linux-kernel - Re: [syzbot] [netfs?] INFO: task hung in netfs_unbuffered_write

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Message-ID: <791d5b5a-3204-41cf-8796-b26018824333@amd.com>
Date: Mon, 24 Mar 2025 01:20:47 +0530
From: K Prateek Nayak <kprateek.nayak@....com>
To: Oleg Nesterov <oleg@...hat.com>, syzbot
	<syzbot+62262fdc0e01d99573fc@...kaller.appspotmail.com>
CC: <brauner@...nel.org>, <dhowells@...hat.com>, <jack@...e.cz>,
	<jlayton@...nel.org>, <linux-fsdevel@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <mjguzik@...il.com>, <netfs@...ts.linux.dev>,
	<swapnil.sapkal@....com>, <syzkaller-bugs@...glegroups.com>,
	<viro@...iv.linux.org.uk>
Subject: Re: [syzbot] [netfs?] INFO: task hung in netfs_unbuffered_write_iter

Hello Oleg,

On 3/24/2025 1:17 AM, Oleg Nesterov wrote:
> On 03/23, syzbot wrote:
>>
>> Hello,
>>
>> syzbot has tested the proposed patch but the reproducer is still triggering an issue:
>> INFO: task hung in netfs_unbuffered_write_iter
> 
> OK, as expected.
> 
> Dear syzbot, thank you.
> 
> So far I think this is another problem revealed by aaec5a95d59615523db03dd5
> ("pipe_read: don't wake up the writer if the pipe is still full").
> 
> I am going to forget about this report for now and return to it later, when
> all the pending pipe-related changes in vfs.git are merged.

P.S. I'm trying to repro this on my machine on latest upstream. Haven't
gotten lucky yet with the C reproducer with my config. I'm moving to the
the syzbot's config to see if it reveals something. If I have something
I'll report back here.

> 
> Oleg.
> 

-- 
Thanks and Regards,
Prateek