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-rw-r--r--sys/kern/kern_synch.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/sys/kern/kern_synch.c b/sys/kern/kern_synch.c
index 7016307..0cb0282 100644
--- a/sys/kern/kern_synch.c
+++ b/sys/kern/kern_synch.c
@@ -297,11 +297,12 @@ mi_switch(int flags, struct thread *newtd)
mtx_assert(&Giant, MA_NOTOWNED);
#endif
KASSERT(td->td_critnest == 1 || (td->td_critnest == 2 &&
- (td->td_flags & TDF_OWEPREEMPT) != 0 && (flags & SW_INVOL) != 0 &&
+ (td->td_pflags & TDP_OWEPREEMPT) != 0 && (flags & SW_INVOL) != 0 &&
newtd == NULL),
("mi_switch: switch in a critical section"));
KASSERT((flags & (SW_INVOL | SW_VOL)) != 0,
("mi_switch: switch must be voluntary or involuntary"));
+ KASSERT(newtd != curthread, ("mi_switch: preempting back to ourself"));
if (flags & SW_VOL)
p->p_stats->p_ru.ru_nvcsw++;
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