git: 6bb3f208617b - main - ktrace: do not enqueue request if the process' ktrioparams are freed

The branch main has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=6bb3f208617b58a54e2204eb31bae3f9a86117a7

commit 6bb3f208617b58a54e2204eb31bae3f9a86117a7
Author:     Konstantin Belousov <kib@FreeBSD.org>
AuthorDate: 2026-01-20 15:01:08 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2026-01-20 19:44:54 +0000

    ktrace: do not enqueue request if the process' ktrioparams are freed
    
    The p_ktrioparms are freed on termination of tracing.  Any ktr requests
    added to the queue after that would hang there and leak on the struct
    proc recycling, or trigger an assert in the process destructor for debug
    builds.
    
    Reported and tested by: pho
    Reviewed by:    markj
    Sponsored by:   The FreeBSD Foundation
    MFC after:      1 week
    Differential revision:  https://reviews.freebsd.org/D54804
---
 sys/kern/kern_ktrace.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/sys/kern/kern_ktrace.c b/sys/kern/kern_ktrace.c
index 15a8a4ab4fa4..b58e69a3f38e 100644
--- a/sys/kern/kern_ktrace.c
+++ b/sys/kern/kern_ktrace.c
@@ -373,11 +373,17 @@ ktr_getrequest(int type)
 static void
 ktr_enqueuerequest(struct thread *td, struct ktr_request *req)
 {
+	bool sched_ast;
 
 	mtx_lock(&ktrace_mtx);
-	STAILQ_INSERT_TAIL(&td->td_proc->p_ktr, req, ktr_list);
+	sched_ast = td->td_proc->p_ktrioparms != NULL;
+	if (sched_ast)
+		STAILQ_INSERT_TAIL(&td->td_proc->p_ktr, req, ktr_list);
+	else
+		ktr_freerequest_locked(req);
 	mtx_unlock(&ktrace_mtx);
-	ast_sched(td, TDA_KTRACE);
+	if (sched_ast)
+		ast_sched(td, TDA_KTRACE);
 }
 
 /*