https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224479
--- Comment #7 from Doug Moore <do...@rice.edu> ---
I don't have the means to reproduce this bug. For someone who does (Peter?),
could you possibly add this assertion to the code and see if the conditions
that trigger the bug trigger the assertion first?
index 22bf6c72b8b..c026dadf8be 100644
--- a/sys/vm/swap_pager.c
+++ b/sys/vm/swap_pager.c
@@ -778,6 +778,7 @@ swp_pager_freeswapspace(daddr_t blk, daddr_t npages)
mtx_lock(&sw_dev_mtx);
TAILQ_FOREACH(sp, &swtailq, sw_list) {
if (blk >= sp->sw_first && blk < sp->sw_end) {
+ MPASS(blk + npages <= sp->sw_end);
sp->sw_used -= npages;
/*
--
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