The branch stable/15 has been updated by kib:
URL:
https://cgit.FreeBSD.org/src/commit/?id=7140a4790cbc6c897673276299a1bc3ad63dc3f8
commit 7140a4790cbc6c897673276299a1bc3ad63dc3f8
Author: Konstantin Belousov <k...@freebsd.org>
AuthorDate: 2025-09-08 03:43:09 +0000
Commit: Konstantin Belousov <k...@freebsd.org>
CommitDate: 2025-09-16 02:45:12 +0000
kern_thr_exit(): clear kASTs in advance
PR: 289204
(cherry picked from commit f51d7d5139a76d225c9f537bd948525ababdef0c)
---
sys/kern/kern_thr.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/sys/kern/kern_thr.c b/sys/kern/kern_thr.c
index 0e8c2b9f362e..4329959a2ef4 100644
--- a/sys/kern/kern_thr.c
+++ b/sys/kern/kern_thr.c
@@ -346,6 +346,17 @@ kern_thr_exit(struct thread *td)
p = td->td_proc;
+ /*
+ * Clear kernel ASTs in advance of selecting the last exiting
+ * thread and acquiring schedulers locks. It is fine to
+ * clear the ASTs here even if we are not going to exit after
+ * all. On the other hand, leaving them pending could trigger
+ * execution in subsystems in a context where they are not
+ * prepared to handle top kernel actions, even in execution of
+ * an unrelated thread.
+ */
+ ast_kclear(td);
+
/*
* If all of the threads in a process call this routine to
* exit (e.g. all threads call pthread_exit()), exactly one
