The exploit freezes at a certain stage

[WebMeisterX]

./exploit 
[*] creating user namespace (CLONE_NEWUSER)...
[*] creating network namespace (CLONE_NEWNET)...
[*] setting up UID namespace...
[*] configuring localhost in namespace...
[*] setting up nftables...
[+] running normal privesc
[*] waiting for the calm before the storm...
[*] sending double free buffer packet...
[*] spraying 16000 pte's...

Hello. At this stage, the exploit stops, and then the system crashes. what could it be? Ubuntu kernel version 6.1

[Gfquetnvl32]

./exploit
[*] creating user namespace (CLONE_NEWUSER)...

At this stage, the exploit stops
CentOS Linux release 8.5.2111

[Dusker-YJ]

In the 6.2 kernel version, the exploitation stops the same, the system crashes, or sometimes the exploitation succeeds normally. Why is that?