一个追踪信号的内核模块，支持内核5.10+
A kernel module for tracing signal, support kernel 5.10+
# ls /sys/module/SignalTracer/parameters/
dump_kernel_stack match_from_uid match_sig match_target_uid
echo Y > /sys/module/SignalTracer/parameters/dump_kernel_stack
echo N > /sys/module/SignalTracer/parameters/dump_kernel_stack
-1 means no restrictions
# only print stacktrace when SIGKILL / 只打印 SIGKILL
echo 9 > /sys/module/SignalTracer/parameters/match_sig
# only print stacktrace when root kill someone / 只在 root 进程杀死其他进程的时候打印
echo 0 > /sys/module/SignalTracer/parameters/match_from_uid
# only print stacktrace when shell is killed / 只在 shell 进程被杀死的时候打印
echo 2000 > /sys/module/SignalTracer/parameters/match_target_uid
# With 3 restrictions above, only print when root kill -9 shell
# 有了上面的三个限制，只在 root 进程杀死 shell 进程的时候打印调用栈
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