In the Linux kernel, the following vulnerability has been resolved: bpf: Fix deadlock between rcutaskstrace and eventmutex. Fix the following deadlock: CPU A _freeevent() perfkprobedestroy() mutexlock(&eventmutex) perftraceeventunreg() synchronizercutaskstrace() There are several paths where freeevent() grabs eventmutex and calls syncrcutaskstrace. Above is one such case. CPU B bpfprogtestrunsyscall() rcureadlocktrace() bpfprogrunpinoncpu() bpfprogload() bpftracingfuncproto() tracesetclrevent() mutexlock(&eventmutex) Delegate tracesetclr_event() to workqueue to avoid such lock dependency.