It's the insmod01_sh test from commands test suite that taints the kernel:
glameow kernel: [271396.718171] ltp_insmod01: loading out-of-tree module taints kernel. glameow kernel: [271396.718175] ltp_insmod01: module license 'unspecified' taints kernel. glameow kernel: [271396.718176] Disabling lock debugging due to kernel taint glameow kernel: [271396.718238] ltp_insmod01: module verification failed: signature and/or required key missing - tainting kernel
It's the insmod01_sh test from commands test suite that taints the kernel:
glameow kernel: [271396.718171] ltp_insmod01: loading out-of-tree module taints kernel.
glameow kernel: [271396.718175] ltp_insmod01: module license 'unspecified' taints kernel.
glameow kernel: [271396.718176] Disabling lock debugging due to kernel taint
glameow kernel: [271396.718238] ltp_insmod01: module verification failed: signature and/or required key missing - tainting kernel