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Index: sys/kern/subr_blist.c
===================================================================
--- sys/kern/subr_blist.c
+++ sys/kern/subr_blist.c
@@ -764,6 +764,8 @@
/* Discard any candidates that appear before cursor. */
digit = (cursor / radix) & BLIST_META_MASK;
mask &= (u_daddr_t)-1 << digit;
+ if (mask == 0)
+ return (SWAPBLK_NONE);
/*
* If the first try is for a block that includes the cursor, pre-undo

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