Hello, reading through the compiler warnings I believe there is a potential issue in /usr/src/sys/kern/kern_ktrace.c At first glance it appears to free an uninitialized pointer memp.
Regards int ktruser(struct proc *p, const char *id, const void *addr, size_t len) { struct ktr_header kth; struct ktr_user ktp; int error; //uninitalized void *memp; #define STK_PARAMS 128 long long stkbuf[STK_PARAMS / sizeof(long long)]; if (!KTRPOINT(p, KTR_USER)) return (0); if (len > KTR_USER_MAXLEN) return (EINVAL); atomic_setbits_int(&p->p_flag, P_INKTR); ktrinitheader(&kth, p, KTR_USER); memset(ktp.ktr_id, 0, KTR_USER_MAXIDLEN); error = copyinstr(id, ktp.ktr_id, KTR_USER_MAXIDLEN, NULL); //if error then skip setting memp if (error) goto out; if (len > sizeof(stkbuf)) memp = malloc(len, M_TEMP, M_WAITOK); else memp = stkbuf; error = copyin(addr, memp, len); if (error) goto out; ktrwrite2(p, &kth, &ktp, sizeof(ktp), memp, len); out: // frees the uninitialized pointer if (memp != stkbuf) free(memp, M_TEMP, len);