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Subject: [Bug 224479] kernel panic in reboot+swapoff sys call
Date: Sun, 24 Dec 2017 00:28:31 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D224479

--- Comment #7 from Doug Moore <dougm@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 >=3D sp->sw_first && blk < sp->sw_end) {
+                       MPASS(blk + npages <=3D sp->sw_end);
                        sp->sw_used -=3D npages;
                        /*

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