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FROM: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-5.10.y&id=c85c6fadbef0a3eab41540ea628fa8fe8928c820
Try: Fix sched_fork() access an invalid sched_task_group
--- patch-5.10-ck1 2021-11-21 15:28:49.188267764 +0800
+++ patch-5.10.80-ck1 2021-11-21 15:57:02.448246461 +0800
@@ -3455,7 +3455,7 @@
index 000000000000..9478e2d473b7
--- /dev/null
+++ b/kernel/sched/MuQSS.c
-@@ -0,0 +1,7866 @@
+@@ -0,0 +1,7868 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * kernel/sched/MuQSS.c, was kernel/sched.c
@@ -5714,8 +5714,6 @@
+ */
+int sched_fork(unsigned long __maybe_unused clone_flags, struct task_struct *p)
+{
-+ unsigned long flags;
-+
+#ifdef CONFIG_PREEMPT_NOTIFIERS
+ INIT_HLIST_HEAD(&p->preempt_notifiers);
+#endif
@@ -5772,14 +5770,6 @@
+ p->sched_reset_on_fork = 0;
+ }
+
-+ /*
-+ * Silence PROVE_RCU.
-+ */
-+ raw_spin_lock_irqsave(&p->pi_lock, flags);
-+ rseq_migrate(p);
-+ set_task_cpu(p, smp_processor_id());
-+ raw_spin_unlock_irqrestore(&p->pi_lock, flags);
-+
+#ifdef CONFIG_SCHED_INFO
+ if (unlikely(sched_info_on()))
+ memset(&p->sched_info, 0, sizeof(p->sched_info));
@@ -5789,8 +5779,20 @@
+ return 0;
+}
+
-+void sched_post_fork(struct task_struct *p)
++void sched_post_fork(struct task_struct *p, struct kernel_clone_args *kargs)
+{
++ unsigned long flags;
++ /*
++ * Silence PROVE_RCU.
++ */
++ raw_spin_lock_irqsave(&p->pi_lock, flags);
++ rseq_migrate(p);
++ /*
++ * We're setting the CPU for the first time, we don't migrate,
++ * so use set_task_cpu().
++ */
++ set_task_cpu(p, smp_processor_id());
++ raw_spin_unlock_irqrestore(&p->pi_lock, flags);
+}
+
+#ifdef CONFIG_SCHEDSTATS
|