linux-kernel - Re: [syzbot] [crypto?] possible deadlock in padata_do

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Message-ID: <e7958eb8-05f8-48a7-ae71-bc15af6abcf2@I-love.SAKURA.ne.jp>
Date: Mon, 3 Nov 2025 23:24:33 +0900
From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To: syzbot <syzbot+bd936ccd4339cea66e6b@...kaller.appspotmail.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [syzbot] [crypto?] possible deadlock in padata_do_serial

#syz test

diff --git a/kernel/padata.c b/kernel/padata.c
index f4def028c48c..d2dce316e607 100644
--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -253,7 +253,7 @@ static struct padata_priv *padata_find_next(struct parallel_data *pd, int cpu,
 
 	reorder = per_cpu_ptr(pd->reorder_list, cpu);
 
-	spin_lock(&reorder->lock);
+	spin_lock_nested(&reorder->lock, 1);
 	if (list_empty(&reorder->list))
 		goto notfound;