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s390/pfault: add sanity check
If the task that was found on an initial interrupt doesn't match the current task execute a WARN_ON_ONCE() and don't put the task to sleep. When this happened something went wrong between the interface of the hypervisor and the kernel. In such a case keep the tasks alive to avoid a hanging system. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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1 changed files with 3 additions and 0 deletions
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@ -584,6 +584,8 @@ static void pfault_interrupt(struct ext_code ext_code,
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}
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} else {
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/* signal bit not set -> a real page is missing. */
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if (WARN_ON_ONCE(tsk != current))
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goto out;
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if (tsk->thread.pfault_wait == 1) {
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/* Already on the list with a reference: put to sleep */
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__set_task_state(tsk, TASK_UNINTERRUPTIBLE);
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@ -606,6 +608,7 @@ static void pfault_interrupt(struct ext_code ext_code,
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set_tsk_need_resched(tsk);
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}
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}
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out:
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spin_unlock(&pfault_lock);
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put_task_struct(tsk);
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}
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