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Index: head/sys/amd64/cloudabi64/cloudabi64_sysvec.c
===================================================================
--- head/sys/amd64/cloudabi64/cloudabi64_sysvec.c
+++ head/sys/amd64/cloudabi64/cloudabi64_sysvec.c
@@ -199,7 +199,8 @@
.sv_coredump = elf64_coredump,
.sv_pagesize = PAGE_SIZE,
.sv_minuser = VM_MIN_ADDRESS,
- .sv_maxuser = VM_MAXUSER_ADDRESS,
+ /* Keep top page reserved to work around AMD Ryzen stability issues. */
+ .sv_maxuser = VM_MAXUSER_ADDRESS - PAGE_SIZE,
.sv_stackprot = VM_PROT_READ | VM_PROT_WRITE,
.sv_copyout_strings = cloudabi64_copyout_strings,
.sv_setregs = cloudabi64_proc_setregs,

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