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diff --git a/sys/kern/subr_epoch.c b/sys/kern/subr_epoch.c
--- a/sys/kern/subr_epoch.c
+++ b/sys/kern/subr_epoch.c
@@ -468,9 +468,7 @@
MPASS(cold || epoch != NULL);
td = curthread;
- MPASS((vm_offset_t)et >= td->td_kstack &&
- (vm_offset_t)et + sizeof(struct epoch_tracker) <=
- td->td_kstack + td->td_kstack_pages * PAGE_SIZE);
+ MPASS(kstack_contains(td, (vm_offset_t)et, sizeof(*et)));
INIT_CHECK(epoch);
MPASS(epoch->e_flags & EPOCH_PREEMPT);

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