Killed.
The program no longer exists.
(gdb) info signals
Signal        Stop  Print   Pass to program Description

SIGHUP        Yes   Yes Yes     Hangup
SIGINT        Yes   Yes No      Interrupt
SIGKILL       Yes   Yes Yes     Killed