linux-kernel - Re: [syzbot] [media?] INFO: task hung in cec_claim_log

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Date: Thu, 22 Feb 2024 12:58:15 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+116b65a23bc791ae49a6@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [media?] INFO: task hung in cec_claim_log_addrs

On Tue, 20 Feb 2024 22:13:24 -0800
> HEAD commit:    83d49ede4b18 Merge branch 'for-next/core' into for-kernelci
> git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11ddc734180000

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git  for-kernelci

--- x/drivers/media/cec/core/cec-adap.c
+++ y/drivers/media/cec/core/cec-adap.c
@@ -1592,8 +1592,6 @@ static void cec_claim_log_addrs(struct c
 	if (WARN_ON(adap->is_configuring || adap->is_configured))
 		return;
 
-	init_completion(&adap->config_completion);
-
 	/* Ready to kick off the thread */
 	adap->is_configuring = true;
 	adap->kthread_config = kthread_run(cec_config_thread_func, adap,
--- x/drivers/media/cec/core/cec-core.c
+++ y/drivers/media/cec/core/cec-core.c
@@ -284,6 +284,7 @@ struct cec_adapter *cec_allocate_adapter
 	mutex_init(&adap->lock);
 	INIT_LIST_HEAD(&adap->transmit_queue);
 	INIT_LIST_HEAD(&adap->wait_queue);
+	init_completion(&adap->config_completion);
 	init_waitqueue_head(&adap->kthread_waitq);
 
 	/* adap->devnode initialization */
--