[Bug 259218] Fatal trap 12: page fault while in kernel mode

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259218

--- Comment #14 from Konstantin Belousov <kib@FreeBSD.org> ---
Try this please
diff --git a/sys/dev/random/nehemiah.c b/sys/dev/random/nehemiah.c
index ba0dfb200ba0..3ad18005c935 100644
--- a/sys/dev/random/nehemiah.c
+++ b/sys/dev/random/nehemiah.c
@@ -68,7 +68,7 @@ VIA_RNG_store(void *buf)
 #ifdef __GNUCLIKE_ASM
        __asm __volatile(
                "movl   $0,%%edx\n\t"
-               "xstore"
+               ".byte 0x0f, 0xa7, 0xc0"
                        : "=a" (retval), "+d" (rate), "+D" (buf)
                        :
                        : "memory"

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