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workqueue: Warn when a rescuer could not be created

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Rescuers are created when a workqueue with WQ_MEM_RECLAIM is allocated.
It typically happens during the system boot.

systemd switches the root filesystem from initrd to the booted system
during boot. It kills processes that block the switch for too long.
One of the process might be modprobe that tries to create a workqueue.

These problems are hard to reproduce. Also alloc_workqueue() does not
pass the error code. Make the debugging easier by printing an error,
similar to create_worker().

Signed-off-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Petr Mladek 2023-03-07 13:53:34 +01:00 committed by Tejun Heo
parent 60f540389a
commit 4c0736a76a
1 changed files with 6 additions and 1 deletions
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7
kernel/workqueue.c
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@ -4391,13 +4391,18 @@ static int init_rescuer(struct workqueue_struct *wq)
return 0;
rescuer = alloc_worker(NUMA_NO_NODE);
if (!rescuer)
if (!rescuer) {
pr_err("workqueue: Failed to allocate a rescuer for wq \"%s\"\n",
wq->name);
return -ENOMEM;
}
rescuer->rescue_wq = wq;
rescuer->task = kthread_create(rescuer_thread, rescuer, "%s", wq->name);
if (IS_ERR(rescuer->task)) {
ret = PTR_ERR(rescuer->task);
pr_err("workqueue: Failed to create a rescuer kthread for wq \"%s\": %pe",
wq->name, ERR_PTR(ret));
kfree(rescuer);
return ret;
}