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Miller" , Sasha Levin Subject: [PATCH AUTOSEL for 4.9 242/281] sctp: fix recursive locking warning in sctp_do_peeloff Thread-Topic: [PATCH AUTOSEL for 4.9 242/281] sctp: fix recursive locking warning in sctp_do_peeloff Thread-Index: AQHTv5u1Dn3frs3A00S1Z2G6dwWzmA== Date: Mon, 19 Mar 2018 16:02:40 +0000 Message-ID: <20180319155742.13731-242-alexander.levin@microsoft.com> References: <20180319155742.13731-1-alexander.levin@microsoft.com> In-Reply-To: <20180319155742.13731-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR2101MB0727;7:XN15MIfbg8h1cpa3DrAQg5UmVdCC9f1znA4XyKgcInxCMBnQ2+TcMGSBUMnIo4mWO8ap3nhx1z7z2FR3Zxo9i9Yemu7GHlKIrCth09MKl0fQF8XwB1GTyK7ANCu4iHAxPbrD/ye6/PXqTQlDV0BTnCgSBObnVJ6ss3p7E8tR8/z2rb4k8jV9GX5QfuIIiXUwg4tIxjmSG3h+D4C09XUZXXAVzm4X2sQdfKGzZG9d3tQnniUPzwx+JgZtnalO/TNw;20:dDgaSXq1IMIOsjQk69YjR+9PUL3gzpDLak2JMbH3f+lxmdzgIKSV6oXZBfzuzZRCRO9zkjXREJrF/z5i/Bm0viaS56LlQXNJwxe2zK40BYtu0IAgkO9WT2CXo1MmRxYaSjgqScKfBkRiIFzj5fECPnXBGoORV75g52V2XIWrIm4= x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: fa869916-f99c-480f-a9d5-08d58db33b1c x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB0727; 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x-microsoft-antispam-message-info: WabPsxpqJWyAnS6oKfzRx+B3xu3iShHndGz2oTwTtjqydyII90Eq9UbQuZFnzgnVlQN6r9Obk9aPNo+pNK/J7hK2ZuPJaZzqvS1WeQQba8pZfJAM7Qk1eDkKSv8JQ4wvLnGhYvJWrPCcYfxYQ4X3/4jaljYJfwDF+vNBcOfsMBRQ5fJgKbS0sOjo85ehlb0mvYTdaQr3jxuUhBPuazs4h5oPJEvrazofwBo8OROdZBq74nEX7mcTrCaGw235Ns21LhGAIauJs0no2DczaHSgMoAkFl11qSxGUTkD5M7EvcleXnR/r+T3jRAlhN4E2ASJcQuCogNiOvEv/LSgzWcSYA== spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: fa869916-f99c-480f-a9d5-08d58db33b1c X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Mar 2018 16:02:41.0192 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB0727 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Xin Long [ Upstream commit 6dfe4b97e08ec3d1a593fdaca099f0ef0a3a19e6 ] Dmitry got the following recursive locking report while running syzkaller fuzzer, the Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x2ee/0x3ef lib/dump_stack.c:52 print_deadlock_bug kernel/locking/lockdep.c:1729 [inline] check_deadlock kernel/locking/lockdep.c:1773 [inline] validate_chain kernel/locking/lockdep.c:2251 [inline] __lock_acquire+0xef2/0x3430 kernel/locking/lockdep.c:3340 lock_acquire+0x2a1/0x630 kernel/locking/lockdep.c:3755 lock_sock_nested+0xcb/0x120 net/core/sock.c:2536 lock_sock include/net/sock.h:1460 [inline] sctp_close+0xcd/0x9d0 net/sctp/socket.c:1497 inet_release+0xed/0x1c0 net/ipv4/af_inet.c:425 inet6_release+0x50/0x70 net/ipv6/af_inet6.c:432 sock_release+0x8d/0x1e0 net/socket.c:597 __sock_create+0x38b/0x870 net/socket.c:1226 sock_create+0x7f/0xa0 net/socket.c:1237 sctp_do_peeloff+0x1a2/0x440 net/sctp/socket.c:4879 sctp_getsockopt_peeloff net/sctp/socket.c:4914 [inline] sctp_getsockopt+0x111a/0x67e0 net/sctp/socket.c:6628 sock_common_getsockopt+0x95/0xd0 net/core/sock.c:2690 SYSC_getsockopt net/socket.c:1817 [inline] SyS_getsockopt+0x240/0x380 net/socket.c:1799 entry_SYSCALL_64_fastpath+0x1f/0xc2 This warning is caused by the lock held by sctp_getsockopt() is on one socket, while the other lock that sctp_close() is getting later is on the newly created (which failed) socket during peeloff operation. This patch is to avoid this warning by use lock_sock with subclass SINGLE_DEPTH_NESTING as Wang Cong and Marcelo's suggestion. Reported-by: Dmitry Vyukov Suggested-by: Marcelo Ricardo Leitner Suggested-by: Cong Wang Signed-off-by: Xin Long Acked-by: Marcelo Ricardo Leitner Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- net/sctp/socket.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/sctp/socket.c b/net/sctp/socket.c index 8cdd6bbe2efa..172465b7c0f4 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -1519,7 +1519,7 @@ static void sctp_close(struct sock *sk, long timeout) =20 pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout); =20 - lock_sock(sk); + lock_sock_nested(sk, SINGLE_DEPTH_NESTING); sk->sk_shutdown =3D SHUTDOWN_MASK; sk->sk_state =3D SCTP_SS_CLOSING; =20 @@ -1569,7 +1569,7 @@ static void sctp_close(struct sock *sk, long timeout) * held and that should be grabbed before socket lock. */ spin_lock_bh(&net->sctp.addr_wq_lock); - bh_lock_sock(sk); + bh_lock_sock_nested(sk); =20 /* Hold the sock, since sk_common_release() will put sock_put() * and we have just a little more cleanup. --=20 2.14.1