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sched: Be more strict about p->is_blocked

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Upon entry to try_to_block_task(), p->is_blocked should be false. After all,
the prior wakeup would have made it so per ttwu_do_wakeup().

Ensure this is the case, rather than clearing it in the path that doesn't set
it.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: John Stultz <jstultz@google.com>
Link: https://patch.msgid.link/20260526113322.364017314%40infradead.org
This commit is contained in:
Peter Zijlstra 2026-05-26 11:32:34 +02:00
parent abc40cca0e
commit 708024b575
1 changed files with 2 additions and 1 deletions
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3
kernel/sched/core.c
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@ -6676,8 +6676,9 @@ static bool try_to_block_task(struct rq *rq, struct task_struct *p,
{
unsigned long task_state = *task_state_p;
WARN_ON_ONCE(p->is_blocked);
if (signal_pending_state(task_state, p)) {
p->is_blocked = 0;
WRITE_ONCE(p->__state, TASK_RUNNING);
*task_state_p = TASK_RUNNING;
clear_task_blocked_on(p, NULL);