linux-kernel - Re: [syzbot] [netfs?] WARNING in netfs_retry

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Message-ID: <674a4cff.050a0220.253251.00cf.GAE@google.com>
Date: Fri, 29 Nov 2024 15:23:43 -0800
From: syzbot <syzbot+fe139f9822abd9855970@...kaller.appspotmail.com>
To: hdanton@...a.com
Cc: hdanton@...a.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [netfs?] WARNING in netfs_retry_reads

> On Thu, Nov 28, 2024 at 11:27:24PM -0800, syzbot wrote:
>> syzbot found the following issue on:
>> 
>> HEAD commit:    85a2dd7d7c81 Add linux-next specific files for 20241125
>> git tree:       linux-next
>> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14e3a5c0580000
>
> #syz test

This bug is already marked as invalid. No point in testing.

>
> --- x/fs/netfs/read_collect.c
> +++ y/fs/netfs/read_collect.c
> @@ -619,8 +619,7 @@ ssize_t netfs_wait_for_read(struct netfs
>  
>  	for (;;) {
>  		trace_netfs_rreq(rreq, netfs_rreq_trace_wait_queue);
> -		prepare_to_wait(&rreq->waitq, &myself, TASK_UNINTERRUPTIBLE);
> -
> +		smp_mb();
>  		subreq = list_first_entry_or_null(&stream->subrequests,
>  						  struct netfs_io_subrequest, rreq_link);
>  		if (subreq &&
> @@ -628,6 +627,7 @@ ssize_t netfs_wait_for_read(struct netfs
>  		     test_bit(NETFS_SREQ_MADE_PROGRESS, &subreq->flags)))
>  			netfs_read_collection(rreq);
>  
> +		prepare_to_wait(&rreq->waitq, &myself, TASK_UNINTERRUPTIBLE);
>  		if (!test_bit(NETFS_RREQ_IN_PROGRESS, &rreq->flags))
>  			break;
>  
> --