This splat is a regression from 5.3.x series, and results in tainted kernel on every startup. Still happens with 5.4.2.
Dec 06 23:26:27 flap.local kernel: WARNING: CPU: 2 PID: 1 at kernel/trace/trace.c:8106 create_trace_option_files+0x1ef/0x220
Dec 06 23:26:27 flap.local kernel: Modules linked in:
Dec 06 23:26:27 flap.local kernel: CPU: 2 PID: 1 Comm: swapper/0 Tainted: G W 5.4.2-300.fc31.x86_64 #1
Dec 06 23:26:27 flap.local kernel: Hardware name: HP HP Spectre Notebook/81A0, BIOS F.43 04/16/2019
Dec 06 23:26:27 flap.local kernel: RIP: 0010:create_trace_option_files+0x1ef/0x220
Upstream is looking into it.
I'm not seeing it with 5.5.0-0.rc1.git0.1.fc32.x86_64+debug
This is still happening in 5.4.5-300.fc31.x86_64
Should be fixed by commit: a356646a56857c2e5ad875beec734d7145ecd49a ("tracing: Do not create directories if lockdown is in affect")
I'm not seeing it in linux-stable@ though