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-rw-r--r--sys/kern/kern_fork.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/sys/kern/kern_fork.c b/sys/kern/kern_fork.c
index 8907ed0..f516b3b 100644
--- a/sys/kern/kern_fork.c
+++ b/sys/kern/kern_fork.c
@@ -471,9 +471,13 @@ again:
ke2 = FIRST_KSE_IN_KSEGRP(kg2);
/* Allocate and switch to an alternate kstack if specified. */
- if (pages != 0)
+ if (pages != 0) {
+ mtx_lock(&Giant);
vm_thread_new_altkstack(td2, pages);
+ mtx_unlock(&Giant);
+ }
+ mtx_lock(&Giant); /* XXX: for VREF() */
PROC_LOCK(p2);
PROC_LOCK(p1);
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