git: 1f6db7d73474 - stable/15 - swap_release_by_cred*(): give some additional info on panics due to underflow

The branch stable/15 has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=1f6db7d73474a823723473a88e5af0917f93f2e9

commit 1f6db7d73474a823723473a88e5af0917f93f2e9
Author:     Konstantin Belousov <kib@FreeBSD.org>
AuthorDate: 2026-01-02 09:31:54 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2026-01-24 00:26:45 +0000

    swap_release_by_cred*(): give some additional info on panics due to underflow
    
    (cherry picked from commit 7361727d4584b5e303183c836497ae2754ce0e53)
---
 sys/vm/swap_pager.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/sys/vm/swap_pager.c b/sys/vm/swap_pager.c
index ab95bde34ceb..e0bdca07ff0f 100644
--- a/sys/vm/swap_pager.c
+++ b/sys/vm/swap_pager.c
@@ -239,7 +239,8 @@ swap_release_by_cred_rlimit(u_long pdecr, struct ucred *cred)
 #ifdef INVARIANTS
 	prev = atomic_fetchadd_long(&uip->ui_vmsize, -pdecr);
 	KASSERT(prev >= pdecr,
-	    ("negative vmsize for uid %d\n", uip->ui_uid));
+	    ("negative vmsize for uid %d, prev %#jx decr %#jx\n",
+	    uip->ui_uid, (uintmax_t)prev, (uintmax_t)pdecr));
 #else
 	atomic_subtract_long(&uip->ui_vmsize, pdecr);
 #endif
@@ -373,7 +374,8 @@ swap_release_by_cred(vm_ooffset_t decr, struct ucred *cred)
 	pdecr = atop(decr);
 #ifdef INVARIANTS
 	prev = atomic_fetchadd_long(&swap_reserved, -pdecr);
-	KASSERT(prev >= pdecr, ("swap_reserved < decr"));
+	KASSERT(prev >= pdecr, ("swap_reserved %#jx < decr %#jx",
+	    (uintmax_t)prev, (uintmax_t)pdecr));
 #else
 	atomic_subtract_long(&swap_reserved, pdecr);
 #endif