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diff --git a/sys/amd64/amd64/exception.S b/sys/amd64/amd64/exception.S
--- a/sys/amd64/amd64/exception.S
+++ b/sys/amd64/amd64/exception.S
@@ -524,7 +524,6 @@
SUPERALIGN_TEXT
IDTVEC(fast_syscall_pti)
swapgs
- lfence
cmpq $~0,PCPU(UCR3)
je fast_syscall_common
movq %rax,PCPU(SCRATCH_RAX)
@@ -535,7 +534,6 @@
SUPERALIGN_TEXT
IDTVEC(fast_syscall)
swapgs
- lfence
fast_syscall_common:
movq %rsp,PCPU(SCRATCH_RSP)
movq PCPU(RSP0),%rsp

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