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scx: rq should be locked when calling scx_ops_exit_task() from scx_cancel_fork() #127

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Jan 23, 2024
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scx: rq should be locked when calling scx_ops_exit_task() from scx_cancel_fork() #127

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5 changes: 5 additions & 0 deletions kernel/sched/ext.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2524,8 +2524,13 @@ void scx_post_fork(struct task_struct *p)
void scx_cancel_fork(struct task_struct *p)
{
if (scx_enabled()) {
struct rq *rq;
struct rq_flags rf;

rq = task_rq_lock(p, &rf);
WARN_ON_ONCE(scx_get_task_state(p) >= SCX_TASK_READY);
scx_ops_exit_task(p);
task_rq_unlock(rq, p, &rf);
}
percpu_up_read(&scx_fork_rwsem);
}
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