From: David Howells <dhowells@redhat.com>
To: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
Cc: dhowells@redhat.com, Jakub Kicinski <kuba@kernel.org>,
syzbot <syzbot+f527b971b4bdc8e79f9e@syzkaller.appspotmail.com>,
bpf@vger.kernel.org, brauner@kernel.org, davem@davemloft.net,
dsahern@kernel.org, edumazet@google.com,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
netdev@vger.kernel.org, pabeni@redhat.com,
syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk
Subject: Re: Endless loop in udp with MSG_SPLICE_READ - Re: [syzbot] [fs?] INFO: task hung in pipe_release (4)
Date: Tue, 01 Aug 2023 15:02:57 +0100 [thread overview]
Message-ID: <1403312.1690898577@warthog.procyon.org.uk> (raw)
In-Reply-To: <64c903b02b234_1b307829418@willemb.c.googlers.com.notmuch>
Willem de Bruijn <willemdebruijn.kernel@gmail.com> wrote:
> What causes the infinite loop: does skb_splice_from_iter return 0 and
> therefore the loop neither decrements copy, nor breaks out with error?
Yeah. skb_splice_from_iter() starts returning 0 because the iterator is
empty, but it's still being asked to copy data. Possibly it should break out
of the loop (or give an error) in such a case.
David
next prev parent reply other threads:[~2023-08-01 14:04 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-12 7:35 [syzbot] [fs?] INFO: task hung in pipe_release (4) syzbot
2023-07-12 18:54 ` syzbot
2023-07-18 23:07 ` Jakub Kicinski
2023-07-24 13:17 ` David Howells
2023-07-28 23:52 ` David Howells
2023-07-29 15:27 ` David Howells
2023-07-29 21:49 ` Endless loop in udp with MSG_SPLICE_READ - " David Howells
2023-07-30 13:35 ` Willem de Bruijn
2023-07-30 14:30 ` Willem de Bruijn
2023-07-30 17:32 ` David Howells
2023-07-31 8:13 ` David Howells
2023-07-31 12:45 ` Willem de Bruijn
2023-07-31 13:34 ` David Howells
2023-08-01 12:40 ` David Howells
2023-08-01 12:58 ` Willem de Bruijn
2023-08-01 13:08 ` Willem de Bruijn
2023-08-01 14:01 ` David Howells
2023-08-01 14:02 ` David Howells [this message]
2023-08-01 14:19 ` David Howells
2023-08-01 14:31 ` Willem de Bruijn
2023-08-01 14:47 ` David Howells
2023-08-01 14:59 ` Willem de Bruijn
2023-08-02 13:21 ` David Howells
2023-08-02 16:48 ` syzbot
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