From: David Howells <dhowells@redhat.com>
To: syzbot <syzbot+f527b971b4bdc8e79f9e@syzkaller.appspotmail.com>
Cc: dhowells@redhat.com, bpf@vger.kernel.org, brauner@kernel.org,
davem@davemloft.net, dsahern@kernel.org, edumazet@google.com,
kuba@kernel.org, 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: [syzbot] [fs?] INFO: task hung in pipe_release (4)
Date: Mon, 24 Jul 2023 14:17:07 +0100 [thread overview]
Message-ID: <145370.1690204627@warthog.procyon.org.uk> (raw)
In-Reply-To: <0000000000001416bb06004ebf53@google.com>
Note that the test program is dodgy:
pipe(&(0x7f0000000100)={<r0=>0xffffffffffffffff, <r1=>0xffffffffffffffff})
r2 = socket$inet_udp(0x2, 0x2, 0x0)
r2 is closed here:
close(r2)
r3 = socket$inet_udp(0x2, 0x2, 0x0)
setsockopt$sock_int(r3, 0x1, 0x6, &(0x7f0000000140)=0x32, 0x4)
bind$inet(r3, &(0x7f0000000000)={0x2, 0x0, @dev={0xac, 0x14, 0x14, 0x15}}, 0x10)
connect$inet(r3, &(0x7f0000000200)={0x2, 0x0, @broadcast}, 0x10)
sendmmsg(r3, &(0x7f0000000180)=[{{0x0, 0x0, 0x0}}, {{0x0, 0xfffffffffffffed3, &(0x7f0000000940)=[{&(0x7f00000006c0)='O', 0x57e}], 0x1}}], 0x4000000000003bd, 0x8800)
write$binfmt_misc(r1, &(0x7f0000000440)=ANY=[], 0x8)
but then used here:
splice(r0, 0x0, r2, 0x0, 0x4ffe0, 0x0)
As it happens, r3 will probably end up referring to the same fd as r2 did, but
that's not guaranteed.
David
next prev parent reply other threads:[~2023-07-24 13:18 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-12 7:35 syzbot
2023-07-12 18:54 ` syzbot
2023-07-18 23:07 ` Jakub Kicinski
2023-07-24 13:17 ` David Howells [this message]
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
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
[not found] <20230730005526.1064-1-hdanton@sina.com>
2023-07-30 1:18 ` syzbot
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